Efficient arsenic removal by a bifunctional heterogeneous catalyst through simultaneous hydrogen peroxide (H2O2) catalytic oxidation and adsorption

Su, Jing; Lyu, Tao; Cooper, Mick; Mortimer, Robert J.G.; Pan, Gang

doi:10.1016/j.jclepro.2021.129329

Cited by 19 publications

(4 citation statements)

References 50 publications

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“…Figure5shows also photooxidation experiments in the same treatments discussed above, but with H 2 O 2 addition. The accelerated oxidation fostered by H 2 O 2 observed in all cases was expected, as it has been reported that H 2 O 2 is an effective oxidant in alkali conditions[66] (working solution pH = 8.5). Experiments under solar irradiation yielded an increased oxidation, as UV light causes H 2 O 2 to undergo homolytic cleavage, generating HO •[27], whose oxidative potential of 2.73-2.8 V is only surpassed by that of fluorine[67].…”

supporting

confidence: 74%

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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supporting

confidence: 74%

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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“…This significant discrepancy could be attributed to the weak interaction between As(III) and La [ 2 , 17 , 21 ]. Therefore, the oxidation of As(III) to the less toxic As(V) in order to enhance the immobilization of arsenic and then removal via adsorption is an effective approach of As(III) removal [ 21 , 31 , 32 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

“…Su et al proposed a manganese-doped lanthanum oxycarbonate adsorbent to decontaminate As(V) but the synthetic process was complicated, and the cost of preparation was expensive because of the use of high-temperature calcination and the removal property of As(III) was studied [ 39 ]. In order to dislodge As(III), the manganese-doped lanthanum oxycarbonate adsorbent was investigated to uptake arsenic through the process of the H 2 O 2 oxidation and adsorption [ 36 ]. The difficulty of obtaining H 2 O 2 and the safety of preservation and transport in the general natural environments are the major disadvantages of the pre-oxidation by the H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption

Wang

Guo

Zhang

et al. 2022

IJERPH

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Arsenic (As(III)), more toxic and with less affinity than arsenate (As(V)), is hard to remove from the aqueous phase due to the lack of efficient adsorbents. In this study, a core–shell structured MnO2@La(OH)3 nanocomposite was synthesized via a facile two-step precipitation method. Its removal performance and mechanisms for As(V) and As(III) were investigated through batch adsorption experiments and a series of analysis methods including the transformation kinetics of arsenic species in As(III) removal, FTIR, XRD and XPS. Solution pH could significantly influence the removal efficiencies of arsenic. The adsorption process of As(V) occurred rapidly in the first 5 h and then gradually decreased, whereas the As(III) removal rate was relatively slower. The maximum adsorption capacities of As(V) and As(III) were up to 138.9 and 139.9 mg/g at pH 4.0, respectively. For As(V) removal, the inner-sphere complexes of lanthanum arsenate were formed through the ligand exchange reactions and coprecipitation. The oxidation of As(III) to the less toxic As(V) by δ-MnO2 and subsequently the synergistic adsorption process by the lanthanum hydroxide on the MnO2@La(OH)3 nanocomposite to form lanthanum arsenate were the dominant mechanisms of As(III) removal. XPS analysis indicated that approximately 20.6% of Mn in the nanocomposite after As(III) removal were Mn(II). Furthermore, a small amount of Mn(II) and La(III) were released into solution during the process of As(III) removal. These results confirm its efficient performance in the arsenic-containing water treatment, such as As(III)-contaminated groundwater used for irrigation and As(V)-contaminated industrial wastewater.

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“…Therefore, there is need to develop environmental remediation technology to eliminate these hazardous materials [ 9 , 10 , 13 , 14 ]. Different methods such as heterogeneous catalytic oxidation with H 2 O 2 [ 15 ], heterogeneous photocatalytic process [ 16 ], electrochemical oxidation [ 17 ], Fenton/photo-Fenton oxidation [ 16 , 17 ], ozonation [ 18 ], biodegradation [ 19 ], chlorination [ 20 , 21 ], combined flocculation/coagulation [ 22 ], adsorption [ 4 , 8 ], reverse osmosis [ 23 ] and UV/H 2 O 2 treatment can be used to obliterate organic pollutants [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic remediation of methylene blue using hydrothermally synthesized H-Titania and Na-Titania nanotubes

Adeleye

John

Ighalo

et al. 2022

Heliyon

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Efficient arsenic removal by a bifunctional heterogeneous catalyst through simultaneous hydrogen peroxide (H2O2) catalytic oxidation and adsorption

Cited by 19 publications

References 50 publications

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

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

Arsenic Oxidation and Removal from Water via Core–Shell MnO2@La(OH)3 Nanocomposite Adsorption

Photocatalytic remediation of methylene blue using hydrothermally synthesized H-Titania and Na-Titania nanotubes

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