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- 저자 : Ziyuan Yang (검색결과 3 건)
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Ting Chen,Lianyu Zhao,Ziyuan Wang,Jishi Zhao,Yan Li,Hangyu Long,Ming Yang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
A novel geminized amphiphilic polymer containing double cationic head groups and hydrophobic tails ineach structural unit (denoted as PAGBn), has been prepared in our study. The self-assembly behavior onthe solid/liquid interface was investigated by quartz crystal microbalance with dissipation (QCM-D),steady-statefluorescence, dynamic light scattering (DLS) and transmission electron microscope (TEM). Atwo-regime buildup can be observed, where thefirst regime is attributed to the rapid adsorption ofpolymers, while a rearrangements of pre-adsorbed molecules and their aggregation on the surfacedominate the second regime, exhibiting a formation of aggregates in large sizes due to the effect of thecharge density and hydrophobes on the self-assembly process. It exhibits a drastically enhanced killingefficiency of99.9% against both of Staphylococcus aureus and Escherichia coli bacteria for PAGBncompared with other traditional single-chained polymers, through the reinforced synergistic effect ofelectrostatic and hydrophobic interactions, and the formation of large-sized polymer aggregates,encompassing and killing the bacteria more efficiency. Ourfindings reveal the antibacterial mechanismand the correlation between antibacterial activity and aggregates structure, providing a basis for thedevelopment of super-antibacterial materials in the infection resistant applications.
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Rejection rate and mechanisms of drugs in drinking water by nanofiltration technology
Sijie Ge,Li Feng,Liqiu Zhang,Qiang Xu,Yifei Yang,Ziyuan Wang,Ki-Hyun Kim 대한환경공학회 2017 Environmental Engineering Research Vol.22 No.3
Nanofiltration (NF) technology is a membrane-based separation process, which has been pervasively used as the high-effective technology for drinking water treatment. In this study, a kind of composite polyamide NF thin film is selected to investigate the removal efficiencies and mechanisms of 14 trace drugs, which are commonly and frequently detected in the drinking water. The results show that the removal efficiencies of most drugs are quite high, indicating the NF is an effective technology to improve the quality of drinking water. The removal efficiencies of carbamazepine, acetaminophen, estradiol, antipyrine and isopropyl-antipyrine in ultrapure water are 78.8 ± 0.8%, 16.4 ± 0.5%, 65.4 ± 1.8%, 71.1 ± 1.5% and 89.8 ± 0.38%, respectively. Their rejection rates increase with the increasing of their three-dimensional sizes, which indicates that the steric exclusion plays a significant role in removal of these five drugs. The adsorption of estradiol with the strongest hydrophobicity has been studied, which indicates that adsorption is not negligible in terms of removing this kind of hydrophobic neutral drugs by NF technology. The removal efficiencies of indomethacin, diclofenac, naproxen, ketoprofen, ibuprofen, clofibric acid, sulfamethoxazole, amoxicillin and bezafibrate in ultrapure water are 81 ± 0.3%, 86.3 ± 0.5%, 85.7 ± 0.4%, 93.3 ± 0.3%, 86.6 ± 2.5%, 90.6 ± 0.4%, 59.7 ± 1.7%, 80.3 ± 1.4% and 80 ± 0.5%, respectively. For these nine drugs, their rejection rates are better than the above five drugs because they are negatively charged in ultrapure water. Meanwhile, the membrane surface presents the negative charge. Therefore, both electrostatic repulsion and steric exclusion are indispensable in removing these negatively charged drugs. This study provides helpful and scientific support of a highly effective water treatment method for removing drugs pollutants from drinking water.
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Hongkai Guo,Hu Xu,Chengwen Zhao,Xiangzhong Hao,Ziyuan Yang,Weijun Xu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Achieving high catalytic performance with the lowest cost possible cathode material is critical for electrocatalyticsynthesis of H2O2 by oxygen reduction reaction. In this work, we describe a method ofpreparing highly active yet stable graphite felt electrocatalysts containing ultrahigh-loading oxygen contentby using organic acid anodic modification. The results show that modified graphite felt surface wasmore hydrophilic and introduced a large amount of defect sites and oxygen-containing groups. Moreover,the influence of mass oxalic/citric acid ratio and oxidation time of graphite felt cathode were investigated. As a result, H2O2 electrogeneration was 1.6 times as much as that of virgin graphite felt counterpart at themass oxalic/citric acid ratio of 2:1 oxidation for 40 min. However, overoxidation also impaired the electricalproduction of H2O2 due to decarboxylation. Finally, the effect of cathode potential and reaction pHon graphite felt cathode was optimized. As for the modified graphite felt, the maximum accumulationrate of H2O2 reached 4.5 mg h1 cm2 at the conditions of 0.85 V (SCE), 0.4 L min1 O2 flow rate andpH = 3. In addition, it kept a stable performance for electrochemical generation of H2O2 during 8 cycles.
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