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        Activated carbon modified by Mo-doped CQDs: An efficient method to reduce the thermal hazard in toluene adsorption

        Hongwei Ren,Hongyu Dong,Tengda Zhao,Zhongqing Yan,Benzhen Jia,Liang Han,Jinfeng Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-

        Activated carbon (AC) is one of the typical adsorbents for industrial treatment of VOCs, but AC itself has ahigh calorific value. When the heat generated by low-temperature oxidation cannot be released, it is easyto store heat and oxidize spontaneously, resulting in immeasurable harm. Therefore, it is important tostudy and improve the thermal stability of AC. In this study, Mo-doped carbon quantum dots (CQDs)was synthesized to enhance the safety of AC usage. The structure of AC before and after modificationwas characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy(FT-IR) and X-ray diffractometer (XRD). On the modified Mo-doped CQDs/AC, there are more crystallinestructures formed by Mo oxides on the surface, which makes the intermolecular force on the surface ofAC increase. At the same time, Mo oxide has strong oxidation resistance, which can inhibit the thermaldecomposition process of AC, and has stronger stability. The spontaneous combustion tendency and thermalhazard of AC before and after modification were greatly improved. The heat released in the tolueneadsorption by the modified AC at different temperatures was significantly lower than the heat released bythe unmodified AC. According to the Langmuir adsorption isotherm, the adsorption performance of ModopedCQDs (2.5 wt%) was 1.6 times higher than that of AC when the system was 25 C. The resultsshowed that Na2MoO4 CQDs modified AC could effectively improve the thermal stability and greatlyreduce the spontaneous combustion tendency. A relative fire safety performance evaluation model wasalso established to comprehensively evaluate the fire risk of VOCs treatment by AC.

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