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Author Luo, Chang ♦ Xie, Yawei ♦ Li, Fang ♦ Jiang, Tao ♦ Wang, Qiang ♦ Jiang, Zhenmao ♦ Wei, Shiqiang
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Agronomy
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Technology ♦ Medicine & health ♦ Diseases ♦ Agriculture & related technologies ♦ Techniques, equipment & materials
Subject Keyword Discipline Environmental Health
Abstract Humic acid (HA) and iron oxides (FeOs) commonly coexist, and their interactions alter their ability to adsorb pollutants in the environment. The influences of HA on arsenate [As(V)] adsorption on FeOs were investigated on the preformation of complexes and their coexistence with As(V) in solution. The results indicated that HA could be strongly adsorbed on FeOs, and the adsorption capacity (, mg g HA-C) followed the sequence goethite (7.73) > ferrihydrite (3.14) > hematite (2.25) with a desorption rate <1%. The HA adsorbed existed uniformly on the FeOs surfaces in spot form and did not change the x-ray diffraction (XRD) patterns of FeOs. The formation of FeOs-HA complexes altered As(V) adsorption with a reduced adsorption capacity, prolonged reaction kinetics, and enhanced adsorption strength. The As(V) adsorption on both FeOs and FeOs-HA complexes decreased with increasing pH (2.5-9) or decreasing ionic strength (0.2-0 M). The coexistence of HA in solution linearly decreased the As(V) adsorption on FeOs. Thus, our results demonstrated two impact pathways of HA on As(V) adsorption on FeOs: (i) blockage or occupation in the surface sites of FeOs if HA preformed complexes with FeOs and (ii) a competition to the surface sites of FeOs when HA coexisted with As(V) in the solution.
ISSN 00472425
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2015-11-01
Publisher Place United States
e-ISSN 15372537
Journal Journal of Environment Quality
Volume Number 44
Issue Number 6

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Source: WHO-Global Index Medicus