Mechanism of phosphate adsorption on superparamagnetic microparticles modified with transitional elements: Experimental observation and computational modelling. (November 2020)

• Record Type: Journal Article
• Authors: Zhao, Qian; Liu, Chengfang; Song, Hongquan; Liu, Yu; Wang, Hongbo; Tian, Fuyang; Meng, Shujun; Zhang, Kefeng; Wang, Ning; Mu, Ruimin; Li, Mei
• Is Part Of: Chemosphere. Volume 258(2020)
• Publication Date: 2020-11
• Subjects: Phosphate recovery -- Microparticle sorbent -- Transitional elements -- Adsorption -- Reusability -- Pseudo-atom model; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127327
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Microparticle sorbents (MPSs) containing nano-Fe3 O4 core, nano-layered double hydroxides shell modified with different transitional elements (TE-MPSs) are effective for capturing phosphate from wastewater. In present article, different TE-MPSs loaded with Ce, La, Zr and Hf were synthesized and the phosphorous removal performances were compared. The molecular-level mechanism of phosphate adsorption was successfully simulated by pseudo-atom model based on virtual crystal approximation method, which was in line with the spectroscopic data. The results confirmed the inter-sphere complexation reaction between phosphate and TE-MPSs under neutral pH. And the adsorption mechanism probably changed during cycles of adsorption/regeneration. As revealed by elemental composition analysis, ion exchange mechanism probably played an important part in phosphate adsorption in Cycle 1 while the ligand complexation became dominant after regenerated with NaOH in the following cycles. This work indicates that the highly effective, easily separable and repeatedly usable TE-MPSs has the potential for phosphate sequestration and recovery from sewage wastewater. Highlights: EM-MPSs were developed to recovery phosphate from DSL and DSW. Inner-sphere complexation was the dominant adsorption mechanism of P with TE-MPSs. Ion exchange probably dominated in the P adsorption with TE-MPSs in Cycle 1.