Competitive adsorption of arsenic and fluoride on {2 0 1} TiO2

Zhou, Zhen; Yu, Yaqin; Ding, Zhaoxia; Zuo, Meimei; Jing, Chuanyong

doi:10.1016/j.apsusc.2018.10.052

Cited by 33 publications

(7 citation statements)

References 52 publications

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“…The O 1s spectrum was divided into two peaks positioned at 530.1 and 531.7 eV, corresponding to metal oxide (M–O) and hydroxyl-bonded to metal (M–OH) (Figure S18). After the adsorption of U(VI), the binding energies of M–OH peaks both exhibited a blue shift, and the area ratio of M–OH peaks decreased from 18.7 to 13.0% in the A-TNTAs/Ti mesh electrode and from 16.4 to 13.2% in the R-TNTAs/Ti mesh electrode. , These results indicated that the Ti–OH groups on the A-TNTAs/Ti mesh and R-TNTAs/Ti mesh electrodes were the active sites for U(VI) adsorption, which can form stable surface complexes with U(VI). , Generally, adsorption performance depends on available adsorption sites and specific surface area . However, the hydroxyl density and the specific surface area of TiO 2 tend to decrease with the increase of the temperature of the annealing treatment. − The specific surface area of the A-TNTAs/Ti mesh electrode was 499.96 m 2 /m 2 electrode area, which was almost 3 times that of the R-TNTAs/Ti mesh electrode (177.89 m 2 /m 2 ) (Figure S19).…”

Section: Resultsmentioning

confidence: 83%

“…24 The O 1s spectrum was divided into two peaks positioned at 530.1 and 531.7 eV, corresponding to metal oxide (M−O) and hydroxyl-bonded to metal (M−OH) (Figure S18). 27 After the adsorption of U(VI), the binding energies of M−OH peaks both exhibited a blue shift, and the area ratio of M−OH peaks decreased from 18.7 to 13.0% in the A-TNTAs/Ti mesh electrode and from 16.4 to 13.2% in the R-TNTAs/Ti mesh electrode. 28,29 These results indicated that the Ti−OH groups on the A-TNTAs/Ti mesh and R-TNTAs/Ti mesh electrodes were the active sites for U(VI) adsorption, which can form stable surface complexes with U(VI).…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Lin

Liu

Qie

et al. 2022

Environ. Sci. Technol.

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Groundwater containing naturally occurring uranium is a conventional drinking water source in many countries. Removal of low concentrations of uranium complexes in groundwater is a challenging task. Here, we demonstrated that the TiO2 nanotube arrays/Ti (TNTAs/Ti) mesh electrode could break through the concentration limit and efficiently remove low concentrations of uranium complexes from both simulated and real groundwater. U(VI) complexes in groundwater were electro-reduced to UO2 and deposited on the TNTAs/Ti mesh electrode surface. The adsorption rate and electron transfer rate of the anatase TNTAs/Ti mesh electrode were twice that of the rutile TNTAs/Ti mesh electrode. Therefore, the anatase TNTAs/Ti mesh electrode exhibited excellent electrocatalytic activity toward the electrochemical removal of U(VI), which could work at a higher potential and significantly reduce the energy consumption of U(VI) removal. The U(VI) adsorption capacity on the anatase TNTAs/Ti mesh electrode was limited due to the low U(VI) concentration. However, the anatase TNTAs/Ti mesh electrode displayed a huge U(VI) removal capacity using the electroreduction method, where adsorption and reduction of U(VI) were mutually promoted and induced continuous accumulation of UO2 on the electrode. The accumulated UO2 can be easily recovered in dilute HNO3, and the electrode can be used repeatedly.

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Section: Resultsmentioning

confidence: 83%

Section: ■ Results and Discussionmentioning

confidence: 94%

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Lin

Liu

Qie

et al. 2022

Environ. Sci. Technol.

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“…The modification of nano TiO 2 can effectively improve its adsorption efficiency for more kinds of materials through the interface assembly of organic components. (Dong et al, 2017;Huang et al, 2019;Zhou et al, 2019;Qiang et al, 2020;Roy, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effective adsorption of heavy metal ions in water by sulfhydryl modified nano titanium dioxide

Chen

Li²,

Liu³

et al. 2023

Front. Chem.

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Background: The monitoring and removal of heavy metal ions in wastewater will effectively improve the quality of water and promote the green and sustainable development of ecological environment. Using more efficient adsorption materials and more accurate detection means to treat heavy metal ions in water has always been a research focus and target of researchers.Method: A novel titania nanomaterial was modified with sulfhydryl group (nano TiO2-SH) for detection and adsorption of heavy metal ions in water, and accurately characterize the adsorption process using Surface-Enhanced Raman Spectroscopy (SERS) and other effective testing methods.Results: The maximum adsorption efficiency of nano TiO2-SH for the Hg2+, Cd2+, Pb2+ three heavy metal ions reached 98.3%, 98.4% and 98.4% respectively. And more importantly, after five cycles of adsorption and desorption, the adsorption efficiency of nano TiO2-SH for these three metal ions is still above 96%.Conclusion: These results proved the nano TiO2-SH adsorbent has great potential in practical water pollution purification.

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“…Water is an important pathway for the production and release of toxic effects of arsenic, and Podgorski et al estimate that 94–220 million people worldwide may be exposed to groundwater containing high concentrations of arsenic. Adsorption is the most commonly used procedure for arsenic removal, and a variety of adsorbents have been studied for arsenic removal, including zirconium oxide, aluminum oxide, titanium oxide, biochar, chitosan, and other materials. However, these adsorbents still have problems such as slow adsorption rate, low adsorption capacity, and low selectivity .…”

Section: Introductionmentioning

confidence: 99%

Surface Properties and Microstructures of Al-SBA-15 under Different Temperature Calcinations in Relation to Adsorption Performance

Liu

et al. 2023

J. Phys. Chem. C

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In this study, the calcination temperature was adjusted to influence the properties, including surface alumina types, microstructure, and surface acidity, and then to explore their association with the performance of As(V) adsorption after preparing aluminum-modified SBA-15 (Al-SBA-15 x ) by the incipient wetness impregnation method. The results showed that calcination promoted the formation of aluminum oxides with different coordination environments on SBA-15 carriers, resulting in different kinds of acid sites and Al−OH groups, which were the adsorption sites for As(V). However, with the increase in the calcination temperature, the total surface acidity on the Al-SBA-15 x samples gradually decreased, and the dehydration and dehydroxylation reactions of aluminum oxides occurred, which reduced the Al−OH groups and changed the acid−base environment on the samples. Besides, high-temperature calcination caused a partial collapse of mesoporous channels, which was not conducive to dispersing the active adsorption centers on the surface and further reduced the effective utilization of active adsorption centers. Therefore, the adsorption capacity of an Al-SBA-15 x adsorbent for As(V) decreased with the increase of the calcination temperature. Furthermore, kinetic models were used to investigate the relationship between the microstructure and adsorption processes. Finally, recycling tests were performed to demonstrate the reusability of Al-SBA-15 x samples.

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Competitive adsorption of arsenic and fluoride on {2 0 1} TiO2

Cited by 33 publications

References 52 publications

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Effective adsorption of heavy metal ions in water by sulfhydryl modified nano titanium dioxide

Surface Properties and Microstructures of Al-SBA-15 under Different Temperature Calcinations in Relation to Adsorption Performance

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Competitive adsorption of arsenic and fluoride on {2 0 1} TiO2

Cited by 33 publications

References 52 publications

Electrocatalytic Removal of Low-Concentration Uranium Using TiO2 Nanotube Arrays/Ti Mesh Electrodes

Electrocatalytic Removal of Low-Concentration Uranium Using TiO2 Nanotube Arrays/Ti Mesh Electrodes

Effective adsorption of heavy metal ions in water by sulfhydryl modified nano titanium dioxide

Surface Properties and Microstructures of Al-SBA-15 under Different Temperature Calcinations in Relation to Adsorption Performance

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Product

Resources

About

Competitive adsorption of arsenic and fluoride on {2 0 1} TiO2

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes

Electrocatalytic Removal of Low-Concentration Uranium Using TiO₂ Nanotube Arrays/Ti Mesh Electrodes