摘要
通过批量吸附实验对单宁-聚乙烯亚胺(TAP)吸附Cr(Ⅵ)的性能进行研究。结果表明,TAP对Cr(Ⅵ)的吸附受p H影响显著,当温度为60℃、溶液初始质量浓度为200 mg/L、p H为3时,其吸附量为73.96 mg/g。TAP对Cr(Ⅵ)的吸附行为符合Langmuir等温吸附模型和准二级动力学模型,吸附过程为吸热反应。利用SEM、FT-IR和XPS对吸附前后的TAP进行表征,结果表明,该吸附剂对Cr(Ⅵ)的吸附机制主要以化学还原与螯合作用为主,吸附剂上的—OH和—NH_(2)基团参与了反应。
Tannin-polyethylenimine(TAP),a new adsorbent,is prepared.The adsorption properties of TAP to Cr(Ⅵ)in aqueous solution is investigated through batch adsorption experiments.Results show that the adsorption behavior of TAP to Cr(Ⅵ)is significantly affected by p H value.The adsorption capacity of TAP to Cr(Ⅵ)reaches 73.96 mg·g-1 when the temperature remains at 60℃,initial concentration of Cr(Ⅵ)in the solution is 200 mg·L-1 and p H=3.0.The adsorption behavior accords with Langmuir model and pseudo-second-order model,and thermodynamic analyses implies that the adsorption of Cr(Ⅵ)by TAP is an endothermic reaction.SEM,FT-IR and XPS are utilized to characterize TAP before and after adsorbing Cr(Ⅵ).It is shown that the adsorption mechanism of Cr(Ⅵ)by TAP exhibits mainly chemical reduction and chelation,and the—OH and—NH_(2)groups on TAP involve in the adsorption process.
作者
蒋文艳
莫磊兴
王天顺
廖洁
陈伟
王彦力
邢钇浩
JIANG Wen-yan;MO Lei-xing;WANG Tian-shun;LIAO Jie;CHEN Wei;WANG Yan-li;XING Yi-hao(Agro-Products Quality Safety and Testing Technology Research Institute,Guangxi Academy of Agricultural Sciences,Nanning 530007,China;Germplasm Bank,Guangxi Academy of Agricultural Sciences,Nanning 530007,China)
出处
《现代化工》
CAS
CSCD
北大核心
2021年第8期133-138,共6页
Modern Chemical Industry
基金
广西自然科学基金(2020GXNSFAA259051)
广西农业科学院科技发展基金项目(桂农科2020YM98,桂农科2020YM21)
广西农业科学院基本科研业务专项团队项目(桂农科2015YT92)。
