Abstract
In this work, hierarchical structure TiO2/hemp stem biochar carbon (HSBC) and C3N4-TiO2/HSBC were successfully fabricated, which were used as efficient visible-light photocatalyst degradation for ammonia nitrogen from aqueous solution. The as-prepared C3N4-TiO2/HSBC hybrid catalyst showed the higher efficient photocatalytic activity for decomposition of ammonia nitrogen than those of pure TiO2 and TiO2/HSBC, suggesting suppressed recombination of photogenerated charges and promoted mass transfer due to synergistic effect, and thus increased photocatalytic degradation activity. The degradation of ammonia follows a pseudo-first-order kinetics. All prepared catalysts demonstrated extremely photocatalytic efficiency under visible-light and UV light illumination; the ammonia nitrogen photocatalytic degradation activity of C3N4-TiO2/HSBC can reach 90.3% under UV light while the degradation activity achieved about 50.7% under visible-light irradiation. The results revealed that the h+ was dominantly active intermediates in the process of photocatalytic degradation. The prepared catalysts are promising for the degradation of ammonia nitrogen from water resource.
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This work was supported by the Natural Science Foundation of China (Nos. 51908213, 61872141), the Natural Science Foundation of Jiangxi Province (Nos. 20192BAB216029, 20181BAB206037, 20192BCD40013), and State Key Laboratory of Pollution Control and Resource Reuse Foundation (No. PCRRF19015).
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Peng, X., Wang, M., Dai, H. et al. In situ growth of carbon nitride on titanium dioxide/hemp stem biochar toward 2D heterostructured photocatalysts for highly photocatalytic activity. Environ Sci Pollut Res 27, 39198–39210 (2020). https://doi.org/10.1007/s11356-020-09381-0
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DOI: https://doi.org/10.1007/s11356-020-09381-0