Removal of arsenic(III) from aqueous solution using a low-cost by-product in Fe-removal plants—Fe-based backwashing sludge

Wu, Kun; Liu, Ruiping; Li, Tao; Liu, Huijuan; Peng, Junming; Qu, Jiuhui

doi:10.1016/j.cej.2013.04.076

Cited by 60 publications

(26 citation statements)

References 45 publications

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“…On the other hand, under same conditions, As(III) affinity towards uncalcined and calcined composite adsorbents was found to be weaker as compared to that of As(V) and phosphate. Consequently, the removal efficiency of As(III) was lowered and consistent with the findings reported in previous studies [9], [39]. Moreover, our work showed the probable effect of solution pH, As(V) and As(III) concentrations, calcination environment, temperature, contact time and the effects of phosphate anions on As(V) and As(III) removal.…”

Section: Resultssupporting

confidence: 92%

“…Our results demonstrated that with the increase in temperature from 25°C to 45°C, the adsorption capacities of the adsorbent composites were slightly increased (Table S1). This showed that the adsorption process is an endothermic and controlled by the intraparticle and pore diffusion [3], [9]. The mobility of adsorbent ions increases with the increase of the aqueous temperature, thus increasing the adsorptive capacity of the adsorbent composites.…”

Section: Resultsmentioning

confidence: 97%

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Arsenic Removal from Aqueous Solutions Using Fe3O4-HBC Composite: Effect of Calcination on Adsorbents Performance

et al. 2014

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The presence of elevated concentration of arsenic in water sources is considered to be health hazard globally. Calcination process is known to change the surface efficacy of the adsorbent. In current study, five adsorbent composites: uncalcined and calcined Fe3O4-HBC prepared at different temperatures (400°C and 1000°C) and environment (air and nitrogen) were investigated for the adsorptive removal of As(V) and As(III) from aqueous solutions determining the influence of solution's pH, contact time, temperature, arsenic concentration and phosphate anions. Characterizations from FTIR, XRD, HT-XRD, BET and SEM analyses revealed that the Fe3O4-HBC composite at higher calcination temperature under nitrogen formed a new product (fayalite, Fe2SiO4) via phase transformation. In aqueous medium, ligand exchange between arsenic and the effective sorbent site ( = FeOOH) was established from the release of hydroxyl group. Langmuir model suggested data of the five adsorbent composites follow the order: Fe3O4-HBC-1000°C(N2)>Fe3O4-HBC (uncalcined)>Fe3O4-HBC-400°C(N2)>Fe3O4-HBC-400°C(air)>Fe3O4-HBC-1000°C(air) and the maximum As(V) and As(III) adsorption capacities were found to be about 3.35 mg g−1 and 3.07 mg g−1, respectively. The adsorption of As(V) and As(III) remained stable in a wider pH range (4–10) using Fe3O4-HBC-1000°C(N2). Additionally, adsorption data fitted well in pseudo-second-order (R 2>0.99) rather than pseudo-first-order kinetics model. The adsorption of As(V) and As(III) onto adsorbent composites increase with increase in temperatures indicating that it is an endothermic process. Phosphate concentration (0.0l mM or higher) strongly inhibited As(V) and As(III) removal through the mechanism of competitive adsorption. This study suggests that the selective calcination process could be useful to improve the adsorbent efficiency for enhanced arsenic removal from contaminated water.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Arsenic Removal from Aqueous Solutions Using Fe3O4-HBC Composite: Effect of Calcination on Adsorbents Performance

et al. 2014

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“…Among these, adsorption technique is considered one of the most popular and practical methods for arsenic removal due to its high efficiency, low cost and reusable characteristics [7,8]. More and more attentions have been paid on the development of high performance adsorbents including natural and synthetic materials to control the arsenic pollution [9].…”

Section: Introductionmentioning

confidence: 99%

Enhanced arsenate removal by novel Fe–La composite (hydr)oxides synthesized via coprecipitation

Zhang

et al. 2014

Chemical Engineering Journal

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h i g h l i g h t sFe-La composite (hydr)oxides were synthesized via coprecipitation method. Fe-La composite (hydr)oxides were effective for arsenate removal from water. As(V) was removed by both precipitation and sorption under acidic condition. As(V) removal was achieved by adsorption under alkaline condition. t r a c tArsenic exists ubiquitously in the environment and has been proved to be of great harm to human health. In this study, a series of Fe-La composite (hydr)oxides were synthesized via a facile coprecipitation for effective As(V) removal from aqueous solution. A variety of techniques including BET surface area measurement, powder XRD, SEM, and XPS were employed to characterize the synthetic Fe-La composite (hydr)oxides. Fe-La composite (hydr)oxides grains were formed via aggregation of primary nanoparticles. With an increase in La content, the specific surface area of Fe-La composite (hydr)oxides decreased, but the pore diameter, the pore volume and the grain size of Fe-La composite (hydr)oxides increased gradually. Rapid As(V) adsorption on the synthesized composite oxides was achieved and the adsorption was well fitted by the pseudo-second-order equation. The adsorption isotherms could be well described by Langmuir equation and the maximal adsorption capacity of Fe-La composite (hydr)oxides can reach 368 mg/g. The As(V) removal was pH-dependent and decreased with an increase in pH value, especially in alkaline condition. Under acidic and neutral conditions, As(V) removal was mainly achieved by both precipitation and adsorption. By contrast, adsorption is the only mechanism for As(V) removal in alkaline condition. The results indicate that the Fe-La composite (hydr)oxides could be potentially attractive adsorbents for As(V) removal.

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“…The low-intensity XRD peaks are indicative of quartz and calcite. All GWTRs presented in this research [40,53,61] show a similar phase composition, indicating that sludge are rather amorphous material; the only crystalline mineral that was found was quartz [40].…”

Section: Groundwater Treatment Residualsmentioning

confidence: 57%

“…Most of the research is focused on the precipitation of phosphorous from wastewater [56,57]. Researchers indicate that WTRs are characterized by good sorption properties [51,[58][59][60][61]. The aim of the present research was to present a review of the studies that have evaluated WTRs as heavy metals sorbents.…”

Section: Introductionmentioning

confidence: 99%

Removal of Heavy Metals and Metalloids from Water Using Drinking Water Treatment Residuals as Adsorbents: A Review

et al. 2019

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Heavy metal contamination is one of the most important environmental issues. Therefore, appropriate steps need to be taken to reduce heavy metals and metalloids in water to acceptable levels. Several treatment methods have been developed recently to adsorb these pollutants. This paper reviews the ability of residuals generated as a by-product from the water treatment plants to adsorb heavy metals and metalloids from water. Water treatment residuals have great sorption capacities due to their large specific surface area and chemical composition. Sorption capacity is also affected by sorption conditions. A survey of the literature shows that water treatment residuals may be a suitable material for developing an efficient adsorbent for the removal of heavy metals and metalloids from water.

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Removal of arsenic(III) from aqueous solution using a low-cost by-product in Fe-removal plants—Fe-based backwashing sludge

Cited by 60 publications

References 45 publications

Arsenic Removal from Aqueous Solutions Using Fe3O4-HBC Composite: Effect of Calcination on Adsorbents Performance

Arsenic Removal from Aqueous Solutions Using Fe3O4-HBC Composite: Effect of Calcination on Adsorbents Performance

Enhanced arsenate removal by novel Fe–La composite (hydr)oxides synthesized via coprecipitation

Removal of Heavy Metals and Metalloids from Water Using Drinking Water Treatment Residuals as Adsorbents: A Review

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