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• W4309014890 abstract "• Chitosan coating of nZVI@BC aerogel enhanced the adsorption capacity of Cr(VI). • C-nZVI@BC exhibited rapid removal efficiency of Cr(VI) (100 mg/L) for 60% in 1 min. • C-nZVI@BC demonstrated a wide pH range from 2 to 8 with high removal efficiency. • C-nZVI@BC+PS exhibited a higher degradation efficiency for TC and CTC. • C-nZVI@BC has a great potential in the environmental application. Chitosan coated biochar-supported nano zero-valent iron aerogel (C-nZVI@BC) was successfully synthesized for the efficient removal of Cr(VI) from aqueous solution. Results showed that the C-nZVI@BC has a 2.1-fold higher adsorption capacity of Cr(VI) than the uncoated sample. Chitosan coating on nZVI@BC and BC support could prevent the oxidation and agglomeration of nZVI. Ultrafast adsorption of Cr(VI) with 61%, 77%, and 87% of the maximum adsorption capacities were achieved within 1 min with the initial concentrations of Cr(VI) at 100 mg/L, 300 mg/L, and 600 mg/L, respectively. The C-nZVI@BC exhibited high adsorption performance under aerobic conditions, and showed high Cr(VI) removal rates (>83%) in a wide pH range (2–8). Cr(VI) and Cr(III) could be simultaneously removed by C-nZVI@BC, and the key mechanisms were adsorption, reduction, and complexation. The acid and alkali resistance experiment of C-nZVI@BC showed that C-nZVI@BC still has better adsorption capacity of Cr(VI) (96.7 mg/g) in acid environment. The application of C-nZVI@BC in the simulated electroplating wastewater treatment indicated a high removal rate of Cr(VI). C-nZVI@BC could effectively reduce the low concentration of Cr(VI) below the standard of the World Health Organization. The syringe filtration and column adsorption experiments implied the potential of C-nZVI@BC for Cr(VI) removal in groundwater. In addition, C-nZVI@BC could be a direct reducing agent for Cr(VI) and an activator of persulfate (PS) for the degradation of antibiotics, and C-nZVI@BC+PS showed 77% and 82% removal of tetracycline and chlortetracycline within 5 min. Overall, C-nZVI@BC was a suitable adsorbent for pollutant removal." @default.
• W4309014890 created "2022-11-20" @default.
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• W4309014890 date "2023-02-01" @default.
• W4309014890 modified "2023-10-05" @default.
• W4309014890 title "Ultrafast removal of Cr(VI) by chitosan coated biochar-supported nano zero-valent iron aerogel from aqueous solution: Application performance and reaction mechanism" @default.
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• W4309014890 doi "https://doi.org/10.1016/j.seppur.2022.122631" @default.
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