塔里木大学学报2025，Vol.37Issue(6)：64-76,13.DOI:10.3969/j.issn.1009-0568.2025.06.007
ZnAl-LDH/CeO2复合材料对磷酸盐吸附的研究
Study on the adsorption of phosphate by ZnAl-LDH/CeO2 composites
摘要
Abstract
To mitigate the environmental pollution and harm caused by phosphorus discharge,it is imperative to conduct advanced treatment on low-concentration phosphorus-containing secondary sewage.In this study,a new type of environmentally friendly nanocomposite ZnAl-LDH/CeO2 were fabricated by a hydrothermal method and was employed as a high-efficiency adsorbent for the removal of low-concentration phosphate from simulated secondary wastewater.Its structure and micromorphology were characterized by scanning electron microscopy(SEM),Fourier transform spectroscopy(FTIR),Zata potential analysis,X-ray diffraction(XRD)Brunauer-Emmett-Teller(BET),and X-ray photoelectron spectroscopy(XPS).The influences of adsorption parameters such as adsorbent dosage,pH of solution,phosphate concentration,adsorption time and experimental temperature on adsorption performance were investigated by batch adsorption experiments,along with the adsorbent's reusability.Furthermore,the adsorption behavior was analyzed from both kinetic and thermodynamic perspectives.The experimental results displayed that the removal rate of phosphate by ZnAl-LDH/CeO2 reached 92.86％,and the phosphate adsorption efficiency of ZnAl-LDH/CeO2 remained above 80％after 5 times of adsorption-desorption,indicating favorable reusability.The kinetic data showed that the ZnAl-LDH/CeO2 adsorption kinetics model was consistent with the pseudo-second-order kinetic model(R2=0.992 7).At an initial concentration was 100 mg/L,the qe value was 15 546.02 μg/g.The thermodynamics of the adsorption process conformed to the Freundlich model(R2=0.995 6),with the 1/n value being 0.382 6,which falls within the range of 0.1-0.5.The KF value was 4 928.49 mg/g·(L/mg)1/n.The recovery of ZnAl-LDH/CeO2 after adsorbing phosphate can be used as fertilizer,which can promote plant growth,thus achieving the efficient utilization of adsorbents,and recycling of phosphorus in ecosystems.关键词
ZnAl-LDH/CeO2/吸附/低浓度磷酸盐/肥料Key words
ZnAl-LDH/CeO2/adsorption/low concentration phosphate recovery/fertilizer分类
化学化工引用本文复制引用
TANG Fengqin,XIONG Runwen,SUN Yuan,ZOU Shiqi,CHEN Peng,WU Ying..ZnAl-LDH/CeO2复合材料对磷酸盐吸附的研究[J].塔里木大学学报,2025,37(6):64-76,13.基金项目
塔里木大学大学生创新创业训练计划项目(202510757021) （202510757021）
塔里木大学校长基金硕士人才项目(TDZKSS202250) （TDZKSS202250）
