Interpreting competitive adsorption of arsenate and phosphate on nanosized iron (hydr)oxides: effects of pH and surface loading Research Article First Online: 08 August 2018 Received: 09 May 2018 Accepted: 02 August 2018 Abstract
Arsenate and phosphate have similar properties due to their electrochemical structures, but their environmental impacts are unique. The abundance and competition of arsenate and phosphate determine their bioavailability and leachability; thus, it is essential to understand their fate in the soil environment. In this study, the effects of pH and surface loading on the competitive adsorption of arsenate and phosphate on four iron (hydr)oxides were evaluated by employing the Langmuir isotherm, competitive sorption ratio (
CSR), and competition effect ( CE). The stability and transformation of the iron (hydr)oxides were also assessed. Various adsorption patterns were observed in the single and mixed treatments by controlling the addition of oxyanions, pH, surface loading, and type of iron (hydr)oxides. Arsenate was preferentially adsorbed at a low pH, whereas phosphate showed the opposite trend. The CE was close to zero at low surface density (no competition) and sequentially changed to negative or positive values with increasing surface density, indirectly indicating the sequential development of promotive and competitive effects. Transformation in goethite was identified at a high pH with the presence of oxyanions, except that no transformation was observed upon the addition of oxyanions and with pH change. However, the stability of the iron (hydr)oxides decreased at a low pH and with the presence of phosphate, arsenate, or both. The hematite showed a significant promotive effect regardless of the pH. Our study revealed that the pH, surface loading, and type of iron (hydr)oxides are intercorrelated and simultaneously affect the adsorption characteristics of oxyanions and the stability of iron (hydr)oxides. As(V),P(V) Keywords Iron (hydr)oxide Arsenate Phosphate Langmuir isotherm Competitive sorption ratio Competitive effect
Responsible editor: Tito Roberto Cadaval Jr
Electronic supplementary material
The online version of this article (
) contains supplementary material, which is available to authorized users. https://doi.org/10.1007/s11356-018-2897-y Notes Funding information
This research was supported by the Basic Science Research Program (NRF-2014R1A1A2059196) and Global Ph.D. Fellowship Program (NRF-2015H1A2A1034068) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education of the Republic of Korea and by the Brain Korea 21 Plus Program funded by the Ministry of Education of the Republic of Korea.
Compliance with ethical standards Conflict of interest
The authors declare that they have no conflicts of interest.
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