Characteristics of biological manganese oxides produced by manganese-oxidizing bacteria H38 and its removal mechanism of oxytetracycline

被引:7
作者
Liu, Changrui [1 ]
Shi, Baihui [1 ]
Guo, Yuchen [1 ]
Wang, Lanjun [1 ]
Li, Shuhan [1 ]
Zhao, Changyu [1 ]
Zhu, Lusheng [1 ]
Wang, Jun [1 ]
Kim, Young Mo [2 ]
Wang, Jinhua [1 ,3 ]
机构
[1] Shandong Agr Univ, Key Lab Agr Environm Univ Shandong, Coll Resources & Environm, Natl Engn Res Ctr Efficient Utilizat Soil & Fertil, Tai An 271018, Peoples R China
[2] Hanyang Univ, Dept Civil & Environm Engn, Seoul 04763, South Korea
[3] Shandong Agr Univ, Coll Resources & Environm, 61 Daizong Rd, Tai An 271018, Peoples R China
基金
中国国家自然科学基金;
关键词
Manganese -oxidizing bacteria; Biological manganese oxides; Oxytetracycline; Removal effect; Removal mechanism; PUTIDA STRAIN MNB1; WASTE-WATER; MN(II) OXIDATION; DEGRADATION; TETRACYCLINE; ANTIBIOTICS; EFFICIENT; TRANSFORMATION; ADSORPTION; CATALYST;
D O I
10.1016/j.envpol.2024.123432
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Oxytetracycline (OTC) is widely used in clinical medicine and animal husbandry. Residual OTC can affect the normal life activities of microorganisms, animals, and plants and affect human health. Microbial remediation has become a research hotspot in the environmental field. Manganese oxidizing bacteria (MnOB) exist in nature, and the biological manganese oxides (BMO) produced by them have the characteristics of high efficiency, low cost, and environmental friendliness. However, the effect and mechanism of BMO in removing OTC are still unclear. In this study, Bacillus thuringiensis strain H38 of MnOB was obtained, and the conditions for its BMO production were optimized. The optimal conditions were determined as follows: optimal temperature = 35 degrees C, optimal pH = 7.5, optimal Mn(II) initial concentration = 10 mmol/L. The results show that BMO are irregular or massive, mainly containing MnCO3, Mn2O3, and MnO2, with rich functional groups and chemical bonds. They have the characteristics of small particle size and large specific surface area. OTC (2.5 mg/L) was removed when the BMO dosage was 75 mu mol/L and the solution pH was 5.0. The removal ratio was close to 100 % after 12 h of culture at 35 degrees C and 150 r/min. BMO can adsorb and catalyze the oxidation of OTC and can produce center dot O-2(-), center dot OH, O-1(2), and Mn(III) intermediate. Fifteen products and degradation pathways were identified, and the toxicity of most intermediates is reduced compared to OTC. The removal mechanism was preliminarily clarified. The results of this study are convenient for the practical application of BMO in OTC pollution in water and for solving the harm caused by antibiotic pollution.
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页数:13
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