稻草秸秆生物炭的化学改性及其吸附Cr(Ⅵ)的研究  

Modification of rice straw biochar and its adsorption for Cr(Ⅵ)

作　　者：王雪扬 许汝力 张钱丽[1] WANG Xueyang;XU Ruli;ZHANG Qianli(School of Chemistry and Life Sciences,SUST,Suzhou 215009,China)

机构地区：[1]苏州科技大学化学与生命科学学院,江苏苏州215009

出　　处：《苏州科技大学学报（自然科学版）》2021年第4期67-71,共5页Journal of Suzhou University of Science and Technology（Natural Science Edition）

基　　金：国家自然科学基金资助项目(20905055)。

摘　　要：以稻草秸秆为原料,在无氧条件下高温热解制备生物炭,并用N-N-二乙基乙胺和二亚乙烯三胺对制备的生物炭进行交联改性,研究其对Cr(Ⅵ)的吸附性能。研究结果表明,稻草秸秆生物炭经交联改性后,对Cr(Ⅵ)的吸附性能有了明显改善,在25 mL浓度为100 mg·L^(-1)的Cr(Ⅵ)溶液(pH=4.0,25℃)中,投入0.050 g吸附剂,吸附30 min,吸附率可达95.15%。吸附过程符合准二级动力学方程,吸附等温模型为Langmiur吸附,为单分子层吸附,吸附剂循环利用3次,吸附性能保持在90%以上。With rice straw as the raw material,biochar was prepared by high temperature pyrolysis under anaero-bic conditions.The prepared biochar was cross-linked and modified with N-N-diethylethylamine and diethy-lenetriaminefor the investigation of its adsorption performance for Cr(Ⅵ).0.050 g adsorbent added into 25 mL 100 mg·L^(-1) Cr(Ⅵ)solution(pH=4.0,25℃),the adsorption rate can reach 95.15%after 30 min.After cross-linking modification,the adsorption performance of straw biochar for Cr(Ⅵ)is greatly improved.The adsorption process conforms to the quasi-second-order kinetic equation,and the adsorption isotherm model is Langmiur adsorption which is mono-layer adsorption.The adsorption performance can keep over 90%after the adsorbent is recycled 3 times.

关 键 词：稻草秸秆 生物炭 交联改性 吸附 Cr(Ⅵ) 

分 类 号：O657.14[理学—分析化学]