Background: As one of the modal antibiotics in life, the abuse of tetracycline (TC) caused great risks to the ecological environment and health. Cost-effective removal method of TC in the medical wastewater was a developmental research direction with great potential.Results: In this work, a novel material, modified kaolin/β-cyclodextrin (β-CD) coated A (A is a special oxidant made from our laboratory, which is mainly composed of potassium ferrate) was synthesized and characterized. Meanwhile, the removal efficiencies and influencing factors of TC in novel material activation reaction systems were systematically studied. The specific surface area of modified kaolin (MMK) can reach up to 431.82 m 2 /g after acid and calcination modification. The results of SEM, TEM, XRD, and FT-IR showed the significant increase in specific surface area of MMK was the complete destruction of kaolin structure and the leaching of aluminum. β-CD was selected to coat A to attenuate the rapid release of A in water. The optimal coat molar ratio of β-CD and A was 10: 1 (β-CD:A). MMK/β-CD-A was used to treat the simulated TC wastewater, the removal efficiency was 95.6 % within 90 min when the concentration of TC was 0.22 mmol/L. The removal mechanism of TC with MMK/β-CD-A was the adsorption effect from MMK and the oxidation effect from β-CD-A.
Conclusion:This work could provide useful information for developing a simple and effective technology to treat TC in medical wastewater.
With the development of the chemical industry, benzene, toluene, ethylbenzene, and xylene (BTEX) have gradually become the major indoor air pollutants. Various gas treatment techniques are widely used to prevent the physical and mental health hazards of BTEX in semi-enclosed spaces. Chlorine dioxide (ClO2) is an alternative to chlorine as a secondary disinfectant with a strong oxidation ability, a wide range of action, and no carcinogenic effects. In addition, ClO2 has a unique permeability which allows it to eliminate volatile contaminants from the source. However, little attention has been paid to the removal of BTEX by ClO2, due to the difficulty of removing BTEX in semi-enclosed areas and the lack of testing methods for the reaction intermediates. Therefore, this study explored the performance of ClO2 advanced oxidation technology on both liquid and gaseous benzene, toluene, o-xylene, and m-xylene. The results showed that ClO2 was efficient in the removal of BTEX. The byproducts were detected by gas chromatography-mass spectrometry (GC-MS) and the reaction mechanism was speculated using the ab initio molecular orbital calculations method. The results demonstrated that ClO2 could remove the BTEX from the water and the air without causing secondary pollution.
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