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Summary: In this study, iron-doped cryptomelane manganese oxide (Fe-KMnO) was synthesized by a one-step hydrothermal method to enhance its catalytic performance. The Fe-KMnO/PMS system exhibited higher removal efficiency of tetracycline (TC) compared to the KMnO/PMS system, and showed good potential for practical application and excellent stability. The mechanism of Fe-KMnO activation of peroxymonosulfate (PMS) was further investigated, indicating that Fe participated in the redox reaction of high-valent Mn, promoting PMS activation. Moreover, the Fe site acted as an adsorption site, enhancing the TC enrichment ability of the catalyst and improving the TC removal ability of the Fe-KMnO/PMS system.
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Summary: In this study, Ni@N-MCs catalysts were synthesized by pyrolyzing Ni(II) adsorbed on CTF, which exhibit excellent catalytic reduction ability to Cr(VI), tetracycline, and dyes. The Ni@N-MC550 catalyst, synthesized at 550 degrees C, shows a rapid reduction rate and good reusability due to the uniform dispersion of Ni nanoparticles in the carbon matrix derived from CTFs. Mechanism studies reveal that the reduction of Cr(VI) is attributed to the active H. generated by the catalytic decomposition of HCOOH, while the reduction of tetracycline and dyes is facilitated by the transfer of electrons from BH4- catalyzed by Ni@N-MC550 and NaBH4.
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Xinyu Chen et al.
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Bin Li et al.
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Huidong Liu et al.
Summary: The study prepared biochar from two different types of pharmaceutical sludge activated by NaOH using impregnation and dry mixing methods, analyzing their characteristics and adsorption efficiency for tetracycline. The results showed that biochar prepared by dry mixing activation method had better adsorption performance for tetracycline. The study provides valuable information on the use of biochar derived from pharmaceutical sludge for tetracycline removal from wastewater.
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