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Phosphate removal from actual wastewater via La(OH)(3)-C3N4 adsorption: Performance, mechanisms and applicability

文献类型： 外文期刊

作者： Yin, Xuejie 1 ; Li, Xin 3 ; Petropoulos, Evangelos 4 ; Feng, Yanfang 1 ; Yang, Bei 2 ; Xue, Lihong 1 ; Yang, Linzhang 1 ; He, Shiying 1 ;

作者机构： 1.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing, Jiangsu, Peoples R China

3.Nanjing Forest Univ, Coll Chem Engn, Nanjing, Jiangsu, Peoples R China

4.Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

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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