Zeolite-supported nanoscale zero-valent iron: New findings on simultaneous adsorption of Cd(II), Pb(II), and As(III) in aqueous solution and soil

Li, Zhangtao; Wang, Lu; Meng, Jun; Liu, Xingmei; Xu, Jianming; Wang, Fan; Brookes, Philip C.

doi:10.1016/j.jhazmat.2017.09.036

Cited by 448 publications

(86 citation statements)

References 47 publications

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“…Although several studies report that arsenite removal decreases at highly alkaline pH [22,[64][65][66]. There are some adsorbent materials that showed an increment in the arsenite adsorption capacity as pH increases, such as fly ash [67,68], Mn-natural zeolite [34] and clinoptilolite-supported nanoscale zero-valent iron [40]. This behaviour has been associated to the presence of calcium in the adsorbent where calcium ions tend to form insoluble calcium arsenate.…”

Section: Adsorbent Efficiency As Function Of the Ph And The Presence mentioning

confidence: 99%

“…Nevertheless, the ion-exchange capacity of zeolites depends on the framework structure, ion size and shape and ionic charge and concentration of the external electrolyte solution [31]. Some natural [32][33][34][35] and synthetic zeolites [36][37][38] have been modified with iron and evaluated for arsenic adsorption, however, studies of the adsorption of As (III) by Fe-modified zeolites are scarce [39,40].In the present work, the effect of pH, temperature, concentration, adsorbent dose and ion competition on the adsorption process of As (III) on Fe-modified W zeolite was studied. Additionally, kinetic and thermodynamic studies of As (III) adsorption on this zeolite were carried out.…”

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confidence: 99%

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Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Medina-Ramírez

Gamero‐Melo²,

Ruiz-Camacho

et al. 2019

Water

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The high toxicity of arsenite and the difficulty to remove it is one of the main challenges for water treatment. In the present work the surface of a low cost zeolite was modified by chemical treatment with a ferrous chloride to enhance its arsenite adsorption capacity. The effect of pH, ions coexistence, concentration, temperature and dosage was studied on the adsorption process. Additionally, the Fe-modified W zeolite was aged by an accelerated procedure and the regeneration of the exhausted zeolite was demonstrated. The Fe-modified W zeolite was stable in the pH range of 3 to 8 and no detriment to its arsenite removal capacity was observed in the presence of coexisting ions commonly found in underground water. The studies showed that the adsorption of As (III) on Fe-modified W zeolite is a feasible, spontaneous and endothermic process and it takes place by chemical bonding. The exhausting process proved the adsorption of 0.20 mg g−1 of As (III) by the Fe-modified W zeolite and this withstand at least five aging cycles without significant changes of its arsenite adsorption capacity. Fe-modified W zeolite prepared from fly ash might be a green and low-cost alternative for removal of As (III) from groundwater.

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Section: Adsorbent Efficiency As Function Of the Ph And The Presence mentioning

confidence: 99%

mentioning

confidence: 99%

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Medina-Ramírez

Gamero‐Melo²,

Ruiz-Camacho

et al. 2019

Water

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“…The band at 1,109 cm −1 of ZVI/Cu polyscale particle changed into 1,119 cm −1 for ZVI/Cu‐RB, which might be resulted from the formation of hydrogen‐bonded O–H between the degradation products(such as the compounds with –C–H, –O–H, –C–O, or –N–H) (Lai et al, ). Two prominent bands at 887/885 and 792/795 cm −1 were due to Fe–O–H bending vibration (Gotić & Musić, ), and the adsorption at 444–607 cm −1 were originated from Fe–O stretching vibration in iron oxide (Gotić & Musić, ; Li et al, ).…”

Section: Resultsmentioning

confidence: 99%

Reductive performance of ZVI/Cu polyscale particle to decolorize reactive black 5

Deng

Zhang

Jiang

et al. 2018

Microscopy Res & Technique

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Based on direct reducing of copper ions by commercially available zero valent iron (ZVI), ZVI/Cu polyscale particles with high activation are synthesized and exhibit significant removal efficiency for reactive black (RB) dye. The ZVI/Cu polyscale particles could maintain a good performance for RB removal at a wide pH range of 3.0-9.0. Different from the mineralization process of other organic pollutants in ZVI/Cu system, the degradation kinetics of RB could be described well by novel pseudo-second kinetic models. Results of scanning electron microscopy (SEM), X-ray fluorescence elemental analysis (EDX), and X-ray diffraction (XRD) show the planting Cu has deposited on the surface of Fe 0 . The characterization of ZVI/Cu particles and RB solution before and after degradation reveals that decolorization of RB is not only resulted from the reduction process including direct reduction by accepting electrons from Fe 0 oxidation and indirect reduction by atomic hydrogen generated on the ZVI/Cu surface, but also the oxidation of hydroxyl radicals in the mineralization procedure of RB dye. K E Y W O R D Sdecolorization of reactive black, reduction, ZVI/cu polyscale particle

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“…[1][2][3][4][5] These pollutants include organic compounds (such as organic pesticides, polycyclic aromatic hydrocarbons, and phenols) and inorganic substances (such as As(III), Cd(II), and Cr(VI)). [6][7][8][9][10][11] They have been continuously accumulated and enriched in water, air, and soil, [12][13][14][15] and causing serious damage to the natural environment and threatening the survival of animals, plants and human beings. Therefore, scientists have made a lot of explorations to try to control and solve the energy crisis and environmental problems, [15][16][17][18][19][20] to enable the energy sustainability, and to eliminate environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Strategies for Improving the Performance and Application of MOFs Photocatalysts

Luo

Wu³

et al. 2019

ChemCatChem

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Residual pollutants in the water treatment process restrict the advanced treatment and purification of wastewater, because most of them have stable structures, and some are not easily to be enriched. Photocatalytic oxidation technology can directly use solar energy to drive a series of chemical reactions, which has advantages such as low energy consumption, mild reaction conditions and rarely secondary pollution. It is an effective way to solve the organic pollution problem in wastewater treatment. The key to this process is to find and design efficient photocatalysts. The current photocatalytic materials mainly include inorganic semiconductors and metal organic frameworks (MOFs). They have been studied for pollutants degradation, hydrogen evolution, CO2 reduction, and organic transformation. But, most of these catalysts have not been used in real application. In this paper, recent research advances in MOFs photocatalysts and the key factors affecting their photocatalytic efficiency were critically reviewed. It is believed that the pursuit of more efficient photocatalyst needs to be considered from the adsorption‐photocatalytic mechanism, redox‐free radical mechanism, valence‐level regulation mechanism and energy transfer mechanism of photocatalysis. It is very necessary to research and develop nanoscale and quantum level mixed valence MOFs photocatalysts, which are constructed by strong electron‐donating groups.

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Zeolite-supported nanoscale zero-valent iron: New findings on simultaneous adsorption of Cd(II), Pb(II), and As(III) in aqueous solution and soil

Cited by 448 publications

References 47 publications

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Reductive performance of ZVI/Cu polyscale particle to decolorize reactive black 5

Strategies for Improving the Performance and Application of MOFs Photocatalysts

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