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Your search keyword '"Liu, Zhiqian"' showing total 294 results
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294 results on '"Liu, Zhiqian"'

16. Preparation of phosphorylated conjugated microporous organic polymers and extraction of low-concentration rare earth elements

Author

Liu Zhiqian, Mi Yace, Liu Qing, Rong Meng, and Yang Liangrong

Subjects
Environmental sciences, GE1-350
Abstract

Aiming at the extraction and recovery of rare earth elements (REEs) in low-concentration rare earth leaching tailings, a kind of phosphorylated conjugated microporous organic polymer (P-CMP) was prepared and applied to adsorb rare earth ions (Nd3+, Dy3+, Y3+). The structure of P-CMP was characterized by FT-IR. SEM and EDS were utilized to illustrate the surface morphology and element distribution of P-CMP, respectively.The adsorption mechanism of P-CMP was determined by XPS. The effects of pH, ion concentration and adsorption time on adsorption capacity were investigated. The isotherm of the rare earth adsorption process was fitted by Langmuir and Freundlich models, and the kinetics was fitted by Pseudo-firstorder and Pseudo-second-order. The results show that P-CMP is an amorphous microporous material, which has strong interaction with Nd3+ (30.18 mg/g), Dy3+ (37.84 mg/g) and Y3+ (22.01 mg/g), and the synergistic effect of amino and phosphate groups provides good selectivity (S.F.(Nd3+/Men+) = 5*103~5*104). The PCMP selectively adsorbs rare earth ions in the actual system and cycles 8 times.

Published
2024
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20. PSD Random Vibration Strength and Fatigue Analysis of a CNG Tube Trailer

Author

Liu, Zhiqian, Qian, Caifu, Chen, Zuzhi, Ceccarelli, Marco, Series Editor, Hernandez, Alfonso, Editorial Board Member, Huang, Tian, Editorial Board Member, Takeda, Yukio, Editorial Board Member, Corves, Burkhard, Editorial Board Member, Agrawal, Sunil, Editorial Board Member, Xu, Jinyang, editor, and Pandey, Krishna Murari, editor

Published
2021
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30. A Chiral-LC-MS Method for the Simultaneous Quantification of Short-Chain Fatty Acids and D/L-Lactate in the Ruminal Fluid of Dairy Cows.

Author

Liu, Zhiqian, Williams, S. Richard O., Jacobs, Joe L., Neachtain, Aodan S. O., and Rochfort, Simone

Subjects
*SHORT-chain fatty acids, *DAIRY cattle, *FATTY acids, *FLUIDS, *BLOOD lactate, *LIQUID chromatography-mass spectrometry, *LACTATES
Abstract

Short-chain fatty acids (SCFA) and lactate in ruminal fluid are products resulting from the microbial fermentation of substrates and can be used to reflect the composition and activity of the ruminal microbiome. Determination of SCFA and D-/L-lactate in ruminal fluid currently requires two separate protocols, which is time-consuming and costly. In this study, we have optimised and validated a simple and unified 3-nitrophenylhydrazine (3-NPH) derivatisation protocol and a 20 min chiral-LC-MS method for the simultaneous quantification of all SCFA and D- and L-lactate in ruminal fluid. This method, which requires no sample pretreatment or purification shows adequate sensitivity (limit of detection (LOD): 0.01 µg/mL), satisfactory accuracy (recovery: 88–103%), and excellent reproducibility (relative standard deviation (RSD) for repeated analyses < 3% for most analytes). The application of this method to a cohort of 24 animals allowed us to reveal a large inter-cow variation in ruminal SCFA and lactate level, the concentration range for each species, the widespread correlation between different SCFA, and the strong correlation between D- and L-lactate. [ABSTRACT FROM AUTHOR]

Published
2024
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