市政污泥生物炭对水中锑的吸附性能和机制研究
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作者单位:

1.宿州学院资源与土木工程学院,安徽 宿州 234000;2.日照市政务服务中心,山东 日照 276800

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国家自然科学基金项目(42207305);宿州学院优秀学术技术骨干项目(2024XJGG12);宿州学院博士后科研启动项目(2021bsh002)。


Study on the Adsorption Performance and Mechanism of Municipal Sewage Sludge Biochar for Antimony in Water
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Affiliation:

1.School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, Anhui, China;2.Rizhao Municipal Government Affairs Service Center, Rizhao 276800, Shandong, China

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    摘要:

    为践行“以废治废,循环利用”理念,同步实现污泥资源化和废水锑污染修复,以富铁市政污泥为原料制备市政污泥生物炭(sewage sludge biochar,SSB)用于水体三价锑(Sb(Ⅲ))的吸附性能与机制研究。探究了炭化温度、溶液pH、Sb(Ⅲ)初始质量浓度及反应温度对SSB吸附水中Sb(Ⅲ)的影响,并采用傅立叶红外光谱(FTIR)和X射线光电子能谱(XPS)对吸附Sb(Ⅲ)前后900 ℃制备的市政污泥生物炭(SSB900)进行表征,以揭示SSB900对Sb(Ⅲ)的潜在吸附机制。单因素吸附试验结果表明,相比炭化温度为300、500、700 ℃的市政污泥生物炭(SSB300、SSB500、SSB700),SSB900具有更强的Sb(Ⅲ)吸附能力;在最佳反应条件下,即Sb(Ⅲ)初始质量浓度7.5 mg/L,pH 3,反应温度35 ℃,其最大吸附量为4 586.38 μg/g。利用FTIR和XPS表征技术,初步阐明了SSB900对Sb(Ⅲ)的吸附机制;Sb(Ⅲ)被SSB900中的腐蚀后零价铁氧化成Sb(V),再以Fe-O-Sb健的形式吸附在SSB900表面。900 ℃制备的市政污泥生物炭可作为一种低成本且有效的Sb(Ⅲ)废水吸附剂。

    Abstract:

    To practice the concept of "treating waste with waste and recycling", and simultaneously realize the resource utilization of sludge and the remediation of antimony (Sb(Ⅲ)) pollution in wastewater, the sewage sludge rich in iron was used as the raw material to prepare municipal sewage sludge biochar (SSB) for the study on the adsorption performance and mechanism of trivalent antimony (Sb(Ⅲ)) in water. The effects of carbonization temperature, solution pH, initial concentration of Sb(Ⅲ), and reaction temperature on the adsorption of Sb(Ⅲ) by SSB were investigated. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the municipal sewage sludge biochar (SSB900) prepared at 900 °C before and after the adsorption test of Sb(Ⅲ) so as to reveal the potential adsorption mechanism of SSB900 for Sb(Ⅲ). The single factor adsorption results indicated that compared to municipal sludge biochar prepared at 300, 500, and 700 ℃ (SSB300, SSB500, SSB700), SSB900 has a higher Sb(Ⅲ) adsorption capacity. The optimal reaction conditions for the adsorption of Sb(Ⅲ) by SSB900 were as follows: the initial mass concentration of Sb ( III ) was 7.5 mg/L, pH 3, reaction temperature of 35 ℃, and the maximum adsorption capacity was 4 586.38 μg/g. In this study, the proposed adsorption mechanism of Sb(Ⅲ) on SSB900 is elucidated using FTIR and XPS techniques, and Sb(Ⅲ) is oxidized to Sb(V) during the corrosion of zero-valent iron (ZVI) on SSB900, and then adsorbed on the surface of SSB900 in the form of Fe-O-Sb bonds. SSB900 prepared at 900 ℃ could be used as a low-cost and effective adsorbent for Sb(Ⅲ)-containing wastewater.

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付敦,苑芳惠,周杰.市政污泥生物炭对水中锑的吸附性能和机制研究[J].西昌学院学报(自然科学版),2024,38(4):56-64.

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  • 收稿日期:2024-09-28
  • 最后修改日期:2024-11-01
  • 录用日期:2024-11-15
  • 在线发布日期: 2025-01-24