磷酸活化文冠果果壳生物炭及其对亚甲基蓝的吸附性能  

Preparation of Xanthoceras sorbifolia Bunge shell biochar activated by phosphoric acid and its adsorption performance for methylene blue

作　　者：陈燕勤 王雪莉 宋世方 刘尊奇[1,2] CHEN Yan-qin;WANG Xue-li;SONG Shi-fang;LIU Zun-qi(College of Chemistry and Chemical Engineering,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;Xinjiang Key Laboratory of Agricultural Chemistry and Biomaterials,Urumqi,Xinjiang 830052,China)

机构地区：[1]新疆农业大学化学化工学院,新疆乌鲁木齐830052 [2]新疆农业化学与生物材料重点实验室,新疆乌鲁木齐830052

出　　处：《食品与机械》2023年第5期1-8,共8页Food and Machinery

基　　金：国家自然科学基金项目(编号:21066013);新疆维吾尔自治区重大科技专项(编号:2017A03005-5)。

摘　　要：目的:探究文冠果相关产业废弃物处置方法。方法:以文冠果果壳为原料,磷酸为活化剂,在单因素试验基础上,采用Box-Behnken中心组合设计进行生物炭制备条件优化,并将最优制备条件下所得生物炭用于吸附水体中亚甲基蓝,通过考察吸附影响因素,确定磷酸活化制备的文冠果果壳生物炭对亚甲基蓝的吸附特性,并结合动力学分析探讨其吸附机理。结果:磷酸活化制备文冠果果壳生物炭的最优工艺条件为浸渍比(m果壳粉∶m磷酸溶液)1∶21,热解温度530℃,热解时间75 min。文冠果果壳生物炭吸附水体中亚甲基蓝最优条件为溶液初始pH 12.6,生物炭投加量1.0 g/L,亚甲基蓝初始质量浓度200 mg/L,吸附平衡时间120 min。文冠果果壳生物炭对水体中的亚甲基蓝吸附服从准二级反应动力学关系,吸附过程由液膜扩散控制、孔隙扩散控制和吸附解析平衡3个阶段组成。结论:磷酸活化可显著提升文冠果果壳生物炭比表面积和孔容,进而显著提升其对亚甲基蓝的吸附性能。Objective:The adsorption performance and mechanism of Xanthoceras sorbifolia shell biochar activated by phosphoric acid for methylene blue was investigated in this study.Methods:With phosphoric acid as activator,the Box-Behnken center combination design was used to optimize the preparation conditions of biochar from Xanthoceras sorbifolia shell.The biochar obtained under the optimal preparation conditions was used to adsorb methylene blue in water.Through investigating the adsorption influencing factors,the adsorption characteristics of biochar on methylene blue were determined,and combined with the analysis of kinetic,the adsorption mechanism was discussed.Results:The optimum technological conditions for preparing biochar from Xanthoceras sorbifolia pericarp by phosphoric acid activation were as follows:impregnation ratio(m Pericarp powder∶m Phosphoric acid solution)1∶21,pyrolysis temperature 530℃and pyrolysis time 75 min.The optimal conditions for adsorption of methylene blue in water by sorbent biochar from Xanthoceras sorbifolia shell are as follows:initial pH of solution 12.6,dosage of biochar 1.0 g/L,initial mass concentration of methylene blue 200 mg/L,and adsorption equilibrium time 120 min.The adsorption of Xanthoceras sorbifolia shell biochar on methylene blue in water obeys the quasi second order reaction kinetics.The adsorption process consists of three stages:liquid film diffusion control,pore diffusion control and adsorption desorption equilibrium.Conclusion:Phosphoric acid activation can significantly increase the specific surface area and pore volume of sorbent biochar from Xanthoceras sorbifolia sheell,thereby significantly improving its adsorption capacity for methylene blue.

关 键 词：生物炭 文冠果 果壳 磷酸活化 制备工艺 吸附性能 

分 类 号：X703[环境科学与工程—环境工程]