Arsenic removal from water by photocatalytic functional Fe2O3–TiO2 porous ceramic

Su, Huanhuan; Lv, Xiang; Zhang, Zhengyi; Yu, Jiajie; Wang, Tianhe

doi:10.1007/s10934-017-0362-9

Cited by 30 publications

(23 citation statements)

References 32 publications

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“…The increase in arsenic exposure to human population has been observed when people started using underground water in preference to surface water contaminated with micro-organisms [1]. Contamination of arsenic in groundwater has become a global issue and has brought serious health problems such as skin cancers, bladder diseases and kidney failure in human [26]. Millions of people from India, China, Bangladesh, Pakistan, Australia and South America are exposed to arsenic by consuming drinking water where its concentration exceeded the maximum permissible limit (10 μg/L) [5,23,26].…”

Section: Introductionmentioning

confidence: 99%

“…Contamination of arsenic in groundwater has become a global issue and has brought serious health problems such as skin cancers, bladder diseases and kidney failure in human [26]. Millions of people from India, China, Bangladesh, Pakistan, Australia and South America are exposed to arsenic by consuming drinking water where its concentration exceeded the maximum permissible limit (10 μg/L) [5,23,26]. Arsenic is classified as a Class I human carcinogen by the International Agency for Research on Cancer (IARC) due to its association with many adverse human effects [3].…”

Section: Introductionmentioning

confidence: 99%

“…The toxicity of As(III) is reported about 25-60 times higher than that of As(V) [13]. Meanwhile, As(III) show a low adsorption performance to various adsorbents compared to As(V) [26]. Generally, As(III) exists in anaerobic waters while As(V) present in aerobic waters [8,25].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, pretreatment such as oxidation of As(III) to the less toxic As(V) are usually required for the adsorption removal processes. Different oxidants such as O 3 , H 2 O 2 , MnO 2 , chlorine, chlorine dioxide, dichloroamine (NHCl 2 ), and ferrate (FeO 4 2− ) were previously used for the oxidation of As(III) to As(V) [8,26]. Unfortunately, conventional oxidants, especially chlorine, chlorine dioxide and ozone resulting in various drawbacks including limited removal efficiency, expensive reagents and dangerous oxidation by-products [20].…”

Section: Introductionmentioning

confidence: 99%

“…Heterogeneous photocatalysis, using TiO 2 NPs has been used as an alternative for the adsorption of arsenic from drinking water [8]. Previously reported study indicated that modified TiO 2 NPs not only adsorb both the species but also photo-oxidizes As(III) species to As(V) followed by adsorption [2,8,26]. Titania nano-catalyst showed greater affinity towards the adsorption of As(III).…”

Section: Introductionmentioning

confidence: 99%

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Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Saqib

Khan²,

Alam³

et al. 2020

SN Appl. Sci.

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Visible light driven metals (Gd and Tl) doped TiO 2 nanoparticles (NPs) were prepared using low cost and facile liquid impregnation method. The prepared NPs were characterized using XRD, SEM/EDX, BET surface area analysis, particle size distribution analyzer, UV-Vis DRS and pH of point of zero charge (pH PZC) analyses. The crystalline phases observed were purely anatase with the particles size ranged between 24 and 30 nm possessing large surface area (74 m 2 /g) and pore size (12 nm). The reductions in the band gap energy for both the dopant systems were observed and absorption edges were extended to the visible region. The prepared NPs exhibited good photo-induced adsorption affinity for the As(III) from aqueous solution under natural pH of As(III) solution, ambient temperature and normal household compact fluorescent light. The metals-doped NPs showed high removal efficiency (up to 99%) towards As(III) compared to pure TiO 2 NPs (68%). In addition, the glass beads immobilized photocatalyst not only enhanced the efficiencies by increasing the active surface area of NPs, but also overcome the post-reaction separation steps. The regeneration study indicated that the physical regeneration is more significant for the reutilization of photocatalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Saqib

Khan²,

Alam³

et al. 2020

SN Appl. Sci.

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Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂/Fe₂O₃

Bullen

Heiba

Kafizas

et al. 2022

Chemistry A European J

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Composite photocatalyst-adsorbents such as TiO 2 / Fe 2 O 3 are promising materials for the one-step treatment of arsenite contaminated water. However, no previous study has investigated how coupling TiO 2 with Fe 2 O 3 influences the photocatalytic oxidation of arsenic(III). Herein, we develop new hybrid experiment/modelling approaches to study light absorption, charge carrier behaviour and changes in the rate law of the TiO 2 /Fe 2 O 3 system, using UV-Vis spectroscopy, transient absorption spectroscopy (TAS), and kinetic analysis. Whilst coupling TiO 2 with Fe 2 O 3 improves total arsenic removal by adsorption, oxidation rates significantly decrease (up to a factor of 60), primarily due to the parasitic absorption of light by Fe 2 O 3 (88 % of photons at 368 nm) and secondly due to changes in the rate law from disguised zero-order kinetics to first-order kinetics. Charge transfer across this TiO 2 -Fe 2 O 3 heterojunction is not observed. Our study demonstrates the first application of a multi-adsorbate surface complexation model (SCM) towards describing As(III) oxidation kinetics which, unlike Langmuir-Hinshelwood kinetics, includes the competitive adsorption of As(V). We further highlight the importance of parasitic light absorption and catalyst fouling when designing heterogeneous photocatalysts for As(III) remediation.

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Sequential uptake of cadmium and methylene blue from binary solution using zeolite‐TiO₂ modified porous CaCu₃Ti₄O₁₂ photocatalyst

Saqib

Adnan

Shah

et al. 2021

Env Prog and Sustain Energy

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This work describes the synthesis of CaCu 3 Ti 4 O 12 (CCTO) by a facile conventional oxide mixing method. The prepared CCTO particles were further modified with anatase TiO 2 NPs (~55 nm size) and zeolite supported TiO 2 nanoparticles (NPs) (~58 nm size) for the photocatalytic removal of MB and Cd 2+ from the aqueous media under compact fluorescent light. Both nascent and modified CCTO composite materials were characterized using X-ray diffraction, scanning electron micrograph /energy dispersion X-ray, BET, UV-VIS-DRS, and pH of the point of zero charge analyses. These composite materials revealed with remarkable affinity toward MB and Cd 2+ , whereby the maximum photocatalytic degradation and adsorption capacity reached to 73 and 77 mg/g, respectively. The cations removal efficiencies of the prepared composite materials were found increased in the binary solutions of MB and Cd 2+ ions resulting in enhanced degradation and adsorption capacity, q e , up to 132, and 137 mg/g, respectively. The reusability tests revealed that the efficiencies of prepared composites gradually decreased upon reuse.

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Arsenic removal from water by photocatalytic functional Fe2O3–TiO2 porous ceramic

Cited by 30 publications

References 32 publications

Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂/Fe₂O₃

Sequential uptake of cadmium and methylene blue from binary solution using zeolite‐TiO₂ modified porous CaCu₃Ti₄O₁₂ photocatalyst

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Arsenic removal from water by photocatalytic functional Fe2O3–TiO2 porous ceramic

Cited by 30 publications

References 32 publications

Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO2/Fe2O3

Sequential uptake of cadmium and methylene blue from binary solution using zeolite‐TiO2 modified porous CaCu3Ti4O12 photocatalyst

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Product

Resources

About

Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂/Fe₂O₃

Sequential uptake of cadmium and methylene blue from binary solution using zeolite‐TiO₂ modified porous CaCu₃Ti₄O₁₂ photocatalyst