Box-Behnken设计优化制备高比表面积柚皮基生物炭及其亚甲基蓝吸附机理  

Optimized preparation of high specific surface area pomelo peel-based biochar by Box-Behnken design and its methylene blue adsorption mechanism

作　　者：宋永伟[1,2] 罗浩伟 杨俊[1,2] 郭泽浩 王鹤茹 申祖武 SONG Yong-wei;LUO Hao-wei;YANG Jun;GUO Ze-hao;WANG He-ru;SHEN Zu-wu(Department of Environmental Science and Engineering,Zhongnan University of Economics and Law,Wuhan 430073,China;Institute of Environmental Management and Policy,Zhongnan University of Economics and Law,Wuhan 430073,China;Laboratory Centre for Safety and Environment,Zhongnan University of Economics and Law,Wuhan 430073,China;Modern Technology Convergence and Engineering Management Research Center,Zhongnan University of Economics and Law,Wuhan 430073,China)

机构地区：[1]中南财经政法大学环境科学与工程系,湖北武汉430073 [2]中南财经政法大学环境管理与政策研究所,湖北武汉430073 [3]中南财经政法大学安全与环境实验中心,湖北武汉430073 [4]中南财经政法大学现代技术融合与工程创新研究中心,湖北武汉430073

出　　处：《中国环境科学》2023年第12期6363-6373,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(21906183);中南财经政法大学中央高校基本科研业务费专项资金(2722023DK054,2722023DK061)。

摘　　要：以柚子皮为非传统前驱体,采用ZnCl2一步炭化-活化法制备柚皮基生物炭(PPBC).通过Box-Behnken设计(BBD)研究了活化温度(x_(1))、浸渍比(x_(2))、活化时间(x_(3))三个关键制备变量对PPBC亚甲基蓝吸附值的影响.结果表明,影响亚甲基蓝吸附值的单因素显著性为x_(3)>x_(1)>x_(2),交互项显著性为x_(1)x_(3)>x_(2)x_(3)(x_(1)x_(2)项影响不显著).在活化温度924℃、浸渍比4、活化时间133min的最佳制备条件下,模型预测的亚甲基蓝最大吸附值为216.80mg/g,实验值为215.69mg/g(超过国家木质净水用活性炭一级品标准135mg/g),两者吻合程度较好,说明构建的响应面模型可以很好地优化PPBC制备工艺.此外,利用BET、SEM、FTIR等分析了最佳条件下制备PPBC的理化性质并探究了其对亚甲基蓝的吸附机理.PPBC表面含有丰富且不均匀的纳米级孔隙,比表面积高达1222.40m^(2)/g,其对亚甲基蓝的吸附主要通过孔隙填充、静电作用、π-π堆积相互作用及氢键的协同作用.PPBC具有作为生物质吸附剂处理亚甲基蓝染料废水的潜力.Pomelo peel was used as a non-traditional precursor to prepare pomelo peel-based biochar(PPBC)by one-step carbonization-activation method.The effect of three crucial preparation variables,activation temperature(x_(1)),impregnation ratio(x_(2)),and activation time(x_(3)),on the methylene blue adsorption value was investigated by Box-Behnken design(BBD).The results showed that the significance of the single factor affecting the methylene blue adsorption value was x_(3)>x_(1)>x_(2),and the interactive item was x_(1)x_(3)>x_(2)x_(3)(the x_(1)x_(2) item was not significant).Under the optimum preparation conditions of activation temperature of 924°C,impregnation ratio of 4 and activation time of 133 min,the maximum methylene blue adsorption value predicted by the model was 216.80 mg/g,and that of the experimental value was 215.69 mg/g.Both of them were in good agreement with each other,which indicated that the constructed response surface model could optimize the preparation process of PPBC very well.In addition,the physicochemical properties of PPBC prepared under optimal conditions were analyzed by BET,SEM,and FTIR,and the adsorption mechanisms of methylene blue were investigated.The surface of PPBC contained abundant and heterogeneous pores with a specific surface area as high as 1222.40m^(2)/g,and its adsorption of methylene blue was mainly through the synergistic effects of pore filling,electrostatic interaction,π-πstacking interaction,and hydrogen bonding.PPBC has the potential as a biosorbent for the treatment of methylene blue dye wastewater.

关 键 词：BOX-BEHNKEN设计 优化制备 柚皮基生物炭 亚甲基蓝 吸附 

分 类 号：X703[环境科学与工程—环境工程]