Removal of Stabilized Silver Nanoparticles from Surface Water by Conventional Treatment Processes
Open Access
- 1 January 2019
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Advances in Nanoparticles
- Vol. 08 (02), 21-35
- https://doi.org/10.4236/anp.2019.82002
Abstract
Engineered nanomaterials are used in many applications, including pollution sensors, photovoltaics, medical imaging, drug delivery and environmental remediation. Due to their numerous applications, silver nanoparticles (Ag NPs) are receiving a large amount of attention. Ag NPs may occur in drinking water sources either during manufacturing, consumption and/or disposal processes. This potentially leads to the presence of Ag NPs in finished drinking water, which could have public health impacts. The objective of this research was to investigate the removal of several types of stabilized Ag NPs by potable water treatment processes. Specifically, this research achieved these objectives through: 1) Synthesis of Citrate-reduced Ag NPs, Polyvinylpyrrolidone stabilized (PVP) Ag NPs and Branched polyethyleneimine stabilized (BPEI) Ag NPs, 2) Characterization of synthesized Ag NPs to determine their aggregation potential, Zeta potential profiles, (pHpzc) and obtain morphological data from SEM images, and 3) An evaluation of the efficacy of conventional water treatment processes (i.e., coagulation, flocculation, sedimentation and sand filtration) in removing stabilized Ag NPs from natural water. The three NPs were found to be stable at the nano size in natural water. Alum coagulation had no impact on the PVP and BPEI Ag NPs. Flocculation and settling were found to be key steps for removal of these NPs. The three Ag NPs were not permanently removed by means of conventional water treatment processes employed in this study.Keywords
This publication has 27 references indexed in Scilit:
- An evidence-based environmental perspective of manufactured silver nanoparticle in syntheses and applications: A systematic review and critical appraisal of peer-reviewed scientific papersScience of The Total Environment, 2010
- Impact of Environmental Conditions (pH, Ionic Strength, and Electrolyte Type) on the Surface Charge and Aggregation of Silver Nanoparticles SuspensionsEnvironmental Science & Technology, 2010
- Antimicrobial nanomaterials for water disinfection and microbial control: Potential applications and implicationsWater Research, 2008
- Manufactured nanoparticles: An overview of their chemistry, interactions and potential environmental implicationsScience of The Total Environment, 2008
- Estimation of cumulative aquatic exposure and risk due to silver: Contribution of nano-functionalized plastics and textilesScience of The Total Environment, 2008
- Synthesis of Positively Charged Silver Nanoparticles via Photoreduction of AgNO3 in Branched Polyethyleneimine/HEPES SolutionsLangmuir, 2007
- Toxic Potential of Materials at the NanolevelScience, 2006
- Development and Validation of the New EPA Microwave-Assisted Leach Method 3051AEnvironmental Science & Technology, 1998
- Adsorption of Natural Organic Polyelectrolytes by Activated Carbon: A Size-Exclusion Chromatography StudyEnvironmental Science & Technology, 1996
- Soluble polymers in water purificationProgress in Polymer Science, 1995