Optimization and assessment of Fe–electrocoagulation for the removal of potentially toxic metals from real smelting wastewater

Xu, Longqian; Xu, Xiaojun; Cao, Guangzhu; Liu, Shuli; Duan, Zhengyang; Song, Shuangshuang; Song, Mingyao; Zhang, Mengjiao

doi:10.1016/j.jenvman.2018.04.049

Cited by 50 publications

(13 citation statements)

References 40 publications

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“…However, the effluents discharged by these industries contain untreated dyes which can be toxic to human beings and aquatic life and hence their removal from contaminated wastewater is essential. Various methods such as adsorption over activated carbon (Wen et al, 2016), thermolysis, and coagulation (Yen et al, 2017), membrane separation (Cazzorla et al, 2018;Ye et al, 2018), electrochemical decolorization (Xu L. et al, 2018), photocatalytic degradation (Liu et al, 2019), and biological treatment (Banihani et al, 2018) have been widely reported for the removal of organic pollutants. Among these methods, adsorption over activated carbon is envisaged as highly effective technique.…”

Section: Introductionmentioning

confidence: 99%

Citric Acid Modified Bentonite for Congo Red Adsorption

et al. 2019

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Raw bentonite (RB) was chemically modified by citric acid (CA) to obtain a low-cost and environment-friendly citric acid incorporated bentonite (CAB) adsorbent, which was applied for the adsorptive removal of Congo Red (CR). The effect of adsorbent dosage, contact time, ionic strength, surfactant, and pH on adsorption was investigated. Adsorption equilibrium data fitted well with Langmuir model while the Langmuir adsorption capacity of CR on CAB reached up to 384 mg•g −1. Furthermore, CR adsorption on CAB followed pseudo-second kinetic model while intra-particle diffusion was not the only rate-limiting step as determined from intra-particle diffusion model investigation. RB and CAB were characterized by XRD, FT-IR, and BET techniques. A proposed mechanism for the adsorption of CR over CAB suggested the chemical adsorption phenomenon is mainly controlled by chelation, hydrogen bonding, and fixing.

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Section: Introductionmentioning

confidence: 99%

Citric Acid Modified Bentonite for Congo Red Adsorption

et al. 2019

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“…Thus, the strong acid leaching method needs to be modified to effectively recycle heavy metals without generating hazardous waste. Studies have revealed that the impurities in slag are mainly introduced by the addition of flocculants, such as polyaluminum chloride, polyferric sulfate, polysilicic acid and polyacrylamide, during smelting wastewater treatment [13][14][15] . Therefore, we hypothesized that in smelting wastewater treatment, the use of a single flocculant might effectively reduce impurities in the leaching acid and eliminate the undissolved solid.…”

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confidence: 99%

High-purity recycling of hematite and Zn/Cu mixture from waste smelting slag

Huo

Song

Zhu

et al. 2020

Sci Rep

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in this study, Zn/cu-bearing smelting slag was recycled via an integrated acid dissolution and hematite precipitation method. the slag was dissolved in nitric acid to generate an acid solution containing 23.5 g/L Fe, 4.45 g/L Zn and 2.81 g/L Cu, which was subjected to hydrothermal treatment with the addition of levulinic acid (LA). More than 99.95% of the initial Fe content was removed as hematite particles with diameters of approximately 200 nm, and the residual Fe concentration in the acid was 0.43 mg/L. The generated hematite contained 97.3% Fe 2 o 3 , 0.64% ZnO and 0.58% CuO. Greater than 99% of the initial Zn and Cu was retained in the acid and further precipitated as Zn/Cu-bearing solids by adjusting the solution pH to 9. The precipitated Zn/Cu-bearing solids contained 33.6% Zn and 21.7% Cu, whereas the Fe content was less than 0.2%. This paper is the first report of an environmentally friendly approach for recycling smelting slag without generating any hazardous waste.

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“…But needs some clarification mentioned in some of the calculated values as an erratum in Tables 3 and 4. It was better to show that how energy consumption has been determined in the text (Xu et al, 2018;Emamjomeh, 2017). Although it is clear that methodology of calculation of the energy consumption is T based on the energy rate and the removed selenium concentration.…”

Section: Dear Editormentioning

confidence: 99%

Erratum: Selenium removal from petroleum refinery wastewater using an electrocoagulation technique

Emamjomeh

2020

Journal of Hazardous Materials

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Optimization and assessment of Fe–electrocoagulation for the removal of potentially toxic metals from real smelting wastewater

Cited by 50 publications

References 40 publications

Citric Acid Modified Bentonite for Congo Red Adsorption

Citric Acid Modified Bentonite for Congo Red Adsorption

High-purity recycling of hematite and Zn/Cu mixture from waste smelting slag

Erratum: Selenium removal from petroleum refinery wastewater using an electrocoagulation technique

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