构筑锆基活性位点用于电吸附磷酸盐的研究

Construction of zirconium-based active site for phosphate electro-adsorption

水体中含有过量的磷会导致富营养化等环境污染问题,有效去除磷酸盐的方法引发了研究者们的关注。通过液相浸渍耦合焙烧法成功制备了Zr基金属掺杂的活性炭电极材料(ZrAC),并将其用于电吸附除磷。通过XRD、XPS、SEM、EDS及TEM表征了该复合活性炭材料,结果表明,所合成的ZrAC材料具有良好的晶体结构特征,Zr的负载为磷酸盐去除提供了充足的吸附位点。所制备的电极材料对磷酸盐的去除符合伪二级动力学模型,在1.0 V的电压下,电极对PO_(4)^(3-)的吸附量可达到29.43 mg/g,外接电压显著提升了对磷酸盐的去除性能,ZrO_(2)对PO_(4)^(3-)的捕获主要源于Zr—O—P键的形成,由此提升了电极材料对PO_(4)^(3-)的吸附能力和速度。此外,所合成的ZrAC电极材料在电吸附过程中具有较好的抗干扰能力和稳定性。

Excessive phosphorus in water can lead to environmental pollution problems such as eutrophication,and effective methods for removing phosphate have attracted the attention of researchers.The electrode material(ZrAC)of Zr-based metal doped activated carbon was successfully prepared by liquid-phase impregnation coupled calcination method and used for phosphorus electro-adsorption.The composite activated carbon material was characterized by XRD,XPS,SEM,EDS and TEM.The results indicated that the synthesized ZrAC material exhibited favorable crystal structure characteristics,while the incorporation of Zr provided an ample number of adsorption sites for efficient phosphate removal.The kinetics of the prepared electrode material during the phosphate removal process followed a pseudo-second-order kinetic model.At a voltage of 1.0 V,the PO_(4)^(3-)electro-adsorption capacity could reach 29.43 mg/g,and the external voltage significantly improved the phosphate removal effect.The capture of PO_(4)^(3-)by ZrAC was primarily attributed to the formation of Zr—O—P bond,thereby enhancing the adsorption capacity and rate of the electrode material towards PO_(4)^(3-).Moreover,the synthesized ZrAC electrode material exhibited excellent resistance to interference and stability during electro-adsorption.