摘要
以竹子为原料制备生物炭,研究温度、吸附时间、投加量等因素对生物炭去除水中氨氮性能的影响,并采用响应曲面法构建模型并进行优化,通过吸附动力学、吸附等温线研究生物炭对氨氮的吸附机理。结果表明:随着投加量、吸附时间及温度因素改变,生物炭对氨氮去除率先增后减;通过研究构建模型发现各因素对去除氨氮影响的显著性由大到小依次为:投加量>吸附时间>温度;最佳条件下,氨氮去除率为49.78%(理论预测值为51.24%),氨氮吸附过程为准二级动力学,符合Langmuir模型,说明生物炭表面的吸附位点较均匀分布,主要为化学反应。
In this study,bamboo was used as raw materials to prepare biochar,and the influence of temperature,adsorption time and dosage on the performance of biochar to remove ammonia nitrogen from water was studied,the response surface methodology was used to build the model and optimization.Adsorption kinetics and adsorption isotherms were used to study the adsorption mechanism of ammonia nitrogen by biochar.The results showed that with the change of dosage,adsorption time and temperature,the removal of ammonia nitrogen by biochar firstly increased and then decreased.Response surface methodology was adopted to build the model,and it was found that dosage had a significant effect on ammonia nitrogen removal,and the order of the significance of the effect was as follows:dosage>adsorption time>temperature.Under the optimal conditions,the actual removal rate was 49.78%(the theoretical predicted value was 51.24%),which proved the feasibility of response surface methodology in this experiment.This experiment was quasi-second-order kinetics,which was more consistent with Langmuir model,indicating that the adsorption sites on the surface of biochar were evenly distributed and mainly chemical reactions.
作者
李济源
曹文平
陈国浩
赵静茹
LI Ji-yuan;CAO Wen-ping;CHEN Guo-hao;ZHAO Jing-ru(College of Civil Engineering and Architecture,Anhui Polytechnic University,Wuhu 241000,China;School of Environmental Engineering,Xuzhou Institute of Technology,Xuzhou 221008,China;Key Laboratory of Fine Chemicals for Petroleum and Natural Gas,College of Chemistry and Chemical Engineering,Urumchi 830046,China)
出处
《环境科技》
2022年第3期7-12,共6页
Environmental Science and Technology
基金
国家自然科学基金(51808001)
安徽省自然科学基金资助项目(1808085QE146)
安徽工程大学科学研究预研项目(XJKY2020168)
安徽工程大学校级大学生科研项目(2021DZ36)
安徽省高校自然科学研究项目(KJ2021A0505)。
关键词
生物炭
氨氮
响应曲面法
优化
机理
Biochar
Ammonia nitrogen
Response surface method
Optimization
Mechanism
作者简介
李济源(1986-),男,河南新乡人,硕士,讲师,主要研究方向为水处理技术等.
