工业水处理 ›› 2025, Vol. 45 ›› Issue (7): 121-129. doi: 10.19965/j.cnki.iwt.2024-0517

• 试验研究 • 上一篇    

活性炭耦合C3N5复合材料的制备及对废水中Cr(Ⅵ)的去除

陈崇明1,2(), 李栋3, 郁金星1,2, 车凯3   

  1. 1. 国网河北能源技术服务有限公司,河北 石家庄 050081
    2. 河北省火力发电节能环保技术创新 中心,河北 石家庄 050081
    3. 国网河北省电力有限公司电力科学研究院,河北 石家庄 050081
  • 收稿日期:2024-10-15 出版日期:2025-07-20 发布日期:2025-07-22
  • 作者简介:

    陈崇明(1983— ),硕士,正高级工程师,E-mail:chencm

  • 基金资助:
    国网河北能源技术服务有限公司项目(TSS2022-05); 10.19965/j.cnki.iwt.2024-0517

Preparation of activated carbon supported C3N5 composite and its removal of Cr(Ⅵ) in wastewater

Chongming CHEN1,2(), Dong LI3, Jinxing YU1,2, Kai CHE3   

  1. 1. State Grid Hebei Energy Technology Service Limited Company, Shijiazhuang 050081, China
    2. Hebei Thermal Power Energy Saving and Environmental Protection Technology Innovation Center, Shijiazhuang 050081, China
    3. Electric Power Research Institute, State Grid Hebei Electric Power Limited Company, Shijiazhuang 050081, China
  • Received:2024-10-15 Online:2025-07-20 Published:2025-07-22

摘要:

为了实现对火力发电厂脱硫废水中高毒性Cr(Ⅵ)的去除,通过原位生长法制备了活性炭(AC)耦合富氮氮化碳(C3N5)复合材料(C3N5/AC),采用X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)、X射线光电子能谱仪(XPS)、N2吸附脱附仪(BET)、紫外可见漫反射光谱仪(UV-vis DRS)、稳态荧光光谱仪(PL)、电化学交流阻抗谱仪(EIS)等对C3N5/AC的物相晶型、特征基团、元素组成、比表面积和孔隙孔径、光谱吸收范围和响应强度、光生载流子复合能力、电荷传导阻力等进行了详细的表征,考察了C3N5/AC处理含Cr(Ⅵ)模拟废水的光催化活性和稳定性。结果表明,AC耦合量为3%(质量分数)时复合材料的比表面积达到了51.24 m2/g,是纯C3N5的8倍。AC耦合提高了C3N5材料的可见光响应强度,实现了光生载流子的高效分离,有效降低了电荷传导阻力。C3N5/AC表现出良好的Cr(Ⅵ)去除活性,AC耦合量3%的C3N5/AC在可见光照射下对Cr(Ⅵ)的去除率达到了92.46%,循环5次后表现出良好的稳定性。推测C3N5/AC光催化去除废水中Cr(Ⅵ)的机理:酸性条件下,e-和O2 ·-将Cr(Ⅵ)还原为Cr(Ⅲ)。

关键词: 活性炭, C3N5, 光催化, 含Cr(Ⅵ)废水, 协同降解

Abstract:

In order to remove highly toxic Cr(Ⅵ) from desulfurization wastewater of thermal power plants, activated carbon(AC) coupled with nitrogen-rich carbon nitride(C3N5) composite (C3N5/AC) was prepared by in-situ growth method. X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), N2 adsorption-desorption isotherms (BET), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), steady-state fluorescence spectroscopy (PL), and electrochemical impedance spectroscopy (EIS) were used to characterize the crystalline phase, characteristic groups, elemental composition, specific surface area and pore size, spectral absorption range and response intensity, photogenerated carrier recombination ability, and charge transfer resistance of C3N5/AC in detail. The photocatalytic activity and stability of C3N5/AC for the treatment of simulated wastewater containing Cr(Ⅵ) were investigated. The results showed that the specific surface area of the composite reached 51.24 m2/g at the AC coupling amount of 3%(mass fraction), which was 8 times that of pure C3N5. AC coupling improved the visible-light response intensity of the material, realized the efficient separation of photogenerated carriers, and effectively reduced the charge transfer resistance. C3N5/AC exhibited excellent Cr(Ⅵ) removal activity. The removal rate of Cr(Ⅵ) by C3N5/AC with 3% AC coupling amount reached 92.46% under visible light irradiation, and showed good stability after 5 cycles. The proposed mechanism for photocatalytic removal of Cr(Ⅵ) from wastewater by C3N5/AC involved the reduction of Cr(Ⅵ) to Cr(Ⅲ) by e- and O2 ·- under acidic conditions.

Key words: activated carbon, C3N5, photocatalysis, Cr(Ⅵ) containing wastewater, synergistic degradation

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