Linkage of iron elution and dissolved oxygen consumption with removal of organic pollutants by nanoscale zero-valent iron: Effects of pH on iron dissolution and formation of iron oxide/hydroxide layer

Fujioka, Nanae; Suzuki, Moe; Kurosu, Shunji; Kawase, Y.

doi:10.1016/j.chemosphere.2015.10.064

Cited by 47 publications

(12 citation statements)

References 24 publications

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“…Furthermore, higher pH conditions that could accelerate the precipitation of ferrous ions and hydroxides onto biochar surface significantly contributed to the decreasing TC oxidation. Similar results were also reported in previous studies [31,43]. From the achieved results, pH = 2 seemed to be suitable to apply in further experiments of TC degradation in this study.…”

Section: Effect Of the Initial Ph On Tc Degradationsupporting

confidence: 90%

Efficient Heterogeneous Activation of Persulfate by Iron-Modified Biochar for Removal of Antibiotic from Aqueous Solution: A Case Study of Tetracycline Removal

et al. 2019

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Waste reutilization is always highly desired in the environmental engineering and science community. In this study, Fe-SCG biochar was functionalized by modifying spent coffee grounds (SCG) with magnetite (Fe3+) at 700 °C and applied for the oxidative removal of tetracycline (TC) with the presence of persulfate (PS). The effects of pH, dosage of biochar and sodium persulfate and initial TC concentration on TC degradation were investigated in a batch system. Our results show that higher TC degradation efficiency was obtained at low pH, low initial TC concentration, and at high dosages of PS and biochar. The highest removal efficiency (96%) was achieved by Fe-SCG/PS under the conditions of pH = 2.0, [Fe-SCG] = 2.5 g/L, [PS] = 60 mM and [TC] = 1 mM. The proposed Fe-SCG catalyst could be a promising effective biochar for the remediation of other emerging organic contaminants.

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Section: Effect Of the Initial Ph On Tc Degradationsupporting

confidence: 90%

Efficient Heterogeneous Activation of Persulfate by Iron-Modified Biochar for Removal of Antibiotic from Aqueous Solution: A Case Study of Tetracycline Removal

et al. 2019

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“…This color removal behavior of AG25 and AR1 could be explained on the basis of easy adsorption of dye molecule [44][45][46] on Fe 0 surface initially because of the strong adsorption and reduction ability of ZVI. At a later stage, the reduction in the color removal rate might be due to corrosion product formation, which are responsible for active sites deactivation on Fe 0 surface (equations (17)- (19)) and resultantly, the color removal capacity of ZVI decreased [28]. The effect of reaction time was comparable with some previous reported studies i.e., diazepam color removal of 96% after 60 min using Fe 0 ions was achieved.…”

Section: Effect Of Reaction Timesupporting

confidence: 84%

“…The coagulation took place through iron oxides/hydroxides. Eluted Fe 2+ is oxidized to Fe 3+ and then, Fe 2+ and Fe 3+ react with OH − to produce iron hydroxides, which remove pollutants by coagulation/sedimentation process [28]. 3 3 In view of efficient catalytic properties of ZVI, present study was designed to synthesize ZVI and its application for the degradation of AG25 and AR1 dyes (figure 1).…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of zero valent iron and photocatalytic application for the degradation of dyes

Bhatti

Iram

Iqbal

et al. 2020

Mater. Res. Express

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In the present investigation, Zero valent iron (ZVI) was synthesized using ferrous sulfate and borohydrate in the presence of EDTA and characterized by x-ray Diffraction (XRD), Energydispersive x-ray (EDX) and Scanning electron microscope (SEM) techniques. The prepared ZVI catalytic activity was evaluated by degrading Acid Red 1 (AR1) and Acid Green 25 (AG25) dyes. The process variables such as pH, initial dye concentration, ZVI dose, contact time, hydrogen peroxide (H 2 O 2 ) and temperature were optimized for maximum dye degradation. AG25 removal was 98% at pH 4, ZVI dose 0.2 g l −1 , initial dye concentration 50 mg l −1 , 90 min reaction time and 8 mM H 2 O 2 concentration, whereas pH 2, ZVI dose 0.1 g l −1 , 50 mg l −1 initial dye concentration, 8 mM H 2 O 2 and 90 min were found to be optimum for AR1 maximum degradation of 91.60%. Behnajady-Modirshahla-Ghanbery kinetic model and thermodynamic study revealed the spontaneity and endothermic nature of the process. Results revealed that ZVI has potential to degrade the dyes and could possibly be used for the degradation of dyes in wastewater.

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“…Under the magnetic stirrer, the magnetic field increased the treatment efficiency [56,57]. It was also proved that radical generation is higher in oxic conditions [50], with a bigger amount of dissolved oxygen [58], or with more intensive stirring [53]. The presented reasons for decreasing the efficiency of the conducted process are only hypotheses, not confirmed speculations, and require further confirmation.…”

Section: Fe 0 /H 2 O 2 Processmentioning

confidence: 96%

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

Bogacki

Marcinowski

El-Khozondar

2019

Water

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One of the major environmental concerns associated with waste disposal is the large amount of generated landfill leachates (LL), which are considered a type of wastewater with a complex composition. There is an urgent need to find an effective LL treatment method. LL were subjected to pretreatment followed by the Fe0/H2O2 process. Pretreatment efficiency was coagulation at pH 6.0 >> coagulation at pH 9.0 > acidification at pH 3.0. Coagulation at pH 6.0 in an optimal Fe3+ dose of 1000 mg/L decreased total organic carbon (TOC) from the initial concentration of 1061 mg/L to 491 mg/L while acidification to pH 3.0 decreased TOC to 824 mg/L. After acidification, the Fe0/H2O2 process with 8000/9200 mg/L Fe0/H2O2 reagent doses decreased TOC to 499 mg/L after a processing time of 60 min. Performance of the Fe0/H2O2 process after coagulation at pH 6.0 for optimal Fe0/H2O2 8000/5540 mg/L reagent doses decreased TOC to 268 mg/L (75% TOC removal). Treatment of landfill leachates with combined process coagulation and Fe0/H2O2 also increased their susceptibility to biodegradation, expressed as the biochemical oxygen demand/chemical oxygen demand (BOD5/COD) ratio from 0.13 to 0.43, allowing LL to be considered as susceptible to biodegradation. Fe0/H2O2 process kinetics was described. A statistical analysis confirmed the obtained results. The proposed method can be successfully applied for LL treatment.

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Linkage of iron elution and dissolved oxygen consumption with removal of organic pollutants by nanoscale zero-valent iron: Effects of pH on iron dissolution and formation of iron oxide/hydroxide layer

Cited by 47 publications

References 24 publications

Efficient Heterogeneous Activation of Persulfate by Iron-Modified Biochar for Removal of Antibiotic from Aqueous Solution: A Case Study of Tetracycline Removal

Efficient Heterogeneous Activation of Persulfate by Iron-Modified Biochar for Removal of Antibiotic from Aqueous Solution: A Case Study of Tetracycline Removal

Facile synthesis of zero valent iron and photocatalytic application for the degradation of dyes

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

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