纳米片
盐酸四环素
多孔性
核化学
氧化剂
比表面积
浸出(土壤学)
X射线光电子能谱
傅里叶变换红外光谱
微型多孔材料
降级(电信)
化学工程
打赌理论
化学
四环素
吸附
水溶液
催化作用
计算机科学
工程类
有机化学
电信
生物化学
抗生素
环境科学
土壤科学
土壤水分
作者
Prateeksha Mahamallik,Sumana Saha,Anjali Pal
标识
DOI:10.1016/j.cej.2015.04.064
摘要
Highly porous MnO2 nanosheets were prepared from MnCl2 and KMnO4 following a modified co-precipitation route. The material was characterized by XRD, FTIR, TEM, SEM, XPS and BET surface area analysis. The MnO2 material is microporous having surface area 301 m2/g and pore diameter 0.364 nm, and is amorphous in nature. The SEM images show the formation of spherical assembly and TEM images indicate the presence of fine nanosheets within it. The porosity and surface area, as well as the oxidizing property of the as-prepared nano MnO2 have made the material a powerful oxidant for tetracycline hydrochloride (TCH) degradation in aqueous medium under ambient condition. The degradation under various operational conditions was studied and the effects of pH, initial TCH concentration, MnO2 dose, air/O2, temperature, and scavengers were examined. At lower pH, the degradation was more favored. During the oxidative degradation of TCH, slight leaching of Mn2+ was observed. The degradation followed first order rate model in unbuffered condition and second order model under buffered media. About 55% TCH degradation and ∼44% COD removal was observed on 20-min reaction, under unbuffered condition and at initial pH ∼ 4, with 50 mg/L TCH concentration and 1.0 g/L MnO2 dose. However, under similar condition, ∼75% degradation was possible under controlled pH (∼3.48). The material could be reused for two consecutive cycles with significant efficiency. The pharmaceutical products (hostacycline and terramycine, which belongs to TC group of antibiotics) were successfully degraded by the as-prepared nano MnO2 with good performance.
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