碱熔联合水热改性生物质电厂灰高效吸附多种重金属离子

万敬敏; 张发旺; 韩占涛; 宋佩佩; 白云

doi:10.13205/j.hjgc.202209015

碱熔联合水热改性生物质电厂灰高效吸附多种重金属离子

doi: 10.13205/j.hjgc.202209015

1. 中国地质科学院岩溶地质研究所, 广西桂林 541004;
2. 河北地质大学水资源与环境学院水资源可持续开发利用重点实验室, 石家庄 050031;
3. 中国地质调查局水文地质和环境地质调查中心, 河北保定 071051;
4. 生态环境部土壤、农业和农村生态环境技术中心, 北京 100012

基金项目:

国家重点研究开发计划(2019YFC1805300)

河北省高校基本科研业务费(QN202119)

详细信息

作者简介:
万敬敏(1980-),女,讲师,主要研究方向为环境污染治理与修复。Wan-jm1980@163.com

通讯作者:
韩占涛(1977-),男,研究员,主要研究方向为土壤与地下水修复。hanzhantao@tcare-mee.cn

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出版历程
- 收稿日期: 2021-09-23
- 网络出版日期: 2022-11-09

ADSORPTION OF HEAVY METAL IONS ON ALKALI-MELTIING AND HYDROTHERMAL MODIFIED BIOFUEL ASH

1. Institute of Karst Geology, CAGS, Guilin 541004, China;
2. Key Laboratory of Sustained Development and Utilization of Water Resources, School of Water Resources and Environment, Hebei GEO University, Shijiazhuang 050031, China;
3. Center for Hydrogeology and Environmental Geology Survey, CGS, Baoding 071051, China;
4. Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China

摘要

摘要: 以生物质电厂灰(biofuel ash, BFA)为原料,采用碱熔联合水热技术对BFA进行改性,制备地质聚合物-沸石复合材料,利用SEM、XRD、FTIR等技术对改性前后的BFA进行表征,并研究了改性BFA(MBFA)对Cd²⁺、Zn²⁺、Cu²⁺和Pb²⁺离子的吸附性能。结果表明:MBFA的比表面积、孔体积显著提高;拟一级和拟二级动力学模型均能较好地描述MBFA对Cd²⁺、Zn²⁺、Cu²⁺和Pb²⁺的吸附过程(R²>0.9375),说明同时存在物理、化学吸附;温度为298 K时,Langmuir方程和Freundlich方程对Cd²⁺、Zn²⁺、Cu²⁺吸附等温线均达到较好的拟合度(0.9223<R²<0.9982),而MBFA对Pb²⁺的吸附过程更符合Langmuir方程,根据Langmuir模型的拟合结果,MBFA对单一溶液中Cd²⁺、Zn²⁺、Cu²⁺和Pb²⁺的吸附量分别为71.26,53.52,54.05,279.48 mg/g,高于大多数硅铝酸盐吸附剂;MBFA对重金属离子的吸附受到共存金属离子的干扰,竞争吸附的顺序为Pb²⁺>Cu²⁺>Cd²⁺>Zn²⁺。
- 生物质电厂灰 /
- 改性 /
- 沸石 /
- 地质聚合物 /
- 吸附 /
- 重金属离子
Abstract: Biofuel ash(BFA) was modified by alkali melting combined with hydrothermal method, and generated geopolymer-zeolite composition. XRD, SEM, and FTIR were carried out to characterize biofuel ash before and after modification, and the adsorption characteristics of modified BFA(MBFA) for Cd²⁺, Zn²⁺, Cu²⁺, Pb²⁺ were studied. The result indicated that the specific surface area and pore volume of modified biofuel ash were enhanced obviously. Both the pseudo-first-order kinetics and the pseudo-second-order kinetic models could well describe the adsorption process of MBFA for Cd²⁺, Zn²⁺, Cu²⁺, and Pb²⁺(R²>0.9375), indicating the existence of both physical and chemical adsorption. At 298 K, both the Langmuir equation and Freundlich equation reached a high fitting degree(0.9223≤R²≤0.9982) for Cd²⁺, Zn²⁺, Cu²⁺, but for Pb²⁺, Langmuir equation were better. According to the fitting results of the Langmuir model, the adsorption capacity of modified biofuel ash of Cd²⁺, Zn²⁺, Cu²⁺ and Pb²⁺ in single heavy metal ion solution was 71.26, 53.52, 54.05, 279.48 mg/g, respectively, which were higher than most similar adsorbents. The adsorption of the heavy metal ions onto MBFA was disturbed by coexisting metal ions, and in mixed solution the selective adsorption of heavy metal ions by MBFA was in the order of Pb²⁺>Cu²⁺>Cd²⁺>Zn²⁺.
- biofuel ash /
- modification /
- zeolite /
- geopolymers /
- adsorption /
- heavy metal ions

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