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Influence of inorganic salt on aerobic biodegradability of dyestuffs

Journal of Environmental Sciences 2000年第4期12卷 416-421页

作者： Zhan, X. Wang, J. Wen, X. Feng, Y. Qian, Y. Key Joint Lab. on Envl. Simulation Dept. of Envtl. Sciences and Eng. Tsinghua University Beijing 100084 China

In this paper, the influence of inorganic salt on aerobic biodegradability of dyestuffs was studied by means of semi-continuous activated sludge method. It was found that: biodegradability of dyestuffs would decrease with the increase of the concentration of NaCl; however, biodegradability in the condition of NaCl = 30 g/L was better than that in the condition of NaCl = 15 g/L; in the three NaCl conditions, biodegradability of tested dyestuffs followed the following order: NaCl = 0 g/L>NaCl = 30 g/L>NaCl = 15 g/L.

关键词： Biodegradation positive ions Sludge disposal Sodium chloride Wastewater treatment

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Extraction of copper ions by supercritical carbon dioxide

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Journal of Environmental Sciences 2000年第4期12卷 444-447页

作者： Cui, Z. Liu, J. Gao, L. Wei, Y. Dept. of Environmental Engineering Shandong University Jinan 250100 China

Complexation combined with supercritical fluid extraction was used to extract Cu2+ in this study. The effects of pressure, temperature, volume of CO2 on the efficiency of extraction were systematically investigated. At the optimum condition a 57.32% recovery was achieved. Addition of suitable amount of methanol (v/v = 5%) to the supercritical CO2 can increase in the extraction of Cu2+ (72.69%, RSD = 2.12%, n = 3). And the recovery can further increase in the presence of non-ionic surfactant Triton X-100 because of its function of solubilization. Surfactant was first used in the extraction of metal ions in the present study, and the results are satisfied (90.52%, RSD = 2.20%, n = 3).

关键词： Carbon dioxide Chelation Copper Methanol positive ions Pressure effects Solubility Surface active agents Thermal effects

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Study on catalyst for pyridine synthesis

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Journal of Southeast University(English Edition) 2004年第1期20卷 62-64页

作者：张进肖国民梁衡弘东南大学化学化工系南京210096

The synthesis of pyridine from aldehydes and ammonia was performed over ZSM-5 catalyst. The catalytic activity in reaction was correlated with the acidity of the zeolite catalysts. A few of ZSM-5 (m(SiO2)/m(Al2O3)=120) were prepared and modified with Co2+, Fe3+. The surface acidity was determined by Py-IR technique. It was found that CoZSM-5 and FeZSM-5 have fewer Lewis acid sites than HZSM-5. The decrease of Lewis acid sites leads to decreasing the ability of NH3 adsorption, this phenomenon insures that there are adequate acid sites discovering and reacting with aldehydes. It is advantageous to the reaction. By using a CoZSM-5 catalyst, the yields of pyridine base can reach 78%. The study provides a theoretical base for preparing high activity and high selective catalyst for pyridine synthesis.

关键词： Acidity Aldehydes Ammonia Chemical reactions Infrared radiation Nitrogen compounds positive ions Zeolites

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