氯化锌改性甘蔗渣生物质炭对Cr(Ⅵ)的吸附研究  

Study on the Adsorption of Cr(VI)by Zinc Chloride Modified Sugarcane Bagasse Biochar

作　　者：王亚伟[1] 陈双莉[1] Wang Yawei;Chen Shuangli(School of Chemistry and Chemical Engineering,Xian University of Architecture and Technology,Xian 710055,China)

机构地区：[1]西安建筑科技大学化学与化工学院,陕西西安710055

出　　处：《广东化工》2024年第6期34-37,44,共5页Guangdong Chemical Industry

基　　金：陕西省大学生创新创业训练项目(S20220701091);陕西省重点研发计划一般项目(社会发展领域)(2020SF-364)。

摘　　要：以甘蔗渣为原料,采用氯化锌改性的方法,制备新型改性生物质炭并用作吸附剂去除水体中的Cr(Ⅵ)。采用SEM、FTIR对改性前后的生物质炭表面结构、孔径、比表面积和表面官能团进行了表征。通过初始浓度、吸附剂用量、温度、时间和pH值五组单因素控制实验,确定了最佳吸附条件,探讨了各种因素对吸附效果的影响。实验结果表明,在改性生物质炭用量为2 g·L^(-1),35℃,pH2.0左右,吸附时间120 min,铬离子初始浓度为100 mg·L^(-1)的时候吸附效果最好,吸附量45.64 mg·g^(-1),去除率可达91.64%。该生物质炭对Cr(VI)的吸附符合Langmuir等温吸附模型,吸附过程符合准二级动力学方程。A new type of modified biochar was prepared from bagasse by Zinc Chloride modification which was used as an adsorbent to remove Cr(Ⅵ)from water.Scanning electron microscope(SEM)and Fourier Transform infrared spectroscopy(FTIR)were used to characterize the surface structure,aperture,specific surface area and surface functional groups of biomass charcoal before and after modification.The optimal adsorption conditions were determined and the influence of various factors on the adsorption effect was explored through five sets of single-factor control experiments including initial concentration,dosage of adsorbent,temperature,time and pH value.The results showed when the dosage of modified biochar was 2 g·L^(-1),temperature was 35℃,pH was 2.0,adsorption time was 120 min,and the initial mass concentration of Cr(Ⅵ)was 100 mg·L^(-1),the adsorption capacity of Cr(Ⅵ)was 45.64 mg·g^(-1),and the Cr(Ⅵ)removal rate reached 91.64%.The adsorption of Cr(Ⅵ)by biochar conforms to Langmuir isothermal adsorption model,the adsorption process conforms to the quasi-second-order kinetic equation.

关 键 词：甘蔗渣 生物质炭 Cr(Ⅵ) 吸收 改性 

分 类 号：TQ35[化学工程] TQ424