高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (10): 3125.doi: 10.7503/cjcu20210429

• 物理化学 • 上一篇    下一篇

碳掺杂六方氮化硼/二硫化钼吸附还原六价铬和助催化降解有机污染物

崔金萍, 陈温贤, 郁非繁, 曹诗雨, 吕维扬, 姚玉元()   

  1. 浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,杭州 310018
  • 收稿日期:2021-06-22 出版日期:2021-10-10 发布日期:2021-08-13
  • 通讯作者: 姚玉元 E-mail:yyy0571@126.com
  • 基金资助:
    国家自然科学基金(51772274)

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)

摘要:

针对二硫化钼(MoS2)因易团聚导致去除六价铬[Cr(Ⅵ)]容量低的问题, 利用六方氮化硼(BN)良好的吸附性和化学稳定性, 以多巴胺作为BN改性剂, 通过煅烧法和水热法制得碳掺杂六方氮化硼(c-BN)负载MoS2纳米复合材料(c-BN@MoS2). 研究了室温条件下c-BN@MoS2对Cr(Ⅵ)的吸附还原和助催化降解有机污染物的性能. 实验结果表明, c-BN@MoS2在40 min内对50 mg/L的Cr(Ⅵ)吸附还原去除率高达95%以上, 且以将 Cr(Ⅵ)还原至Cr(Ⅲ)为主, 在pH值为2、 温度为25 ℃条件下去除Cr(Ⅵ)最大容量可达401 mg/g, 显著高于 MoS2(98 mg/g). 分析显示, c-BN不仅提高了MoS2的平均孔径, 还可促进MoS2生成金属特性的1T相, 有利于吸附Cr(Ⅵ)和加快氧化还原过程中的电子转移. 在Fe2+/PMS(过一硫酸氢盐)催化体系加入c-BN@MoS2, 该体系对磺胺甲恶唑的降解性能明显增强, 其反应速率常数提高3倍, 这主要归因于c-BN@MoS2明显加快了Fe3+到Fe2+的转变, 导致更多?OH产生, 达到增强降解污染物的目标.

关键词: 六方氮化硼, 二硫化钼, 六价铬, 有机污染物

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

中图分类号: 

TrendMD: