Nanoscale Lanthanum Carbonate Hybridized with Polyacrylic Resin for Enhanced Phosphate Removal from Secondary Effluent

Abstract

The removal of phosphate from water has attracted increasing attention because of the dominant role of phosphate in eutrophication. In this study, a novel nanoscale hybridized adsorbent, NLC@213, was fabricated by immobilizing nanosized lanthanum carbonate (NLC) into the pores of the macro-porous polyacrylic anion exchanger D213 through an in-situ precipitation method for phosphate adsorption from wastewater. NLC@213 exhibited excellent pH tolerance and possessed a high selectivity for phosphate in the presence of competing anions (Cl − , NO 3 − , SO 4 2− , SiO 3 2− , and HCO 3 2− ) and organic acids (humic, tannic, and gallic acids). The maximum phosphate adsorption capacity reached 53.64 mg P/g at 30 °C. Moreover, fixed-bed column adsorption experiments demonstrated that NLC@213 could effectively treat 2400 bed volumes of real secondary effluent (phosphate concentration decreased from 2.0 to <0.5 mg P/L). The exhausted NLC@213 could be regenerated easily using a binary solution of NaCl (1.5 mol/L)−Na 2 CO 3 (3 mol/L), and no significant capacity loss was observed during the recycling for column adsorption−desorption. The underlying mechanism of phosphate adsorption was investigated by a combination of Fourier-transform infrared, transmission electron microscopy, and X-ray photoelectron spectroscopy, and the formation of LaPO 4 •xH 2 O was suggested to be the main pathway in the separation process of phosphate from real secondary effluent.

Understanding the effect of surfactants’ hydrophobicity on the growth of lanthanum sulfide nanospheres in water-in-oil microemulsions: a detailed dynamic light scattering, small angle X-ray scattering, and microscopy study

“…Currently, a number of processes, including hydrothermal synthesis, co-precipitation, sonochemical methods and sol-gel procedures, can be used to synthesise monodispersed nanoparticles. 1,3,[6][7][8] But nowadays, the synthesis of nanomaterials frequently uses microemulsions as templates. [1][2][3][4] The primary benefits of employing microemulsions (usually W/O microemulsions, also known as reverse micelles) for the synthesis of nanoparticles are their pragmatic ability to control the size and size distribution of the particles, and their shape.…”

Comparison of fluorine removal performance and mechanism of spheroidal magnesium oxide before and after lanthanum modification

“…Figure 5.b shows the infrared spectra of 15LSMO before and after uorine adsorption. We can nd that the continuous double peak at 1463cm − 1 is the typical infrared characteristic of lanthanum carbonate (Sun et al 2020). Compared with the one before the adsorption in Fig.…”

Phosphate removal and recovery by lanthanum-based adsorbents: A review for current advances

“…Ion exchange resin is the preferred matrix material because of its high adsorption and regeneration ability. Sun et al (2020) fixed nanosized lanthanum carbonate (NLC) into the pores of macro-porous polyacrylic anion exchanger D213 by in-situ precipitation method, and prepared a novel nanoscale hybridized NLC@213. Its maximum adsorption capacity is 53.64 mg/g at 30℃ and there is no obvious capacity loss during the column adsorption-desorption cycle.…”