枣树枝改性生物炭对水溶液中锌离子的吸附性能研究
Adsorption of Zinc Ions in Aqueous Solution by Modified Biochar from Jujube Branch
陈冬素 1陈亮 1阎丽1
作者信息
- 1. 湖南省环境保护科学研究院,湖南 长沙 410004
- 折叠
摘要
通过水热碳化枣树枝生成水热炭,以氯化锌为活化剂对水热炭进行活化,得到枣树枝改性生物炭,所得生物炭表面具有丰富的孔结构及高度芳香化结构.以枣树枝改性生物炭为吸附剂吸附溶液中Zn2+,在吸附时间 80 min、溶液pH=9、改性生物炭投加量 700 mg/L、反应温度 55℃、Zn2+初始浓度 30 mg/L条件下,Zn2+去除率达到 99%以上;吸附过程与Freundlich吸附模型拟合度高,表明改性生物炭对Zn2+的吸附过程为多层分子吸附;改性生物炭经 5 次循环吸附与解吸后,对Zn2+去除率仍在 97%以上.
Abstract
Hydrothermal carbon generated by hydrothermal carbonization of waste jujube branches was activated with zinc chloride as an activator,and a kind of modified biochar was prepared with highly porous and aromatic structure on its surface,which was then used to adsorb Zn2+in aqueous solution.It is shown that for the solution with pH of 9 and initial Zn2+concentration of 30 mg/L,after 80 min adsorption at a temperature of 55 ℃ by adding 700 mg/L modified biochar,the removal rate of Zn2+therein exceeds 99％.The adsorption process is well-fitted to the Freundlich adsorption model,indicating that the adsorption process with the modified biochar is a multilayer molecular adsorption.The removal rate of Zn2+by the modified biochar,after 5 cycles of adsorption and desorption,can still remain over 97％.
关键词
废水处理/锌冶炼废水/枣树枝/生物质/生物炭/吸附剂/氯化锌/锌离子Key words
wastewater treatment/wastewater from metallurgical processing of zinc/jujube branches/biomass/biochar/adsorbent/zinc chloride/zinc ion引用本文复制引用
基金项目
湖南省科技创新计划项目(2021RC5030)
出版年
2024
NETL
NSTL
万方数据