标题: Novel calcite-enriched material derived from fly ash for efficient and selective phosphate removal from wastewater

作者: Zhang, SS (Zhang, Shanshan); Lan, JR (Lan, Jirong); Zeng, TY (Zeng, Tianyu); Zhou, M (Zhou, Min); Hou, HB (Hou, Haobo)

来源出版物: SEPARATION AND PURIFICATION TECHNOLOGY  卷: 364  文献号: 132401  DOI: 10.1016/j.seppur.2025.132401  Published Date: 2025 AUG 30  子辑: 1  

摘要: Efficient and selective advanced phosphorus treatment from wastewater remains a significant challenge. In this study, we developed a novel calcite-enriched material (M-Res) for advanced phosphorus recovery from wastewater. This material was synthesized from high-aluminum fly ash through calcination, Na2CO3 leaching, and ball-milling modification. Characterization results indicated that ball-milling introduced lattice defects, creating abundant active calcium sites with a strong affinity for capturing phosphate ions. Batch adsorption experiments demonstrated that M-Res has a high phosphate adsorption capacity of 74.8 mg-P/g and exhibits excellent performance in terms of anti-interference and selective adsorption. When the initial concentration was 10 mg/L, the post-adsorption phosphate concentration met the first-level surface water quality standards (0.02 mg/L, GB 3838-2002). At 50 mg/L, it met the second-level discharge standards for urban sewage treatment plants (3 mg/L, GB 18918-2002). The adsorption mechanism involves the release of Ca2+ from calcite, which interacts with phosphate ions through complexation, surface precipitation, and electrostatic attraction. Derived from a byproduct of high-aluminum fly ash in aluminum extraction processes, M-Res is economical and simple to produce, making it a promising adsorbent for the advanced treatment of low-concentration phosphate.

作者关键词: Phosphate recovery; Wastewater treatment; Aluminum extraction residue; Mechanical modification; Surface precipitation; Calcium carbonate

地址: [Zhang, Shanshan; Zeng, Tianyu; Zhou, Min; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Hou, Haobo] Zhaoqing Wuhan Univ Environm Technol Res Inst, Zhaoqing 526200, Guangdong, Peoples R China.

[Lan, Jirong] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 100872, Peoples R China.

通讯作者地址: Hou, HB (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Lan, JR (通讯作者)，Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 100872, Peoples R China.

电子邮件地址: jironglan@whu.edu.cn; houhb@whu.edu.cn

影响因子：8.2