Lanthanum hydroxide showed best application potential in La-based materials based on its stable phosphate adsorption properties in complex water environments

IF 5.9 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-05-17 DOI:10.1016/j.jes.2024.05.014

Linjuan Zhu , Yao Zhang , Shuo Xu , Baoyou Shi , Haotian Hao , Yili Wang

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Abstract

Three lanthanum morphology materials encompassing all lanthanum composites were synthesized by the direct precipitation method, and their phosphate adsorption order was determined as La₂(CO₃)₃ > La(OH)₃ > La₂O₃. Further comparison of the adsorption performance between La₂(CO₃)₃ and La(OH)₃ revealed that the former exhibited a twofold higher rate of adsorption compared to the latter. The presence of SO₄²⁻, HCO₃⁻, Mg²⁺, and HA in the water led to a decrease in the phosphate adsorption of La₂(CO₃)₃ and La(OH)₃, while Ca²⁺ enhances the adsorption of phosphoric acid by both materials. Compared to La₂(CO₃)₃, La(OH)₃ exhibited stronger resistance against coexisting ions. The pH was the limiting factor for phosphate adsorption in both cases, and their adsorption capacity decreased significantly as the pH increased. The phosphate adsorption mechanism of La₂(CO₃)₃ was ligand exchange to form inner-sphere complexes, while the phosphate adsorption mechanism of La(OH)₃ involved ligand exchange, inner-sphere complexation, and electrostatic attraction. The stability of La(OH)₃ exhibited superior performance compared to that of La₂(CO₃)₃ over 5 adsorption-desorption cycles. Although La₂(CO₃)₃ had a higher initial phosphate adsorption capacity than La(OH)₃, its phosphate adsorption capacity decreased by 40% after five adsorption-desorption cycles, while that of La(OH)₃ decreased by 2.3%. Additionally, the amount of La(OH)₃ adsorbed after five cycles was 25.6% higher than that of La₂(CO₃)₃. Therefore, La(OH)₃ performs better regeneration adsorption than La₂(CO₃)₃. Furthermore, a smaller dosage of La(OH)₃ was required compared to La₂(CO₃)₃ in a test aimed at lowering the actual phosphate concentration in water to 0.5 mg/L. In summary, La(OH)₃ is a more suitable substrate for cyclic adsorption for phosphorus removal than La₂(CO₃)₃ and has better potential for practical application. In conclusion, La(OH)₃ proves to be a more suitable substrate for cyclic adsorption in phosphorus removal compared to La₂(CO₃)₃ and exhibits superior potential for practical application.

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氢氧化镧在复杂的水环境中具有稳定的磷酸盐吸附特性，显示出 La 基材料的最佳应用潜力

通过直接沉淀法合成了三种镧形态材料，包括所有镧复合材料，并确定了它们的磷酸盐吸附顺序为 La2(CO3)3 > La(OH)3 > La2O3。进一步比较 La2(CO3)3 和 La(OH)3 的吸附性能发现，前者的吸附率是后者的两倍。水中 SO42-、HCO3-、Mg2+ 和 HA 的存在导致 La2(CO3)3 和 La(OH)3 对磷酸盐的吸附量减少，而 Ca2+ 则增强了这两种材料对磷酸的吸附。与 La2(CO3)3 相比，La(OH)3 对共存离子的抗性更强。pH 值是这两种材料吸附磷酸盐的限制因素，随着 pH 值的升高，它们的吸附能力明显下降。La2(CO3)3 的磷酸盐吸附机理是配体交换形成内球络合物，而 La(OH)3 的磷酸盐吸附机理涉及配体交换、内球络合和静电吸引。与 La2(CO3)3 相比，La(OH)3 在 5 次吸附-解吸循环中表现出更高的稳定性。虽然 La2(CO3)3 的初始磷酸盐吸附容量高于 La(OH)3，但经过 5 次吸附-解吸循环后，其磷酸盐吸附容量下降了 40%，而 La(OH)3 则下降了 2.3%。此外，经过五个循环后，La(OH)3 的吸附量比 La2(CO3)3 高出 25.6%，因此，La(OH)3 的再生吸附性能优于 La2(CO3)3。此外，在一项旨在将水中实际磷酸盐浓度降至 0.5 mg/L 的试验中，与 La2(CO3)3 相比，La(OH)3 的用量更少。总之，与 La2(CO3)3 相比，La(OH)3 是一种更适合循环吸附除磷的基质，具有更好的实际应用潜力。总之，与 La2(CO3)3 相比，La(OH)3 被证明是一种更适合循环吸附除磷的基质，并具有更好的实际应用潜力。

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来源期刊

Journal of Environmental Sciences-china 环境科学-环境科学

CiteScore

13.70

自引率

0.00%

发文量

6354

审稿时长

2.6 months

期刊介绍： The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.