Photocatalysis for arsenic removal from water: considerations for solar photocatalytic reactors

Silerio-Vázquez, Felipe de J.; Proal-Nájera, José B.; Bundschuh, Jochen; Alarcón-Herrera, María Teresa

doi:10.1007/s11356-021-16507-5

Cited by 12 publications

(3 citation statements)

References 130 publications

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“…V and Se) through photocatalytic reduction 46,47 or oxidative pretreatment of As. 48 While these elements were present in OSPW at trace levels close to the lower detection limits, these results demonstrate the potential of photocatalysis to simultaneously treat trace metals during OSPW detoxification.…”

Section: Additional Trace Elements Removed Via Photocatalysismentioning

confidence: 73%

Photocatalytic treatment of diverse contaminants of potential concern in oil sands process-affected water

Martin,

Leshuk,

Armstrong

et al. 2024

Preprint

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Oil sands process-affected water (OSPW), generated by surface mining in Canada’s oil sands, require treatment of environmentally persistent dissolved organic compounds before release to the watershed. Conventional chemical and mechanical treatments have not proved suitable for treating the large quantities of stored OSPW, and the biological recalcitrance of some dissolved organics may not be adequately addressed by conventional passive treatment systems. Previous work has evaluated photocatalytic treatment as a passive advanced oxidation process (P-AOP) for OSPW remediation. This work expands upon this prior research to further characterize the effects of water chemistry on the treatment rate and detoxification threshold. Under artificial sunlight, buoyant photocatalysts (BPCs) detoxified all OSPW samples within 1 week of treatment time with simultaneous treatment of polycyclic aromatic hydrocarbons, naphthenic acid fraction components (NAFCs), and un-ionized ammonia. Overall, these results further demonstrate passive photocatalysis as an effective method for treatment of OSPW contaminants of potential concern (COPCs).

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Section: Additional Trace Elements Removed Via Photocatalysismentioning

confidence: 73%

Photocatalytic treatment of diverse contaminants of potential concern in oil sands process-affected water

Martin,

Leshuk,

Armstrong

et al. 2024

Preprint

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“…The highest oxidation was achieved in this round of experiments, which conjoins the effects of the previous treatments. The main ROS driving As III oxidation has been debated [72], but for cases in which In Figure 7, As III oxidation via HP+ H 2 O 2 is shown. The highest oxidation was achieved in this round of experiments, which conjoins the effects of the previous treatments.…”

Section: Arsenic Oxidationmentioning

confidence: 99%

“…The highest oxidation was achieved in this round of experiments, which conjoins the effects of the previous treatments. The main ROS driving As III oxidation has been debated [72], but for cases in which H 2 O 2 is added, it has been recently proposed that a nonradical species, surface complexes Ti-peroxo (Ti-OOH), would be the main oxidative species [73,74]. This fact can be theorized as an As III oxidation experiment using cerium dioxide (CeO 2 ), with cerium being in the same periodic group as titanium, found in the presence of Ce-peroxo surface complexes [75].…”

Section: Arsenic Oxidationmentioning

confidence: 99%

Arsenite to Arsenate Oxidation and Water Disinfection via Solar Heterogeneous Photocatalysis: A Kinetic and Statistical Approach

Silerio-Vázquez

Núñez-Núñez

Proal-Nájera

et al. 2022

Water

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Arsenic (As) poses a threat to human health. In 2014, more than 200 million people faced arsenic exposure through drinking water, as estimated by the World Health Organization. Additionally, it is estimated that drinking water with proper microbiological quality is unavailable for more than 1 billion people. The present work analyzed a solar heterogeneous photocatalytic (HP) process for arsenite (AsIII) oxidation and coliform disinfection from a real groundwater matrix employing two reactors, a flat plate reactor (FPR) and a compound parabolic collector (CPC), with and without added hydrogen peroxide (H2O2). The pseudo first-order reaction model fitted well to the As oxidation data. The treatments FPR–HP + H2O2 and CPC–HP + H2O2 yielded the best oxidation rates, which were over 90%. These treatments also exhibited the highest reaction rate constants, 6.7 × 10−3 min−1 and 6.8 × 10−3 min−1, respectively. The arsenic removal rates via chemical precipitation reached 98.6% and 98.7% for these treatments. Additionally, no coliforms were detected at the end of the process. The collector area per order (ACO) for HP treatments was on average 75% more efficient than photooxidation (PO) treatments. The effects of the process independent variables, H2O2 addition, and light irradiation were statistically significant for the AsIII oxidation reaction rate (p < 0.05).

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A review on photocatalytic degradation of aromatic organoarsenic compounds in aqueous environment using nanomaterials

Emmanuel,

Adesibikan

2024

J Chinese Chemical Soc

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Aromatic organoarsenic compounds (AOCs) have proven to be both a boon and a curse by boosting profit maximization in livestock production and at the same time contributing to the pollution of water bodies, the chief cornerstone of the ecosystem. Interestingly, photocatalytic degradation using nanomaterials has emerged as an effective method to mitigate AOC pollution. Thus, this study aims to review and analyze original research works directed toward the photocatalytic degradation of AOC in the aqueous environment. In this study, the photocatalytic degradation efficiency of various nanomaterials is investigated for different aromatic organoarsenic compounds. In addition, an empirical analysis was conducted on the impact of electron trapping and radical scavengers. Furthermore, photocatalytic degradation kinetics and mechanisms were pragmatically discussed. Also, recyclability, stability, and real‐life applicability were empirically evaluated. According to this review, most nanomaterial materials had maximal photocatalytic degradation efficiencies of >75% for most AOCs within an average time of 6–330 min. The radical scavenging study revealed that ●OH and O2● mechanistically play a major role in AOC degradation than electrons and holes. Additionally, it was shown that expended photocatalysts can be eluted mostly with H2O/NaOH and recycled up to 3–6 rounds with a degradation efficiency of >80% in most cases while maintaining their original structural integrity. This indicates that the method has the potential to be both environmentally friendly and industrially scalable. Ultimately, research gaps were highlighted, which can help researchers identify future research hotspots and open doors for technique advancement.

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Photocatalysis for arsenic removal from water: considerations for solar photocatalytic reactors

Cited by 12 publications

References 130 publications

Photocatalytic treatment of diverse contaminants of potential concern in oil sands process-affected water

Photocatalytic treatment of diverse contaminants of potential concern in oil sands process-affected water

Arsenite to Arsenate Oxidation and Water Disinfection via Solar Heterogeneous Photocatalysis: A Kinetic and Statistical Approach

A review on photocatalytic degradation of aromatic organoarsenic compounds in aqueous environment using nanomaterials

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