改性凹凸棒石处理痕量硝基苯废水

Treatment of Trace Nitrobenzene Wastewater by Modified Attapulgite

研究了用聚二甲基二烯丙基氯化铵（PDMDAAC）改性凹凸棒石对微污染水中痕量硝基苯的吸附性能、影响因素及其再生后吸附效果。结果表明：PDMDAAC改性凹凸棒石对微污染水中痕量苯酚具有较强的吸附能力，在pH＝8、硝基苯浓度为50μg／L、投加量为5g／L、吸附时间30min的条件下，吸附去除率达73％；改性后的凹凸棒石可用碱进行再生，再生后对硝基苯的吸附能力没有明显下降；改性凹凸棒石的等温静态吸附曲线呈线性关系。

PDMDAAC-attapulgite was prepared by modifying attapulgite with polydimethyldiallyl ammonium chloride （PDMDAAC）. Its performance of adsorption, influencing factors and adsorptive effect after regeneration for removing trace nitrobenzene from micro-polluted wastewater were investigated. It has shown that the adsorption of trace nitrobenzene by PDMDAAC-attapulgite was rather strong whilst nitrobenzene removal reaching 73% after 30 minutes under conditions of pH 8, wastewater containing 50 μg nitrobenzene/L and a dose of 5 g modified attapulgite/L. PDMDAAC-attapulgite could be regenerated with alkali and its nitrobenzene removal efficiency showed no obvious decline afterwards. Its adsorption isotherm was found to fit in with a linear relationship.