Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (10): 3125.doi: 10.7503/cjcu20210429

• Physical Chemistry • Previous Articles     Next Articles

Adsorption Reduction of Hexavalent Chromium and co-Catalytic Degradation of Organic Pollutants by Carbon Doped Hexagonal Boron Nitride Supported MoS2

CUI Jinping, CHEN Wenxian, YU Feifan, CAO Shiyu, LYU Weiyang, YAO Yuyuan()   

  1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology,Zhejiang Sci?Tech University,Hangzhou 310018,China
  • Received:2021-06-22 Online:2021-10-10 Published:2021-08-13
  • Contact: YAO Yuyuan E-mail:yyy0571@126.com
  • Supported by:
    the National Natural Science Foundation of China(51772274)

Abstract:

Aiming at the problem of the low Cr(Ⅵ) removal capacity of molybdenum disulfide(MoS2) due to easy agglomeration, dopamine was used to modify hexagonal boron nitride(BN) with excellent adsorption and chemical stability, and then the carbon doped hexagonal boron nitride supported MoS2 nanocomposite (c-BN@MoS2) was obtained by calcination and hydrothermal method, improving the dispersion of MoS2 in the composite materials. The performance of c-BN@MoS2 on the adsorption and reduction of Cr(Ⅵ) and the synergistic catalytic degradation of organic pollutants were deeply investigated at room temperature. The experimental results indicated that the adsorption reduction removal rate of Cr(Ⅵ) at 50 mg/L by c-BN@MoS2 was more than 95% within 40 min. The maximum capacity for Cr(Ⅵ) removal could reach 401 mg/g under pH of 2.0 at 25 ℃, which was obviously higher than that of Cr(Ⅵ) by MoS2(98 mg/g). This may be attributed to the fact that the introduction of c-BN increased the specific surface area and average pore diameter of MoS2, promoting the formation of 1T phase of MoS2, which is conducive to the adsorption of Cr(Ⅵ) and accelerating the electron transfer in the redox process. When c-BN@MoS2 was introduced into the Fe2+/PMS system, the degradation performance of sulfamethoxazole was significantly enhanced, and its reaction rate constant was 4 times as high as that of the Fe2+/PMS system, which was mainly due to the fact that c-BN@MoS2 significantly accelerated the transition from Fe3+ to Fe2+, resulting in more ·OH production, thereby achieving the enhancement effect of pollutants degradation. This paper opens up a new direction for the treatment of heavy metals and organic pollutants in wastewater by hexagonal boron nitride, and provides a useful reference for the efficient treatment of wastewater pollution.

Key words: Hexagonal boron nitride, Molybdenum disulfide, Hexavalent chromium, Organic contaminant

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