中文关键词沼渣磷生物炭等温吸附吸附动力学 英文关键词biogas residuephosphorusbiocharadsorption isothermsadsorption kinetics

作者	单位	E-mail
易蔓	农村清洁工程重庆市工程研究中心, 重庆 400716 西南大学资源环境学院, 重庆 400715	104471801@qq.com
李婷婷	农村清洁工程重庆市工程研究中心, 重庆 400716
李海红	农村清洁工程重庆市工程研究中心, 重庆 400716
黄巧	农村清洁工程重庆市工程研究中心, 重庆 400716
杨金娥	农村清洁工程重庆市工程研究中心, 重庆 400716
陈玉成	农村清洁工程重庆市工程研究中心, 重庆 400716 西南大学资源环境学院, 重庆 400715	chenyucheng@swu.edu.cn
杨志敏	农村清洁工程重庆市工程研究中心, 重庆 400716 西南大学资源环境学院, 重庆 400715

中文摘要 为处理含磷废水和实现沼渣资源化利用，将农业废弃物沼渣制备成生物炭（ZZs），通过CaCl₂和MgCl₂溶液对其进行浸渍改性，探究改性沼渣生物炭（CMZZs）对水体中磷的吸附特征.结果表明，改性后沼渣生物炭钙镁含量分别是改性前的1.3和15.4倍；SEM-EDS、BET、FTIR和XRD等测定表明，改性未改变生物炭表面化学官能团种类，但改性后生物炭出现新的衍射峰，与标准卡片对比后认为可能存在Mg（OH）₂、MgO等物质.当温度为303 K，溶液pH为9.0时，CMZZs最大吸附量为76.92 mg·g^-1，是改性前的30.1倍.等温吸附实验数据符合Freundlich方程，为多层吸附.吸附动力学分析发现，改性后生物炭在100 min内基本达到吸附平衡，吸附过程符合假二级动力学方程，以化学吸附为主.上述结果说明钙镁改性沼渣生物炭对于去除水中磷具有潜在价值. 英文摘要 In this study, we synthesized Ca/Mg biochar sorbents (CMZZs) by pyrolysis of biogas residue (ZZs) impregnated with calcium chloride and magnesium chloride and investigated their potential to adsorb P from water. The results showed that the content of calcium and magnesium in the modified biochar was 1.3 and 15.4 times, respectively, what they were before the modification. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) patterns showed that the type of chemical functional groups on the surface of biochar had not changed, but several new peaks appeared, indicating that Mg (OH)₂ and MgO might be present on the surface of the CMZZs. The biochar equilibrium data were well described by the Freundlich model, and the adsorption reached equilibrium after 100 min. The adsorption kinetics followed a pseudo-second-order model, and the maximum adsorption capacity of the CMZZs was 76.92 mg·g^-1 when the pH was 9 and the temperature 303 K. The results revealed that a soaking method can effectively load Ca²⁺ and Mg²⁺ onto the surface of ZZ, and CMZZs offer a promising adsorbent for P removal with a high adsorption capacity for P from wastewater.

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