| 复合金属改性生物炭对水体中低浓度磷的吸附性能 |
| 摘要点击 2705 全文点击 1125 投稿时间：2019-04-07 修订日期：2019-10-02 |
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| 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 biochar low concentration phosphorus adsorption composite metal modified ferric chloride potassium permanganate |
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| 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，ΔGθ < 0、ΔHθ > 0和ΔSθ > 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 ΔGθ < 0, ΔHθ > 0, and ΔSθ > 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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