Effects of Aging on Adsorption of Tetracycline Hydrochloride by Humin

Hongbo Hou, Guoliang Xu, Fei He and Hua Pan ()
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Hongbo Hou: Department of Resource and Environment, Baoshan College, Baoshan 678000, China
Guoliang Xu: Department of Resource and Environment, Baoshan College, Baoshan 678000, China
Fei He: School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Hua Pan: Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, College of Biological and Environment Engineering, Zhejiang Shuren University, Hangzhou 310015, China

IJERPH, 2023, vol. 20, issue 4, 1-10

Abstract: To explore the effects of “aging”, an environmental factor, on adsorption of tetracycline hydrochloride (TC) by humin (HM), this paper coats HM surface with ferric hydroxide precipitate to simulate the aging process. The research findings indicate that compared with fresh HM, aged HM (HM-Fe) displays an accelerated adsorption rate and higher adsorption capacity on TC. With an initial concentration of 20 mg·L −1 , TC’s equilibrium adsorption capacity on HM and HM-Fe is 4.6 and 5.3 mg·g −1 , respectively, whereas the corresponding initial adsorption rate is 0.036 and 0.132 mg·g −1 ·min −1 . The pseudo-second-order kinetic model and Freundlich adsorption isotherm model could adequately simulate the adsorption process of TC by HM and HM-Fe, suggesting the occurrence of chemical adsorption and multimolecular layer adsorption between TC and HM and HM-Fe. Based on ΔAbs deduced from Job’s calculation, it can be assumed a complex reaction occurs between the iron element on the HM-Fe surface and TC, which acts as a sort of bridge in strengthening the adsorption of TC by HM-Fe. The aforesaid findings may provide subsequent further study on environmental behaviors of TC in the soil with both fundamental theories and a scientific basis.

Keywords: adsorption; tetracycline; humin; aging; ferric hydroxide (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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