摘要
采用共沉淀法制备CaMgAl-HTLs,ZnMgAl-HTLs,FeMgAl-HTLs三种类水滑石(HTLs),在不同初始浓度、温度条件下对3种类水滑石的脱氯性能及其随反应时间的变化进行了试验研究,并结合热重分析对其吸附机理进行推测.结果表明,3种类水滑石材料都具有良好的脱氯性能,在整个试验过程中脱氯效率均在86%以上;瞬时脱氯效率均随反应时长的增加先减小后维持稳定;平均脱氯效率随HCl初始浓度升高而下降;平均脱氯效率随温度的升高呈现出不同的变化趋势,试验温度从350℃升高到650℃,CaMgAl-HTLs,ZnMgAl-HTLs类水滑石的平均脱氯效率先升高后下降随后又略有回升,峰值出现在450℃,分别为97.6%和96.8%,而FeMgAlHTLs类水滑石的平均脱氯效率随温度的升高不断减小,最大值出现在350℃,为94.1%.3种类水滑石中CaMgAl-HTLs吸附剂的综合性能最佳,脱氯效率在93%以上,FeMgAl-HTLs的性能最不稳定.
Three hydrotalcite-like compounds（ HTLs）,i. e.,CaMgAl-HTLs,ZnMgAl-HTLs,and FeMgAl-HTLs,were prepared by co-precipitation. The dechlorination performance of three HTLs on different initial concentrations of HCl,reaction temperatures,and reaction time conditions were studied,and the absorption mechanism was speculated by TGA（ thermo gravimetric analyzer）. The experimental results showthat the ideal HCl removal efficiencies（ over 86%） are achieved for all of the three HTLs under different conditions. The removal efficiencies of HCl first increase and then decrease followed by keeping constant with the increase of the reaction time. Meanwhile,the average removal efficiencies decrease with the increase of the initial concentrations of HCl. Moreover,with the increase of the temperatures from 350 ℃ to 650 ℃,the average HCl removal efficiencies for CaMgAl-HTLs and ZnMgAl-HTLs increase at first and then decrease but slightly rebound afterwards,and the peak values are both achieved at 450 ℃,with 97. 6% and 96. 8%,respectively.While for Fe Mg Al-HTLs,the average removal efficiency decreases with the increase of the temperature,and the peak value with 94. 1% is achieved at 350 ℃. Overall,in the three HTLs,ZnMg AlHTLs showbest performance on the removal efficiency of HCl（ over 93%）,and the performance of Fe Mg Al-HTLs is the worst unstable.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第4期782-787,共6页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51476032)
关键词
类水滑石
吸附剂
中高温
脱氯效率
hydrotalcite-like compounds
absorption
medium-high temperature
HCl removal efficiency
作者简介
胡春红（1990～），女，硕士生；
金保昇（联系人），男，教授，博士生导师，bsjin@seu．edu．cn
