文献类型：期刊文献

中文题名：甘蔗渣生物炭对水体铬吸附反应研究

英文题名：Study on Adsorption of Chromium by Bagasse Biochar

作者：刘成昊[1];林春岭[2];钟来元[1];李镇城[1];奉艺婕[1];赖飞鸿[1];朱颖佳[1]

机构：[1]广东海洋大学化学与环境学院,广东湛江524088;[2]广东海洋大学滨海农业学院,广东湛江524088

年份：2021

卷号：48

期号：8

起止页码：90

中文期刊名：广东农业科学

外文期刊名：Guangdong Agricultural Sciences

收录：CSTPCD

基金：国家自然科学基金(41371316);广东海洋大学大学生创新创业训练计划项目(CXXL2020030)。

语种：中文

中文关键词：甘蔗渣生物炭;Cr(Ⅲ)和Cr(Ⅵ);反应条件;吸附性能;吸附动力学

外文关键词：bagasse biochar;Cr(Ⅲ)and Cr(Ⅵ);reaction condition;adsorption performance;absorption kinetics

中文摘要：【目的】探究甘蔗渣生物炭对铬(Cr)的最佳吸附条件和吸附机理。【方法】在N2保护和350、450、550℃3种温度条件下制备甘蔗渣生物炭,通过扫描电镜(SEM)比较炭化前后甘蔗渣外观的变化,通过批量处理试验研究制备温度、用量、Cr初始质量浓度、吸附时间等因素对甘蔗渣生物炭吸附Cr(Ⅲ)和Cr(Ⅵ)的影响。【结果】甘蔗渣生物炭孔隙度随制备温度的升高而增大。制备温度越低,对Cr(Ⅵ)去除效率越高,当Cr(Ⅵ)质量浓度和炭用量分别为50 mg/L和15 g/L时,反应7 d后,350℃制备的生物炭对Cr(Ⅵ)的最大吸附量为5.703 mg/g,去除率可达92.39%;制备温度越高,对Cr(Ⅲ)去除效率越高,当Cr(Ⅲ)质量浓度和炭用量分别为75 mg/L和10 g/L时,反应7 d后,550℃制备的生物炭对Cr(Ⅲ)的最大吸附量为9.158 mg/g,去除率达97.06%。甘蔗渣生物炭对Cr吸附等温线可用Langmuir模型拟合,Cr(Ⅵ)和Cr(Ⅲ)吸附动力学曲线分别符合拟一级和拟二级反应动力学模型。【结论】不同温度下制备的甘蔗渣生物炭对不同价态Cr的吸附具有选择性,其中350℃制备的生物炭对Cr(Ⅵ)的吸附效率最高,而550℃制备的生物炭对Cr(Ⅲ)的吸附效率最高。

外文摘要：【Objective】The study aimed to explore the optimal conditions for adsorption of Cr by bagasse biochar and reveal the underlying mechanisms.【Method】Under the preservation of N2,three types of bagasse biochar were prepared with the temperature precisely controlled at 350,450 and 550℃,respectively.The changes in morphology of bagasse before and after carbonization were compared by using scanning electron microscope(SEM).The effects of preparation temperature,dosage of biochar,initial concentration of Cr and reaction time on the adsorption of Cr(Ⅲ)and Cr(Ⅵ)were investigated.【Result】The porosity of bagasse biochar expanded with the increase in preparation temperature.Bagasse biochar prepared at low temperature exhibited good efficiency for Cr(Ⅵ)removal,when the mass concentration of Cr(Ⅵ)and carbon dosage were 50 mg/L and 15 g/L,the maximum amount of adsorbed Cr(Ⅵ)by bagasse biochar prepared at 350℃was 5.703 mg/g after reaction for 7 d,with the removal rate of 92.39%.The bagasse biochar prepared at high temperature showed optimal efficiency for Cr(Ⅲ)removal rate.When the mass concentration of Cr(Ⅵ)and carbon dosage were 75 mg/L and 10 g/L,the maximum amount of adsorbed Cr(Ⅵ)by bagasse biochar prepared at 550℃was 9.158 mg/g after reaction for 7 d,with the removal rate of 97.06%.The adsorption isotherm of Cr obeyed the Langmuir model,and the kinetics curves of Cr(Ⅵ)and Cr(Ⅲ)fitted the pseudo-first-order kinetic model and pseudo-second-order kinetic model,respectively.【Conclusion】The efficiency of Cr(Ⅲ)and Cr(Ⅵ)removal was largely dependent on the temperature for biochar preparation.Based on the results above,the biochar prepared at 350℃showed optimal efficiency for Cr(Ⅵ)adsorption,and 550℃for Cr(Ⅲ)adsorption.