Catalytic decolorization of methyl orange by the rectorite–sulfite system

Cheng, Qiang; Zhang, Ping; Ding, Yang; Dong, Huijie; Duan, Lian; Li, Xiaoxia; Xu, Aihua

doi:10.1016/j.catcom.2014.06.029

Cited by 19 publications

(6 citation statements)

References 23 publications

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“…•− precursors in previously reported investigations [6][7][8][9][10][11][12][13][14] using homogeneous or heterogeneous catalysts containing transition metals such as Fe(II) and Co(II) [15,16]. Recently, bisulfite (HSO 3 − ) has been used to replace PS or PMS in various new transition-metal-catalyzed SR-AOPs systems used for oxidation of several contaminants, such as azo dyes [17][18][19], phenols, aromatic amines, and arsenite [20][21][22]. The mechanism of radical chain reactions involving oxysulfur radicals (mainly sulfite radicals (SO [20,21].…”

Section: Introductionmentioning

confidence: 99%

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Yuan

Luo

et al. 2019

Chemical Engineering Journal

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In this paper, the efficiency of Fe(III)-S(IV) system used for advanced oxidation processes (AOPs) has been investigated using aniline as a pollutant model compound in water. The chemical kinetics, influencing factors, and mechanism of aniline oxidation are examined with an emphasis on the contribution of the different oxysulfur radicals (mainly SO 4 •− and SO 5 •−). Our results show a significant enhancement in the efficiency of aniline oxidation observed at pH 4.0 with 1.0 mM S(IV) and 0.1 mM Fe(III) concentrations. Moreover, the degradation efficiency drastically decreases to 10% in the absence of oxygen indicating the significant role of oxygen in this type of process. Through competition kinetic experiments and radical scavenger experiments, it is shown that SO 5 •− is responsible for about 60% of the aniline oxidation in the Fe(III)-S(IV) system under the typical conditions investigated in this work. For the first time we have determined the second order rate constant between SO 5 − and aniline (5.8 ± 0.6 × 10 6 M −1 s −1 (at pH 3.0) and SO 4 − and aniline 7.7 ± 0.5 × 10 9 M −1 s −1 (at pH 3.0)). Sequential experiments with successive additions of sulfite drastically improve the oxidation efficiency. These findings may provide a precise understanding of the overall mechanism and may have promising implications in developing a new cost-effective technology for the treatment of organic compounds-containing water. Furthermore, the results of this work help to understand the relevance and mechanism of organic contaminants oxidation by SO 5 •− , which has not been given much attention in conventional SR-AOPs using peroxymonosulfate.

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Section: Introductionmentioning

confidence: 99%

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Yuan

Luo

et al. 2019

Chemical Engineering Journal

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“…As shown in Fig. 13(A), in the presence of 1 mL TBA, a scavenger for hydroxyl radicals, 40 the enhancement rather than inhibition of AO7 degradation was observed, indicating that HOc was not the main active species. It is known that the activation of oxidation occurs via an electron transfer.…”

Section: Activation Mechanism Of Pms On G-c 3 Nmentioning

confidence: 91%

“…Activation mechanism of PMS on g-C 3 N 4 PMS can be activated by UV, heat and catalysts to generate sulfate radical, 38 which possess high oxidizing ability. 40 In the presence of 1 mL EtOH, the catalytic activity was obviously inhibited, implying that SO 4 À c radicals were another active species controlling the oxidation reaction, which can be Fig. 39 Besides, the active species such as photo-generated electron (e À ), photo-generated hole (h + ) and superoxide radical (O 2 À c) may also play a signicant role in the photo-catalytic reaction.…”

Section: Stability Of G-c 3 N 4 Catalystmentioning

confidence: 99%

“…The alcohols such as EtOH containing ahydrogen can react with HOc and SO 4 À c radicals at signicant rates. 40 In the presence of 1 mL EtOH, the catalytic activity was obviously inhibited, implying that SO 4 À c radicals were another active species controlling the oxidation reaction, which can be produced from the reaction of PMS and e À . The adsorption and reaction of HSO 5 À in the surface of g-C 3 N 4 catalyst can be proved by the XPS spectra of S2p for g-C 3 N 4 aer reaction.…”

Section: Activation Mechanism Of Pms On G-c 3 Nmentioning

confidence: 99%

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Metal-free activation of peroxymonosulfate by g-C₃N₄ under visible light irradiation for the degradation of organic dyes

et al. 2015

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Semiconducting carbon nitride materials (g-C 3 N 4 ) were investigated as metal-free catalysts for the activation of peroxymonosulfate (PMS) under visible light irradiation to degrade organic dyes in aqueous solution. X-ray diffraction, scanning electron microscopy, N 2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the properties of the material. The effect of several parameters including the concentration of catalyst, PMS and organic dye, and initial solution pH on its catalytic activity was also investigated. It was found that the obtained g-C 3 N 4 can effectively activate PMS under visible light irradiation to generate strong sulfate radicals which was highly active for Acid Orange 7 (AO7) and other organic dyes degradation. The catalyst also presented a long-term stability during multiple runs. Based on intermediate detections, the degradation pathway of AO7 in the g-C 3 N 4 /PMS/Vis system was proposed. This study demonstrated a promising approach for the activation of green oxidant, PMS, by the newly-developed polymer photocatalysts for environmental remediation and oxidation catalysis.

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“…Till now, REC has a variety of applications comprising catalysis, 4,5 gene delivery, drug controlled release, adsorption 5,6 and bacteria inhibition. 3 Interestingly, REC itself had no antibacterial ability, 7 but when it was blended with antibacterial cationic polymers, such as chitosan (CS), the obtained composites showed enhanced antimicrobial activity.…”

Section: Introductionmentioning

confidence: 99%

Construction of lysozyme exfoliated rectorite‐based electrospun nanofibrous membranes for bacterial inhibition

Zhan

Zeng

Jiang

et al. 2014

J of Applied Polymer Sci

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Lysozyme (LY) exfoliated rectorite (REC) based electrospun nanofibrous membranes with enhanced bacterial inhibition ability and thermostability were fabricated via electrospinning. All the obtained membranes exhibited better fiber shape and threedimensional structure, which could be observed by scanning electron microscopy. Energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, and Fourier transform infrared (FTIR) spectrum denoted the existence of LY and REC in the composite membranes. Besides, the FTIR results suggested that there were interactions between REC and polyvinyl alcohol (PVA)/LY chains. Small angle X-ray diffraction indicated that REC was exfoliated by PVA and LY chains. In addition, the exfoliation of REC was directly confirmed by transmission electron microscopy. According to Brunauer-Emmett-Teller surface area test results, PVA/LY/REC membranes had higher surface area than that of PVA/LY membranes. The performance tests showed that both the thermal stability and antibacterial activity of the composite membranes were enhanced after adding REC.

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Catalytic decolorization of methyl orange by the rectorite–sulfite system

Cited by 19 publications

References 23 publications

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Metal-free activation of peroxymonosulfate by g-C₃N₄ under visible light irradiation for the degradation of organic dyes

Construction of lysozyme exfoliated rectorite‐based electrospun nanofibrous membranes for bacterial inhibition

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Catalytic decolorization of methyl orange by the rectorite–sulfite system

Cited by 19 publications

References 23 publications

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Metal-free activation of peroxymonosulfate by g-C3N4 under visible light irradiation for the degradation of organic dyes

Construction of lysozyme exfoliated rectorite‐based electrospun nanofibrous membranes for bacterial inhibition

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Metal-free activation of peroxymonosulfate by g-C₃N₄ under visible light irradiation for the degradation of organic dyes