In this study, the electrocatalytic synergy of the graphite/β-PbO2 anode and granular activated carbon (GAC) particles electrodes for bisphenol A (BPA) degradation are investigated in a three-dimensional electrochemical reactor (3DER). The graphite/β-PbO2 anode was prepared by anodic deposition method and the electrocatalytic properties of lead oxide film were studied by FESEM, XRD, EDX-mapping, linear sweep voltammetry and accelerated lifetime test techniques. The effect of five independent variables including pH, Na2SO4 concentration, current density, GAC amount, and reaction time on the system response was optimized by an orthogonal central composite-genetic algorithm (OCCD-GA). The results showed that β-PbO2 crystals were deposited as completely compact pyramidal clusters on the graphite surface. In addition, the service life and oxygen evolution potential (OEP) for the electrocatalytic layer of β-PbO2 were 90 h and 2 V, respectively. Based on the developed quadratic model (R2 > 0.99 and p-value

Enhanced electrocatalytic degradation of bisphenol A by graphite/β-PbO2 anode in a three-dimensional electrochemical reactor

The electrochemical advanced oxidation processes (EAOPs) have received significant attention among the many other water and wastewater treatment technologies. However, achieving a desirable removal effect with a single technique is frequently difficult. Therefore, the integration of ultrasound technique with other processes such as electrocoagulation, electro-Fenton, and electrooxidation is a critical way to achieve effective organic pollutants decomposition from wastewater. This review paper is focused on ultrasound-assisted electrochemical (US/electrochemical) processes, so-called sonoelectrochemical processes of various organic pollutants. Emphasis was given to recently published articles for discussing the results and trends in this research area. The use of ultrasound and integration with electrochemical processes has a synergistic impact owing to the physical and chemical consequences of cavitation, resulting in enhancing the mineralization of organic pollutants. Various types of sonoelectrochemical reactors (batch and continuous) employed in the US/electrochemical processes were reviewed. In addition, the strategies to avoid passivation, enhanced generation of reactive oxygen species, and mixing effect are reviewed. Finally, concluding remarks and future perspectives on this research topic are also explored and recommended. 

Recent progress on ultrasound-assisted electrochemical processes: A review on mechanism, reactor strategies, and applications for wastewater treatment

Recent progress on ultrasound-assisted electrochemical processes: A review on mechanism, reactor strategies, and applications for wastewater treatment.

In the present paper, the Response Surface Methodology (RSM) was evaluated for optimizing the Hexavalent Chromium (Cr (VI)) removal efficiency using our synthesized adsorbent, i.e., Fe3O4-NPs loaded on activated carbon (AC-Fe3O4-NPs). For studying the characteristics of synthesized catalyst, the different analyses, e.g., pHpzc, XRD, FE-SEM, and VSM was utilized. As detected in results, a suitable correlation could be perceived between the values obtained by experiments and the values predicted by the quadratic model (P 0.99). The experimentally obtained maximum adsorption capacity of AC-Fe3O4-NPs for Cr (VI) adsorption was estimated to be 15.24 mg/g.

Application of Box–Behnken design for optimizing parameters of hexavalent chromium removal from aqueous solutions using Fe3O4 loaded on activated carbon prepared from alga: Kinetics and equilibrium study

Application of a fluidized three-dimensional electrochemical reactor with Ti/SnO2-Sb/β-PbO2 anode and granular activated carbon particles for degradation and mineralization of 2,4-dichlorophenol: Process optimization and degradation pathway.

The efficacy of sono-electro-Fenton process for removal of Cefixime antibiotic from aqueous solutions by response surface methodology (RSM) and evaluation of toxicity of effluent by microorganisms

Abstract Textile industries use large amounts of water and chemicals for finishing and dying processes. The chemical structures of dyes vary enormously, and some have complicated aromatic structures that resist degradation in conventional wastewater treatment processes because of their stability to sunlight, oxidizing agents, and microorganisms. The objective of this research is to compare the adsorption efficiency of two types of magnetic activated carbons derived from Banana peel and Salvia seed for the removal of basic blue 41 dye. The faculty of the produced activated carbons to remove basic blue 41 dye from aqueous solutions via batch adsorption has been examined under several operating conditions such as pH, adsorbent dose, initial adsorbate concentration and contact time. The cheap, non-toxic produced activated carbons (AC) were characterized by scanning electron microscope and Brunauer-Emmett-Teller analyses. The best conditions of dye adsorption with BPAC@ Fe 3 O 4 equal to pH = 9, AC dose 0.5 g/L , dye concentration 50 mg/L and equilibrium contact time 30 min, optimal dye adsorption conditions for SSAC@Fe 3 O 4 equal to pH = 9, adsorbent dose 0.75 mg/L , dye concentration 50 mg/L and equilibrium contact time is 30 min. This study followed the Langmuir isotherm model well with regression coefficient of R 2 = 0.9886 for BPAC@Fe 3 O 4 and regression coefficient of R 2 = 0.9764 for SSAC@Fe 3 O 4 . 

/pdf/synthesis-of-magnetic-fe3o4-activated-carbon-prepared-from-cs3v1x7d.pdf

Synthesis of magnetic Fe3O4/activated carbon prepared from banana peel (BPAC@Fe3O4) and salvia seed (SSAC@Fe3O4) and applications in the adsorption of Basic Blue 41 textile dye from aqueous solutions

Abstract The environment is threatened by a diversity of pollutants, and synthetic dyes are considered a foremost environmental pollutant among them. The characteristics detected for the dye, e.g., toxicity and carcinogenicity, have brought severe problems for humans and aquatic organisms. The present study was done to clarify the potential of activated carbon made from cherry tree wood (CWAC) in the adsorption of cationic red 14 dye. In our experimental-laboratory study, the changes in removal efficiency were assessed by considering the changes in values of pH, concentration, adsorbent dose, contact time, and temperature. In addition, the nature of our prepared adsorbent was defined based on scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and Fourier-transformed infrared (FTIR) spectroscopy techniques. The concentration of dye after the completion of experiments was recorded using a spectrophotometer at 514 nm. Evaluating the attained data by isotherm and kinetic models were also considered. Our results demonstrated the enhancement in the efficiency of the studied process at higher contact times, temperatures, and pH and its decline at higher initial dye concentrations. pH = 11, time of 45 min, dye concentration of 50 mg/L, and AC mass of 0.25 g/l were optimal values in obtaining the highest removal of the studied dye. Langmuir isotherm and pseudo-second-order (PSO) with ( R 2 = 0.9972) and ( R 2 = 0.9947) were the best isotherms and kinetic models in the description of the observed data, respectively. Considering the results, CWAC could be effectively utilized for the adsorption of cationic red 14 dye from solutions. 

https://doi.org/10.1007/s13201-023-01899-1

Synthesis of activated carbon from cherry tree waste and its application in removing cationic red 14 dye from aqueous environments

Background & objectives : Dyes are structurally complex materials, which enter into the environment due to discharging of textiles effluent from dyeing and printing processes. Reactive Blue 52 dye is used widely in the textile industry. Therefore, we investigated the efficiency of the filamentous Alga as natural adsorbent in the removal of Reactive Blue 52 dye from textile wastewater. Methods: This experimental study was performed in laboratory scale. In this study, the effect of adsorbent dose, contact time, pH and different dye concentrations on efficiency of adsorption process were studied and finally, fitting rate of data for Langmuir and Freundlich isotherms and also pseudo-first-order and pseudo-second-order adsorption kinetics were determined. For analysis of the data, linear regression and R-squared were used. Results: According to the obtained results, increasing of adsorbent dose to 22 g/100 mL in concentrations of 50 mg/L RB52 led to an increase of removal efficiency to 58.04%. Adsorption capacity was increased from 31.2 to 8.41 %, by increasing the initial pH from 3 to 11 for concentrations of 10 and 25 mg/L, respectively. Results showed that with the increase of contact time, removal efficiency increased and with increasing of initial dye concentration, the removal efficiency decreased. Langmuir isotherm was in good concordance with the data. The model of pseudo-second-order kinetic demonstrated better fitting with the experimental data. Conclusion: The results indicated the suitability of filamentous Alga as natural adsorbent for color removal.

http://healthjournal.arums.ac.ir/files/site1/user_files_902ca9/mohamadkian-A-10-608-212-ae0f6b8.pdf

Eco-friendly Biosorption Process of Reactive Blue 52 Dye Using Alga Dried Biosorbent of Filamentous Alga Species: Equilibrium, Kinetic Studies and Intervening Effect

Amir Moharrami

Papers

The efficacy of sono-electro-Fenton process for removal of Cefixime antibiotic from aqueous solutions by response surface methodology (RSM) and evaluation of toxicity of effluent by microorganisms

Synthesis of magnetic Fe3O4/activated carbon prepared from banana peel (BPAC@Fe3O4) and salvia seed (SSAC@Fe3O4) and applications in the adsorption of Basic Blue 41 textile dye from aqueous solutions

Synthesis of activated carbon from cherry tree waste and its application in removing cationic red 14 dye from aqueous environments

Eco-friendly Biosorption Process of Reactive Blue 52 Dye Using Alga Dried Biosorbent of Filamentous Alga Species: Equilibrium, Kinetic Studies and Intervening Effect