以玉米秸秆为原料,高锰酸钾为活化剂,制备成改性生物质炭材料,通过扫描电镜(SEM)、X射线光电子能谱(XPS)、比表面积测定(BET)、红外光谱(FT-IR)等手段表征材料结构特性,以氨氮废水为目标污染物进行吸附性能的研究。结果表明:预处理生物质炭与高锰酸钾质量比为1:2时制备的生物质炭(MBC-2)具有较高的氨氮吸附量。MBC-2形貌呈现片层状,含氧官能团增加,产生Mn—O键,比表面积达512m2/g,平均孔径2.767nm。该材料对氨氮吸附量达58mg/g,去除率87%,经8次再生循环后吸附量仍保持48.9mg/g,具有良好的再生性能。吸附机理符合Langmuir单层吸附模型与准一级动力学模型,说明吸附过程以物理吸附为主,包括静电引力与离子交换,以化学吸附为辅。该生物质炭对氨氮吸附性能良好,为氨氮废水的治理提供了一定的理论和技术支持。
Using corn stalks as raw material and potassium permanganate as an activator,modified biomass carbon materials were prepared.The structural characteristics of the materials were characterized by SEM,XPS,BET,and FT-IR.The adsorption performance of the materials was studied using ammonia nitrogen wastewater as the target pollutant.The results showed that the biomass carbon (MBC-2) prepared with a mass ratio of pretreated biomass carbon to potassium permanganate of 1:2 had a higher ammonia nitrogen adsorption capacity.MBC-2 exhibited a lamellar morphology,increased oxygen-containing functional groups,and the formation of Mn—O bonds,with a specific surface area of 512m2/g and an average pore diameter of 2.767nm.The adsorption capacity of this material for ammonia nitrogen was 58mg/g,with a removal rate of 87%.After eight regeneration cycles,the adsorption capacity remained at 48.9 mg/g,indicating good regeneration performance.The adsorption mechanism conformed to the Langmuir monolayer adsorption model and the pseudo-first-order kinetic model,indicating that the adsorption process was mainly physical adsorption,including electrostatic attraction and ion exchange,with chemical adsorption as a supplement.This biomass carbon exhibited good adsorption performance for ammonia nitrogen,providing certain theoretical and technical support for the treatment of ammonia nitrogen wastewater.
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基金资助
宁夏回族自治区重点研发计划(2020BEG03013);宁夏回族自治区自然科学基金项目(2025AAC030547)
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