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138 results on '"Yue, Q‐Y"'

18. PLCE1 inhibits apoptosis of non-small cell lung cancer via promoting PTEN methylation.

Author

YUE, Q.-Y., ZHAO, W., TAN, Y., DENG, X.-L., and ZHANG, Y.-H.

Abstract

OBJECTIVE: To explore the role of phospholipase C epsilon 1 (PLCE1) in regulating cell apoptosis of non-small cell lung cancer (NSCLC) and its underlying mechanism. PATIENTS AND METHODS: The mRNA and protein levels of PLCE1 in NSCLC tissues, adjacent normal tissues and NSCLC cell lines (A549 and H1299) were detected by quantitative Real Time-Polymerase Chain Reaction (qRT-PCR) and Western blot, respectively. Methylation status in the promoter region of PTEN in NSCLC cells was accessed using the relative commercial kit. Cell apoptosis after transfection of PLCE1 siRNA in NSCLC cells was detected by flow cytometry. Protein expressions of apoptosis-related genes in NSCLC cells after altering PLCE1 expression were detected by Western blot. RESULTS: PLCE1 was highly expressed in NSCLC tissues and cell lines than that of controls. PLCE1 knockdown promoted PTEN expression and inhibited methylation in H1299 cells. Transfection of PLCE1 siRNA in NSCLC cells remarkably induced cell apoptosis. CONCLUSIONS: PLCE1 inhibits cell apoptosis of NSCLC by promoting PTEN methylation. [ABSTRACT FROM AUTHOR]

Published
2019

19. Effects of Linc00460 on cell migration and invasion through regulating epithelial-mesenchymal transition (EMT) in non-small cell lung cancer.

Author

YUE, Q.-Y. and ZHANG, Y.

Abstract

OBJECTIVE: To detect the relative expression of long intergenic non-protein coding RNA 460 (linc00460) in non-small cell lung cancer (NSCLC) tissues and cells, to investigate the effects of linc00460 on proliferation, migration and invasion of NSCLC and to preliminarily explore its potential molecular action mechanisms. PATIENTS AND METHODS: The relative expression of cancer tissues from 52 patients with NSCLC compared with that of para-carcinoma normal tissues was detected through Real-time quantitative polymerase chain reaction (qRTPCR). qRT-PCR was also used to test the relative expressions of linc00460 in 4 strains of NSCLC cells. Effects of knockdown of linc00460 expression on the cell proliferation ability were detected by cell counting kit-8 (CCK-8) assay through transfection of small interfering linc00460 (silinc00460) interference sequence in A549 cells and PC-9 cells. Transwell assay was used to detect the effects of lic00460 on the migration and invasion abilities of NSCLC cells. Western blot was applied to observe the changes of epithelial- mesenchymal transition (EMT)-related proteins. The expression changes of EMT-related proteins were detected by immunofluorescence assay. RESULTS: qRT-PCR results showed that there were 40 cases (76.9%) with up-regulated linc00460 expressions in tissues from 52 patients with NSCLC. The linc00460 expressions in 5 strains of NSCLC cells were higher than those of human bronchial epithelial (16HBE) cells. Interference in linc00460 expression could inhibit the proliferation, invasion and migration of NSCLC cells. Results of Western blot and immunofluorescence found that interfering with the linc00460 expression could affect the expression changes of EMT-related proteins. CONCLUSIONS: The relative expression of linc00460 is upregulated in NSCLC tissues. Cells and linc00460 can promote the tumor invasion and migration through affecting EMT. [ABSTRACT FROM AUTHOR]

Published
2018

20. Phenotype Standardization of Angioedema in the Head and Neck Region Caused by Agents Acting on the Angiotensin System

Author

Wadelius, M., Marshall, S. E., Islander, G., Nordang, L., Karawajczyk, M., Yue, Q. Y., Terreehorst, I., Baranova, E. V., Hugosson, S., Sköldefors, K., Pirmohamed, M., Maitland-van der Zee, A. H., Alfirevic, A., Hallberg, P., Palmer, C. N A, Wadelius, M., Marshall, S. E., Islander, G., Nordang, L., Karawajczyk, M., Yue, Q. Y., Terreehorst, I., Baranova, E. V., Hugosson, S., Sköldefors, K., Pirmohamed, M., Maitland-van der Zee, A. H., Alfirevic, A., Hallberg, P., and Palmer, C. N A

Abstract

Angioedema is a potentially life-threatening adverse reaction to angiotensin-converting enzyme inhibitors and angiotensin receptor blockers. To study the genetic etiology of this rare adverse event, international consortia and multicenter recruitment of patients are needed. To reduce patient heterogeneity, we have standardized the phenotype. In brief, it comprises swelling in the head and neck region that first occurs during treatment. It should not coincide with urticaria or have another likely cause such as hereditary angioedema.Clinical Pharmacology & Therapeutics (2014); advance online publication 13 August 2014. doi:10.1038/clpt.2014.138.

Published
2014

21. Phenotype Standardization for Statin-Induced Myotoxicity

Author

Alfirevic, A., Neely, D., Armitage, J., Chinoy, H., Cooper, R. G., Laaksonen, R., Carr, D. F., Bloch, K. M., Fahy, J., Hanson, A., Yue, Q. Y., Wadelius, M., Maitland-van Der Zee, A. H., Voora, D., Psaty, B. M., Palmer, C. N A, Pirmohamed, M., Alfirevic, A., Neely, D., Armitage, J., Chinoy, H., Cooper, R. G., Laaksonen, R., Carr, D. F., Bloch, K. M., Fahy, J., Hanson, A., Yue, Q. Y., Wadelius, M., Maitland-van Der Zee, A. H., Voora, D., Psaty, B. M., Palmer, C. N A, and Pirmohamed, M.

Abstract

Statins are widely used lipid-lowering drugs that are effective in reducing cardiovascular disease risk. Although they are generally well tolerated, they can cause muscle toxicity, which can lead to severe rhabdomyolysis. Research in this area has been hampered to some extent by the lack of standardized nomenclature and phenotypic definitions. We have used numerical and descriptive classifications and developed an algorithm to define statin-related myotoxicity phenotypes, including myalgia, myopathy, rhabdomyolysis, and necrotizing autoimmune myopathy.Clinical Pharmacology and Therapeutics (2014); advance online publication 02 July 2014. doi:10.1038/clpt.2014.121.

Published
2014

22. Phenotype Standardization of Angioedema in the Head and Neck Region Caused by Agents Acting on the Angiotensin System

Author

Wadelius, Mia, Marshall, S. E., Islander, G., Nordang, Leif, Karawajczyk, Malgorzata, Yue, Q-Y, Terreehorst, I., Baranova, E. V., Hugosson, S., Skoldefors, K., Pirmohamed, M., Maitland-van der Zee, A-H, Alfirevic, A., Hallberg, Pär, Palmer, C. N. A., Wadelius, Mia, Marshall, S. E., Islander, G., Nordang, Leif, Karawajczyk, Malgorzata, Yue, Q-Y, Terreehorst, I., Baranova, E. V., Hugosson, S., Skoldefors, K., Pirmohamed, M., Maitland-van der Zee, A-H, Alfirevic, A., Hallberg, Pär, and Palmer, C. N. A.

Abstract

Angioedema is a potentially life-threatening adverse reaction to angiotensin-converting enzyme inhibitors and angiotensin receptor blockers. To study the genetic etiology of this rare adverse event, international consortia and multicenter recruitment of patients are needed. To reduce patient heterogeneity, we have standardized the phenotype. In brief, it comprises swelling in the head and neck region that first occurs during treatment. It should not coincide with urticaria or have another likely cause such as hereditary angioedema.

Published
2014
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23. Phenotype Standardization for Statin-Induced Myotoxicity

Author

Sub Pharmacotherapy, Theoretical, Pharmacoepidemiology and Clinical Pharmacology, Alfirevic, A., Neely, D., Armitage, J., Chinoy, H., Cooper, R. G., Laaksonen, R., Carr, D. F., Bloch, K. M., Fahy, J., Hanson, A., Yue, Q. Y., Wadelius, M., Maitland-van Der Zee, A. H., Voora, D., Psaty, B. M., Palmer, C. N A, Pirmohamed, M., Sub Pharmacotherapy, Theoretical, Pharmacoepidemiology and Clinical Pharmacology, Alfirevic, A., Neely, D., Armitage, J., Chinoy, H., Cooper, R. G., Laaksonen, R., Carr, D. F., Bloch, K. M., Fahy, J., Hanson, A., Yue, Q. Y., Wadelius, M., Maitland-van Der Zee, A. H., Voora, D., Psaty, B. M., Palmer, C. N A, and Pirmohamed, M.

Published
2014

24. Phenotype Standardization of Angioedema in the Head and Neck Region Caused by Agents Acting on the Angiotensin System

Author

Sub Pharmacotherapy, Theoretical, Pharmacoepidemiology and Clinical Pharmacology, Wadelius, M., Marshall, S. E., Islander, G., Nordang, L., Karawajczyk, M., Yue, Q. Y., Terreehorst, I., Baranova, E. V., Hugosson, S., Sköldefors, K., Pirmohamed, M., Maitland-van der Zee, A. H., Alfirevic, A., Hallberg, P., Palmer, C. N A, Sub Pharmacotherapy, Theoretical, Pharmacoepidemiology and Clinical Pharmacology, Wadelius, M., Marshall, S. E., Islander, G., Nordang, L., Karawajczyk, M., Yue, Q. Y., Terreehorst, I., Baranova, E. V., Hugosson, S., Sköldefors, K., Pirmohamed, M., Maitland-van der Zee, A. H., Alfirevic, A., Hallberg, P., and Palmer, C. N A

Published
2014

25. Safety of St John's wort (Hypericum perforatum)

Author

Jobst, K.A., McIntyre, M., St George, D., Whitelegg, M., De Smet, P.A.G.M., Touw, D.J., Wheatley, D., Yue, Q.-Y., Bergquist, C., Gerden, B., Nanomedicine & Drug Targeting, Biopharmaceuticals, Discovery, Design and Delivery (BDDD), Groningen Research Institute for Asthma and COPD (GRIAC), Critical care, Anesthesiology, Peri-operative and Emergency medicine (CAPE), and Medicinal Chemistry and Bioanalysis (MCB)

Subjects
drug safety, enzyme induction, cytochrome P450, letter, law.invention, law, Hypericum perforatum, Medicine, human, Medicinal plants, biology, Traditional medicine, business.industry, drug legislation, clinical trial, General Medicine, digoxin, biology.organism_classification, mass medium, drug metabolism, warfarin, drug efficacy, priority journal, phenprocoumon, depression, Phytotherapy, Hypericum, business, diet, neurotransmitter
Published
2000

38. Quinidine inhibition of debrisoquine S( )-4- and 7-hydroxylations in Chinese of different CYP2D6 genotypes

Author

Bertilsson, L, Meese, C O, Yue, Q Y, Dahl, M L, Ingelman-Sundberg, M, Johansson, I, Säwe, J, and Eichelbaum, M

Abstract

Pronounced differences in the CYP2D6 gene between Chinese and Caucasians have previously been described. There was a low frequency of detrimental mutations in the Chinese CYP2D6 gene causing the poor metabolizer (PM) phenotype. In contrast to Caucasians where the Xba 144 kb allele is almost always associated with the PM phenotype, Chinese with the 4444 kb RFLP pattern are extensive metabolizers (EM). In order to evaluate whether the debrisoquine hydroxylation seen in subjects with this haplotype is catalysed by a functionally similar enzyme to CYP2D6 or is catalysed by another type of P450 isozyme, product selectivity of the 4-hydroxylation was studied in 27 Chinese. The inhibition of CYP2D6 by quinidine was also investigated.

Published
1993

39. Genetic analysis of the Chinese cytochrome P4502D locus: characterization of variant CYP2D6 genes present in subjects with diminished capacity for debrisoquine hydroxylation.

Author

Johansson, I, Oscarson, M, Yue, Q Y, Bertilsson, L, Sjöqvist, F, and Ingelman-Sundberg, M

Abstract

Cytochrome P4502D6 (CYP2D6) catalyzes the oxidative metabolism of several clinically important classes of drugs. Many of these have lower metabolic clearance rates among Chinese, compared with Caucasians, and are prescribed at lower doses for Asian patients. We have now evaluated the molecular genetic basis for this interethnic difference in drug metabolism. The CYP2D loci from two Chinese subjects, one homozygous for the XbaI 44-kilobase haplotype and one homozygous for the XbaI 29-kilobase haplotype, were cloned and characterized. Sequence analysis revealed two variant CYP2D6 genes, CYP2D6Ch1 and CYP2D6Ch2, having mutations yielding two and eight amino acid substitutions, respectively. Exon 9 of the CYP2D6Ch2 gene contained a sequence of 49 bases originating from the pseudogene CYP2D7P. In addition, mutations in the 5' flanking region common to both CYP2D6Ch genes were found. To evaluate the origin of the detrimental mutation in the genes, parts of the 5' flanking regions were introduced into a Hep G2/simian virus 40 expression system with chloramphenicol acetyltransferase as a reporter gene, and transfected cells were analyzed for activity. The ability of the upstream regions to bind nuclear factors was also evaluated using gel-shift analysis. Furthermore, several chimeric constructs of the CYP2D6wt and CYP2D6Ch genes were made, inserted into pCMV2 vectors, and expressed in COS-1 cells. A part of the upstream region of base pairs -1407 to -1068 was found to constitute an enhancer element, but the CYP2D6Ch-specific mutations did not influence the chloramphenicol acetyltransferase activity in the expression system. In contrast, expression of the chimeric genes revealed that the detrimental mutation of the CYP2D6Ch genes was C188-->T, causing a Pro34-->Ser amino acid substitution in a region that is a highly conserved in cytochromes P450 belonging to gene families 1 and 2. This substitution caused expression of a more unstable gene product, as evident from comparison of the relative levels of CYP2D6 mRNA, CYP2D6 protein, and bufuralol 1'-hydroxylase activities in pCMV2-CYP2D6-transfected COS-1 cells. Allele-specific polymerase chain reaction analysis of genomic DNA from 90 Chinese individuals revealed that the CYP2D6Ch1 allele was the most common one and its distribution correlated well with a higher metabolic ratio for debrisoquine. These data demonstrate that important interethnic differences exist in the structure of the CYP2D locus, and they suggest that the frequent distribution of the C188-->T mutation among the CYP2D6Ch genes explains the lower capacity among Chinese to metabolize drugs that are substrates of CYP2D6, such as antidepressants and neuroleptic agents.

Published
1994

42. Applicability of agricultural waste and by-products for adsorptive removal of heavy metals from wastewater.

Author

Nguyen TA, Ngo HH, Guo WS, Zhang J, Liang S, Yue QY, Li Q, and Nguyen TV

Subjects
Adsorption, Agriculture, Metals, Heavy isolation & purification, Wastewater chemistry, Water Pollutants, Chemical isolation & purification, Water Purification methods
Abstract

This critical review discusses the potential use of agricultural waste based biosorbents (AWBs) for sequestering heavy metals in terms of their adsorption capacities, binding mechanisms, operating factors and pretreatment methods. The literature survey indicates that AWBs have shown equal or even greater adsorption capacities compared to conventional adsorbents. Thanks to modern molecular biotechnologies, the roles of functional groups in biosorption process are better understood. Of process factors, pH appears to be the most influential. In most cases, chemical pretreatments bring about an obvious improvement in metal uptake capacity. However, there are still several gaps, which require further investigation, such as (i) searching for novel, multi-function AWBs, (ii) developing cost-effective modification methods and (iii) assessing AWBs under multi-metal and real wastewater systems. Once these challenges are settled, the replacement of traditional adsorbents by AWBs in decontaminating heavy metals from wastewater can be expected in the future., (Copyright © 2013 Elsevier Ltd. All rights reserved.)

Published
2013
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43. Cationic polyacrylamide as coagulant aid with titanium tetrachloride for low molecule organic matter removal.

Author

Zhao YX, Gao BY, Qi QB, Wang Y, Phuntsho S, Kim JH, Yue QY, Li Q, and Shon HK

Subjects
Flocculation, Hydrogen-Ion Concentration, Acrylic Resins chemistry, Titanium chemistry, Water chemistry, Water Purification methods
Abstract

This is the first attempt to use cationic polyacrylamide (PAM) as coagulant aid with titanium tetrachloride (TiCl4) to improve the coagulation performance and floc properties. Coagulation-flocculation treatment was applied to simulated water (with fulvic acid (FA) as model organic matter) for both coagulation behavior investigation and floc characterization. The effect of PAM on floc reformation properties after cyclic breakage/regrowth was also investigated. Ultrafiltration experiments were performed to investigate the influence of PAM aided TiCl4 coagulation on the membrane fouling. The results showed that organic removal was enhanced by PAM addition at low TiCl4 doses. Floc growth rate and floc size were significantly affected by dosing sequence. TiCl4-PAM significantly improved the floc strength factors (Sf) and recovery factors (Rf). The dosing sequence of TiCl4 and PAM significantly influenced the floc structure. Characterization of the flocculated sludge indicated that TiO2 with anatase structure and high photocatalytic activity could be obtained from the TiCl4-PAM flocculated sludge., (Copyright © 2013 Elsevier B.V. All rights reserved.)

Published
2013
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44. Anionic polymer compound bioflocculant as a coagulant aid with aluminum sulfate and titanium tetrachloride.

Author

Zhao YX, Gao BY, Shon HK, Wang Y, Kim JH, Yue QY, and Bo XW

Subjects
Anions, Flocculation, Models, Chemical, Alum Compounds chemistry, Polymers chemistry, Titanium chemistry, Waste Disposal, Fluid methods, Water Purification methods
Abstract

The objectives of this study are to investigate the impacts of anionic polymer compound bioflocculant (CBF) as a coagulant aid on coagulation performance and floc characteristics with titanium tetrachloride (TiCl(4)) and aluminum sulfate (Al(2)(SO(4))(3)). The effect of dosing sequence was also investigated. Floc size, breakage, regrowth and floc fractal dimension were examined using a laser diffraction instrument. The results showed that CBF with TiCl(4) or Al(2)(SO(4))(3) coagulants exhibited synergistic effects by promoting dissolved organic carbon (DOC) removal. For both TiCl(4) and Al(2)(SO(4))(3), the floc recoverability was improved by CBF addition, and the flocs formed by TiCl(4) and the corresponding dual-coagulants showed weaker recovery ability than those by Al(2)(SO(4))(3) and the corresponding dual-coagulants. Fractal dimension analysis demonstrated that the floc fractal dimension values increased with the increasing coagulant dose. The effect of CBF on fractal dimension of the flocs generated by TiCl(4) was different from that of Al(2)(SO(4))(3)., (Copyright © 2012 Elsevier Ltd. All rights reserved.)

Published
2012
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45. The effect of second coagulant dose on the regrowth of flocs formed by charge neutralization and sweep coagulation using titanium tetrachloride (TiCl4).

Author

Zhao YX, Gao BY, Shon HK, Wang Y, Kim JH, and Yue QY

Subjects
Flocculation, Titanium chemistry
Abstract

Characteristics of flocs formed by charge neutralization and sweep coagulation using titanium tetrachloride (TiCl(4)) were investigated with humic acid-kaolin suspension by continuous optical monitoring. This paper focused on the regrowth ability of broken flocs after addition of second TiCl(4) dose. Variation of floc size and the fractal dimension of flocs versus second TiCl(4) dose after regrowth were investigated. Second TiCl(4) dose was added during the floc breakage period, and addition time of second TiCl(4) dose was also investigated. The results showed that, when coagulated by charge neutralization at pH 6, an appropriate second TiCl(4) dose improved regrowth ability of broken flocs at low initial TiCl(4) doses. While for high initial TiCl(4) doses, second TiCl(4) dose lowered floc re-growth ability. When coagulated by sweep coagulation at pH 10, second TiCl(4) dose made regrown flocs larger than those without second TiCl(4) dose. Floc structure analysis showed that it was determined by not only the fractal dimension of flocs, but also the chemical characteristics of floc surface. Addition time of second TiCl(4) dose had a great effect on floc regrowth ability, suggesting that the broken flocs had better regrowth when second TiCl(4) dose was added at the end of the breakage period., (Copyright © 2011 Elsevier B.V. All rights reserved.)

Published
2011
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46. Effect of shear force, solution pH and breakage period on characteristics of flocs formed by Titanium tetrachloride (TiCl4) and Polyaluminum chloride (PACl) with surface water treatment.

Author

Zhao YX, Gao BY, Shon HK, Kim JH, and Yue QY

Subjects
Flocculation, Solutions, Aluminum Hydroxide chemistry, Hydrogen-Ion Concentration, Titanium chemistry
Abstract

The growth, breakage and regrowth nature of flocs formed by Titanium tetrachloride (TiCl(4)) and polyaluminum chloride (PACl) was comparatively evaluated with surface water treatment. A series of jar experiments were conducted to investigate the impacts of different operating parameters such as shear force, solution pH and a breakage period on floc strength and re-aggregation potential. Results indicated that the responses of flocs to different operating parameters depend on the coagulant used. The ability of floc to resist breakage decreased with the increase of shear force and breakage period. Floc strength properties were also measured in response to increasing shear force, with the results suggesting that the order of floc strength was TiCl(4)>PACl. Floc regrowth of the two coagulants after exposure to high shear was limited, and flocs formed by TiCl(4) displayed weaker recoverability. The flocs generated in acid conditions were more recoverable than those generated in alkaline conditions no matter which coagulant was used., (Copyright © 2011 Elsevier B.V. All rights reserved.)

Published
2011
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47. Strength and regrowth properties of polyferric-polymer dual-coagulant flocs in surface water treatment.

Author

Wei JC, Gao BY, Yue QY, and Wang Y

Subjects
Coagulants chemistry, Hydrogen-Ion Concentration, Particle Size, Polyethylenes chemistry, Quaternary Ammonium Compounds chemistry, Temperature, Time Factors, Water chemistry, Water Pollutants, Chemical analysis, Ferric Compounds chemistry, Iron chemistry, Polymers chemistry, Waste Disposal, Fluid methods, Water Purification methods
Abstract

The floc strength and regrowth properties of three polyferric-cationic polymer dual-coagulants were comparatively evaluated using surface water sample. The first dual-coagulant PFC-PD was prepared by premixing of polyferric chloride (PFC) and polydiallyldimethylammonium (PDADMAC) before dosing. The other two, PFCF (PFC dosed firstly) and PDF (PDADMAC dosed firstly), were achieved by dosing PFC and PDADMAC in different order. Floc strength properties were measured in response to increasing shear levels in the long period and high shear level in the short or long period. For the given optimum dose (3.0 mg L(-1)) and water pH (6.5) condition, the order of floc strength was PFCF>PDF>PFC-PD. The dual-coagulant which gave stronger flocs also gave a lower absolute value of zeta potential. The floc regrowth properties of all three dual-coagulants after short and long period high shear level were also investigated. The floc recoverability was in the following order: PFCF>PFC-PD>PDF., ((c) 2009 Elsevier B.V. All rights reserved.)

Published
2010
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48. Performance and mechanism of polyferric-quaternary ammonium salt composite flocculants in treating high organic matter and high alkalinity surface water.

Author

Wei JC, Gao BY, Yue QY, Wang Y, and Lu L

Subjects
Flocculation, Fresh Water, Hydrogen-Ion Concentration, Ferric Compounds chemistry, Organic Chemicals isolation & purification, Quaternary Ammonium Compounds chemistry, Water Pollutants, Chemical isolation & purification, Water Purification methods
Abstract

A series of composite flocculants PFC-PD with different basicity (B) of polyferric chloride (PFC), different weight percentage (w(P)) and intrinsic viscosity (eta) of polydimethyl diallylammonium chloride (PDMDAAC) were prepared by prepolymerization. The turbidity, dissolved organic carbon (DOC) and specific ultraviolet absorbance (SUVA) removal efficiency as well as flocculation mechanism of PFC-PD were compared with that of PFC, PDMDAAC and successive addition of PFC and PDMDAAC in treating high DOC and high alkalinity surface water by jar tests. The effect of B, w(P) and eta on coagulation efficiency and mechanisms were also studied. The experimental results showed that PFC-PD was more efficient and more applicable for turbidity, DOC and SUVA removal than PFC, PDMDAAC and successive addition of PFC and PDMDAAC. Further, the water pH was slightly depressed by PFC-PD. Coagulation efficiency of PFC-PD was improved at lower B, larger w(P) and larger eta. Charge neutralization was dominant mechanism of PFC-PD.

Published
2009
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49. Synthesis of polyamine flocculants and their potential use in treating dye wastewater.

Author

Yue QY, Gao BY, Wang Y, Zhang H, Sun X, Wang SG, and Gu RR

Subjects
Microscopy, Electron, Transmission, Coloring Agents isolation & purification, Flocculation, Industrial Waste, Polyamines chemical synthesis, Water Pollutants, Chemical isolation & purification
Abstract

Polyamine flocculants were synthesized by the polycondensation of dimethylamine and epichlorohydrin, in which organic amines, e.g. 1,2-diaminoethane, were used as modifying agents. Different products were obtained by varying the reaction parameters, such as the molar ratio of epichlorohydrin to dimethylamine, the amount of 1,2-diaminoethane and reaction temperature. The polyamine flocculants were characterized by transmission electron microscope (TEM). Their flocculation performance was evaluated with simulated dye liquor and actual printing and dyeing wastewater. The behavior of the flocculants was compared with that of inorganic coagulant, polyaluminum chloride (PAC). The experimental results show that polyamine with the highest viscosity and cationicity could be prepared under following conditions: an epichlorohydrin to dimethylamine molar ratio of 1.5, a reaction temperature of 70 degrees C, a 3% content of 1,2-diaminoethane in the total reaction monomers and a reaction time of 7h. Polyamine polymers can, as flocculants for treating simulated and actual dye wastewater, remove color and COD efficiently. The rate of color removal from reactive red liquor, reactive blue liquor and reductive yellow liquor reached as high as 96%, 97% and 96%, respectively. The highest efficiency of color removal and COD removal from polyamine for treating dye wastewater was 90% and 89%, respectively.

Published
2008
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50. The performance and application of fly ash modified by PDMDAAC.

Author

Cao XY, Yue QY, Song LY, Li M, and Zhao YC

Subjects
Adsorption, Coal Ash, Coloring Agents, Surface Properties, Carbon, Construction Materials, Industrial Waste prevention & control, Particulate Matter, Polyethylenes, Quaternary Ammonium Compounds, Water Pollutants isolation & purification
Abstract

Fly ash modification by polydimethydiallylammonium chloride (PDMDAAC) in laboratory scale was explored in this work and the adsorption performance of modified fly ash and its application in dyeing wastewater treatment were also studied. The key factors (concentration and temperature) for PDMDAAC to affect the adsorption properties of fly ash (FA) were revealed using the orthogonal test with four factors. The results indicated that the adsorption magnitude of fly ash to PDMDAAC increased due to its favorable specific surface causing the change of the surface charge nature. Hence, adsorption performance of modified fly ash on organic molecules and its ion exchange capacity are strengthened. The maximum color removal efficiency was obtained as 88.2% by modified fly ash with 2.0 g/100 mL dosage in dyeing wastewater, which is much higher than 12.5% color removal efficiency by raw fly ash with the same dosage. And, the used modified fly ash could be used for cement production as additive agent. The intensity of cement produced with 15% the modified fly ash in weight reached the Chinese Cement Standard (GB/T17671-1999), blazing a promising novel way in fly ash utilization.

Published
2007
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