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为了减少磷排放对环境造成的污染和危害，亟需对低浓度含磷二级污水进行深度处理。本研究采用水热法成功制备了一种新型环保的锌(Zn)铝(Al)修饰水滑石(LDH)与二氧化铈(CeO2)复合纳米材料ZnAl-LDH/CeO2,并将其作为高效吸附剂用于模拟二级废水中低浓度磷酸盐的去除。采用扫描电子显微镜(SEM)、傅里变换叶红外光谱仪(FTIR)、Zeta电位、X射线衍射仪(XRD)、Brunauer-Emment-Teller氮气吸附法(BET)、X射线电子能谱仪(XPS)等技术对其结构和微观形貌进行表征。通过分批吸附实验，系统探究了吸附剂用量、溶液pH、磷酸盐浓度、吸附时间及温度等参数对吸附性能与吸附剂可重复使用性的影响，并对其吸附行为进行了动力学和热力学探讨。试验结果表明，ZnAl-LDH/CeO2对磷酸盐的去除率达到92.86%,经过5次吸附-解吸后，ZnAl-LDH/CeO2对磷酸盐的吸附效率仍可达到80%以上，具有较好的可重复使用性能。动力学数据表明，ZnAl-LDH/CeO2吸附动力学模型可以与拟二级动力学模型相吻合(R2=0.992 7),当初始浓度为100 mg/L时，qe,cal值为15 546.02μg/g。吸附过程热力学符合Freundlich模型(R2=0.995 6),且1/n的值为0.382 6,在0.1～0.5之间，KF值为4 928.49 mg/g·(L/mg)1/n。吸附完磷酸盐的ZnAl-LDH/CeO2回收可以作为肥料，能够促进植物生长，实现了吸附剂的高效利用和生态系统中磷的循环利用。
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.
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基本信息:
中图分类号:X703;TB33;TQ424
引用信息:
[1]唐风琴,熊润文,孙源,等.ZnAl-LDH/CeO_2复合材料对磷酸盐吸附的研究[J].塔里木大学学报,2025,37(06):64-76.
基金信息:
塔里木大学大学生创新创业训练计划项目(202510757021);塔里木大学校长基金硕士人才项目(TDZKSS202250)
2025-12-15
2025-12-15