Enhanced removal of arsenite and arsenate by a multifunctional Fe-Ti-Mn composite oxide: Photooxidation, oxidation and adsorption

Zhang, Wei; Zhang, Gaosheng; Liu, Caihong; Li, Juan; Zheng, Tao; Ma, Jun; Wang, Lu; Jiang, Jin; Zhai, Xuedong

doi:10.1016/j.watres.2018.10.001

Cited by 148 publications

(26 citation statements)

References 57 publications

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“…9e, the peak at 45.6 eV can be ascribed to As(V). 47 However, the peak at 45.6 eV was very weak, suggesting that only a very small amount of arsenic was adsorbed on the photocatalyst, which is coincident with the photocatalytic experiment results. Fig.…”

Section: Photocatalytic Oxidation Performancesupporting

confidence: 79%

“…12 In theory, oxidation of As(III) can be realized using many chemical oxidants such as hydrogen peroxide, ozone, chlorine dioxide, chlorine, and potassium permanganate. [13][14][15] However, despite the effective oxidation of As(III), the use of chemical oxidants causes excess hazardous by-products and subsequent cleaning problems. To address these issues, several studies were made to remove arsenic from drinking water by means of photocatalytic oxidation for the merits of low power, easy handing, and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Bi₂WO₆/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

et al. 2019

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Section: Photocatalytic Oxidation Performancesupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Synthesis of Bi₂WO₆/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

et al. 2019

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“…As a consequence, As concentration in natural aqueous environments is essentially controlled by interactions with mineral surfaces. Composite oxides have also been developed to enhance their efficiency as oxidants and adsorbents for both As(III) and As(V) (Chakravarty et al, 2002;Feng et al, 2006a;Ma et al, 2020;McCann et al, 2018;Wu et al, 2018;Ying et al, 2012;Zhang et al, 2007;Zhang et al, 2018;Zheng et al, 2020). Manganese (Mn) oxides can also oxidize As(III) (Manning et al, 2002;Scott and Morgan, 1995), as reported in natural lacustrine environments (Oscarson et al, 1980(Oscarson et al, , 1981a(Oscarson et al, , 1981b, and Mn oxides have a key role in As geochemical cycling (Driehaus et al, 1995;Nesbitt et al, 1998;Scott and Morgan, 1995;Tournassat et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Highly enhanced oxidation of arsenite at the surface of birnessite in the presence of pyrophosphate and the underlying reaction mechanisms

et al. 2020

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Manganese(IV) oxides, and more especially birnessite, rank among the most efficient metal oxides for As(III) oxidation and subsequent sorption, and thus for arsenic immobilization. Efficiency is limited however by the precipitation of low valence Mn (hydr)oxides at the birnessite surface that leads to its passivation. The present work investigates experimentally the influence of chelating agents on this oxidative process. Specifically, the influence of sodium pyrophosphate (PP), an efficient Mn(III) chelating agent, on As(III) oxidation by birnessite was investigated using batch experiments and different arsenic concentrations at circum-neutral pH. In the absence of PP, Mn(II/III) species are continuously generated during As(III) oxidation and adsorbed to the mineral surface. Field emission-scanning electron microscopy, synchrotron-based X-ray diffraction and Fourier transform infrared spectroscopy indicate that manganite is formed, passivating birnessite surface and thus hampering the oxidative process. In the presence of PP, generated Mn(II/III) species form soluble complexes, thus inhibiting surface passivation and promoting As(III) conversion to As(V) from 60% in the absence of PP to 100% with 3 mM PP (0.5 mM initial As(III)). Enhancement of As(III) oxidation by Mn oxides strongly depends on the affinity of the chelating agent for Mn(III) and from the induced stability of Mn(III) complexes. Compared to PP, the positive influence of oxalate, for example, on the oxidative process is more limited. The present study thus provides new insights into the possible optimization of arsenic removal from water using Mn oxides, and on the possible environmental control of arsenic contamination by these ubiquitous non-toxic mineral species.

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“…This suggested that doping nFe3O4 changed the functional groups related to -COO-, but these functional groups did not participate in the removal of Sb(III). The peak of 1635 cm −1 was stronger after HRM was modified by nFe3O4, but was not obviously changed after the adsorption of Sb(III) [47,70,73]. It can be found that strong band at 3420 cm −1 (O-H stretching vibration) weakened after adsorption, indicating that the hydroxyl groups on the absorbent surface were involved in the Sb(III) adsorption [40,74].…”

Section: Influence Of Functional Groupsmentioning

confidence: 93%

Efficient Removal of Antimony(III) in Aqueous Phase by Nano-Fe3O4 Modified High-Iron Red Mud: Study on Its Performance and Mechanism

Peng

Luo

et al. 2021

Water

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The resource utilization of excess red mud produced from aluminum production is a current research focus. In this study, novel nano-Fe3O4 modified high-iron red mud material (HRM@nFe3O4) was fabricated using the method of co-precipitation to remove Sb(III) from the aqueous phase. The HRM@nFe3O4 at a nFe3O4:HRM mass ratio of 1:1 had optimal adsorbing performance on Sb(III) in water. Compared with others, the synthetic HRM@nFe3O4 sorbent had a superior maximum Sb(III) adsorption capacity of 98.03 mg·g−1, as calculated by the Langmuir model, and a higher specific surface area of 171.63 m2·g−1, measured using the Brunauer-Emmett-Teller measurement. The adsorption process was stable at an ambient pH range, and negligibly limited by temperature the coexisting anions, except for silicate and phosphate, suggesting the high selectivity toward Sb(III). HRM@nFe3O4 retained more than 60% of the initial adsorption efficiency after the fifth adsorption-desorption cycle. The kinetic data fitted by the pseudo-second-order model illustrated the existence of a chemical adsorption process in the adsorption of Sb(III). Further mechanism analysis results indicated that the complexation reaction played a major role in Sb(III) adsorption by HRM@nFe3O4. This HRM@nFe3O4 adsorbent provides an effective method for the removal of Sb(III) in wastewater treatment and is valuable in the reclamation of red mud.

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Enhanced removal of arsenite and arsenate by a multifunctional Fe-Ti-Mn composite oxide: Photooxidation, oxidation and adsorption

Cited by 148 publications

References 57 publications

Synthesis of Bi₂WO₆/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

Synthesis of Bi₂WO₆/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

Highly enhanced oxidation of arsenite at the surface of birnessite in the presence of pyrophosphate and the underlying reaction mechanisms

Efficient Removal of Antimony(III) in Aqueous Phase by Nano-Fe3O4 Modified High-Iron Red Mud: Study on Its Performance and Mechanism

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Enhanced removal of arsenite and arsenate by a multifunctional Fe-Ti-Mn composite oxide: Photooxidation, oxidation and adsorption

Cited by 148 publications

References 57 publications

Synthesis of Bi2WO6/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

Synthesis of Bi2WO6/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

Highly enhanced oxidation of arsenite at the surface of birnessite in the presence of pyrophosphate and the underlying reaction mechanisms

Efficient Removal of Antimony(III) in Aqueous Phase by Nano-Fe3O4 Modified High-Iron Red Mud: Study on Its Performance and Mechanism

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Synthesis of Bi₂WO₆/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight

Synthesis of Bi₂WO₆/Na-bentonite composites for photocatalytic oxidation of arsenic(iii) under simulated sunlight