High-efficiency sulfur-doped carbon photocatalysts synthesized by carbonization of lignosulfonate at low temperature. (December 2022)

• Record Type: Journal Article
• Authors: Li, Qinfang; Liu, Shaoru; Zhang, Xu; Hu, Gengshen; Xia, Haian
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Sulfur-doping -- Carbon materials -- Photocatalysis -- Tetracycline; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104448
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Heteroatom-doped carbon photocatalysts have attracted increasing attention since they are inexpensive, environmentally friendly, and highly efficient. Herein, sulfur-doped carbon photocatalysts were prepared by a one-step low-temperature carbonization method using sodium lignosulfonate (SLS) as a starting material. The physicochemical properties of the carbon photocatalysts were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS), and so on. Compared with the carbon photocatalyst derived from alkali lignin, the sulfur-doped carbons from SLS can improve the degradation of tetracycline by nearly 40%. Sulfur species, i.e., sulfone and sulfoxide, can reduce the bandgap and promote the separation and transfer of photogenerated charge carriers under visible light irradiation. The recycling experimental results of S-C-N2 -12 illustrate that the catalyst is stable without a remarkable loss in photocatalytic degradation of tetracycline after five successive runs, suggesting that the sulfur-containing species coordinated on the carbon surface are relatively stable. The results of radical-assisted electron spin resonance (ESR) and radical scavenger experiments show that h + plays a major role in the degrading of tetracycline. These findings suggest that the sulfur-doped carbon photocatalysts have a great potential in pollutant degradation and wastewater treatment. Graphical Abstract: ga1 Sulfur-doped carbon materials were prepared by one-step low-temperature carbonization method using sodium lignosulfonate, then it is carried out with it as a catalyst for photocatalytic experiments to degrade tetracycline.