姜沛汶, 李晗晟, 邓天天, 等.响应面法优化制备La-Biochar复合材料及其对As（Ⅲ）的吸附研究[J].河南理工大学学报（自然科学版）,2023,42(1):76-86.

JIANG P W, LI H S, DENG T T,,et al.Optimization design of La-Biochar composites by response surface methodology and its adsorption properties to As（Ⅲ）[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(1):76-86.

响应面法优化制备La-Biochar复合材料及其对As（Ⅲ）的吸附研究

姜沛汶, 李晗晟, 邓天天, 刘千源, 马超

河南工程学院 环境与生物工程学院，河南 郑州 451191

摘要:为优化La-Biochar复合材料（La-B）制备工艺，以玉米秸秆和氯化镧为原料，As（Ⅲ）吸附量和去除率为响应指标，采用Box-Behnken Design（BBD）响应面法研究制备条件，系统考察吸附剂投加量和pH对吸附效果影响，并探究其吸附动力学和吸附热力学特性。结果表明：（1）La-B最佳制备条件为炭化时间120 min，物料比30%，炭化温度750 ℃，NaOH添加量0.5 g；（2）pH=10，吸附剂用量0.1 g时，La-B对20 mg/L的As（Ⅲ）溶液吸附效果最佳，此时As（Ⅲ）去除率达99.01%；（3）As（Ⅲ）等温吸附过程可用Freundlich模型描述，吸附过程遵循准二级扩散动力学模型；（4）La-B对As（Ⅲ）的吸附在高温条件下为自发的吸热反应过程。

关键词:La-Biochar复合材料;响应面法;As（Ⅲ）;吸附

doi:10.16186/j.cnki.1673-9787.2021010018

基金项目:河南省重点研发与推广专项（科技攻关）项目（192102310505）；河南工程学院博士培育基金资助项目（DKJ2018013）

收稿日期:2021/01/05

修回日期:2021/03/11

出版日期:2023/01/25

Optimization design of La-Biochar composites by response surface methodology and its adsorption properties to As（Ⅲ）

JIANG Peiwen, LI Hansheng, DENG Tiantian, LIU Qianyuan, MA Chao

College of Environmental and Biological Engineering， Henan University of Engineering，Zhengzhou 451191，Henan，China

Abstract:Taking the adsorption capacity of As（Ⅲ） as the index，the optimization of the preparation process of La-Biochar composites （La-B） was carried out by Box-Behnken Design（BBD） response surface methodology.The effects of La-B dosage and pH value were investigated，the adsorption kinetics and adsorption thermodynamics were also studied.The results showed that the optimal preparation conditions of La-B were：carbonization time of 120 min，material ratio of 30%，carbonization temperature of 750 ℃ and NaOH addition of 0.5 g.The optimum adsorption conditions of 20 mg/L As（Ⅲ） solution were obtained as follows：pH of 10 and adsorbent dosage of 0.1 g.The removal rate of As（Ⅲ） reached 99.01% under the optimal condition.In addition，the results of adsorption thermodynamics and adsorption kinetics experiments showed that the adsorption process could fit with Freundlich model and intra particle diffusion mode，separately.The thermodynamic parameters indicated that this adsorption was a spontaneous endothermic reaction at high temperature.

Key words:La-Biochar composite;response surface methodology;As（Ⅲ）;adsorption

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