Limonite as a source of solid iron in the crystallization of scorodite aiming at arsenic removal from smelting wastewater

Li, Xuezhu; Cai, Guiyuan; Li, Yongkui; Zhu, Xing; Qi, Xianjin; Zhang, Xin; Shu, Bo; Li, Kongzhai; Wei, Yonggang; Wang, Hua

doi:10.1016/j.jclepro.2020.123552

Cited by 28 publications

(7 citation statements)

References 52 publications

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“…Limonite is a type of natural iron ore that contains hydrated iron oxides, such as, goethite, hematite, and magnetite [ 20 ]. Limonite has also been used in various applications, such as the catalytic cracking process [ 21 ], wastewater treatments [ 22 , 23 ], radiation shielding materials [ 24 ], and corrosion resistance additives [ 25 ]. Previous studies also show that limonite is an efficient catalyst for Fenton/H 2 O 2 reactions to degrade organic molecules [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Chitosan Fibers Loaded with Limonite as a Catalyst for the Decolorization of Methylene Blue via a Persulfate-Based Advanced Oxidation Process

et al. 2022

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Wastewater generated from industries seriously impacts the environment. Conventional biological and physiochemical treatment methods for wastewater containing organic molecules have some limitations. Therefore, identifying other alternative methods or processes that are more suitable to degrade organic molecules and lower chemical oxygen demand (COD) in wastewater is necessary. Heterogeneous Fenton processes and persulfate (PS) oxidation are advanced oxidation processes (AOPs) that degrade organic pollutants via reactive radical species. Therefore, in this study, limonite powder was incorporated into porous regenerated chitosan fibers and further used as a heterogeneous catalyst to decompose methylene blue (MB) via sulfate radical-based AOPs. Limonite was used as a heterogeneous catalyst in this process to generate the persulfate radicals (SO4−·) that initiate the decolorization process. Limonite–chitosan fibers were produced to effectively recover the limonite powder so that the catalyst can be reused repeatedly. The formation of limonite–chitosan fibers viewed under a field emission scanning electron microscope (FESEM) showed that the limonite powder was well distributed in both the surface and cross-section area. The effectiveness of limonite–chitosan fibers as a catalyst under PS activation achieved an MB decolorization of 78% after 14 min. The stability and reusability of chitosan–limonite fibers were evaluated and measured in cycles 1 to 10 under optimal conditions. After 10 cycles of repeated use, the limonite–chitosan fiber maintained its performance up to 86%, revealing that limonite-containing chitosan fibers are a promising reusable catalyst material.

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Section: Introductionmentioning

confidence: 99%

Chitosan Fibers Loaded with Limonite as a Catalyst for the Decolorization of Methylene Blue via a Persulfate-Based Advanced Oxidation Process

et al. 2022

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“…These studies have shown positive findings for the removal of arsenic, but due to cost and process constraints, large-scale applications are difficult to implement. Studies have also been done on the elimination of arsenic by hydrothermal scorodite (FeAsO 4 .2H 2 O) synthesis using in situ iron sources like magnetite [ 17 ], limonite [ 18 ], and hematite [ 19 , 20 ]. Scorodite is regarded as the optimal arsenic-fixing mineral [ 21 ] due to its high arsenic-loading capacity (20–30%) and low solubility in extremely acidic conditions [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

et al. 2022

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In situ treatment of acidic arsenic-containing wastewater from the non-ferrous metal smelting industry has been a great challenge for cleaner production in smelters. Scorodite and iron arsenate have been proved to be good arsenic-fixing minerals; thus, we used lead slag as an iron source to remove arsenic from wastewater by forming iron arsenate and scorodite. As the main contaminant in wastewater, As(III) was oxidized to As(V) by H2O2, which was further mineralized to low-crystalline iron arsenate by Fe(III) and Fe(II) released by lead slag (in situ generated). The calcium ions released from the dissolved lead slag combined with sulfate to form well-crystallized gypsum, which co-precipitated with iron arsenate and provided attachment sites for iron arsenate. In addition, a silicate colloid was generated from dissolved silicate minerals wrapped around the As-bearing precipitate particles, which reduced the arsenic-leaching toxicity. A 99.95% removal efficiency of arsenic with initial concentration of 6500 mg/L was reached when the solid–liquid ratio was 1:10 and after 12 h of reaction at room temperature. Moreover, the leaching toxicity of As-bearing precipitate was 3.36 mg/L (As) and 2.93 mg/L (Pb), lower than the leaching threshold (5 mg/L). This work can promote the joint treatment of slag and wastewater in smelters, which is conducive to the long-term development of resource utilization and clean production.

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“…15 Far from these various applications, other studies use hydrated iron oxyhydroxide as a catalyst for inorganic and organic processes. Examples of such methods are arsenite oxidation, 16 arsenic removal from wastewater, 17 ammonia, 18 pyridine 19 or hydrogen sulphide 20 removal from coke oven gas, coal liquefaction for oil production, 21 organic compounds removing from wastewater [22][23][24][25] and microcystin-LR hydrolysis in cancer prevention. 26 On the other hand, iron-containing systems containing bimetallic [27][28][29][30][31][32][33] or trimetallic layered oxyhydroxides 27,[34][35][36] were developed, based on their tunable electronic structures and rich active sites, 37 as valuable nonprecious metal-based materials for oxygen evolution reaction (OER).…”

Section: Introductionmentioning

confidence: 99%

“…Far from these various applications, other studies use hydrated iron oxyhydroxide as a catalyst for inorganic and organic processes. Examples of such methods are arsenite oxidation, 16 arsenic removal from wastewater, 17 ammonia, 18 pyridine 19 or hydrogen sulphide 20 removal from coke oven gas, coal liquefaction for oil production, 21 organic compounds removing from wastewater 22–25 and microcystin-LR hydrolysis in cancer prevention. 26 …”

Section: Introductionmentioning

confidence: 99%

Soft synthesis and characterization of goethite-based nanocomposites as promising cyclooctene oxidation catalysts

et al. 2021

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Limonite as a source of solid iron in the crystallization of scorodite aiming at arsenic removal from smelting wastewater

Cited by 28 publications

References 52 publications

Chitosan Fibers Loaded with Limonite as a Catalyst for the Decolorization of Methylene Blue via a Persulfate-Based Advanced Oxidation Process

Chitosan Fibers Loaded with Limonite as a Catalyst for the Decolorization of Methylene Blue via a Persulfate-Based Advanced Oxidation Process

Utilization of Lead Slag as In Situ Iron Source for Arsenic Removal by Forming Iron Arsenate

Soft synthesis and characterization of goethite-based nanocomposites as promising cyclooctene oxidation catalysts

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