Sponsor(s): Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences(CAS)
12 issues per year
Current Issue: Issue 05, 2020
Environmental Science is supervised by Chinese Academy of Sciences and sponsored by Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (CAS). Launched in 1976, it is a monthly and international public journal. Its scope covers the latest and significant achievements in basic research and applied research, and the theories and techniques for pollution control, clean production and ecological construction. The journal is included in MEDLINE, CA, AJ, BP, IM, JICST, ZR, CSA, CSTPCD, CNKI and CSCD.
Zhao Jingzhu, Hao Jiming, Tian Gang
Environmental Science,2020,Vol 41,No. 05
Agglomeration and dispersion of nanoparticles control many important environmental processes. In this study, the particle size and zeta potential of ferrihydrite nanoparticles (FHNPs) and goethite nanoparticles (GTNPs) under different pH, ion, and organic matter conditions were measured. These data were used to calculate the Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy between nanoparticles to further investigate the stability of two nanoparticles. The results showed that Na + and Ca 2+ promoted FHNPs and GTNPs agglomeration due to their ionic strength. The PO 43- with low concentration (2 mmol·L −1), humic acid, and fulvic acid (2 mg·L −1 and 10 mg·L −1) loaded on iron mineral nanoparticles changed their surface charge and further improved the stability of FHNPs and GTNPs at medium and high pH. Although the PO 43- with high concentration (10 mmol·L −1) also changed the electrical properties of iron mineral nanoparticles, it had little contribution to the GTNP stability due to its ionic strength. When the zeta potentials of FHNPs or GTNPs were close to 0, the primary barrier and secondary minima were nonexistent simultaneously. The two kinds of nanoparticles irreversibly agglomerated in primary minima. When the primary barrier and secondary minima coexisted, the proportion of reversible aggregation of FHNPs and GTNPs in secondary minima increased. The results provided support for further investigation of the environmental behavior of FHNPs and GTNPs, and iron mineral nanoparticle-facilitated transport of pollutants.