核桃青皮改性活性炭对锌离子的吸附研究
Study on adsorption of zinc ions by modified activated carbon from walnut green peel
张少飞 1王文蕊 1燕翔 1王荣民 2聂龙英 1余洁1
作者信息
- 1. 陇南师范高等专科学校 农林技术学院,甘肃 陇南 742500
- 2. 生态环境相关高分子材料教育部重点实验室,甘肃 兰州 730070;西北师范大学 化学化工学院,甘肃 兰州 730070
- 折叠
摘要
陇南市拥有大量的锌矿和锌冶炼厂,并且拥有大量的核桃青皮资源,基于活性炭对锌离子的吸附作用,本文在不同温度下对核桃青皮进行了炭化,并利用NaCl、HCl和NaOH进行改性,然后考察了不同条件下改性核桃青皮活性炭对含锌废水中锌离子的吸附作用.分析结果表明,500℃条件下炭化的核桃青皮具有最好的吸附性能,记为WP-500;NaOH对WP-500 改性效果较好,对锌离子的吸附性能最强,改性后的活性炭记为WP3-500;在WP3-500 用量4g/L、温度 30℃、时间 30 min的条件下,WP3-500 对锌离子的去除率为81.11%,吸附量为10.14 mg/g;动力学分析表明,准一级动力学模型可以描述WP3-500 对锌离子的吸附行为,其主要受物理吸附控制;相较于玉米秸秆、花生壳和稻壳等废弃生物炭化制备吸附剂,利用核桃青皮制备活性炭的方法更简单、成本更低,而且对锌离子的去除效果更好.本研究为核桃青皮的资源化利用及废水中锌离子的去除提供了新思路.
Abstract
Longnan City has a large number of zinc mines and zinc smelters,and has a large number of walnut green peel resources.Based on the adsorption of zinc ions by activated carbon,in this paper,walnut green peel was carbonized at different temperatures,the activated carbon was modified by NaCl,HCl and NaOH,and the adsorption effect of modified activated carbon on zinc ions in wastewater containing zinc was investigated under different conditions.The results showed that the walnut green peel carbonized at 500℃had the best adsorption property,which was denoted as WP-500.WP-500 modified by NaOH had the strongest adsorption capacity for zinc ions,and the modified activated carbon was denoted as WP3-500.When the dosage of WP3-500 was 4 g/L,the temperature was30℃,and the time was30min,the removal rate of WP3-500 for zinc ions was81.11%,and the adsorption capacity was 10.14 mg/g.The results of kinetic analysis show that the quasi-first-order kinetic model can describe the adsorption behavior of WP3-500 on zinc ions,which is mainly controlled by physical adsorption.Compared with the preparation of adsorbents from waste biological materials such as corn straw,peanut husk and rice husk,the preparation of activated carbon from walnut green peel is simpler and cheaper,and the removal effect of zinc ions is better.This study provides a new idea for the resource utilization of walnut green peel and the removal of zinc ions from wastewater.
关键词
核桃青皮/炭化/活性炭/吸附/含锌废水/锌离子/制备成本Key words
walnut green peel/carbonization/activated carbon/adsorption/zinc wastewater/zinc ion/preparation cost引用本文复制引用
基金项目
陇南市科技计划项目(2022-S·QKJ-04)
甘肃省科技计划项目(20JR5RK623)
陇南市社会化出资科技计划项目(2021-SZ-09)
陇南师范高等专科学校博士科研启动基金项目()
出版年
2024
NETL
NSTL
万方数据