毛豆壳生物炭的活化及其对甲萘威的吸附性能  

Activation of soybean shell biochar and its adsorption performance for carbaryl

作　　者：韩静 朱依婷 郑驰 马莉红 张亚男 曾秋艳 刘书亮[1] 陈姝娟[1] HAN Jing;ZHU Yiting;ZHENG Chi;MA Lihong;ZHANG Yanan;ZENG Qiuyan;LIU Shuliang;CHEN Shujuan(College of Food Science,Sichuan Agricultural University,Ya an 625014,Sichuan,China)

机构地区：[1]四川农业大学食品学院,四川雅安625014

出　　处：《浙江农业学报》2023年第9期2202-2211,共10页Acta Agriculturae Zhejiangensis

基　　金：国家重点研发计划(2019YFC1605302)。

摘　　要：以KOH为活化剂,优化毛豆壳活化生物炭(A-SBC)的制备条件,研究不同体系对A-SBC吸附甲萘威的影响,分析A-SBC对甲萘威的吸附动力学、热力学特性,以期为实现毛豆壳的资源化利用和控制甲萘威农药的环境污染提供理论依据和技术支撑。结果表明:将毛豆壳在700℃、1 h预碳化后,与KOH按1∶2.0的质量比混合,在750℃、1.5 h的条件下活化,获得的A-SBC对甲萘威的吸附性能最佳,吸附率达89.63%,吸附容量为113.28 mg·g^(-1)。与未经活化的毛豆壳生物炭相比,A-SBC的表面凹陷,孔隙密集,有机官能团减少。当体系pH为2.0~6.5时,A-SBC对甲萘威的吸附良好,并在pH值为5.5时吸附容量最大;A-SBC对甲萘威的吸附随温度升高而增多,在离子强度(NaCl)为0.01 mol·L^(-1)时吸附容量最大。A-SBC对甲萘威的吸附更符合准二级动力学模型,等温吸附曲线更适于用朗缪尔(Langmuir)方程拟合,说明其以化学吸附为主。吸附热力学结果表明,A-SBC对甲萘威的吸附由疏水作用主导,是自发的吸热反应。A-SBC对甲萘威的吸附性能优良,可为去除水体环境中的甲萘威污染提供新途径与新材料。In order to provide theoretical basis and technical support for the utilization of soybean shell and the control of environmental pollution of carbaryl,KOH was used as activator to optimize the preparation conditions of soybean shell activated biochar(A-SBC).The effects of different systems on the adsorption capacity of A-SBC for carbaryl were studied.The adsorption kinetics and adsorption thermodynamics of carbaryl by A-SBC were analyzed.The results showed that the A-SBC obtained by pre-carbonizing the soybean shell at 700℃for 1 h,mixed with KOH at a mass ratio of 1∶2.0,and activation at 750℃for 1.5 h exhibited the best adsorption performance for carbaryl.The adsorption rate and adsorption capacity were 89.63%and 113.28 mg·g^(-1),respectively.After activation,the surface of A-SBC was concave,the pores were dense,and the organic functional groups wre reduced.When the pH of the system was 2.0-6.5,the adsorption performance of A-SBC was good,and the maximum adsorption capacity was recorded at the pH value of 5.5.The adsorption capaticy increased with the elevated temperature.The maximium adsorption capacity was found when the ionic strength(NaCl)was 0.01 mol·L^(-1).The adsorption of carbaryl by A-SBC was more consistent with the quasi second-order dynamic model.The isothermal adsorption curve was more suitable to be fitted by Langmuir equation,which indicated that this process was mainly chemical adsorption.Thermodynamics test results showed that the adsorption of carbaryl by A-SBC was dominated by hydrophobic interaction and was a spontaneous endothermic reaction.The adsorption performance of A-SBC for carbaryl was excellent,which could provide new ways and new materials for removing carbaryl in water environment.

关 键 词：生物炭 碱活化 甲萘威 吸附 

分 类 号：S609.9[农业科学—园艺学] X592[环境科学与工程—环境工程]