Treatment of landfill leachate biochemical effluent using the nano-Fe 3 O 4 /Na 2 S 2 O 8 system: Oxidation performance, wastewater spectral analysis, and activator characterization

Liu, Zhanmeng; Li, Xian; Rao, Zhiwei; Hu, Fengping

doi:10.1016/j.jenvman.2017.12.023

Cited by 55 publications

(11 citation statements)

References 37 publications

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“…Hence, transition-metal-based heterogeneous catalyst systems have received tremendous attention for PS activation because of their environmentally friendly nature, high performance, simple operation stability, and high availability [11]. Iron (Fe)-based heterogeneous catalyst materials (e.g., Fe 3 O 4 ) have received much attention regarding frequently activating PS because of their high natural abundance, low price, and they could easily prevent secondary pollution through their recovery performance [12]. However, Fe 3 O 4 nanoparticles usually tend to aggregate in the solution, which can decrease their surface area and cause lower stability and catalytic efficiency [13].…”

mentioning

confidence: 99%

New Sustainable Approach for the Production of Fe3O4/Graphene Oxide-Activated Persulfate System for Dye Removal in Real Wastewater

Pervez

Zarra

et al. 2020

Water

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Persulfate (PS)-activated, iron-based heterogeneous catalysts have attracted significant attention as a potential advanced and sustainable water purification system. Herein, a novel Fe 3 O 4 impregnated graphene oxide (Fe 3 O 4 @GO)-activated persulfate system (Fe 3 O 4 @GO+K 2 S 2 O 8 ) was synthesized by following a sustainable protocol and was tested on real wastewater containing dye pollutants. In the presence of the PS-activated system, the degradation efficiency of Rhodamine B (RhB) was significantly increased to a level of ≈95% compared with that of Fe 3 O 4 (≈25%). The influences of different operational parameters, including solution pH, persulfate dosage, and RhB concentration, were systemically evaluated. This system maintained its catalytic activity and durability with a negligible amount of iron leached during successive recirculation experiments. The degradation intermediates were further identified through reactive oxygen species (ROS) studies, where surface-bound SO 4 − was found to be dominant radical for RhB degradation. Moreover, the degradation mechanism of RhB in the Fe 3 O 4 @GO+K 2 S 2 O 8 system was discussed. Finally, the results indicate that the persulfate-activated Fe 3 O 4 @GO catalyst provided an effective pathway for the degradation of dye pollutants in real wastewater treatment.Water 2020, 12, 733 2 of 17 many advantages, such as a higher redox potential, wide pH range (2-11), longer life span, and more efficiency over •OH that enables excellent electron transfer of the oxidant toward higher contaminant degradation [6,7]. In general, the production of sulfate radicals can be obtained through PS activation by using several strategies, such as heat, ultraviolet, ultrasound, transition metal ions, carbonaceous-based materials, base, phenol, glucose, and ascorbic acid [8]. Consequently, transition-metal-based catalysts have been widely utilized as a PS activator due to their excellent catalytic efficiency [9]. However, the drawbacks of transition-metal-based catalysts for inhomogeneous systems include poor removal efficiency, precipitation of iron (III) as sludge, and less reusability, which has hindered their widespread use [10]. Hence, transition-metal-based heterogeneous catalyst systems have received tremendous attention for PS activation because of their environmentally friendly nature, high performance, simple operation stability, and high availability [11]. Iron (Fe)-based heterogeneous catalyst materials (e.g., Fe 3 O 4 ) have received much attention regarding frequently activating PS because of their high natural abundance, low price, and they could easily prevent secondary pollution through their recovery performance [12]. However, Fe 3 O 4 nanoparticles usually tend to aggregate in the solution, which can decrease their surface area and cause lower stability and catalytic efficiency [13]. Taking this into consideration, it is necessary to use a proper support that can enhance their overall performance. Graphene has been widely reported to be an emerging supporting material f...

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mentioning

confidence: 99%

New Sustainable Approach for the Production of Fe3O4/Graphene Oxide-Activated Persulfate System for Dye Removal in Real Wastewater

Pervez

Zarra

et al. 2020

Water

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“…In other study, maximum COD removal efficiency was found as 69% at pH 3 under Fe 2+ /S2O8 ratio of 6 for the treatment saline recalcitrant petrochemical wastewater [18]. Because when the pH is above 4, iron deactivation occurs which leads to the formation of iron hydroxide complexes having the high stability and low catalytic activity [14], [28]- [29]. Another reason for increasing removal efficiencies at pH ≤ 4 is that H2O2 is produced by the hydrolysis of S2O8 and together with H2O2 and Fe 2+ may form extra OH radicals by Fenton reaction [30].…”

Section: Effect Of Ph For Fe 2+ /S2o8 Oxidation Processmentioning

confidence: 93%

“…3 and Eq. 4 [14]. However, in the case of excessive amounts of Fe 2+ , a scavenging effect of sulfate radicals occurs due to the reaction between Fe 2 + and SO4 -and oxidation efficiency decreases (Eq.…”

Section: Effect Of Fe 2+ Concentration For Fe 2+ /S2o8 Oxidation Processmentioning

confidence: 99%

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Treatment of dye-producing chemical industry wastewater by persulfate advanced oxidation

Çifçi

Güneş

2020

Environmental Research and Technology

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A dye-producing chemical industry wastewater in Çorlu (Tekirdağ) is treated by the coagulation-flocculation process of the wastewater. However, the wastewater discharged after coagulation-flocculation still has a very high COD (4402 mg L-1) with very high proportion of dissolved COD (4316 mg L-1). Therefore, the aim of this study is to achieve higher COD and color removal in wastewater using Fe 2+ /S2O8 or UV/S2O8 oxidation process after coagulation-flocculation. The processes in the oxidation of this industrial wastewater using Fe 2+ /S2O8 and UV/S2O8 were examined and the effect of COD/Fe 2+ /S2O8 ratio (in Fe 2+ /S2O8) or COD/S2O8 ratio (in UV/S2O8), pH and oxidation time were evaluated in the study. While high organic matter and color removal was observed in acidic conditions for both processes, optimum pH were 3 and 6 in Fe 2+ /S2O8 and UV/S2O8 oxidation processes, respectively. In Fe 2+ /S2O8 oxidation, 61.1% of COD removal and above 97% of color (UV436, UV525 and UV620) removal was obtained at 1/8/8 of COD/Fe 2+ /S2O8 ratio and pH 3 after 1 h oxidation. In UV/S2O8 oxidation (COD/S2O8 ratio 1/8, pH 6), 54.4% of COD and 98% of color (UV436, UV525 and UV620) removals were achieved after 4 h oxidation. As a result, both Fe 2+ /S2O8 and UV/S2O8 oxidation processes were applied to ensure discharge standards for color removal from this chemical industry wastewater are effective methods as they provide over 97% color removal. Moreover, COD removal efficiency was approximately 55-60% in both methods.

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“…The surface microstructure with composite homogeneity was determined for extracted OPTS, and sludge after coagulation using a scanning electron microscope FEI-Quanta 450 FEG. The sample was placed on the fixed table with conductive carbon glue, squeezed to a smooth level and made dry with an iron sizzling device for 30 Å platinum coating (Liu et al, 2018). Fourier transforms infrared (FTIR) analysis was conducted for OPTS within the wavelength of 4000 and 400 cm −1 , using a Spectrum IR Tracer-100 Series FTIR (Shimadzu, Japan) to detect the functional groups.…”

Section: Spectrometric Analysismentioning

confidence: 99%

Optimization of the humic acid separation and coagulation with natural starch by RSM for the removal of COD and colour from stabilized leachate

et al. 2021

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The removal of concentrated colour (around 5039 Pt–Co) and chemical oxygen demand (COD; around 4142 mg L−1) from matured landfill leachate through a novel combination of humic acid extraction and coagulation with natural oil palm trunk starch (OPTS) was investigated in this study. Central composite design from response surface methodology of Design Expert-10 software executed the experimental design to correlate experimental factors with desired responses. Analysis of variance developed the quadratic model for four factors (e.g. coagulant dosage, slow mixing speed and time and centrifugation duration) and two responses (% removal of colour, COD). The model confirmed the highest colour (84.96%) and COD (48.84%) removal with a desirability function of 0.836 at the optimum condition of 1.68 g L−1 coagulant dose, 19.11 rpm slow mixing speed, 16.43 minutes for mixing time and 35.75 minutes for centrifugation duration. Better results of correlation coefficient ( R2 = 0.98 and 0.96) and predicted R2 (0.94 and 0.84) indicates the model significance. Electron microscopic images display the amalgamation of flocs through bridging. Fourier transforms infrared spectra confirmed the existence of selected organic groups in OPTS, which eventually signifies the applied method.

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Treatment of landfill leachate biochemical effluent using the nano-Fe 3 O 4 /Na 2 S 2 O 8 system: Oxidation performance, wastewater spectral analysis, and activator characterization

Cited by 55 publications

References 37 publications

New Sustainable Approach for the Production of Fe3O4/Graphene Oxide-Activated Persulfate System for Dye Removal in Real Wastewater

New Sustainable Approach for the Production of Fe3O4/Graphene Oxide-Activated Persulfate System for Dye Removal in Real Wastewater

Treatment of dye-producing chemical industry wastewater by persulfate advanced oxidation

Optimization of the humic acid separation and coagulation with natural starch by RSM for the removal of COD and colour from stabilized leachate

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