Citric acid–enhanced Fe2+ and Cu2+ synergistic activation of persulfate for rhodamine B degradation

• DOI: 10.1016/j.dwt.2024.100195
• Publication Date: 2024-04-04T09:50:30Z
• Authors: Yujing Lin; Xudong Wang; Hongmin Zhang; Yongtao Lv; Licheng Chen; Shumiao Cao
• Keywords: Persulfate; Degradation; Rhodamine B

Citric acid (CA) and Cu2+ were used to enhance Fe2+-activated persulfate (PDS) for rhodamine B (RhB) oxidative degradation. The effects of PDS concentration, Fe2+ CA pH, common inorganic anions in water on activation RhB degradation investigated. Results showed that sulfate hydroxyl radicals the primary active substances reaction system, with radical playing a key role. addition improved efficiency decomposition, achieving removal rate 98.4% after 30 min reaction, governed by pseudo-first-order. presence complexing agent, allows effective over wide pH range. free (SO4·−) concentration increases increasing concentration. However, when was higher than 0.5 mM, self-quenching SO4·− occurred decreased. In contrast, continued increase. process main mechanism decomposition. Analysis intermediates C–C C–N bond cleavage most likely mode contaminants become small molecules.