Lanthanum oxide nanorods for enhanced phosphate removal from sewage: A response surface methodology study

Chemosphere
Liping FangIrene M C Lo

Abstract

Lanthanum-based adsorbents are ideal candidates for phosphate removal because of their excellent affinity to phosphate. However, their application in the removal of trace-levels of phosphate from sewage is still unsatisfactory due to the limited adsorption capacity and inadequate optimization of the operational parameters. To overcome these drawbacks, we have developed a novel lanthanum hydroxide (LH), using a facile precipitation and hydrothermal process that involves a nanorod-like structure with the lengths ranging from 124 to 1700 nm, depending on the La/OH molar ratio. The phosphate adsorption capacity of the developed LH is up to 170.1 mg-P g-1 in synthetic water, while a slightly lower adsorption capacity of 111.1 mg-P g-1 is observed in a sewage sample. A polynominal model consisting of three variables (i.e. dosage, reaction time and initial phosphate concentration) for predicting efficiency of phosphate removal has been successfully developed using a face-centred central composite design (CCD)-based methodology. The results also suggest a strong interactive effect of the dosage with the phosphate concentration, and reaction time, which can significantly affect the optimization of the phosphate removal by LH. Both X-ray...Continue Reading

Citations

Nov 18, 2018·Applied Microbiology and Biotechnology·Xia KangGeoffrey Michael Gadd
Jul 3, 2021·Journal of Environmental Sciences (China)·Shaopeng ZhangWeiben Yang
Jun 27, 2019·Environmental Science & Technology·Jie YuJiuhui Qu
Aug 25, 2021·Chemosphere·Anitha KunhikrishnanChengrong Chen
Oct 27, 2021·The Science of the Total Environment·Muhammad AkramQinyan Yue

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