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| Modified zeolite biochar for the adsorption performance and mechanism of heavy metal Pb（Ⅱ） |
| Received:September 25, 2024 |
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| KeyWord:zeolite;biochar;Pb（Ⅱ）;adsorption;one-step co-pyrolysis |
| Author Name | Affiliation | E-mail | | LI Junjie | Beijing Institute of Technology, Zhuhai, Zhuhai 519088, China | | | WANG Yuying | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | HUANG Jiaqi | Beijing Institute of Technology, Zhuhai, Zhuhai 519088, China | | | CHENG Kai | College of Resource and Environment, Anhui Science and Technology University, Chuzhou 311300, China | | | Lü Haohao | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | HE Lili | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | YU Juan | Beijing Institute of Technology, Zhuhai, Zhuhai 519088, China | 15296@bitzh.edu.cn |
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| Abstract: |
| To investigated the remediation performance and mechanisms of zeolite-modified biochar composites for Pb（Ⅱ）-contaminated water treatment. Zeolite-biochar composites with different mass ratios were synthesized via one-step co-pyrolysis using rice husk as the biomass precursor. Comprehensive characterization was conducted employing brunauer-emmett-teller（BET）analysis, scanning electron microscopy with energy dispersive spectroscopy（SEM-EDS）, X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, and Fourier-transform infrared spectroscopy（FTIR）. The adsorption behavior was evaluated under varying environmental conditions including solution pH（2.0-6.0）, contact time（0-24 h）, initial Pb（Ⅱ）concentrations（10-80 mg·L-1）, and ionic strength（0-0.5 mol·L-1 NaCl）. Experimental results demonstrated successful composite formation with optimal Pb（Ⅱ）removal efficiency observed at pH 6.0. The optimal parameters were identified as 12-24 h contact time and 25-65 mg·L-1 initial Pb（Ⅱ）concentration. Adsorption kinetics for BC, ZR1∶1, ZR1∶2, and ZR2∶1 composites followed pseudo-second-order models, while the Freundlich isotherm model best described the multilayer adsorption process. Notably, NaCl concentration exhibited a biphasic effect on Pb（ Ⅱ ） removal efficiency, showing comparable performance at 0 and 0.001 mol·L-1, followed by a characteristic decrease-increase pattern with increasing ionic strength. The 1∶2 zeolitebiochar composite demonstrated superior adsorption capacity compared to unmodified biochar. This research provides an optimized strategy for Pb（Ⅱ）contamination remediation. |
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