Graphitic carbon nitride–doped sewage sludge as a novel material for photodegradation of Eriochrome Black T

Gu, Lin; Dong, Guangxia; Yu, Haixiang; Qiao, Xingbo; Zhang, Kai; Lu, Xiangyu; Wen, Haifeng

Graphitic carbon nitride–doped sewage sludge as a novel material for photodegradation of Eriochrome Black T

2020

The bio-resource utilization of sewage sludge is presented by preparation of novel waste sludge–doped graphite carbon nitride (g-C₃N₄) photocatalyst. The sludge flocs which constitute bacteria and organic substances served as a pore-forming framework in the catalyst, while the inorganic fractions including those transition metals and crustal metals can function as dopants for sludge-based g-C₃N₄ composite. The physicochemical properties of as-prepared catalyst were well analyzed by multiple characterizations. The composite catalyst showed higher surface area (50 m²/g) and more mesoporous structures (8.9 × 10⁻² cm³/g) as compared with pristine g-C₃N₄ (8.4 m²/g and 6.6 × 10⁻² cm³/g, respectively). The photoelectrochemical results showed that introduced sewage sludge impurities lowered down the photocarriers recombination efficiency and enhanced more efficient electron-hole separation by about 100 times. The photocatalytic activity was tested by degradation of typical dye Eriochrome Black T (EBT). The optimal sample improved removal of EBT by 56% in 90 min under ultraviolet irradiation (λ = 254 nm). According to the results of main metal ion leaching concentration and reuse tests, the composite catalyst exhibited excellent stability and repeatability.

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