Study on the Adsorption Performance and Mechanism of Municipal Sewage Sludge Biochar for Antimony in Water
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 perfor-mance 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 mu-nicipal sewage sludge biochar(SSB900)prepared at 900 ℃ 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 capac-ity 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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