Color Removal Rate Research Articles

QSAR model and microscopic mechanism analysis of dye removal by coagulation of aluminum chloride under alkaline conditions

Introduction: The inorganic coagulant AlCl3 is used in the traditional coagulation method for the decolorization of industrial dye wastewater. We studied its effectiveness in 41 kinds of dye with different structures, including azo, anthraquinone, arylmethane, and indigo dyes.Discussion: The optimal conditions for the removal of dye in the AlCl3 coagulation system were alkaline > neutral > acidic conditions. Under alkaline conditions, the hydrolysis colloid of AlCl3 is positively charged and easily combined with negatively charged anionic dyes by electrostatic adsorption. Therefore, the relationships between the dye removal behavior and molecular parameters under alkaline conditions were analyzed.Methods: Quantitative structure–activity relationship (QSAR) models were built for the color removal rates (Rexp) of 41 dyes and 46 molecular parameters computed by the density functional theory (DFT). Internal validation, external validation, statistical tests, Y-randomization, and applicability domain tests indicated that the optimal models are stable, accurate, reliable, and predictive.Results: The optimal QSAR model showed that surface area (approx.) (SAA) and molecular weight (MW) are two key molecular parameters. Moreover, electrostatic forces and hydrogen bonding are the predominant adsorption forces in this coagulation process.

Pulp and Papermill Effluent Treatment by Continuous Electrocoagulation

The continuous electrocoagulation (CEC) technique, which uses aluminium (Al) as an electrode material, is examined in this work for the treatment of highly toxic pulp and papermill effluents. The process optimization was done with respect to the flow rates (L h−1) and residence time (τ) of wastewater which resulted in the excellent removal of Total solids (TS), colour and Chemical Oxygen Demand (COD). The removal rate of COD was 94.4 and 93.1% at the optimal flow rates of 0.5 and 1.0 dm3 h−1, correspondingly, whereas the colour removal rate was 91.6 and 83.6%. There was gradual decrease in the pH of the effluent during the process due to the production of aluminium hydroxides in variable oxidation states. Variation in the cell voltage during the electrolysis has also been studied. TDS of effluent was also decreased by a factor of 93% after 4 h residence time at a flow rate of 0.5 dm3 h−1. With a variation in flow rates, electrode degradation and consumption were also examined.

DEGRADATION OF ORGANIC POLLUTANTS IN FLOCCULATED LIQUID DIGESTATE USING PHOTOCATALYTIC TITANATE NANOFIBERS: MECHANISM AND RESPONSE SURFACE OPTIMIZATION

<List> <ListItem> <ItemContent> ● Titanate NFs were synthesized and photodegraded liquid digestate for the first time. </ItemContent> </ListItem> <ListItem> <ItemContent> ● The long titanate NFs (bandgap of 3.16 eV) have a high VFA removal rate of 72.9%. </ItemContent> </ListItem> <ListItem> <ItemContent> ● RSM has been used to optimize the VFA, COD, and color removal rate. </ItemContent> </ListItem> <ListItem> <ItemContent> ● The quadratic model and the effects of photocatalytic dosage were significant. </ItemContent> </ListItem> </List> Titanate nanofibers (TNFs) were synthesized using a hydrothermal method and were employed for the first time in this study to photocatalytically degrade organic pollutants found in flocculated liquid digestate of poultry litter. The photocatalytic performance of TNFs, with a bandgap of 3.16 eV, was tested based on degradation of organic pollutants and removal of color. Five combinations of pollutant concentration and pH were examined (0.2 to 1.3 g·L⁻¹ at pH 4 to 10). Central composite design (CCD) and response surface methodology (RSM) were applied in order to optimize the removal rates of volatile fatty acids (VFA) and chemical oxygen demand (COD), and the decolorization rate. There were no significant differences between the regression models generated by the CCD/RSM and the experimental data. It was found that the optimal values for pH, dosage, VFA removal rate, COD removal rate and decolorization rate were 6.752, 0.767 g·L⁻¹, 72.9%, 59.1% and 66.8%, respectively. These findings indicates that photocatalytic TNFs have potential for the posttreatment of anaerobic digestion effluent, as well as other types of wastewater.

Variasi Sinar Ultraviolet terhadap Fluks untuk Pengolahan Air Gambut Sistem Membran Ultrafiltrasi

Abstract-Peat water treatment still has many obstacles, one of the alternatives that can be used to overcome this obstacle is membrane technology and UV light variais. This study aims to determine the effect of UV rays on the flux and content of BOD, TSS, pH, Turbidity, Color and E.Coli Bacteria. This study used a combined method, namely ultraviolet (UV) light poses using a UV Water Sterilizer, the filtration process using the KUF-3 ultrafiltration membrane and the phytoremediation method with kiambang plants. The results of this study showed the highest removal rate of BOD in the filtration process with UV 6 watts at 90 minutes of filtration time with an efficiency of 94.71%. The color removal rate in the filtration process with UV is 6 watts at 90 minutes of filtration time with an efficiency of 70.92%. Turbidity removal rate in the filtration process with UV 6 watts at 90 minutes filtration time with an efficiency of 99.97%%. The TSS removal rate in the filtration process with UV is 6 watts at 90 minutes of filtration time with an efficiency of 47.77%. The pH removal rate in the filtration process with UV is 6 watts at 90 minutes of filtration time with an efficiency of 24.79%. The elimination rate of E.coli bacteria in the filtration process with UV is 6 watts at 90 minutes of filtration time with 100% efficiency

The Utilization and Modeling of Photo‐Fenton Process as a Single Unit in Textile Wastewater Treatment

AbstractStudies on the direct application of the photo‐Fenton process (PFOP) to disinfect and decontaminate textile wastewater are rare. The output of the artificial neural network (ANN) models applied to the wastewater of a textile factory producing woven fabrics, which is used to assess the efficiency of the PFOP process, are investigated and compared with each other in this study. The highest PFOP efficiency is obtained at a pH of 3. Chemical oxygen demand (COD), suspended solids (SS) and color removal rates are 94%, 90%, and 96%, respectively. The data are modeled with ANNs and nonlinear external input autoregressive ANNs (NARX‐ANN) using the MATLAB R2020a software program. Both Levenberg–Marquardt (trainlm) and scaled conjugate gradient (trainscg) algorithms are employed in the ANN and NARX‐ANN models, whereas hyperbolic tangent sigmoid (Tansig) and logistic sigmoid (Logsig) functions are superimposed on the hidden layer in the ANN model, and Tansig functions are superimposed on the NARX‐ANN model. It is determined that the developed ANN models are more effective in estimating the PFOP efficiency. The mean squared error is 0.000 953, and the coefficient of determination (R2) is 0.96 661.

Quality Changes of Low-Density Polyethylene (LDPE) Recyclates from the Pretreatment Process with a Cationic Surfactant and a Nonionic Surfactant as Cleaning Agents Upstream of Extrusion

Low-density polyethylene is the most applied packaging plastic. The recycling rate of LDPE is low, especially for the material from the post-consumer source. The quality of the LDPE post-consumer recyclates is influenced by different contaminations, either intentionally or non-intentionally. Printing ink is one of the substances that is regarded as having a negative influence on the quality of LDPE recyclates. This study used a new type of nonionic surfactant oxirane, methyl-, polymer for de-inking as a pretreatment. Afterward, the LDPE film flakes were mechanically recycled in the laboratory. A melt flow index (MFI), differential scanning calorimetry (DSC), and tensile strength analysis were carried out. This work reported the de-inking effect of a new type of nonionic surfactant. However, no evidential correlation between the rate of color removal and the improvement in the rheological, thermal, and mechanical properties can be identified from the result of this study.

Decolorization mechanisms of reactive yellow 145 and ponceau S in microbial fuel cells during simultaneous electricity production

Environmental pollution is increasing in parallel with the increase in the world population. Azo dyes are one of the most important causes of environmental pollution. Microbial electrochemical cells are biotechnological systems that generate energy from renewable sources such as electricity. This study investigated simultaneous electricity generation with the decolorization of two different azo dyes in microbial fuel cells. And also, changes in pH values, chemical oxygen demand analysis, hourly color removal rate, dye spectral scanning were investigated. Reactive Yellow 145 dye with a concentration of 10 mg/L, 20 mg/L, and 40 mg/L, and Ponceau S dye with 20 mg/L and 40 mg/L concentration were tested in microbial fuel cells, respectively. Results indicate that the maximum voltage obtained was 0.11 V at the same time as the 100% decolorization rate in Reactive Yellow 145 and was achieved at a concentration of 10 mg/L also, the maximum voltage obtained was 0.24 V at the same time as the 100% decolorization rate in Ponceau S. It was achieved at a concentration of 20 mg/L. In conclusion, microbial fuel cells appear to be promising tools in treating textile azo dye wastewaters, and computational methods can be applied to estimate the degradation mechanisms of complex organic molecules found in wastewaters.

Photocatalysis process to treat polluted water by azo dye Cibacron Brilliant Yellow 3G-P.

The main objective of this study was to investigate the photodegradation of azo dye Cibacron Brilliant Yellow 3G-P using Anatase, Degussa-P25 and ZnO. These semi-conductors were characterized using XRD, BET and TEM-EDX. The variation of the amount of semi-conductors significantly affect the rate of color removal. The decolorization rate increased as the catalyst dosage was increased. Other parameters were also studied, such as stirring speed, pH, and initial dye concentration. It was found that the rate of decolorization increases with the increase of stirring speed. Decolorization of about 30, 60 and 80% was respectively achieved in the case of Anatase, Degussa-P25 and ZnO at low stirring speed (50rpm). At pH = 3, the degradation rate was found to be higher than the alkaline pH, about 95.58 and 85.71% of color has been decolorized with Anatase and Degussa-P25 respectively. While using ZnO, the color removal reached maximum in acidic and alkaline solutions, more than 95% of dye was decolorized. The concentrations dye solutions less than 80ppm led to the removal rate of about 95% in the case of ZnO, while it was only about 8-15% in the case of TiO2 with the concentration more than 20 ppm.

Treatment of membrane concentrated landfill leachate by a heterogeneous electro-Fenton process with an iron-loaded needle coke cathode

Mature membrane concentrated landfill leachate is one of the most recalcitrant wastewaters due to its high pollutant concentration, poor biodegradability, and stable organic structure. In this study, a heterogeneous electro-Fenton system was constructed using a Fe-loaded needle coke composite electrode as a cathode to treat the membrane concentrated landfill leachate from a local closed landfill. The reaction conditions were evaluated and optimized by the response surface method based on Box-Behnken design. A second-order polynomial model with COD removal rate as the response and initial pH, plate spacing, and applied voltage as independent variables were established. After treatment by the heterogeneous electro-Fenton process with the needle coke composite cathode under the optimal conditions of applied voltage 10 V, initial pH 3.6, and the plate spacing 1.4 cm, the COD and color removal rates of the membrane concentrate were up to 71.9% and 99.8%, respectively, and the biodegradability was significantly improved with the BOD5/COD increasing from 0.003 to 0.379. Various spectral analyses of the wastewater before and after electro-Fenton treatment with the needle coke composite cathode demonstrated that most of the macromolecular organic pollutants in the landfill leachate concentrate including aromatic compounds, simple aromatic protein compounds, soluble microbial by-products, and humic acid were significantly degraded. As a result, the electro-Fenton technique with the needle coke composite cathodes is one of the cost-effective options for treating membrane concentrated landfill leachate.

QSAR model and mechanism research on color removal efficiency of dying wastewater by FeCl3 coagulation

Coagulation is the most widely used method in the treatment of printing and dying wastewater. To better understand the relationship between the coagulation effect and dye molecular structures, quantitative structure activity relationship (QSAR) analyses were performed to elucidate the factors affecting the coagulation in ferric chloride (FeCl3) coagulation process. First, the coagulation experiments on 38 dye molecules were conducted to determine their color removal rates (Rexp) by FeCl3 under different pH conditions (i.e., pH = 4 and 10). The results showed that the average Rexp of dyes were 41.36% ± 2.40% at pH value of 4 and 55.70% ± 2.83% at pH value of 10. Subsequently, a multiple linear regression (MLR) method was used to construct QSAR models based on Rexp and 42 molecular parameters calculated by Gaussian 09, Materials Studio 7.0 and Multiwfn. The developed QSAR models exhibited excellent stability, reliability, and robustness with values of R2 = 0.7950, 0.8170, Q2INT = 0.6401, 0.7382, Q2EXT = 0.5168, 0.5441, at pH values of 4 and 10, respectively. Through analysis of quantum parameter values, electrostatic adsorption and hydrogen bonding adsorption were primarily responsible for the coagulation process. Therefore, this study could be useful in providing critical information for evaluating the removal efficiency and a feasible way to predict the removal rate of dyes by FeCl3 when no coagulation experiments were conducted.

Color removal from secondary treated pulp & paper industry effluent using waste driven Fe–TiO2 composite

In the present study, the concurrent fixed-bed dual technology (photocatalysis and photo-Fenton) was performed as a polishing step for the color removal of tertiary treated agro-based paper & pulp industry effluent. For this purpose, the cheap and visibly dynamic Fe–TiO2 composite was prepared using industrial waste materials which also promoted the idea of the circular economy. The effectiveness of the prepared composite and the dual process was evaluated in terms of color removal efficiency and rate constant along with optimizing the process factors. Various kinetic models namely Log-linear, Weibull, and Biphasic with shoulder were used for the comparative study of three different processes i.e. photocatalysis, photo-Fenton, and dual process. Several parameters such as pH (4.5), % surface area covered (100%), and H2O2 dose (525 mgL−1) were optimized which gave the best output using dual-process i.e. 91.6% of color reduction along with good R2 values i.e. 0.874, 0.981 and, 0.998 for Log-linear, Weibull and, Biphasic with Shoulder model respectively. The proposed composite was durable enough to retain its dual catalytic ability with minor activity reduction of 5–10% even after 50 recycles. Thus, this innovative technology with the dual effect of photocatalysis and photo-Fenton can be a potential bet as a tertiary treatment option in the existing industrial wastewater treatment system for removing color from the final treated effluent.

Leachate post treatment, using Ag-TiO2 nanoparticles immobilized on rotating vanes

The current study investigated the capability of Ag-TiO2 nanoparticles in photocatalytic landfill leachate post-treatment. Silver doped Titanium dioxide nanoparticles were coated on rotating vanes and used in an immobilized photoreactor for the first time. The system's efficiency in COD, color, turbidity, and TOC removal, was monitored, and the effect of different parameters including pH, coating surface area, and concentration of immobilized nanoparticles was investigated. Based on the results, the maximum COD, color, turbidity, and TOC removal rates were 62%, 66%, 53%, and 55%, respectively, after 4 h of irradiation under optimal conditions. Experimental data on COD removal were also compared with the first and second-order kinetic models and it was concluded that the degradation process is more compatible with the second-order model. Finally, vanes' durability was tested, and according to the results, each set of vanes was capable of being used for at least six consecutive cycles with a negligible decrease in the treatment efficiency. In comparison with pure TiO2, the synthesized Ag-TiO2 nanoparticles showed higher removal rates in equivalent time intervals, and the whole system proved to be a promising post-treatment approach.

Degradation of Azo Dyes with Different Functional Groups in Simulated Wastewater by Electrocoagulation

Increasing attention has been paid to the widespread contamination of azo dyes in water bodies globally. These chemicals can present high toxicity, possibly causing severe irritation of the respiratory tract and even carcinogenic effects. The present study focuses on the periodically reverse electrocoagulation (PREC) treatment of two typical azo dyes with different functional groups, involving methyl orange (MO) and alizarin yellow (AY), using Fe-Fe electrodes. Based upon the comparative analysis of three main parameters, including current intensity, pH, and electrolyte, the optimal color removal rates for MO and AY could be achieved at a rate of up to 98.7% and 98.6%, respectively, when the current intensity is set to 0.6 A, the pH is set at 6.0, and the electrolyte is selected as NaCl. An accurate predicted method of response surface methodology (RSM) was established to optimize the PREC process involving the three parameters above. The reaction time was the main influence for both azo dyes, while the condition of PREC treatment for AY simulated wastewater was time-saving and energy conserving. According to the further UV–Vis spectrophotometry analysis throughout the procedure of the PREC process, the removal efficiency for AY was better than that of MO, potentially because hydroxyl groups might donate electrons to iron flocs or electrolyze out hydroxyl free radicals. The present study revealed that the functional groups might pose a vital influence on the removal efficiencies of the PREC treatment for those two azo dyes.

Evaluation of magnetic poly(methyl methacrylate) microspheres as catalysts in heterogeneous Fenton processes

This work reports the preparation of magnetic polymeric microspheres based on poly(methyl methacrylate) and the investigation of these materials as catalysts in heterogeneous Fenton processes for the decolorization of methyl orange (MO). The microspheres were prepared by polymerization of the magnetic material together with the monomers by aqueous suspension polymerization. The microspheres had specific surface area of 48.2 m2 g-1. Mossbauer data indicated that the magnetic material was a mixture of magnetite (31%), maghemite (21%), and goethite (48%). Fenton reactions were performed by varying the concentration of H2O2, pH, composite mass, and contact time. The highest color removal rates (around 80%) were reached at pH 3.0, 20% w/v of composite, 20 minutes contact time, and 10 ppm of H2O2. The composite could be reused during four cycles with removal efficiency above 50%. The results indicated that the adsorption and oxidation mechanisms act together determining the variation of the MO dye removal.

Fabrication of Polyethersulfone (PES) Membrane Incorporated with Graphitic Carbon Nitride (g-C3N4) Nanoparticles in Palm Oil Mill Effluent (POME) Wastewater Treatment

Backed by the evolution in the nanotechnology field, membrane modified with nanoparticles as an additive has become increasingly prominent nowadays. The enormous potential of graphitic carbon nitride (g-C3N4) photocatalyst in wastewater treatment has been disclosed extensively. In this study, 4 Polyethersulfone (PES) membranes with different concentration of g-C3N4nanoparticles as additive were fabricated and their performances were investigated. Scanning Electron Microscopy (SEM) analysis showed that the membrane top surface layer was getting denser with the higher g-C3N4nanoparticles concentration which subsequently decreased the membrane mean pore size, porosity and flux. However the membrane with higher additive concentration was demonstrated a better improvement in anti-fouling properties where the flux recovery ratio (FRR) of the membranes showed an uptrend movement from 23.43% (membrane without additive) to 64.64% (membrane with 6 wt.% of additive). The enhancement of COD and colour removal rate from 61.50 % to 66.50 % and 78.75 % to 83.75 % was also observed in this study where the finding has signified the increased g-C3N4 nanoparticles concentration was constructive in PES membrane modification.

A triethanolamine-assisted fabrication of stable Sb doped-SnO2/Ti electrode for electrocatalytic oxidation of rhodamine B

A stable Sb doped SnO2/Ti electrode was successfully fabricated via a triethanolamine-assisted method and used as an anode to degrade Rodanmine B under the acid condition in electrocatalytic oxidation process. The surface of the fabricated Sb-SnO2/Ti was covered 200 nm broccoli-like microsphere mainly composed of Sn element and O element. It was found that the Sb-SnO2/Ti electrode was not changed obviously by the comparison of XRD, XPS, FT-IR, Raman spectrum, and DRUV-Vis before and after reaction. The electrochemical oxidation performance was investigated using Rhodamine B (43.8 mg/L) under the acid solution (pH = 2.0). After 30 cycle tests, the Sb-SnO2/Ti electrode has still a high electrocatalytic activity, and the removal rate of color was over 83%. The CV curve discovered there were three unchanged oxidations peaks at −0.675 V, −0.245 V, and 0.475 V, indicating that the degradation path was consistent during the electrochemical reaction. Moreover, high-contained RhB solution (438 mg/L) was degraded at 10.0 V applied voltage, and the removal rate (CODCr) was over 87% after 270 min. The reaction order was a quasi-second-order kinetics based on the CODCr values in the electrocatalysis system. The i-t curve disclosed that the fabricated Sb-SnO2/Ti electrode was very stable. All experimental data identified that the prepared electrode was high-activate and stable reasonably, which could be used as an anode for the elimination of organic pollutant in wastewater.

Photo-assisted degradation of organic pollutant by CuFeS2 powder in RGB-LED reactors: A comprehensive study of band gap values and the relation between wavelength and electron-hole recombination

This work investigated the relation between direct band-gap conversion and excitation wavelength towards catalysis efficiency in red, green, and blue (RGB) light-emitting diode (LED) reactors. An integrating sphere and spectroradiometer system obtained the emission wavelengths of the operating modes spectra of the RGB-LED reactors. The effects of pH, catalyst, and H2O2 dosage were investigated, and the optimal photocatalysis conditions were found to be at pH 3, catalyst loading of 0.25 g L−1, 0.25 mmol L−1 of H2O2(aq) (30% v/v) for an initial model pollutant concentration of 75 mg L−1 and reaction time of 60 min. Under the higher intensity red mode (R1), the highest color removal rate was reached (88.1%), while in the conventional white light mode (WL), the decolorization efficiency remained 64.3%. Furthermore, the R1 mode showed a superior TOC removal than the WL mode, reaching the final removal efficiencies of 91.86% and 61.06%, respectively. Contrary to what has been reported, as the dominant wavelength of the irradiation source decreased, the efficiency also tended to decrease. The electron-hole recombination increased as the irradiation mode decreased, and a work function (φ) representing this phenomenon was obtained by the deduction of the relation between energy (E) and frequency (f) of the photons involved. Therefore, the insights presented in this work are valuable tools in increasing LED photocatalysis efficiency.

Evaluation of color removal efficiencies and kinetic parameters of Fenton (H2O2/Fe2+) and photo-Fenton (H2O2/Fe2+/UV) processes in the treatment of a textile wastewater containing indigo blue / Avaliação da eficiência de remoção de cor e parâmetros cinéticos dos processos de Fenton (H2O2/Fe2+) e foto-Fenton (H2O2/Fe2+/UV) no tratamento de um efluente têxtil contendo corante azul índigo

The textile industry uses Indigo blue dye extensively in the production of jeans. Thus, high volumes of wastewater containing dye are obtained and must be treated before being discharged. The color removal efficiencies of indigo blue dye synthetic wastewater after treatment by Advanced Oxidative Processes (AOPs) using Fenton (H2O2/Fe2+) and photo-Fenton (H2O2/Fe2+/UV) was evaluated in this work. The experiments were conducted at pH 2.8 and evaluated the influence of the amount of [H2O2]/[Fe2+], the use of sulfuric acid and citric acid to adjust the pH, the initial concentration of the indigo dye, and the dosage form of H2O2 - the kinetic parameters and BMG model were also evaluated. The use of sulfuric acid to adjust the pH was more efficient in removing the color. The highest color removal rates were 70.78 ± 2.96 % after 180 min and 64.22 ± 2.08 % after 60 min, respectively, for the Fenton and photo-Fenton processes (both with a single dose of reagents) and 79.76 ± 1.45 % after 300 min and 80.43 ± 1.27% after 180 min, respectively, for Fenton and photo-Fenton with the gradual addition of H2O2. The indigo dye degradation reactions are better suited to the BMG kinetic model.

Effective leachate treatment by a pilot-scale submerged electro-membrane bioreactor.

Most landfill leachates contain organic compounds that cannot be easily separated by conventional biological processes. Recently, integration of membrane bioreactors and electro-oxidation has been proposed as a suitable option for the treatment and separation of organic and inorganic contaminants in leachate. Therefore, in the present study, the performance of submerged electro-membrane bioreactor (SEMBR) along with a conventional membrane bioreactor (MBR) on a pilot scale was evaluated for the treatment of leachate. Both bioreactors were used to compare treatment efficiency under the same conditions. The removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), phosphate (PO43--P), color, UV254, and metals were investigated. The results showed that applying electric current to the MBR could approximately increase the COD removal efficiency from 94 to 98.5%; PO43--P removal from 70 to 99%; NH3+-N removal from 91 to 99%; UV254 removal from 80 to 96%; and heavy metals removal from 40 to 95%. Humic acid removal efficiency as another indicator of humic substances was increased from 75% in the MBR to 96% in the SEMBR process. The results also showed that the effluent can be introduced into the wastewater treatment plant for further treatment. The SEMBR process achieved a minimization of fouling of membranes compared to conventional MBR. The consumption of the energy and electrode was in accordance with the previous results, and the required energy of 1.57 kWh/m3 of wastewater was calculated. The sludge volume index (SVI) in SEMBR (105 ml/g) was better than MBR (135 ml/g) due to the electrokinetic effect on the production of denser flocs. Based on the results, it can be concluded that the application of electric current can improve the performance of MBR in removing PO43-, NH4+, and membrane fouling.

Co/Fe co-doped porous graphite carbon derived from metal organic framework for microelectrolysis-Fenton catalytic degradation of Rhodamine B

Co/Fe co-doped porous graphite carbon (Co/Fe-PGC) nanocomposites were successfully prepared by one-step pyrolysis with CoFe-MOF, in which the Co/Fe nanoparticles were uniformly coated on porous graphite carbon derived from MOF. It was used to microelectrolysis-Fenton degrade rhodamine B through the main active substance ∙OH. The color and TOC removal rate of 100 mg/L rhodamine B reached 99.41% and 64.6%, respectively, for 30 min. Rhodamine B was degraded into small molecular organic acids, alcohols and lipids by N-demethylation and chromophore cleavage, until it was finally degraded into CO2 and H2O, and no new colored organics were produced in the degradation process. The degradation process follows the first-order reaction kinetics, and its rate constant is much higher than that of the previous similar studies. The excellent catalytic performance of Co/Fe-PGC catalyst is attributed to the coupling effect of micro-electrolysis and Fenton reaction, and the acceleration of cobalt on electron transport and Fe2+ reduction. Co0/Fe0 undergoes galvanic corrosion to generate Co2+/Fe2+ and H2O2, and then these products undergo Fenton reaction to generate Co3+/Fe3+ and ∙OH, thus forming a circulating system of Co3+/Fe3+ and Co2+/Fe2+, enhancing the activation of H2O2 and ensuring the efficient degradation of RhB.