Madhusudan Puttaswamy, Kim Jong-Oh
Department of Civil and Environmental Engineering, 222 Wangsimni-ro, Seongdong-gu, Hanyang University, Seoul, 04763, Republic of Korea.
Environ Res. 2025 Oct 1;282:122066. doi: 10.1016/j.envres.2025.122066. Epub 2025 Jun 2.
Eutrophication and phosphorus depletion are the major concerns that have received increasing global attention. This study investigates the adsorption behaviour of phosphate onto α-FeO dendrites, composited with 2D lanthanum sheets adsorbents through comprehensive material characterization and kinetic experiments. The adsorbent was characterized using different analytical techniques to elucidate its structural, morphological, and surface properties. The impact of different lanthanum concentrations on phosphate sorption capacity was studied, and a sample with 0.6 g lanthanum nitrate (sample LF-6) showed exceptional phosphate adsorption performance and were utilized for additional evaluation. Kinetic and isotherm models were applied to describe the adsorption behaviour. The experimental data indicate Langmuir isotherm was most suitable for the adsorption process and the results indicated that pseudo-second-order model best described the adsorption process, suggesting chemisorption as a rate-limited step. The LF-6 demonstrated an outstanding phosphate sorption capacity of 229.66 mg P/g at pH 6.7 and 25 °C, which is roughly 4.1 times greater than that of the α-FeO dendrites (FO). Additionally, the LF-6 sorbent demonstrated exceptional adsorption when co-existing anions were present. After five consecutive cycles, the sorption capacity remained active, demonstrating the adsorbent's excellent regenerative performance. It is anticipated that these sorbents could be practically implicated in wastewater treatment.
富营养化和磷耗竭是受到全球日益关注的主要问题。本研究通过综合材料表征和动力学实验，研究了磷酸盐在与二维镧片吸附剂复合的α-FeO枝晶上的吸附行为。使用不同的分析技术对吸附剂进行表征，以阐明其结构、形态和表面性质。研究了不同镧浓度对磷酸盐吸附容量的影响，含0.6 g硝酸镧的样品（样品LF-6）表现出优异的磷酸盐吸附性能，并用于进一步评估。应用动力学和等温线模型来描述吸附行为。实验数据表明，朗缪尔等温线最适合吸附过程，结果表明伪二级模型最能描述吸附过程，表明化学吸附是限速步骤。LF-6在pH 6.7和25°C下表现出229.66 mg P/g的出色磷酸盐吸附容量，约为α-FeO枝晶（FO）的4.1倍。此外，LF-6吸附剂在存在共存阴离子时表现出优异的吸附性能。经过五个连续循环后，吸附容量仍然有效，表明吸附剂具有出色的再生性能。预计这些吸附剂可实际应用于废水处理。
