Synthesis of the mesoporous carbon-nano-zero-valent iron composite and activation of sulfite for removal of organic pollutants

Xu, Jing; Wang, Xiaoren; Pan, Feng; Qin, Yi; Xia, Jun; Li, Jinjun; Wu, Feng

doi:10.1016/j.cej.2018.07.030

Cited by 69 publications

(17 citation statements)

References 47 publications

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“…Meanwhile, the wide peaks at 2θ = 10°and 20°generally ascribed to the semicrystalline structure of CS . [34] The AC=CS =ZVI nanocomposite has a significant peak at 2θ = 44°, which elucidates formation of ZVI as [35] reported. The AC and CS overlap peaks at 2θ = 15-35°.…”

Section: X-ray Diffraction (Xrd)supporting

confidence: 61%

The Role of Adsorption‐Fenton Oxidation in Degradation of Phenolic Contaminants by Fabrication of Bionanocomposite from Industrial Residue

et al. 2022

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Phenolic contaminants have acquired notable attention in recent years owing to their high toxicity even at low concentrations. This study reports the potential of cost‐effective activated carbon/chitosan/zero‐valent iron nanocomposite obtained from industrial waste residues on the adsorption and degradation of phenol, 2‐chlorophenol, and 2,4‐dichlorophenol from aqueous solution. The Fenton oxidation can supplement the pre‐adsorption process by altering to less hazardous compounds. The impact of initial concentration, contact time, nanocomposite dosage, pH, oxidant dosage, and temperature were monitored. The best matches among three adsorption isotherms Langmuir, Freundlich, and Harkins‐Jura were to Freundlich isotherm and the maximum adsorption capacity of phenol, 2‐chlorophenol and 2,4‐dichlorophenol reached 50.2512, 119.0476 and 114.9425 mg/g respectively. Furthermore, the activation energy, kinetic and thermodynamic parameters of Fenton‐oxidation were perused and affirmed that Fenton reactions are spontaneous with no energy barriers. The removal efficiency of phenol, 2‐chlorophenol, and 2,4‐dichlorophenol by synthesized nanocomposite was 97.7 %, 98.9 %, and 99 %, respectively.

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Section: X-ray Diffraction (Xrd)supporting

confidence: 61%

The Role of Adsorption‐Fenton Oxidation in Degradation of Phenolic Contaminants by Fabrication of Bionanocomposite from Industrial Residue

et al. 2022

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“…•− through a series of reactions 48 (eqs 9−12), which was dominant, and (2) sulfite obtained an electron on the anode to generate SO 3…”

Section: +mentioning

confidence: 99%

Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

Song

Zhou

et al. 2021

ACS EST Water

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Electro-Fenton (EF) has received widespread attention in terms of water decontamination in advanced oxidation processes but still has the bottlenecks of a narrow pH (∼3) application range and a slow rate of reduction of the iron ion to sustain high treatment efficiency. Herein, an iron–carbon catalyst was synthesized to develop a heterogeneous EF/sulfite (hetero-EF/sulfite) process, which expanded the pH application range to 7 and increased the rate constant of carbamazepine (CBZ) degradation 10.74 times compared with that of the hetero-EF process. The catalyst was systematically characterized; important process factors such as the applied current, initial pH, and CBZ, catalyst, and sulfite dosage were investigated, and a possible degradation mechanism and a possible pathway were proposed. The quenching experiments and electron paramagnetic resonance test revealed the existence of active species such as •OH, SO4 •–, O2 •–, 1O2, and their mutual transformation, in which •OH and O2 •– were dominant. This work also verified the suitability of the hetero-EF/sulfite for different pollutants, and its universal enhancement for different heterogeneous and homogeneous catalysts. This modified EF process expands the pH application range and enables the co-generation and transformation of free radicals, which has broad prospects for application in the effective degradation of organic pollutants for water purification.

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“…As a representative of industrial organic wastewater, textile dyeing wastewater contains large numbers of refractory contaminants with high chroma and special smells, which are difficult to degrade using conventional chemical and activated sludge methods [1][2][3]. Advanced oxidation processes (AOPs) based on reactive oxidizing radicals are widely used in the treatment of organic wastewater due to the high degradation efficiencies of organic pollutants and their environmentally friendly nature [4,5]. The performance of AOPs for the degradation of refractory organic pollutants has been evaluated by Fenton and Fenton-like processes [6], ozonation [7], photocatalysis [8], photo-Fenton [9], and electrochemical oxidation [10].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photo–Fenton Removal Efficiency with Core-Shell Magnetic Resin Catalyst for Textile Dyeing Wastewater Treatment

Zhong

Yang

Feng

et al. 2021

Water

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Heterogeneous photo–Fenton reactions have been regarded as important technologies for the treatment of textile dyeing wastewaters. In this work, an efficient core-shell magnetic anion exchange resin (MAER) was prepared through in situ polymerization and used to remove reactive brilliant red (X-3B) in a UV–Fenton system. The MAER exhibited satisfactory removal efficiency for X-3B because of its highly effective catalytic activity. More than 99% of the X-3B (50 mg/L) was removed within 20 min in the UV–Fenton reaction. This is because the uniformly dispersed core-shell magnetic microsphere resin could suppress the aggregation of Fe3O4 nanoparticles and, thus, enhance the exposure of Fe reaction sites for catalytic reaction with H2O2. The good adsorption capacity of MAER also played an important role in promoting contact between X-3B and reactive radicals during the reaction. Mechanism research showed that hydroxyl radical (•OH) was the main reactive radicals for the removal of X-3B in the MAER UV–Fenton system. The MAER can be easily separated by a magnet after catalytic reactions. Moreover, the matrix effects of different substrates (Cl−, NO3−, SO42−, and humic acid) were investigated. The results showed that SO42− could be beneficial to improve the removal of X-3B but that the others decrease the removal. The MAER UV–Fenton also removed significant amounts of total organic carbon (TOC) for the X-3B solution and an actual textile dyeing industrial wastewater. The heterogeneous oxidation system established in this work may suggest prospects for practical applications in the treatment of textile dyeing wastewater.

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Synthesis of the mesoporous carbon-nano-zero-valent iron composite and activation of sulfite for removal of organic pollutants

Cited by 69 publications

References 47 publications

The Role of Adsorption‐Fenton Oxidation in Degradation of Phenolic Contaminants by Fabrication of Bionanocomposite from Industrial Residue

The Role of Adsorption‐Fenton Oxidation in Degradation of Phenolic Contaminants by Fabrication of Bionanocomposite from Industrial Residue

Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

Enhanced Photo–Fenton Removal Efficiency with Core-Shell Magnetic Resin Catalyst for Textile Dyeing Wastewater Treatment

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