中文关键词生物炭低浓度磷吸附复合金属改性氯化铁高锰酸钾 英文关键词biocharlow concentration phosphorusadsorptioncomposite metal modifiedferric chloridepotassium permanganate

作者	单位	E-mail
孙婷婷	长江水利委员会长江科学院流域水环境研究所, 武汉 430010	tingtingsunhx@126.com
高菲	长江水利委员会长江科学院流域水环境研究所, 武汉 430010
林莉	长江水利委员会长江科学院流域水环境研究所, 武汉 430010	artemis066@163.com
黎睿	长江水利委员会长江科学院流域水环境研究所, 武汉 430010
董磊	长江水利委员会长江科学院流域水环境研究所, 武汉 430010

中文摘要 通过FeCl₃和KMnO₄溶液对果壳生物炭进行浸渍改性，探索复合改性生物炭（Fe：Mn=1：1）对低浓度磷的吸附性能.结果表明，铁锰复合改性生物炭对低浓度磷的吸附效果远远大于铁改性及锰改性；SEM和FT-IR测定表明，铁锰复合改性后生物炭表面可能存在铁锰氧化物和铁氢氧化物.在磷浓度为0.5 mg·L^-1、温度为298 K、固液比（mg：L）为500时，吸附量为0.96 mg·g^-1.当溶液的pH为4~10，均具有较高的去除率和吸附量.等温吸附实验数据符合Freundlich方程，为多层吸附.吸附热力学研究表明，ΔG^θ < 0、ΔH^θ > 0和ΔS^θ > 0，说明该吸附是自发、熵增加的吸热过程.吸附动力学分析发现，改性后生物炭在60 min内基本达到吸附平衡，吸附过程符合准二级动力学方程，以化学吸附为主.可为天然水体和污水处理厂低浓度除磷提供理论数据支撑. 英文摘要 In this study, we synthesized composite metal modified biochar using fruit shell biochar impregnated with ferric chloride and potassium permanganate. We investigated its potential to adsorb phosphorus at low concentrations. Results show that the adsorption of low-concentration phosphorus by Fe and Mn modified biochar was significantly better than by non-modified biochar. SEM and FT-IR spectra indicate that iron and manganese oxides or iron hydroxides might be present on the surface of Fe and Mn modified biochar. When the phosphorus concentration is 0.5 mg·L^-1 at a temperature is 298 K and solid-to-liquid ratio (mg:L) of 500, the adsorption capacity of modified biochar is 0.96 mg·g^-1. When the pH of the solution is 4 to 10, a higher removal rate and adsorption capacity are realized. The biochar equilibrium data were fitted to the Freundlich equation, which indicated that the adsorption was a multimolecular layer adsorption. Adsorption thermodynamics studies showed that ΔG^θ < 0, ΔH^θ > 0, and ΔS^θ > 0, indicating that the adsorption was a spontaneous, with positive entropy, and an endothermic process. The adsorption reached equilibrium after 60 min, and the adsorption kinetics followed a pseudo-second-order model. This research provides basic data for the removal of low-concentration phosphorus from a water body and sewage treatment plant.

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