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Boric acid modified zero-valent iron enhanced activation of periodate for sulfamethazine removal: Performance and mechanism
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DOI：10.1016/j.watcyc.2025.12.002.png)
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Abstract
En 中文
This study investigated the enhancement of periodate (PI) activation using boric acid-modified zero-valent iron (BA-ZVI) for the degradation of sulfamethazine (SMT). Only 5.4 % of SMT was removed in 15 min in the ZVI/PI system, while 98.5 % of SMT was removed in 15 min in the BA-ZVI/PI system. A more than 100-fold increase in the pseudo-first-order rate constant for SMT removal was observed in the BA-ZVI/PI system compared to the ZVI/PI system. Characterization of BA-ZVI revealed that BA-ZVI contained lower corrosion potential, higher proportion of Fe2+, lower contact angle suggesting the better activity and the presence of B on the BA-ZVI surface could accelerate the recycle of Fe2+. Density functional theory (DFT) calculations further revealed that the adsorption energy of PI on the BA-ZVI surface was lower than that on the ZVI surface. center dot OH, O2 center dot-, 1O2, IO3 center dot and FeIV were all involved in the removal of SMT, and center dot OH played most important role in BA-ZVI/PI system. The generation of intermediates during SMT degradation effectively mitigated overall toxicity, while PI remained stable and did not convert into hazardous iodine compounds. Various affecting factors affecting the SMT removal in BA-ZVI/PI system were also conducted. BA-ZVI/PI system had good recycle ability, better performance for treating various antibiotics and kept good performance for antibiotic in natural freshwater. To summarize, the present study (BA-ZVI/PI system) provides environmentally friendly methods for removing antibiotics.
Keywords:
Boric acid modified zero-valent iron
Periodate
Density functional theory
Characterization
Natural fresh water
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