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Aggregation and disaggregation of ZnO nanoparticles: influence of pH and adsorption of Suwannee River humic acid.
Sci Total Environ. 2014 Jan 15; 468-469:195-201.ST

Abstract

The surface charge and average size of manufactured ZnO nanoparticles (NPs) were studied as a function of pH to understand the aggregation behavior and importance of the electrostatic interactions in solution. The interactions between ZnO and Suwannee River humic acid (SRHA) were then investigated under a range of environmentally relevant conditions with the ZnO nanoparticles pHPZC as the point of reference. The anionic charges carried by aquatic humic substances were found to play a major role in the aggregation and disaggregation of ZnO nanoparticles. At low concentrations of SRHA (<0.05 mg/L) and below the pHPZC, anionic SRHA was rapidly adsorbed onto the positively charged ZnO NPs hence promoting aggregation. With similar SHRA concentrations, at pHPZC, SRHA was able to control the suspension behavior of the ZnO and promote partial disaggregation in small volumes. This was more distinguishable when the pH was greater than pHPZC as SRHA formed a surface coating on the ZnO nanoparticles and enhanced stability via electrostatic and steric interactions. In most cases, the NP coating by SRHA induced disaggregation behavior in the ZnO nanoparticles and decreased the aggregate size in parallel to increasing SRHA concentrations. Results also suggest that environmental aquatic concentration ranges of humic acids largely modify the stability of aggregated or dispersed ZnO nanoparticles.

Authors+Show Affiliations

F.-A. Forel Institute, University of Geneva, 10 route de Suisse, 1209 Versoix, Switzerland. Electronic address: mohdoma9@etu.unige.ch.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24029691

Citation

Mohd Omar, Fatehah, et al. "Aggregation and Disaggregation of ZnO Nanoparticles: Influence of pH and Adsorption of Suwannee River Humic Acid." The Science of the Total Environment, vol. 468-469, 2014, pp. 195-201.
Mohd Omar F, Abdul Aziz H, Stoll S. Aggregation and disaggregation of ZnO nanoparticles: influence of pH and adsorption of Suwannee River humic acid. Sci Total Environ. 2014;468-469:195-201.
Mohd Omar, F., Abdul Aziz, H., & Stoll, S. (2014). Aggregation and disaggregation of ZnO nanoparticles: influence of pH and adsorption of Suwannee River humic acid. The Science of the Total Environment, 468-469, 195-201. https://doi.org/10.1016/j.scitotenv.2013.08.044
Mohd Omar F, Abdul Aziz H, Stoll S. Aggregation and Disaggregation of ZnO Nanoparticles: Influence of pH and Adsorption of Suwannee River Humic Acid. Sci Total Environ. 2014 Jan 15;468-469:195-201. PubMed PMID: 24029691.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Aggregation and disaggregation of ZnO nanoparticles: influence of pH and adsorption of Suwannee River humic acid. AU - Mohd Omar,Fatehah, AU - Abdul Aziz,Hamidi, AU - Stoll,Serge, Y1 - 2013/09/09/ PY - 2013/07/12/received PY - 2013/08/14/revised PY - 2013/08/14/accepted PY - 2013/9/14/entrez PY - 2013/9/14/pubmed PY - 2014/7/23/medline KW - Aggregation KW - Disaggregation KW - Suwannee River humic acid KW - Zeta potential KW - ZnO nanoparticles SP - 195 EP - 201 JF - The Science of the total environment JO - Sci. Total Environ. VL - 468-469 N2 - The surface charge and average size of manufactured ZnO nanoparticles (NPs) were studied as a function of pH to understand the aggregation behavior and importance of the electrostatic interactions in solution. The interactions between ZnO and Suwannee River humic acid (SRHA) were then investigated under a range of environmentally relevant conditions with the ZnO nanoparticles pHPZC as the point of reference. The anionic charges carried by aquatic humic substances were found to play a major role in the aggregation and disaggregation of ZnO nanoparticles. At low concentrations of SRHA (<0.05 mg/L) and below the pHPZC, anionic SRHA was rapidly adsorbed onto the positively charged ZnO NPs hence promoting aggregation. With similar SHRA concentrations, at pHPZC, SRHA was able to control the suspension behavior of the ZnO and promote partial disaggregation in small volumes. This was more distinguishable when the pH was greater than pHPZC as SRHA formed a surface coating on the ZnO nanoparticles and enhanced stability via electrostatic and steric interactions. In most cases, the NP coating by SRHA induced disaggregation behavior in the ZnO nanoparticles and decreased the aggregate size in parallel to increasing SRHA concentrations. Results also suggest that environmental aquatic concentration ranges of humic acids largely modify the stability of aggregated or dispersed ZnO nanoparticles. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/24029691/Aggregation_and_disaggregation_of_ZnO_nanoparticles:_influence_of_pH_and_adsorption_of_Suwannee_River_humic_acid_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(13)00958-3 DB - PRIME DP - Unbound Medicine ER -