水蒸气对高岭土高温吸附铅的影响  

Effect of water vapor on lead adsorption by kaolinite at high temperatures

作　　者：程运 吕文婷 贾纪强 张基栋 卜昌盛 张居兵[1] 王昕晔 CHENG Yun;L Wen-ting;JIA Ji-qiang;ZHANG Ji-dong;BU Chang-sheng;ZHANG Ju-bing;WANG Xin-ye(Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control,School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing210023,China;Hefei Cement Research&Design Institute corporation Ltd.,Hefei230051,China;Jiangsu Shiqing Environmental Technology Co.,Ltd.,Nanjing210012,China;Everbright Ecological Environment Design and Research Institute Co.,Ltd.,Nanjing211100,China)

机构地区：[1]南京师范大学能源与机械工程学院,江苏省物质循环与污染减排重点实验室,江苏南京210023 [2]合肥水泥研究设计院有限公司,安徽合肥230051 [3]江苏世清环保科技有限公司,江苏南京210012 [4]光大生态环境设计研究院有限公司,江苏南京211100

出　　处：《燃料化学学报》2020年第11期1327-1334,I0003,共9页Journal of Fuel Chemistry and Technology

基　　金：国家重点研发计划(2018YFB0605102);国家自然科学基金(51706106);江苏省重点研发计划(SBE2019740303)资助。

摘　　要：使用沉降炉开展了水蒸气对高岭土高温吸附铅影响的实验研究,其中铅的形态为PbO和PbCl 2两种。首先研究了0-20%水蒸气对高岭土吸附PbO(1100-1300℃)和PbCl 2(800-1300℃)的影响规律,然后基于XRD、SEM和残余羟基率等分析,掌握了水蒸气影响高岭土高温吸附的机理。结果表明,水蒸气可以减少高岭土表面羟基的高温脱落,从而阻碍了PbO吸附、促进了PbCl 2吸附。综合高温下惰性莫来石的出现和高岭土孔隙结构的坍塌等因素,PbO和PbCl 2的最佳吸附温度分别为1200和1000℃。The effect of water vapor on lead adsorption by kaolinite at high temperatures was studied using a drop tube furnace.The lead was in the forms of PbO and PbCl2.Firstly,effect of 0-20%water vapor was studied on adsorption of PbO(1100-1300℃)and PbCl2(800-1300℃)by kaolinite.Then,mechanism of high-temperature adsorption of kaolin was revealed according to the analysis of XRD,SEM and residual hydroxyl group fraction.The results showed that water vapor reduced the loss of hydroxyl groups on kaolinite surface at high temperatures,hindering PbO adsorption and promoting PbCl2 adsorption.At the same time,due to production of inert mullite and collapse of pore structure of kaolinite at high temperatures,the optimal adsorption temperatures of PbO and PbCl2 were 1200 and 1000℃,respectively.

关 键 词：高岭土 铅 吸附 高温 水蒸气 

分 类 号：X513[环境科学与工程—环境工程]