Ca–La layered double hydroxide (LDH) for selective and efficient removal of phosphate from wastewater

废水 氢氧化物 化学 无机化学 磷酸盐 核化学 环境化学 废物管理 制浆造纸工业 环境科学 环境工程 有机化学 工程类
作者
Yuhang Cao,Xuewei Wu,Biqing Li,Xia Tang,Xueran Lin,Pengfei Li,Hang Chen,Fu Huang,Chaohai Wei,Jian Wei,Guanglei Qiu
出处
期刊:Chemosphere [Elsevier BV]
卷期号:325: 138378-138378 被引量:44
标识
DOI:10.1016/j.chemosphere.2023.138378
摘要

Adsorption showed advantages in removing phosphorus (P) at low concentrations. Desirable adsorbents should have sufficiently high adsorption capacity and selectivity. In this study, a Ca-La layered double hydroxide (LDH) was synthesized for the first time by using a simple hydrothermal coprecipitation method for phosphate removal from wastewater. A maximum adsorption capacity of 194.04 mgP/g was achieved, ranking on the top of known LDHs. Adsorption kinetic experiments showed that 0.02 g/L Ca-La LDH could effectively reduce PO43-P from 1.0 to <0.02 mg/L within 30 min. With the copresence of bicarbonate and sulfate at concentrations 17.1 and 35.7 times of that of PO43-P, the Ca-La LDH showed promising selectivity towards phosphate (with a reduction in the adsorption capacity of <13.6%). In addition, four other (Mg-La, Co-La, Ni-La, and Cu-La) LDHs containing different divalent metal ions were synthesized by using the same coprecipitation method. Results showed much higher P adsorption performance of the Ca-La LDH than those LDHs. Field Emission Electron Microscopy (FE-SEM)-Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), and mesoporous analysis were performed to characterize and compare the adsorption mechanisms of different LDHs. The high adsorption capacity and selectivity of the Ca-La LDH were mainly explained by selective chemical adsorption, ion exchange, and inner sphere complexation.
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