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Adsorptive removal of tetracycline from water using Fe(Ⅲ)-functionalized carbonized humic acid

Chinese Journal of Chemical Engineering 2020年第10期28卷 2689-2698页

作者： Dairui Xie Hongcheng Zhang Meng Jiang Hao Huang Heng Zhang Yang Liao Shilin Zhao College of Chemistry and Material Science Sichuan Normal UniversityChengdu 610068China Key Laboratory of Land Resources Evaluation and Monitoring in Southwest Ministry of Education of ChinaChengdu 610068China

Humic acid(HA)was carbonized at 300,400 and 500℃ and then functionalized with 1 wt%–12 wt%Fe(Ⅲ)respectively[CHA300/400/500-Fe(Ⅲ)].Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous tetracycline(TC:25 mg·L^-1)was *** adsorption equilibrium time for CHA400-Fe(Ⅲ)to TC was 6 h faster and the adsorption removal efficiency(Re)was two times higher than that of HA/*** adsorption Reof CHA400-Fe(Ⅲ)loaded 10%iron[CHA400-(10%)Fe(Ⅲ)]to TC could reach 99.8%at 8 h and still kept80.6%after 8 *** adsorption kinetics were well fitted to the pseudo-second-order equation and the adsorption isotherms could be well delineated via Langmuir equations(R^2N 0.99),indicating that the homogeneous chemical adsorption of TC occurred on the *** main adsorption mechanisms of TC were complexation Fe(III)and hydrophobic *** and electronegative repulsion between TC and CHA400-(10%)Fe(Ⅲ)at lowly p H(2)and highly p H(8–10)respectively,leaded to the relatively low adsorption capacity and more notable influence of ion *** the p H was between 4 and 8,TC mainly existed in neutral molecules(TCH2),so the influence of ion concentration was not *** dynamic adsorption results showed that the CHA400-(10%)Fe(Ⅲ)could continuously treat about 2.4 L TC(27 mg·L^-1)wastewater with the effluent concentration as low as 0.068 mg·L^-*** study suggested a broad application prospect of a new,effective,lowcost and environment-friendly adsorbent CHA400-(10%)Fe(Ⅲ)for treatment of low-concentration TC polluted wastewater.

关键词： Fe(Ⅲ)-functionalized carbonized humic acid Composites Adsorption low-concentration tetracycline Waste water

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