Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study

Hu, Shan; Yan, Wei; Duan, Jinming

doi:10.1016/j.colsurfa.2015.01.021

Cited by 21 publications

(24 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of three ν3 bands indicated the C2ν or lower symmetry for the IS arsenate complexes. The above characteristic bands are consistent with the observations of arsenate adsorption on ferrihydrite, hematite and rutile (Brechbuhl et al, 2012;Hu et al, 2015). Gao et al…”

Section: Individual Molecular Adsorptionsupporting

confidence: 89%

See 1 more Smart Citation

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Liang

Lin

Wei

et al. 2021

American Mineralogist

View full text Add to dashboard Cite

show abstract

Section: Individual Molecular Adsorptionsupporting

confidence: 89%

“…were assigned to the asymmetric and symmetric stretchings (ν3) of As-OFe, respectively (Brechbuhl et al, 2012;Hu et al, 2015). The presence of three ν3 bands indicated the C2ν or lower symmetry for the IS arsenate complexes.…”

Section: Individual Molecular Adsorptionmentioning

confidence: 99%

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Liang

Lin

Wei

et al. 2021

American Mineralogist

View full text Add to dashboard Cite

show abstract

“…The desorption rates were 86.8%-88.6% for Ca 2+ and 45.9%-48.2% for Si(OH) 4 . The low Si(OH) 4 desorption rate can be ascribed to the polymerization of Si(OH) 4 on the TiO 2 surface during the long-term filtration cycle (Hu et al, 2015c). With the formation of Si(OH) 4 polymers and because of their low desorption rates, decreased As adsorption capacities in the regenerated TiO 2 column were observed, even though the As regeneration rate was extremely high (98.7%-99.5%) (Hu et al, 2015a).…”

Section: Regeneration and Reuse Of Tiomentioning

confidence: 99%

“…For TiO 2 that adsorbs groundwater containing As and coexisting Si, the formation of Si polymers can occupy the surface sites and consequently inhibit As adsorption and TiO 2 regeneration (Christl et al, 2012;Hu et al, 2015c). Hu et al (2015a) studied granular TiO 2 regeneration using NaOH and HCl after adsorbing real groundwater containing the following analytes of interest at pH 8.2: 454 μg/L As(III), 88 μg/L As(V), 35.3 mg/L Ca, and 5.10 mg/L Si.…”

Section: Regeneration and Reuse Of Tiomentioning

confidence: 99%

Recent progress of arsenic adsorption on TiO 2 in the presence of coexisting ions: A review

Jing

2016

Journal of Environmental Sciences

Self Cite

View full text Add to dashboard Cite

“…30−32 The amount of Si(OH) 4 surface oligomer and polymer may increase with time and, even worse, may not be desorbed by As(V). 32 As shown in our following TiO 2 regeneration results, low Si(OH) 4 desorption, due to Si(OH) 4 polymerization, may contribute to the decreased As adsorption capacity in the regenerated TiO 2 column.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Groundwater Arsenic Adsorption on Granular TiO₂: Integrating Atomic Structure, Filtration, and Health Impact

Shi

Jing

2015

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

A pressing challenge in arsenic (As) adsorptive filtration is to decipher how the As atomic surface structure obtained in the laboratory can be used to accurately predict the field filtration cycle. The motivation of this study was therefore to integrate molecular level As adsorption mechanisms and capacities to predict effluent As from granular TiO 2 columns in the field as well as its health impacts. Approximately 2,955 bed volumes of groundwater with an average of 542 μg/L As were filtered before the effluent As concentration exceeded 10 μg/L, corresponding to an adsorption capacity of 1.53 mg As/g TiO 2 .After regeneration, the TiO 2 column could treat 2,563 bed volumes of groundwater, resulting in an As load of 1.36 mg/g TiO 2 . Column filtration and EXAFS results showed that among coexisting ions present in groundwater, only Ca 2+ , Si(OH) 4 , and HCO 3 − would interfere with As adsorption. The compound effects of coexisting ions and molecular level structural information were incorporated in the PHREEQC program to satisfactorily predict the As breakthrough curves. The total urinary As concentration from four volunteers of local residences, ranging from 972 to 2,080 μg/L before groundwater treatment, decreased to the range 31.7−73.3 μg/L at the end of the experimental cycle (15− 33 days). ■ INTRODUCTIONAdsorptive filtration is one of the most cost-effective and userfriendly techniques to provide arsenic (As) safe drinking water in geogenic As contaminated areas.1,2 Integration of mounting molecular-level evidence over the past decade has shown that the mechanism of As adsorption mainly involves the formation of bidentate binuclear inner sphere surface complexes. 3−5Although substantial progress has improved our understanding of batch and field filtration experiments, a pressing challenge is to decipher how the molecular-level mechanism obtained in the laboratory can be used to accurately predict the field filtration cycle.Rethinking the failure in prediction of field filtration breakthrough curves using parameters obtained with batch experiments, we realized that the adsorption kinetics might not be the critical contributor, as initially thought. The difference in reaction kinetics between batch complete-mixed and column flow-through conditions has long been recognized and solved by incorporating a nonequilibrium kinetics block in simulation code such as PHREEQC. 6,7 On the other hand, even without the kinetics block, the adsorptive filtration of As(III) in synthetic water matrices through iron-oxide-coated rock can be successfully modeled. 8 This success may be attributed to instantaneous uptake of As by most metal oxides. However, a real difficulty surfaces when predicting the groundwater As breakthrough curves in field columns, even with the kinetics block and additional As adsorption reactions. 8,9 The compound effects of groundwater matrices on As adsorption cannot be overstated.Groundwater As adsorption on metal oxides can be suppressed or enhanced in the presence of coexisting ions. Previo...

show abstract

Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study

Cited by 21 publications

References 36 publications

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Recent progress of arsenic adsorption on TiO 2 in the presence of coexisting ions: A review

Groundwater Arsenic Adsorption on Granular TiO₂: Integrating Atomic Structure, Filtration, and Health Impact

Contact Info

Product

Resources

About

Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study

Cited by 21 publications

References 36 publications

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Recent progress of arsenic adsorption on TiO 2 in the presence of coexisting ions: A review

Groundwater Arsenic Adsorption on Granular TiO2: Integrating Atomic Structure, Filtration, and Health Impact

Contact Info

Product

Resources

About

Groundwater Arsenic Adsorption on Granular TiO₂: Integrating Atomic Structure, Filtration, and Health Impact