Lanthanum molybdate/magnetite for selective phosphate removal from wastewater: characterization, performance, and sorpti
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RESEARCH ARTICLE
Lanthanum molybdate/magnetite for selective phosphate removal from wastewater: characterization, performance, and sorption mechanisms Feng Luo 1 & Xiaonan Feng 1 & Xiaoqing Jiang 1,3 & Aijiao Zhou 1 & Pengchao Xie 1 & Zongping Wang 1 & Tao Tao 1 & Jun Wan 2 Received: 15 June 2020 / Accepted: 9 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Lanthanum molybdate/magnetite (M-La2(MoO4)3) with various LaCl3/Fe3O4 mass ratios was synthesized and optimized for selective phosphate removal from wastewater. M-La2(MoO4)3 (2:1) was selected on the basis of phosphate sorption capacity for further experiments and characterized by a variety of methods. The phosphate sorption kinetics, isotherms, and matrix effect were studied. The maximum sorption capacity at initial pH 7 indicates the possible applicability M-La2(MoO4)3 (2:1) in removing phosphate from the aquatic environment. Phosphate removal by M-La2(MoO4)3 (2:1) with high selectivity was achieved in the presence of other co-existing anions, while calcium and magnesium ions were found to inhibit the sorption process. The sorption isotherm study showed that Freundlich and Sips models fit better the Langmuir model, indicating that heterogeneous multilayer sorption was dominant during the phosphate sorption process. Sorption kinetic results showed that the pseudo-first-order kinetic model can describe well the phosphate sorption process by M-La2(MoO4)3 (2:1). Consecutive sorption–desorption runs showed that M-La2(MoO4)3 (2:1) could be reused for a few cycles. Simultaneous removal of phosphate and organic matter was achieved in real wastewater by using M-La2(MoO4)3 (2:1). The sorption mechanism was inner-sphere complexation. Keywords Phosphate removal . Lanthanum molybdate . Magnetite . Wastewater treatment
Introduction Phosphorus (P) is one of the main factors that cause eutrophication in the aquatic environment. Its global reserves are estimated to be exhausted in the next 50–100 years (Cordell et al. Responsible Editor: Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10807-y) contains supplementary material, which is available to authorized users. * Xiaonan Feng [email protected] * Jun Wan [email protected] 1
School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
School of Environmental Engineering, Wuhan Textile University, Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430200, China
3
Wuhan Planning & Design Co., LTD., Wuhan 430014, China
2011; Dox et al. 2019; Peng et al. 2018). Many countries and regions have thus implemented stringent P concentration standards. The USEPA suggested that the total phosphorus (TP) should be below 50 μg P/L in a stream that enters a lake or reservoir (Loganathan et al. 2014); in Australian and New Zealand, it was recommended that the TP concentration should be < 10–25 μg P/L in fres
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