改性介孔分子筛吸附砷的研讨.doc

改性介孔分子筛吸附砷的研究 彭长宏，余芳，邓松，黄虹 (中南大学 冶金科学与工程学院，长沙，410083) 时间pH值温度对砷的平衡时间为180minpH值吸附温度为25 ℃，此条件下的吸附容量为8.5mg/g。FT-IR图谱等的测试结果表明，改性介孔分子筛对砷的去除存在化学配合和表面吸附。 关键词：改性吸附剂，介孔分子筛；吸附；砷 中图分类号：O647.3 文献标志码：A Study on arsenic adsorption by modified-mesoporous-molecular-sieve PENG Chang-hong, YU Fang, DENG Song, HUANG Hong (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: The adsorption properties from arsenic solution by modified-mesoporous-molecular-sieve (MMMS) were investigated using static and dynamic adsorption experiments respectively. The results of static adsorption experiment showed that the adsorption rate of arsenic is mainly determined by contacting time pH value and temperature, and its adsorption mechanism can be described by pseudo-first order kinetic equation. The equilibrium time of contact was 180 min, the optimum pH of adsorption was 3.0 and the best temperature was 25℃. The static saturated adsorption capacity of arsenic was 8.500 mg/g at above optimum conditions. The results of dynamic experiments show that the dynamic removal efficiency of arsenic is better than that of static experiment, and the dynamic adsorption capacity of arsenic was 8.701 mg/g. The results of FT-IR spectra analysis show that chemical complexation and surface adsorption are combined in the removal process of arsenic by MMMS. Key words: modified absorbent; mesoporous molecular sieve; adsorption; arsenic; 有色行业的发展带来了严重的砷污染问题，产生人畜中毒和死亡事故[1]。欧洲、美国及日本等西方国家实行饮用水的最高允许含砷浓度为10 μg/L[2]，我国目前规定的饮用水最高允许含砷浓度为50 μg/L[3]。所以，如何防治有色行业砷危害成为当前研究的重点和难点。有色与其它方法相比，吸附法简单易行、处理量大、经济适用、耐环境冲击等优点可用的吸附剂有活性铝、活性炭、赤铁矿与二氧化钛等傅红外谱电子显微镜EM)测试、X射线衍射(XRD)和BET等研究了改性介孔分子筛吸附剂吸附前后的结构特征。 1 试验 1.1 试剂与仪器 主要试剂：改性介孔分子筛，按文献[12]方法合成；其余试剂，如三氧化二砷、氢氧化钠、酚酞、甲基橙、无水乙醇和盐酸等均外购，所有购置试剂为分析纯。 主要仪器：水浴恒温振荡器循环水式多用真空泵1810b超纯水机PHS-25数显酸度计DHG-9070A电热恒温干燥箱DF-101S集热式恒温加热磁力搅拌器AUY220电子分析天平IRIS Intrepid II XSP电感耦合等离子体发射光谱仪NICOLET IS10傅里叶红外光谱仪X射线衍射仪JSM-6360LV扫描电子显微镜Tec