数字农科院2.0

Composites hybridized with Ca(OH)2 and LaMnO3 synergistically improve phosphate adsorption properties

文献类型： 外文期刊

作者： Feng, Menghan;Li, Mengmeng;Guo, Changbin;Zhang, Xueyan;Yuan, Tian;Zhang, Keqiang;Wang, Feng

作者机构：

期刊名称： NEW JOURNAL OF CHEMISTRY

ISSN： 1144-0546

年卷期： 2024 年

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收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Phosphate loading is an important factor in the deterioration of freshwater ecosystems. La-based perovskites, a new type of adsorbent material, suffer from low phosphate adsorption performance and are highly affected by pH. Hence, the construction of materials with high phosphate adsorption performance over a wide pH range for phosphate removal is a challenge. In this study, Ca(OH)(2)-hybridized LaMnO3 perovskite composites (Ca-x-LMO, x = 0, 0.2, 0.4, 0,7) were prepared by impregnating different ratios of CaO on LaMnO3. Isothermal, kinetic, and influential factor tests showed that the maximum phosphate adsorption capacity of Ca-0.4-LMO for phosphate reached 101.1 mg P g(-1), which was 1.14 times higher than that of the original Ca-0-LMO. The phosphate adsorption capacity of Ca-0.4-LMO was minimally affected by pH and only decreased by 17.8% with increasing pH. Therefore, the synergistic effect of Ca(OH)(2) and LaMnO3 improved the performance of the material for phosphate adsorption over a wide pH range. In the experiments using three types of real wastewater, the removal rate of Ca-0.4-LMO reached 99.6% for high-concentration cattle farm wastewater. Quantitative removal was realized for low-concentration pond wastewater and the effluent of sanitary wastewater, revealing high efficiency in removing phosphate from real water bodies. After eight adsorption-desorption cycles, the phosphate removal rate of Ca-0.4-LMO remained up to 96%, proving its reusability. Characterization results showed that the phosphate adsorption process was mainly chemisorption, and the adsorption mechanisms were ligand exchange, inner-layer complexation, and electrostatic attraction. This study provides a new approach for improving the phosphate adsorption performance of La-based perovskites for phosphate removal over a wide pH range.

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