分析改性生物炭复合材料对重金属Ni(Ⅱ)的吸附性能及机理研究,以原始收集的农林废弃物核桃壳为原料,将其在氮气氛围下炭化,制备氮炭化核桃壳生物炭,再使用天然蒙脱土为改性剂制备改性生物炭复合材料,并对其加以表征分析。进行扫描电镜(SEM)、傅里叶红外光谱仪(FT-IR)和X射线光电子能谱仪(XRD)等分析,探究改性核桃壳炭基材料的微观结构和性能。结果表明:改性生物炭表面粗糙,疏松多孔,蒙脱土颗粒附着在生物炭表面,孔隙结构发达,与未改性前的生物炭相比活性位点增加,提升吸附效果。吸附剂用量1.2g/L,pH为6,反应温度为室温298K,时间6h转速为160r/min进行震荡,去除Ni(Ⅱ)效率最高为94.0%。吸附过程符合拟二级动力学模型和Langmuir模型,吸附过程以化学吸附为主。因此,改性后的生物炭复合材料对水体中重金属Ni(Ⅱ)的去除具有较好的效果,对今后重金属水体污染治理和修复具有一定的应用前景。
To study the adsorption performance and mechanism of modified biocarbon composites for heavy metal Ni(Ⅱ),the collected agricultural and forestry waste walnut shells were used as raw materials,which were carbonized under nitrogen atmosphere to prepare nitrogen-carbonized walnut shells biochar,and then natural montmorillonite was used as a modifier to prepare modified biochar composites.These composites were characterized and analyzed.SEM,FT-IR and XRD analyses were carried out to investigate the microstructure and properties of the modified walnut shell charcoal-based materials.The results showed that the surface of modified biochar was rough,loose and porous,and the montmorillonite particles were successfully attached to the surface of the biochar with a well-developed pore structure,which increased the active sites and enhanced the adsorption effect compared with that of the biochar before modification.The adsorbent dosage of 1.2g/L,pH 6,reaction temperature of 298K at room temperature,and time of 6h with a rotational speed of 160r/min were used for shaking,and the highest efficiency of Ni(Ⅱ) removal was 94.0%.The adsorption process conformed to the pseudo-secondary-order kinetic model and the Langmuir model,and the process of adsorption was dominated by chemical adsorption.The results of the experiments indicated that the modified biochar composites had a good effect on the removal of heavy metal Ni(Ⅱ) in water,and had a certain application prospect for future heavy metal water pollution treatment and environmental remediation.
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基金资助
国家自然科学基金(51868018)
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