研究报告

  • 江湛如,汤媛媛,李冰玉,龙九妹,杜辉辉,雷鸣.磁性海藻酸铁介孔碳微球的合成及对水体中砷的去除[J].环境科学学报,2018,38(6):2382-2392

  • 磁性海藻酸铁介孔碳微球的合成及对水体中砷的去除
  • Synthesis of magnetic alginate mesoporous carbon for the removal of As from water solution
  • 基金项目:国家自然科学基金(No.41671475)
  • 作者
  • 单位
  • 江湛如
  • 1. 湖南农业大学资源环境学院, 长沙 410128;2. 农业农村部南方产地污染防控重点实验室, 长沙 410128
  • 汤媛媛
  • 湖南农业大学资源环境学院, 长沙 410128
  • 李冰玉
  • 1. 湖南农业大学资源环境学院, 长沙 410128;2. 农业农村部南方产地污染防控重点实验室, 长沙 410128
  • 龙九妹
  • 1. 湖南农业大学资源环境学院, 长沙 410128;2. 农业农村部南方产地污染防控重点实验室, 长沙 410128
  • 杜辉辉
  • 1. 湖南农业大学资源环境学院, 长沙 410128;2. 农业农村部南方产地污染防控重点实验室, 长沙 410128
  • 雷鸣
  • 1. 湖南农业大学资源环境学院, 长沙 410128;2. 农业农村部南方产地污染防控重点实验室, 长沙 410128
  • 摘要:本研究以海藻酸钠作为基体前驱材料,利用离子交联法合成了海藻酸铁微球,然后进一步运用真空冷冻和高温裂解法制备了表面附着纳米铁氧化物的磁性海藻酸铁介孔碳微球(MAMC).同时,采用热场发射扫描电镜显微镜、X射线光电子能谱、热重分析仪、磁学测量系统、BET比表面孔径分析仪等对MAMC进行表征,并研究了MAMC对As(Ⅲ)和As(V)的吸附性能,重点考察投加量、pH、时间、初始污染物浓度对吸附性能的影响,并对吸附过程进行了动力学拟合和等温吸附方程拟合,最后对材料进行了再生实验.结果表明,MAMC对As(Ⅲ)和As(V)均表现出良好的吸附性能,对As(Ⅲ)的吸附能力优于As(V);当pH值为5~7时,MAMC对两种价态As的吸附效率最优;材料的吸附量随着时间的增加而增加.动力学拟合结果表明,MAMC的吸附过程较好地满足准二级动力学方程,等温吸附曲线较好地满足于Langmuir方程.此外,使用0.1 mol· L-1的NaOH对材料的再生和脱附效果较好,能够实现材料的二次利用.本研究结果对处理含砷废水提供了重要的理论依据.
  • Abstract:In this paper, magnetic mesoporous carbon microspheres (MAMC) were obtained by vacuum freezing and pyrolysis of sodium alginate microspheres which were pre-syntheszed by ion-crosslinking method using inexpensive sodium alginate as matrix precursor. The materials were characterized by SEM, X-ray photoelectron spectroscopy, Thermogravimetric analysis, BET and magnetic measurements. We investigated the sorption properties of MAMC towards As(Ⅲ) and As(V) as a function of dosage, pH, contact time and initial metal concentration. The sorption process was characterized by kinetic and isothermal equation fitting. The desorption and regeneration of MAMC were also studied.The results showed that MAMC exhibited good adsorption performance on As(Ⅲ) and As(V), with a larger sorption capacity for As(Ⅲ) than As(V). MAMC has the best effect on As adsorption at pH~5~7. The absorption capacity of MAMC increased with the time. The kinetic results indicated that the sorption process is best described by pseudo-second-order kinetics model, while the isotherm adsorption curves are best fitted by Langmuir equation. Moreover, The regeneration results showed that the MAMC could be regenerated and reused by 0.1 mol· L-1 NaOH solution. This study provide an important theoretical basis for the treatment of arsenic-containing wastewater.

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