脱除H_2S用铁/凹凸棒石的优化制备及性能评价  

Optimization of preparation conditions and performance evaluation of Fe/attapulgite for H_2S removal

作　　者：张智宏[1] 梁慧军[1] 杜晓刚[1] 左晓亮[1] 

机构地区：[1]常州大学石油化工学院,常州213164

出　　处：《环境化学》2012年第12期1990-1995,共6页Environmental Chemistry

基　　金：国家重大科学研究计划项目(2006CB932504);江苏省高校自然科学研究计划项目(01KJB530004)资助

摘　　要：用均相沉淀法制备了铁/凹凸棒石复合物用于H2S的脱除.考察了反应物配比、反应时间和反应温度对铁转化率、体系pH值和Fe3+浓度变化的影响;用透射电镜对不同条件制得的脱硫剂的形貌进行了表征,以模拟工业尾气为气源做H2S动态吸附实验.结果表明,体系pH值的上升是Fe3+完全沉淀的标志;体系OH-浓度主要受反应温度的影响,升高反应液温度有利于提高铁转化率,而反应物配比对其影响不大;升高温度会使沉淀速度过快,引起凹凸棒石表面铁分散性下降,形貌发生变化,导致脱硫剂性能下降.The Fe/attapulgite desulfurizers for H2S removal were prepared by homogeneous precipitation. The effects of preparation conditions on the conversion efficiency of iron, pH and Fe3＋ concentration were investigated by changing the reactant ratio, reaction time and temperature. The morphology of desulfurizers prepared under various conditions was characterized by transmission electron microscopy （TEM）. Dynamic adsorption experiments were carried out with simulated industrial off-gases as gas source. The results showed that the conversion efficiency of ferric increased with reaction temperature rather than the reactant ratio, because the concentration of OH - in the system strongly depends on the reaction temperature. The increase of pH value in the solution is a sign of complete precipitation of Fe3＋ At the elevated temperature, the accelerated sedimentation caused the dispersion of iron substance on the attapulgite to reduce and its morphology to ehange. Therefore, the sulfur capacity of desulfurizers declined.

关 键 词：铁 凹凸棒石 H2S 铁转化率 均相沉淀法 

分 类 号：X701.3[环境科学与工程—环境工程]