摘要
采用氧化钙对高岭土进行改性,并用XRD、SEM和FT-IR对改性高岭土进行了表征。将改性高岭土应用于垃圾渗滤液的处理,考察了改性高岭土投加量、渗滤液初始pH、时间等因素对氨氮去除效果的影响,并对其吸附机理进行了研究。结果表明,氧化钙改性高岭土的产物主要是胶凝材料水化物(硅铝酸钙和含Al的C-S-H凝胶),形貌为蜂窝状;向氨氮含量为3520mg/L、pH为7.53~7.80的垃圾渗滤液中投加160g/L吸附剂,吸附60min,氨氮的去除率达82.66%,吸附量为18.19mg/g。氧化钙改性高岭土对氨氮的吸附符合Langmuir等温模型,动力学上符合准二级动力学方程,其相关系数分别为0.9678,0.9989。同时,该吸附过程包含了膜扩散和颗粒内扩散。
The calcium oxide modified kaolin was characterized by XRD,SEM,FT-IR,and applied in landfill leachate treatment. The effects of the dosage,the initial solution p H,adsorption time on the removal of ammonia nitrogen,as well as the adsorption mechanism were discussed. The results showed that the main products of calcium oxide modified kaolin is cementitious material hydrate（calcium silicoaluminate and Al-containing C-S-H）,and its shape is a honeycomb. The removal efficiencies of 160 g/L adsorbent to landfill leachate with 3520 mg/L ammonia,p H 7. 53 ~ 7. 80 can reach 82. 6%,the adsorption capacity was 18. 2 mg/g after absorbed 60 minutes. The equilibrium isotherm and kinetics models showed that the adsorption of ammonia by calcium oxide modified kaolin agrees with Langmuir equation and quasi-second-order equation well,and the correlation coefficients are 0. 9723,0. 9989,and the adsorption progress includes intra-particle diffusion and the boundary layer diffusion.
出处
《化学通报》
CAS
CSCD
北大核心
2017年第1期99-103,共5页
Chemistry
关键词
氧化钙
改性高岭土
垃圾渗滤液
氨氮
去除
Calcium oxide
Modified kaolin
Landfill leachate
Ammonia nitrogen
Removal
