TY - JOUR
T1 - Hausmannite as potential As(V) filter. Macroscopic and spectroscopic study of As(V) adsorption and desorption by citric acid
AU - Barreto, Matheus Sampaio C.
AU - Elzinga, Evert J.
AU - Alleoni, Luís Reynaldo F.
N1 - Funding Information:
The first author gratefully thanks the São Paulo Research Foundation ( FAPESP ) (grants #2016/05870-1 , #2016/22058-9 ) for the scholarship granted for this research. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil ( CAPES ) - Finance Code 001 , and by the Conselho Nacional de Ciência e Tecnologia - Brasil ( CNPq ).
Funding Information:
The first author gratefully thanks the S?o Paulo Research Foundation (FAPESP) (grants #2016/05870-1, #2016/22058-9) for the scholarship granted for this research. This study was financed in part by the Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - Brasil (CAPES) - Finance Code 001, and by the Conselho Nacional de Ci?ncia e Tecnologia - Brasil (CNPq).
PY - 2020/7
Y1 - 2020/7
N2 - Arsenic (As) is a toxic element that leads the list of human health threats and is one of the priority contaminants in soil and water. In order to remove As(V) and/or reduce its mobility, filters and amendments with high affinity for As(V) adsorption are used in drinking water treatment or directly applied to the soil, thereby promoting its immobilization. Hausmannite and hematite were compared by in-situ Attenuated Total Reflection - Fourier Transform Infrared (ATR-FTIR) spectroscopy and batch experiments for evaluating As(V) adsorption and sequential desorption by citrate. The pH and contact time were used as variables. Hausmanite adsorbed more As(V) than hematite. As(V) was adsorbed on the mineral surface of simultaneously inner- and outer-sphere species. Inner-sphere bidentate complex form preferentially at high pH, early adsorption time and low surface loading, while the monodentate species should be responsible to increase total As(V) adsorption at low pH, later adsorption kinetics and higher As(V) surface loading. Citrate was effective in causing As(V) desorption at higher citric acid concentrations and higher pH values. After a long time of incubation, the neogenesis of a manganite by hausmnannite oxidation was observed. Concomitantly, less As(V) was desorbed by citrate desorption, even in the presence of high citric acid concentrations. Hausmannite was an efficient mineral for As(V) removal and immobilization.
AB - Arsenic (As) is a toxic element that leads the list of human health threats and is one of the priority contaminants in soil and water. In order to remove As(V) and/or reduce its mobility, filters and amendments with high affinity for As(V) adsorption are used in drinking water treatment or directly applied to the soil, thereby promoting its immobilization. Hausmannite and hematite were compared by in-situ Attenuated Total Reflection - Fourier Transform Infrared (ATR-FTIR) spectroscopy and batch experiments for evaluating As(V) adsorption and sequential desorption by citrate. The pH and contact time were used as variables. Hausmanite adsorbed more As(V) than hematite. As(V) was adsorbed on the mineral surface of simultaneously inner- and outer-sphere species. Inner-sphere bidentate complex form preferentially at high pH, early adsorption time and low surface loading, while the monodentate species should be responsible to increase total As(V) adsorption at low pH, later adsorption kinetics and higher As(V) surface loading. Citrate was effective in causing As(V) desorption at higher citric acid concentrations and higher pH values. After a long time of incubation, the neogenesis of a manganite by hausmnannite oxidation was observed. Concomitantly, less As(V) was desorbed by citrate desorption, even in the presence of high citric acid concentrations. Hausmannite was an efficient mineral for As(V) removal and immobilization.
KW - Adsorption
KW - Anion competition
KW - Colloidal surface
KW - In-situ infrared spectroscopy
KW - Iron-oxide
KW - Soil and water contamination
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U2 - 10.1016/j.envpol.2020.114196
DO - 10.1016/j.envpol.2020.114196
M3 - Article
C2 - 32163805
AN - SCOPUS:85081261254
SN - 0269-7491
VL - 262
JO - Environmental Pollution
JF - Environmental Pollution
M1 - 114196
ER -