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

WAN Jing-min; ZHANG Fa-wang; HAN Zhan-tao; SONG Pei-pei; BAI Yun

doi:10.13205/j.hjgc.202209015

Volume 40 Issue 9

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(9): 108-117

WAN Jing-min, ZHANG Fa-wang, HAN Zhan-tao, SONG Pei-pei, BAI Yun. ADSORPTION OF HEAVY METAL IONS ON ALKALI-MELTIING AND HYDROTHERMAL MODIFIED BIOFUEL ASH[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 108-117. doi: 10.13205/j.hjgc.202209015

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WAN Jing-min, ZHANG Fa-wang, HAN Zhan-tao, SONG Pei-pei, BAI Yun. ADSORPTION OF HEAVY METAL IONS ON ALKALI-MELTIING AND HYDROTHERMAL MODIFIED BIOFUEL ASH[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 108-117. doi: 10.13205/j.hjgc.202209015

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

doi: 10.13205/j.hjgc.202209015

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

Received Date: 2021-09-23
Available Online: 2022-11-09

Abstract

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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References(46)

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