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Factors influencing antibiotics adsorption onto engineered adsorbents

Journal of Environmental Sciences 2013年第7期25卷 1291-1299页

作者： Mingfang Xia Aimin Li Zhaolian Zhu Qin Zhou Weiben Yang State Key Laboratory of pollution control and Resources Reuse School of the Environment Nanjing University general office of lake taihu water pollution prevention and control of jiangsu province School of Chemistry and Materials Science Nanjing Normal University

The study evaluated the adsorption of two antibiotics by four engineered adsorbents （hypercrosslinked resin MN-202, macroporous resin XAD-4, activated carbon F-400, and multi-walled carbon nanotubes （MWCNT）） from aqueous solutions. The dynamic results demonstrated the dominant influence of pore size in adsorption. The adsorption amounts of antibiotics on XAD-4 were attributed to the hydrophobic effect, whereas steric hindrance or micropore-filling played a main role in the adsorption of antibiotics by F-400 because of its high microporosity. Aside from F-400, similar patterns of pH-dependent adsorption were observed, implying the importance of antibiotic molecular forms to the adsorption process for adsorbents. Increasing the ionic concentration with CaCl 2 produced particular adsorption characteristics on MWCNT at pH 2.0 and F-400 at pH 8.0, which were attributed to the highly available contact surfaces and molecular sieving, respectively. Its hybrid characteristics incorporating a considerable portion of mesopores and micropores made hypercross linked MN-202 a superior antibiotic adsorbent with high adsorption capacity. Furthermore, the adsorption capacity of MWCNT on the basis of surface area was more advantageous than that of the other adsorbents because MWCNT has a much more compact molecular arrangement.

关键词： adsorption resin carbon nanotubes pore size surface area

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2D-QSAR Using MLR and 3D-QSAR Using CoMSIA Studies on the Toxicity of Aromatic Hydrocarbons on Larval Sinonvaculina Constricta

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Chinese Journal of Structural Chemistry 2012年第3期31卷 420-428页

作者：王翠华蒋玫李小林沈新强于红霞邬旸 East China Sea Fisheries Research Institute Chinese Academy of Fisheries Sciences State Key Laboratory of pollution control and Resources Reuse Nanjing University general office of lake taihu water pollution prevention and control Jiangsu Province

Aromatic hydrocarbons,one of the persistent organic pollutants（POPs）,has been usually found in mussels,accumulated for their hard mobility and activities in harbours and *** this study,based on the 96 hr-LC50 of 12 aromatic hydrocarbons with larval sinonvaculina constricta,three-dimensional quantitative structure-activity relationship（3D-QSAR） technique：comparative molecular similarity indices analysis（CoMSIA） and 2D-QSAR technique：multiple linear regression（MLR） were described to obtain more detailed insight into the structure-activity relationships between the molecular structure and *** results show the MLR model based on density functional theory（DFT） calculation carried out at the B3LYP/6-311＊＊ level with Gaussian 03 program yielded a very good correlation with a coefficient squared R2 of 0.716 and a cross-validated Q2 of *** dipole moment and enthalpy,as the thermodynamic parameters,were two important factors influencing ***,CoMSIA based on the partial least-squares（PLS） methodology with steric,electrostatic,hydrophobic,H-bond donor and acceptor fields contributing simultaneously were employed and the values of R2 and the cross validation with leave-One-Out（LOO） Q2LOO were 0.585 and 0.990,respectively,which reveals the structure features,such as the electronegative substituent（nitro-group）,hydrophobic groups（the benzene ring） and H-bond（nitro-group）,related to the *** results of 2D-QSAR employing MLR model and 3D-QSAR employing CoMSIA model provide the useful information for predicting the toxicity of other aromatic hydrocarbons by comparing the molecular structures of similar compounds.

关键词： aromatic hydrocarbons larval Sinonvaculina constricta acute toxicity CoMSIA MLR

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Theory and Practice of water pollution prevention and control for Inflowing Rivers in taihu Valley

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Journal of Environmental Science and Engineering 2010年第8期4卷 13-25页

作者： L.M. Zhang W.H. Sun W. Cheng W.J. Liu C. Wang general office of lake taihu water pollution prevention and control Jiangsu 210029 China jiangsu Provincial Academy of Environmental Science Jiangsu 210036 China

The pollutants from the 15 rivers inflowing into lake taihu accounted for about 80% of the total amount of the pollutants inflowing into lake taihu. Therefore, overall treatment of the inflowing rivers of taihu lake is of great importance to the improvement of water environment in the valley and the eutrophication status in th lake. Firstly, the basic ideas, key taches and main methods for water pollution control of inflow rivers of taihu lake was put forward in this article, Basic on these theories, the pollutant source status in the comprehensive treatment zone of the 15 major inflow rivers was analysized, the countermeasures of pollution control and main regulation projects were introduced, and the total abatement of pollutants was predicted. With the implement of regulation projects, the number of rivers with water quality worse than Grade V among the 15 major inflow rivers had come from 9 to 3, and the eutrophication status of taihu lake had changed from medium level to light level. The overall treatment of the major inflow rivers of the taihu lake had achieved initial success.

关键词： taihu inflowing rivers control of water environment theory practice.

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