吸附法处理含金属离子废水是解决水体污染的重要方法之一,而生物炭是良好的吸附剂。采用热解法获得玉米芯基生物炭后以乙二胺四乙酸二钠(EDTA)进行改性处理,通过单因素法研究吸附处理含铜溶液的影响因素及规律,并借助X射线衍射(XRD)和扫描电子显微镜-能谱分析(SEM-EDS)等方法进行分析表征。结果表明:改性玉米基生物炭主要以无定形碳的形式存在,具有丰富的孔道体系,平均孔径为13.73μm;当铜离子溶液初始浓度为100mg/L,反应温度为45℃、改性后玉米芯基生物炭用量6g/L、吸附时间为60min时,改性玉米芯基生物炭对铜的吸附量为13.57mg/g;铜离子在改性玉米芯基生物炭上的吸附宜用准二级动力学模型进行解析,过程受物理吸附和化学吸附共同控制,是一个自发的吸热过程。
Adsorption is one of the key methods for treating metal-laden wastewater,in which biochar serves as an effective adsorbent.In this work,biochar derived from corn cobs was prepared through pyrolysis and subsequently modified with disodium ethylenediaminetetraacetic acid (EDTA).Its adsorption performance toward copper ions was evaluated using a single-factor approach.The material was characterized by X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS).The results indicated that modified biochar mainly existed in the form of amorphous carbon and possessed a well-developed porous structure with an average pore diameter of 13.73μm.When the initial concentration of Cu2+ was 100mg/L,the temperature was 45℃,the adsorbent dosage of modified corn cob-based biochar was 6g/L,and the adsorption time was 60min,the adsorption capacity of modified corn cob-based biochar for copper reached 13.57mg/g.The adsorption process followed the pseudo-second-order kinetic model,indicating that it was governed by both physical and chemical adsorption and occurred as a spontaneous endothermic reaction.
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基金资助
四川省科技计划资助(2025ZNSFSC0367);纤维材料复合技术达州市重点实验室开放项目(XWCL24ZA-01)
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