摘要
以氯化亚铁(FeCl_2·4H_2O)和硫化钠(Na_2S·9H_2O)为原料,经化学共沉淀法合成纳米FeS,并用壳聚糖对纳米FeS进行表面改性处理,研究了壳聚糖用量对FeS-CTS粒径、Zeta电位和稳定性的影响,以及溶液pH、吸附时间、Sb(V)初始浓度和共存阴离子等因素对FeS-30%CTS吸附Sb(V)效果的影响。结果发现:壳聚糖用量为30%时的纳米FeS分散性较好,满足纳米吸附材料原位处理地下水需要的迁移性要求;pH对FeS-30%CTS吸附水中Sb(V)的过程影响较小,共存阴离子中PO^(3-)_4 对吸附过程影响最明显;FeS-CTS吸附Sb(V)的过程符合拟二级吸附动力学模型,属于化学吸附过程,同时符合Freundlich等温线,属于多分子层吸附。
Nano FeS was synthesized by chemical coprecipitation method with ferrous chloride(FeCl2·4 H2O) and sodium sulfide(Na2S·9 H2O), and was subjected to surface modification treatment with chitosan. The effects of chitosan dosage on particle size, Zeta potential and stability of FeS-CTS, and the effects of pH of solution, adsorption time, initial Sb(V) concentration, coexisting anion and other factors on Sb(V) adsorption effect of FeS-30%CTS were investigated in this study. The results revealed that when chitosan dosage was 30%, nano FeS had good dispersibility, which satisfied the mobility requirement of in-situ treatment of groundwater with nano-adsorption materials; the influences of pH on adsorption process of FeS-30%CTS to Sb(V) in water was little, but that of PO3-4-P of coexisting anion on adsorption process was significant; the adsorption process accorded with pseudo-two-order kinetics model, so it is a chemical adsorption process, meanwhile, the adsorption process accorded with the Freundlich isotherm model, so it could also be defined as the multi-layer adsorption.
作者
向香源
黄阳
冯启明
刘冬雪
韦梦雪
XIANG Xiang-yuan;HUANG Yang;FENG Qi-ming;LIU Dong-xue;WEI Meng-xue(School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Mianyang 621010,China)
出处
《环境工程》
CAS
CSCD
北大核心
2018年第12期87-92,102,共7页
Environmental Engineering
基金
固体废物处理与资源化教育部重点实验室专职科研创新团队建设基金项目"火山灰质工业废渣深加工及高值化利用关键技术"(14tdgk04)
关键词
壳聚糖
纳米FeS
原位修复
除锑
chitosan
nano FeS
in-situ repair
antimony removal
