Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, People's Republic of China.
College of Chemistry & Environmental Sciences, Yili Normal University, Yining, 835000, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Nov;29(54):82584-82599. doi: 10.1007/s11356-022-21556-5. Epub 2022 Jun 25.
This work studies the degradation of chlortetracycline hydrochloride (CTC) by activated peroxymonosulfate (PMS) with natural manganese sand (NMS). Meanwhile, the NMS was characterized and analyzed by isothermal nitrogen adsorption (BET), energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscope (SEM). It can be induced that NMS material may contain C, O, Al, Si, Fe, Mn, and K, and the proportion of each is 6%, 9%, 13%, 34%, 27%, 5%, and 6%. Critical parameters, including initial pH value, catalyst dosage, and PMS amount, were optimized through response surface methodology. One of the essential significances of response surface methodology (RSM) is the establishment and optimization of the mathematical model to reduce the complexity of the experimental process. It can provide the degree of mutual influence between various factors and optimize the response based on the investigated factors. Results indicated that 81.65% of CTC could be degraded under the optimized conditions of PMS amount 2.02 g/L, the NMS dosage 0.29 g/L and pH 3.87. Also, it shows that NMS is the most powerful of each factor on the degradation efficiency. We proposed the degradation pathways of CTC from the liquid chromatograph-mass spectrometer (LC-MS) results. Therefore, NMS could be applied as an efficient activator of peroxymonosulfate to purify the water and wastewater.
本研究采用天然锰砂（NMS）活化过一硫酸盐（PMS）降解盐酸金霉素（CTC）。同时，采用等温热氮气吸附（BET）、能量色散 X 射线光谱（EDS）和扫描电子显微镜（SEM）对 NMS 进行了表征和分析。可以推断，NMS 材料可能含有 C、O、Al、Si、Fe、Mn 和 K，其比例分别为 6%、9%、13%、34%、27%、5%和 6%。通过响应面法优化了初始 pH 值、催化剂用量和 PMS 用量等关键参数。响应面法（RSM）的一个重要意义是建立和优化数学模型，以简化实验过程的复杂性。它可以提供各因素之间相互影响的程度，并根据所研究的因素优化响应。结果表明，在 PMS 用量 2.02 g/L、NMS 用量 0.29 g/L、pH 值 3.87 的优化条件下，81.65%的 CTC 可以被降解。同时，结果表明 NMS 对降解效率的影响最大。根据液质联用（LC-MS）结果提出了 CTC 的降解途径。因此，NMS 可以作为过一硫酸盐的高效活化剂，用于净化水和废水。
