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

作　　者：陈冬素 陈亮[1] 阎丽[1] CHEN Dongsu;CHEN Liang;YAN Li(Hunan Research Academy of Environmental Sciences,Changsha 410004,Hunan,China)

机构地区：[1]湖南省环境保护科学研究院,湖南长沙410004

出　　处：《矿冶工程》2024年第3期130-134,共5页Mining and Metallurgical Engineering

基　　金：湖南省科技创新计划项目(2021RC5030)。

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Zn^(2+),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℃、Zn^(2+)初始浓度30 mg/L条件下,Zn^(2+)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Zn^(2+)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Zn^(2+)去除率仍在97%以上。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 Zn^(2+)in aqueous solution.It is shown that for the solution with pH of 9 and initial Zn^(2+)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 Zn^(2+)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 Zn^(2+)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 

分 类 号：X703[环境科学与工程—环境工程]