Adsorption/reduction of N-dimethylnitrosamine from aqueous solution using nano zero-valent iron nanoparticles supported on ordered mesoporous silica

• Published in: Water science & technology. Water supply Vol. 17; no. 4; pp. 1097 - 1105
• Main Authors: Xin, Xiaodong, Sun, Shaohua, Wang, Mingquan, Zhao, Qinghua, Chen, Yan, Jia, Ruibao
• Format: Journal Article
• Language: English
• Published: London IWA Publishing 01.07.2017
• Subjects: Adsorption; Catalysis; Chemical reduction; Chromatography; Drinking water; Environmental science; Ethanol; Experiments; Fourier transforms; Iron; N-Nitrosodimethylamine; Nanocomposites; Nanomaterials; Nanoparticles; Polyethylene; Public health; Removal; Silica; Silicon dioxide; Studies; Surface chemistry; X-ray diffraction; China
• ISSN: 1606-9749; 1607-0798
• DOI: 10.2166/ws.2017.003

N-Dimethylnitrosamine (NDMA) has aroused increasing concern among public health agencies. It is necessary to develop some effective methods to remove NDMA from drinking water. A reductive process has been investigated as an alternative treatment method for NDMA removal from water. In this manuscript, zero-valent iron nanoparticles (ZVINPs) were synthesized, and then supported on mesoporous silica materials with high surface area (MCM-41) to prepare a stable ZVINP/MCM-41 nanocomposite. X-ray diffraction measurements showed the stabilization of the ZVINPs upon their support on MCM-41, which enhanced their activity. The ZVINP/MCM-41 nanocomposite was used for the catalytic reduction of NDMA in the model solution, and the results showed the dependency of the removal process on the ZVINP/MCM-41 mass, time of removal, and solution pH. The mechanism of NDMA reduction by ZVINP/MCM-41 was studied, and the results showed the conversion of NDMA to unsymmetrical dimethylhydrazine, dimethylamine (DMA) and NH4+. The product analysis found that in the process of removal, adsorption and reduction existed at the same time.