| 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 |
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| 引用本文： | 万敬敏,张发旺,韩占涛,宋佩佩,白云.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[J].环境工程,2022,40(9):108-117. |
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| 作者姓名： | 万敬敏 张发旺 韩占涛 宋佩佩 白云 |
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| 作者单位： | 1. 中国地质科学院岩溶地质研究所, 广西 桂林 541004; |
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| 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) |
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| 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(0.9223Cu2+>Cd2+>Zn2+。
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| 关 键 词： | 生物质电厂灰 改性 沸石 地质聚合物 吸附 重金属离子 |
| 收稿时间： | 2021-09-23 |
ADSORPTION OF HEAVY METAL IONS ON ALKALI-MELTIING AND HYDROTHERMAL MODIFIED BIOFUEL ASH |
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| Affiliation: | 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 |
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| 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+. |
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