杨帆,李欢,王幼奇,白一茹,夏红军,钟艳霞.四乙烯五胺改性生物质炭对水中锌(II)的吸附性能研究[J].环境科学学报,2020,40(2):527-535
四乙烯五胺改性生物质炭对水中锌(II)的吸附性能研究
- Adsorption properties of zinc (II) in aqueous solution by two pristine and tetraethylenepentamine modified biochars
- 基金项目：宁夏回族自治区重点研发计划重大项目（No.2018BFG02016）；国家自然科学基金（No.41867003，41761049）；宁夏高等学校项目（No.NGY2017015）；宁夏自然科学基金项目（No.2018AAC03027）；河南省高等学校重点科研项目（No.18B150030）
- 杨帆
- 1. 宁夏大学资源环境学院, 银川 750021;2. 宁夏大学, 旱区特色资源与环境治理教育部国际合作联合实验室, 银川 750021
- 王幼奇
- 1. 宁夏大学资源环境学院, 银川 750021;2. 宁夏大学, 旱区特色资源与环境治理教育部国际合作联合实验室, 银川 750021
- 白一茹
- 1. 宁夏大学资源环境学院, 银川 750021;2. 宁夏大学, 旱区特色资源与环境治理教育部国际合作联合实验室, 银川 750021
- 夏红军
- 周口师范学院, 河南省稀土功能材料重点实验室, 周口 466001
- 摘要：以苹果枝和葡萄枝为原料，制备了苹果枝生物质炭和葡萄枝生物质炭，并采用化学改性方法处理两种生物质炭，分别得到表面键合了四乙烯五胺的改性苹果枝生物质炭和改性葡萄枝生物质炭.采用红外光谱、扫描电镜等对两种生物质炭及其化学改性产品分别进行了表征，比较了两种生物质炭及其改性产品对水中Zn2+的吸附性能，并分析了吸附动力学和等温吸附特性.结果表明，改性生物质炭增加了表面吸附位点，最大吸附量明显增加，相同吸附量所用吸附时间大大缩短，吸附效果显著提高.4种吸附剂的吸附行为均符合准二级动力学模型及Langmuir方程.生物质炭吸附重金属的机理初步判定是以离子交换和阳离子-π键的作用为主，改性生物质炭对Zn2+吸附量和吸附速度的显著提升主要与键合基团的螯合作用有关.
- Abstract：Apple branch and vine branch were used respectively to prepare biochars, which were further modified by bonding tetraethylenepentamine. The biochars and their modified products were characterized by using FTIR and SEM. Adsorption behaviors of Zn2+ with the biochars and their modified products were investigated. their adsorption kinetics and characteristics were also analyzed. The results show that surface adsorption site of the two modified biochars were improved, meanwhile the maximum adsorption capacity and adsorption rate increased significantly. Adsorption behavior of the four adsorbents is consistent with the pseudo second-order model and the Langmuir equation. Mechanism of Zn2+ adsorption by the chemically modified biochars is mainly attributed to the chelation of tetraethylenepentamine.
