Phosphate removal from actual wastewater via La(OH)(3)-C3N4 adsorption: Performance, mechanisms and applicability
文献类型： 外文期刊
第一作者： Yin, Xuejie
作者： Yin, Xuejie;Feng, Yanfang;Xue, Lihong;Yang, Linzhang;He, Shiying;Yin, Xuejie;Feng, Yanfang;Yang, Bei;Xue, Lihong;He, Shiying;Li, Xin;Petropoulos, Evangelos
作者机构：
关键词： Lanthanum; Carbon nitride; Phosphate adsorption; Wastewater treatment
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）
ISSN： 0048-9697
年卷期： 2022 年 814 卷
页码：
收录情况： SCI
摘要： In this study, La(OH)(3) nanoparticles were immobilized on C3N4 to effectively restrict their aggregation and subsequently enhance the La utilization efficiency to promote phosphate adsorption. The prepared La(OH)(3)-C3N4 nanocomposite was characterized by SEM, XRD, FTIR, XPS, BET and Zeta potential analysis. Batch and continuously-fed (fixed-bed column) experiments to assess the adsorption performance of La(OH)(3)-C3N4 showed that the composite exhibits superior utilization efficiency, resulting to relatively quick adsorption with a short equilibrium time of 30 min. The theoretical maximum P adsorption capacity reached the 148.35 mg.g(-1), efficiency that remained unaffected by the anions and HA present. The adsorption mechanism showed stability in a wide pH range (4.0-11.0) and is considered effective even after extensive use (five-cycles). The dynamics of the adsorption capacity and the half-penetration time values were estimated by 'Thomas' and 'Yoon-Nelson' models showed that are better represented from the experimental values obtained from the fixed-bed column trial. The adsorption mechanisms were attributed to surface precipitation, electrostatic attraction, and inner-sphere complexation via ligand exchange. Furthermore, La(OH)(3)-C3N4 demonstrated high efficiency in scavenging phosphate from both diluted and concentrated wastewater (natural pond and swine wastewater respectively). The above confirm that La(OH)(3)-C3N4 is a promising composite material for phosphate management in aqueous environments.
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