Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

Chen, Fayuan; Zhao, Xu; Liu, Huijuan; Qu, Jiuhui

doi:10.1016/j.cej.2014.05.039

Cited by 29 publications

(4 citation statements)

References 36 publications

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“…It is noted that the electron transfer is crucial for the photooxidation. ,, The mechanism involving electron transfer is proposed and confirmed by ESR spectroscopy (Figure c,d and Figure S13). , The full description of the mechanism, involving electron transfer for the photooxidative aromatization of DHP catalyzed by ZnCu-CDs, is proposed in Figure d. First, CDs were photoexcited into the excited state (CDs*) and subsequent electron transfer from DHP (electron donor) to CDs* (electron acceptor) produced the CDs •– (Zn d+ → Zn 2+ and Cu 2+ → Cu 1+ ) and DHP radical cation (DHP +• ).…”

Section: Resultsmentioning

confidence: 99%

Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

Zhang

Wang

et al. 2017

ACS Catal.

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Unsaturated metal species (UMS) confined in nanomaterials play important roles for electron transfer in a wide range of catalytic reactions. However, the limited fabrication methods of UMS restrict their wider catalytic applications. Here, we report on the synergy of unsaturated Zn and Cu dopants confined in carbon dots (ZnCu-CDs) to produce enhanced electron transfer and photooxidation processes in the doped CDs. The Zn/Cu species chelate with the carbon matrix mainly through Cu–O(N)–Zn–O(N)–Cu complexes. Within this structure, Cu2+ acts as a mild oxidizer that facilely increases the unsaturated Zn content and also precisely tunes the unsaturated Zn valence state to Zn d+, where d is between 1 and 2, instead of Zn0. With the help of UMS, electron-transfer pathways are produced, enhancing both the electron-donating (7.0 times) and -accepting (5.3 times) abilities relative to conventional CDs. Because of these synergistic effects, the photocatalytic efficiency of CDs in photooxidation reactions is shown to improve more than 5-fold.

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Section: Resultsmentioning

confidence: 99%

Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

Zhang

Wang

et al. 2017

ACS Catal.

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“…Their results indicated that the presence of EDTA in the reaction mixture reduced the photocatalytic oxidation rate of cyanide and the decrease was not proportional to the molar ratio of EDTA to cyanide. In our previous work on the oxidation of Cucyanide complexes by H 2 O 2 under alkaline conditions in the presence of EDTA/pyrophosphate, the results indicated that Cucyanide complexes oxidation was accelerated in the presence of EDTA or pyrophosphate [35]. The strong bonding of Cu(II) to EDTA suppressed decomposition of H 2 O 2 into O 2 and enhanced the effective utilization of H 2 O 2 for cyanide destruction.…”

Section: Individual Oxidation Of Cu-edtamentioning

confidence: 92%

Photoelectrocatalytic Oxidation of Cu-cyanides and Cu-EDTA at TiO2 nanotube electrode

Zhao

Zhang

2015

Electrochimica Acta

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A B S T R A C TOxidation of Cu-cyanides and Cu-EDTA complexes by a photoelectrocatalytic process was investigated at the TiO 2 nanotube matrix electrode. The results indicated that Cu oxides were deposited onto the TiO 2 nanotube anode in the individual oxidation of Cu-cyanide complexes with the conversion of CN À into OCN À . In the case of Cu-EDTA, Cu-EDTA was efficiently oxidized at the TiO 2 nanotube anode and liberated Cu 2+ was deposited onto the cathode with only little amount of Cu oxides deposited onto the TiO 2 nanotube anode. The above reactions favored at acid conditions. Furthermore, simultaneous oxidation of Cu-cyanide and Cu-EDTA was performed at the

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“…5 The Environmental Protection Agency (EPA) maintains stringent limits (0.1 mg/L) on the permissible level of cyanide concentrations in the effluent of industrial wastewater streams. 6 Various processes were conducted for cyanide removal from wastewater effluents including chemical oxidation, particularly chlorination oxidation, oxidation by hydrogen peroxide, [7][8][9] and oxidation by the acid of Caro. 10,11 In addition, photooxidation, 12,13 biological degradation, 12,14 electrochemical processes, 15 and adsorption [16][17][18][19][20][21][22][23][24][25][26][27][28][29] were proposed.…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of composite activated carbon from potato peel waste for cyanide removal from aqueous solution

Salman,

Rashid

2023

Env Prog and Sustain Energy

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This research presents a response surface methodology (RSM) with I‐optimal method of DESIGN EXPERT (version 13 Stat‐Ease) for optimization and analysis of the adsorption process of the cyanide from aqueous solution by activated carbon (AC) and composite activated carbon (CuO/AC) produced by pyro carbonic acid microwave using potato peel waste as raw material. Pyrophosphate 60% (wt) was used for impregnation with an impregnation ratio 3:1, impregnation time of 4 h at 25°C, radiant power of 700 W, and activation time of 20 min. Batch experiments were conducted to determine the removal efficiency of cyanide from aqueous solution to evaluate the influences of various experimental parameters such as contact time, cyanide concentration, initial pH, and dosage of adsorbent on cyanide removal efficiency. The statistical analysis showed that the quadratic model was significant. The model very low probability value (p‐value < 0.0001) for activated carbon and composite activated carbon, and the analysis of variance showed a high coefficient of specification values of adjusted R2 (model accuracy with observation) and predicted R2 (model accuracy without observation). The optimum conditions suggested by the model for the process variable were 160 min, pH = 10, 10 mg/L, 0.1 g/50 mL, for time, pH, concentration, activated carbon, and composite activated carbon dose, respectively. The maximum removal efficiency at these conditions was 98.2% for AC and 99.35% for CuO/AC. The equilibrium adsorption data obtained were analyzed by Langmuir and Freundlich isotherm models and results showed that it was better described by the Freundlich model. Likewise, the data of adsorption kinetic was analyzed using two models: pseudo‐first‐order and pseudo‐second‐order. The results showed that adsorption kinetics was well performed by the pseudo‐second‐order model.

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Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

Cited by 29 publications

References 36 publications

Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

Photoelectrocatalytic Oxidation of Cu-cyanides and Cu-EDTA at TiO2 nanotube electrode

Production and characterization of composite activated carbon from potato peel waste for cyanide removal from aqueous solution

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