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703 results on '"Wan, Yinhua"'

155. Facile synthesis of a fluorescent probe based on a terbium-based metal–organic framework for selective detection of Fe(III) and Al(III).

Author

Jing, Xuequan, Liu, Jiaming, Guo, Meina, Chen, Guoliang, Ren, Guoqing, Li, Jiarong, Qin, Haonan, Yao, Zhangwei, Wan, Yinhua, Song, Weijie, Zeng, Huifeng, Yang, Feifei, Zhao, Da, and Hu, Kang

Subjects
TERBIUM, FLUORESCENT probes, METAL-organic frameworks, CHEMICAL stability, WATER sampling, ENVIRONMENTAL sampling
Abstract

It is critical to detect Fe3+ and Al3+ rapidly and accurately due to their high risk to humans and the ecological environment. In this work, a kind of terbium-based metal–organic framework fluorescent probe (Tb-MOF) is facilely fabricated that displays ultra-high selective detection of Fe3+ and Al3+ over various coexisting ions (i.e. Mn2+, Co2+, K+, Ca2+, Na+, Mg2+, Cd2+, Cu2+, Fe2+, Zn2+, Ni2+, Pb2+ and Cr3+). The obtained Tb-MOF exhibits emission at 547 nm and possesses outstanding thermal, fluorescent and chemical stability. The Tb-MOF shows a ratiometric fluorescence signal for Al3+, and the detection limits for Fe3+ and Al3+ are 0.91 and 6.10 μM, respectively. Moreover, the fluorescence intensities and concentrations of Fe3+ and Al3+ have good linear relationships across wide concentration ranges. Furthermore, the quantifications of Fe3+ and Al3+ are achieved in complex tap and river water samples with good recoveries. This study offers a facile and efficient method of developing a fluorescent probe that possesses the ability to quantify Fe3+ and Al3+ in real environmental water samples. [ABSTRACT FROM AUTHOR]

Published
2023
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158. Enhanced selective separation of vanadium(V) and chromium(VI) using the CeO2 nanorod containing oxygen vacancies.

Author

Lin, Ruixi, Li, Jiarong, Jing, Xuequan, Guo, Meina, Ren, Guoqing, Qin, Haonan, Yao, Zhangwei, Wan, Yinhua, Song, Weijie, Zeng, Huifeng, Yang, Feifei, Zhao, Da, and Hu, Kang

Subjects
NANORODS, CHROMIUM, COPPER, VANADIUM, OXYGEN, MONOMOLECULAR films
Abstract

Adsorption of vanadium from wastewater defends the environment from toxic ions and contributes to recover the valuable metal. However, it is still challenging for the separation of vanadium (V5+) and chromium (Cr6+) because of their similar properties. Herein, a kind of CeO2 nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V5+ against various competitive ions (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Mg, Be, and Co). Moreover, a large separation factor (SFV/Cr) of 114,169.14 for the selectivity of V5+ is achieved at the Cr6+/V5+ ratio of 80 with the trace amount of V5+ (~ 1 mg/L). The results show that the process of V5+ uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V5+ is reduced to V3+ and V4+ and then formation of V–O complexation. This work offers a novel CeO2 nanorod material for efficient separation of V5+ and Cr6+ and also clarifies the mechanism of the V5+ adsorption on the CeO2 surface. [ABSTRACT FROM AUTHOR]

Published
2023
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189. L-Cys-Assisted Conversion of H2/CO2 to Biochemicals Using Clostridium ljungdahlii.

Author

Yang, Yuling, Cao, Weifeng, Shen, Fei, Liu, Zhiqian, Qin, Linli, Liang, Xinquan, and Wan, Yinhua

Abstract

Carbon fixation and conversion based on Clostridium ljungdahlii have great potential for the sustainable production of biochemicals (i.e., 2,3-butanediol, acetic acid, and ethanol). Here, the effects of reducing agents on the production of biochemicals from H2/CO2 using C. ljungdahlii were studied. It was found that the element S and reducing power could significantly affect the production of biochemicals, and cysteine (Cys) was better than sodium sulfide for the production of biochemicals, especially for the production of 2,3-butanediol. Moreover, comparing to the control (i.e., without the addition of Cys), the gene expression profiles indicated that the fdh and adhE1 were significantly upregulated with the addition of Cys, which involved in pathways of the CO2 fixation and ethanol production. Therefore, the irreplaceability of Cys on the production of biochemicals was both caused by its utilization as a reducing agent and its effect on the metabolic pathway. Finally, compared to the control, the production of 2,3-butanediol was increased by 2.17 times under the addition of 1.7 g/L Cys. [ABSTRACT FROM AUTHOR]

Published
2023
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195. Mix-Charged Nanofiltration Membrane for Efficient Organic Removal from High-Salinity Wastewater: The Role of Charge Spatial Distribution

Author

Ren, Yuling, Qi, Pengfei, Han, Yujie, Wan, Yinhua, Lin, Jiuyang, Xie, Ming, Chen, Xiangrong, Feng, Shichao, and Luo, Jianquan

Abstract

The efficient removal of organic contaminants from high-salinity wastewater is crucial for resource recovery and achieving zero discharge. Nanofiltration (NF) membranes are effective in separating organic compounds and monovalent salts, but they typically exhibit an excessive rejection of divalent salts. Modifying the charge characteristics of NF membranes can improve salt permeation; however, the role of charge spatial distribution in governing salt transport behavior is not fully understood. In this study, we developed a mix-charged NF membrane with a horizontal charge distribution by employing interfacial polymerization combined with a polyester template etching and solvent-induced polyamine intercalation strategy. The ratio of positive to negative charge domains in the membrane can be precisely controlled by adjusting the aqueous monomer ratio and polyamine modifier type. X-ray photoelectron spectroscopy (XPS) depth profiling and separation layer thickness analysis confirmed the complete penetration of polyamines into the separation layer, providing direct evidence of the formation of horizontally distributed charge domains. This unique charge distribution results in a high charge density and a near-electroneutral surface, which facilitates the permeation of the divalent salts. The size-dependent “plug-in” modification and covalent cross-linking further reduce pore size, enhancing rejection of small organic molecules. Additionally, the membrane demonstrated exceptional antifouling performance against both negatively and positively charged pollutants, attributed to its unique charge distribution and smooth surface. Molecular dynamics (MD) simulations further revealed that weak electrostatic interactions and a tightly bound hydration layer contribute to the membrane’s superior antifouling properties. This work provides valuable insights into the design of NF membranes with tailored microstructures and charge distributions for improved water treatment performance.

Published
2025
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196. Targeted modification of polyamide nanofiltration membrane for efficient separation of monosaccharides and monovalent salt

Author

Wang, Jingyu, Ren, Yuling, Zhang, Huiru, Luo, Jianquan, Woodley, John M., Wan, Yinhua, Wang, Jingyu, Ren, Yuling, Zhang, Huiru, Luo, Jianquan, Woodley, John M., and Wan, Yinhua

Abstract

Separation of monosaccharides and monovalent salts is important in the biorefinery and food industry. Nanofiltration (NF) technology is promising for this purpose but its poor selectivity still needs to be addressed. In this work, the separation of monosaccharides and monovalent salts by NF is improved by regulating the surface charge and pore size distribution of polyamide NF membranes. The carboxyl groups on the polyamide membrane are selectively activated by N-(3-Dimethylaminopropyl)-N′-ethyl carbodiimide (EDC) and N-hydroxy succinimide (NHS), and subsequently molecules with amino groups are grafted on the membrane to reduce the effective pore size and electronegativity. The conditions and grafted molecules are optimized, and polyethyleneimine (600 Da) is selected as the best for enhancing the separation of glucose/fructose and KCl. Such targeted modification is found to reduce the effective mean pore size while maintaining the porosity of the NF270 membrane, due to pore segmentation. This results in a remarkable improvement in glucose/fructose rejection (from 67.96% to 84.14%) and separation factor (from 2.20 to 6.78), with only a 4.70% permeability loss. The modified membrane also maintains separation performance in crossflow filtration and after alkaline cleaning (pH 12), which outperforms the pristine NF270 and those modified by mussel-inspired coating and simple physical adsorption.

Published
2021

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