Coordination polymer derived Ni based composite material with N-doped mesoporous carbon as matrix for pollutants removal
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To obtain a magnetic composite material for water treatment, a Ni based composite material with nitrogen doped mesoporous carbon as matrix (Ni@NC) has been synthesized with coordination polymer as precursor. In Ni@NC, Ni nanoparticle with the size about 3–5 nm dispersed evenly in nitrogen doped mesoporous carbon matrix. Ni@NC exhibits striking catalytic activity in reductive conversion of 4-nitrophenol to 4-aminophenol with the existence of sodium borohydride (NaBH4). The conversion efficiency reaches almost 100% in 160 s with the amount of Ni@NC as low as 5 mg. After eight successive cycles of reductions, the efficiency still retains above 99%. For a catalyst, chemical content plays an important role in its performance. Here, the influence of nitrogen species on 4-nitrophenol reductive property is discussed in detail, which illustrates pyrrolic N and quaternary N both play significant roles during catalytic reduction process. In addition, Ni@NC also possesses excellent activity in catalytic reduction of organic dyes, such as Rhodamine B (RhB), methyl orange (MO) and methylene blue (MB). Due to its large surface area and suitable pore size, Ni@NC also possesses adsorption removal property towards tetracycline and Cr2O72−. Magnetic measurement reveals ferromagnetic character of Ni@NC, which facilitates its magnetic separation from the treated samples. All these merits make Ni@NC a promising multifunctional environmental material in waste water treatment.
KeywordsCoordination polymer Magnetic material Nitrogen doped carbon matrix Catalytic reduction Adsorption removal
This work was supported by National Natural Science Foundation (21303010) and Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education (130028720) and Fundamental Research Funds for the Central University of Northeastern University (N170504025).
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