Highly efficient adsorption of ethyl mercaptan on hierarchical porous carbon derived from rice husk

IF 4.1 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2024-11-06 DOI:10.1016/j.ces.2024.120915

Hongbo Zhao , Jichao Zhu , Junfeng Wang , Lifang Hu

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Abstract

In this work, rice husk-derived hierarchical porous carbon (HPC) was developed as a high-performance adsorbent for ethyl mercaptan removal. Various characterization methods were used to comprehensively characterize the HPC adsorbent. HPC-2 exhibited an adsorption capacity of 118.1 mg/g for ethyl mercaptan at 500 ppm and a space velocity of 12000 h⁻1, outperforming similar materials reported previously. The high adsorption capacity was attributed to the material’s well-developed microporosity and the abundance of hydroxyl groups (–OH) on its surface, facilitating the chemisorption of ethyl mercaptan. Given the chemically adsorbed nature of sulfur compounds, N₂ thermal regeneration was insufficient to fully recover the adsorbent’s performance. However, oxidative regeneration using O₂/N₂ (3/97 v/v) at 250 °C successfully removed these compounds and restored desulfurization efficiency, likely due to oxygen-assisted reactions on the adsorbent surface. This study provides valuable insights for effectively treating sulfur-containing odorous gases in the air.

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稻壳衍生的分层多孔碳对乙硫醇的高效吸附

本研究开发了稻壳衍生的分层多孔碳（HPC），作为去除硫醇的高性能吸附剂。采用多种表征方法对 HPC 吸附剂进行了全面表征。HPC-2 在硫醇含量为 500 ppm 时的吸附容量为 118.1 mg/g，空间速度为 12000 h-1，优于之前报道的类似材料。高吸附容量归因于该材料发达的微孔和表面丰富的羟基（-OH），这有利于硫醇的化学吸附。鉴于硫化合物的化学吸附性质，氮气热再生不足以完全恢复吸附剂的性能。不过，在 250 °C 下使用 O2/N2（3/97 v/v）进行氧化再生可成功去除这些化合物并恢复脱硫效率，这可能是由于吸附剂表面的氧辅助反应所致。这项研究为有效处理空气中的含硫异味气体提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.