使用负载 ZnAl-LDO 的改性香蕉秸秆生物炭从废水中吸附磷酸盐。
Phosphate adsorption from wastewater using ZnAl-LDO-loaded modified banana straw biochar.
机构信息
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin, 541004, China.
School of Environment and Resources, Guangxi Normal University, Guilin, 541004, China.
出版信息
Environ Sci Pollut Res Int. 2019 Jun;26(18):18343-18353. doi: 10.1007/s11356-019-05183-1. Epub 2019 May 1.
ZnAl-layered double hydroxide-loaded banana straw biochar (ZnAl-LDH-BSB) was prepared via the hydrothermal method, and the efficient phosphorus removal agent ZnAl-LDO-BSB was obtained by calcination at 500 °C. Based on the ZnAl-LDO-BSB adsorption characteristics, the adsorption mechanism was evaluated via TG/DTA, FTIR, XRD, SEM, HRTEM, and other characterization methods. The results showed that the ZnAl-LDO-BSB assembled into microspheres with typical hexagonal lamellar structures and presented good thermal stability. The adsorption of total phosphate (TP) by ZnAl-LDO-BSB conforms to the Langmuir model, and the theoretical maximum adsorption capacity is 185.19 mg g. The adsorption kinetics were in accordance with the second-order kinetic model, and the anion influence on TP adsorption followed the order CO > SO > NO. The combination of zeta potential measurements with the FTIR, XRD, SEM, HRTEM, and XPS results suggested that ZnAl-LDO-BSB adsorbs TP mainly by electrostatic adsorption, surface coordination, and anion intercalation. Graphical abstract.
ZnAl 层状双氢氧化物负载香蕉秸秆生物炭（ZnAl-LDH-BSB）通过水热法制备，通过在 500°C 下煅烧得到高效的磷去除剂 ZnAl-LDO-BSB。基于 ZnAl-LDO-BSB 的吸附特性，通过 TG/DTA、FTIR、XRD、SEM、HRTEM 等表征方法评估了吸附机理。结果表明，ZnAl-LDO-BSB 组装成具有典型六方层状结构的微球，具有良好的热稳定性。ZnAl-LDO-BSB 对总磷（TP）的吸附符合 Langmuir 模型，理论最大吸附容量为 185.19mg/g。吸附动力学符合二级动力学模型，阴离子对 TP 吸附的影响顺序为 CO > SO > NO。结合动电电位测量与 FTIR、XRD、SEM、HRTEM 和 XPS 结果表明，ZnAl-LDO-BSB 主要通过静电吸附、表面配位和阴离子插层吸附 TP。
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