| 李俊杰,汪玉瑛,黄嘉琪,程凯,吕豪豪,何莉莉,俞娟.沸石改性生物炭对重金属Pb(Ⅱ)的吸附性能及其机理[J].农业环境科学学报,2025,44(12):3230-3240. |
| 沸石改性生物炭对重金属Pb(Ⅱ)的吸附性能及其机理 |
| Modified zeolite biochar for the adsorption performance and mechanism of heavy metal Pb(Ⅱ) |
| 投稿时间:2024-09-25 |
| DOI:10.11654/jaes.2024-0802 |
| 中文关键词: 沸石 生物炭 Pb(Ⅱ) 吸附性能 一步共热解法 |
| 英文关键词: zeolite biochar Pb(Ⅱ) adsorption one-step co-pyrolysis |
| 基金项目:国家自然科学基金项目(42307300) |
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| 摘要点击次数: 1074 |
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| 中文摘要: |
| 为探究沸石改性生物炭对重金属Pb(Ⅱ)污染水体处理的效果及其机制,采用一步共热解法制备了不同沸石添加比例的沸石改性生物炭,并选取稻壳作为生物炭前驱体,利用比表面积(BET)、扫描电镜及能谱(SEM-EDS)、X射线衍射(XRD)、X射线光电子能谱(XPS)和傅里叶变换红外光谱(FTIR)对沸石改性生物炭复合材料进行表征,并探究了在不同pH值(pH 2.0~6.0)、反应时间(0~24 h)、初始Pb(Ⅱ)浓度(10~80 mg·L-1)及离子强度(0~0.5 mol·L-1 NaCl)条件下,改性生物炭对Pb(Ⅱ)的吸附行为。结果显示,沸石颗粒与生物炭复合成功,稻壳炭与沸石-生物炭复合材料在溶液pH值为6.0时对Pb(Ⅱ)的去除率最高,最优反应时间为12~24 h,最优Pb(Ⅱ)溶液初始浓度为25~65 mg·L-1。未改性生物炭(BC)、ZR1∶1、ZR1∶2和ZR2∶1对Pb(Ⅱ)的吸附过程更符合准二级动力学模型,Freundlich模型能更好地拟合ZR1∶1、ZR1∶2和ZR2∶1对Pb(Ⅱ)的吸附等温过程。电解质NaCl浓度为0和0.001 mol·L-1时,BC和ZR1∶2对Pb(Ⅱ)的去除效果最佳且无显著差异,但随着NaCl浓度增大,吸附剂对Pb(Ⅱ)的去除率呈先降后升的趋势。研究表明,沸石改性生物炭是高效的重金属Pb(Ⅱ)吸附材料,其最优质量比为1∶2,吸附性能优于未改性稻壳炭。通过优化制备条件和吸附参数,可实现Pb(Ⅱ)污染水体的有效治理。 |
| 英文摘要: |
| 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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