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    A hierarchically porous and hygroscopic carbon-based catalyst from natural wood for efficient catalytic reduction of industrial high-concentration 4-nitrophenol

    Year: 2022

    Journal: Sep. Purif. Technol., Volume 300, NOV 1

    Authors: Shu, Fan; Wu, Jin; Jiang, Guangpin; Qiao, Yongzhen; Wang, Yilin; Wu, Dandan; Zhong, Yajie; Zhang, Tingwei; Song, Junlong; Jin, Yongcan; Jiang, Bo; Xiao, Huining

    Organizations: National Natural Science Foundation of China [31730106, 31770623]; Natural Science Foundation of Jiangsu Province [BK20220431]; Natural Science Foundation of the Jiangsu Higher Education Institutions of China [21KJB220001]; 333 Project of Jiangsu Province, China [BRA2019070]

    Keywords: Wood 3D-AC; Pd nanoparticles; Hygroscopic behavior; Concentrated 4-nitrophenol; Catalytic reduction

    4-Nitrophenol (4-NP) with high toxicity and non-biodegradability has been causing a great threat to the envi-ronment and human health. Catalytic reduction of high-concentrated 4-NP in wastewater to 4-aminophenol (4 -AP) and the subsequent recovery and reuse of catalysts are highly demanded for the practical treatment of in-dustrial pollutants, yet are still limited in low mass transfer efficiency and poor stability of catalysts. Herein, we developed a composite catalyst of Pd nanoparticles (NPs) decorated 3D-activated carbon (Pd/3D-AC) to syner-gistically catalytic reduce high-concentrated industrial 4-NP (14.38 mM) by using natural wood as a 3D scaffold. The hierarchically porous 3D-AC demonstrates abundant surface-active sites (929 m2.g-1) for adequate and unaggregated anchoring Pd NPs (0.61 %), and the interconnected mass transfer channels and hygroscopic behavior of Pd/3D-AC yield an efficient chemical reaction in solution. As a result, the turnover frequency of the Pd/3D-AC is up to 1.68 min-1, and the synergistic interaction occurs to the 3D-AC and Pd NPs. Even after 10 cycles of catalysis, no deactivation was observed to Pd/3D-AC, demonstrating excellent stability and reusability. Moreover, the Pd/3D-AC catalyst contributes to a high conversion rate to 4-NP, with the yield of obtained 4-AP more than 99.9 % within 10 min. This facile strategy of loading metal nano-catalysts on hierarchically porous wood puts forward a flexible and effective approach for promoting the catalytic performance and the practical treatment of industrial wastewater.
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