Preparation of Sulfur-doped Porous Carbon and Its Electro-adsorption Performance for Heavy Metals in Desulfurization Wastewater

doi:10.12096/j.2096-4528.pgt.21128

Abstract

Abstract:

Heavy metal pollution in desulfurization wastewater from coal-fired power plants has huge potential harm to the environment. Among them, the problem of heavy metal ions such as Pb²⁺, Cd²⁺ and Cr³⁺ is particularly prominent. Efficient and targeted removal of relevant heavy metal ions is a huge challenge for wastewater purification. For this reason, sulfur-doped porous carbon materials were prepared by template method to selectively remove heavy metal ions from wastewater with electro-adsorption. The results show that the removal efficiency of Pb²⁺, Cd²⁺ and Cr³⁺ in wastewater can still reach 99% after 5 cycles. The electric adsorption experiment was carried out for the actual desulfurization wastewater from a coal-fired power plant in northern China, the mass concentrations of Pb²⁺, Cd²⁺ and Cr³⁺ could be effectively reduced to less than 0.2 μg/L. Through structural, morphological and electrochemical characteri-zation, it is found that S/PC₃ has excellent ion transport channels (mesoporous ratio is 91.06%) and electrochemical performance (117.3 F/g, 1 A/g). At the same time, the appropriate sulfur doping amount improves the site activity of sulfur-doped carbon materials, and makes the sulfur atoms (Lewis soft base) with heavy metal ions (Lewis soft acid) combine.

Key words: coal-fired power plant, sulfur-doped porous carbon, flue gas desulfurization, desulfurization wastewater, heavy metal, electro-adsorption

CLC Number:

TK 09

Taozhu YIN, Yongsheng ZHANG, Tao WANG, Jiawei WANG. Preparation of Sulfur-doped Porous Carbon and Its Electro-adsorption Performance for Heavy Metals in Desulfurization Wastewater[J]. Power Generation Technology, 2023, 44(3): 382-391.

Figures/Tables 7

Fig. 1 Schematic diagram of sulfur-doped porous carbon synthesis and electro-adsorption experiment

Fig. 2 Schematic diagram of capacitive deionization module and its components

Fig. 3 Electrochemical properties of materials

Fig. 4 Electro-adsorption performance of S/PC3 electrode for heavy metal ions in wastewater

Fig. 5 SEM images of S/PC1, S/PC2, S/PC3 and S/PC4 materials under different magnifications

Fig. 6 N2 adsorption-desorption and pore size distribution curves of different materials

Fig. 7 Thermal analysis curves of materials

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