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<p>Carbonyl sulfide (COS) is a colorless and highly toxic gas with a noxious odor resembling rotten eggs. Conversely, carbide slag (CS) is an alkaline industrial waste byproduct that shows promise for effectively removing acidic gases. This article investigates the performance and reaction mechanism of COS removal from modified CS by using NaOH modified CS and characterization methods such as N<sub>2</sub> adsorption–desorption (N<sub>2</sub>-BET), scanning electron microscopy and energy spectrometer (SEM–EDS), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectrometer (FTIR), etc. The results showed that the optimum penetration adsorption amount was 74.9 mg/g at a roasting temperature of 800℃, a roasting time of 6 h, and a NaOH additive amount of 25% when the inlet concentration, temperature, and airspeed were 800 mg/m<sup>3</sup>, 25℃, and 6034 h<sup>−1</sup>, respectively. At the same time, the detection of the S 2p peak in XPS also confirmed that sulfur in COS can be efficiently removed. It is preliminarily inferred that CS mainly removes COS through acid–base adsorption, catalytic hydrolysis, and oxidation reactions. This provides new ideas for the resource utilization of CS under low temperature conditions and the economical and efficient removal of COS.</p>

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Adsorptive Removal of COS Gas using a Modified Carbide Slag as Low-Cost Adsorbent

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Siyi Peng,
  • Yonglan Zong,
  • Feng Zhu,
  • Kailin Chen,
  • Jie Zhao,
  • Jie Yang,
  • Xiaofeng Huang,
  • Ming Jiang

摘要

Carbonyl sulfide (COS) is a colorless and highly toxic gas with a noxious odor resembling rotten eggs. Conversely, carbide slag (CS) is an alkaline industrial waste byproduct that shows promise for effectively removing acidic gases. This article investigates the performance and reaction mechanism of COS removal from modified CS by using NaOH modified CS and characterization methods such as N2 adsorption–desorption (N2-BET), scanning electron microscopy and energy spectrometer (SEM–EDS), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectrometer (FTIR), etc. The results showed that the optimum penetration adsorption amount was 74.9 mg/g at a roasting temperature of 800℃, a roasting time of 6 h, and a NaOH additive amount of 25% when the inlet concentration, temperature, and airspeed were 800 mg/m3, 25℃, and 6034 h−1, respectively. At the same time, the detection of the S 2p peak in XPS also confirmed that sulfur in COS can be efficiently removed. It is preliminarily inferred that CS mainly removes COS through acid–base adsorption, catalytic hydrolysis, and oxidation reactions. This provides new ideas for the resource utilization of CS under low temperature conditions and the economical and efficient removal of COS.