Photo-assisted electrochemical abatement of trifluralin using a cathode containing a C₆₀-carbon nanotubes composite

Hasanzadeh, Aliyeh,Khataee, Alireza,Zarei, Mahmoud,Joo, Sang Woo Elsevier 2018 CHEMOSPHERE - Vol.199 No.-

<P><B>Abstract</B></P> <P>This work reports the potential application of modified gas-diffusion electrode (GDE) with C<SUB>60</SUB>-CNT composite, as a stable and efficient cathode material for degradation of trifluralin (TRL) pesticide by photo-assisted electrochemical (PE) process. C<SUB>60</SUB>-CNT composite was prepared and characterized. Subsequently, a novel C<SUB>60</SUB>-CNT composite modified GDE cathode was developed and the electrochemical and physical characteristics of the modified GDEs were studied. C<SUB>60</SUB>-CNT composite/GDE showed great efficiencies for electro-generating H<SUB>2</SUB>O<SUB>2</SUB>, owing to huge surface area and high conductivity. Afterwards, a comparative study of TRL oxidation via photolysis, anodic oxidation (AO) and PE processes using C<SUB>60</SUB>-CNT composite/GDE revealed the degradation percentages of 42.2, 48.5 and 93.4%, respectively, after 180 min of treatment. The TRL degradation followed a pseudo-first-order kinetics, being faster in the order: photolysis < AO < PE. The effects of various operational conditions were assessed on the degradation of TRL. From the results, PE process using C<SUB>60</SUB>-CNT composite/GDE exhibited great performance for the degradation of TRL (20 mg L<SUP>−1</SUP>) under its original pH, Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte concentration of 0.05 mol L<SUP>−1</SUP>, applied current intensity of 300 mA, and flow rate of 12.5 L h<SUP>−1</SUP>. TOC results displayed that 92.8% of TRL was mineralized after 8 h of PE process. In addition, a plausible pathway for mineralization of TRL was proposed according to the identified by-products detected by means of gas chromatography–mass spectroscopy (GC–MS), High-performance liquid chromatography (HPLC) and ion chromatography analyses.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of C<SUB>60</SUB>-CNTs hybrid with covalently attached C<SUB>60</SUB> onto outer surface of CNTs. </LI> <LI> Modification of gas-diffusion electrode with C<SUB>60</SUB>-CNTs hybrid for H<SUB>2</SUB>O<SUB>2</SUB> electro-generation. </LI> <LI> Achievement of the highest value of H<SUB>2</SUB>O<SUB>2</SUB> electro-generation by C<SUB>60</SUB>-CNTs hybrid/GDE. </LI> <LI> High degradation efficiency of trifluralin using C<SUB>60</SUB>-CNTs hybrid/GDE in PE process. </LI> <LI> Offer the degradation pathway of trifluralin by photoassisted electrochemical process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Kinetic modeling of sonocatalytic performance of Gd-doped CdSe nanoparticles for degradation of Acid Blue 5

Khataee, Alireza,Karimi, Atefeh,Hasanzadeh, Aliyeh,Joo, Sang Woo Elsevier 2017 Ultrasonics sonochemistry Vol.39 No.-

<P><B>Abstract</B></P> <P>CdSe and Gd-doped CdSe nanoparticles were synthesized using a simple hydrothermal method, and their catalytic activity was examined toward degradation of Acid Blue 5 (AB5) in the sonocatalytic process. The structure and morphology of as-prepared nanomaterials were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Branauer, Emmett and Teller (BET) and Fourier infrared spectroscopy (FT-IR) techniques. Among the synthesized samples, 4% Gd-doped CdSe nanoparticles demonstrated the highest catalytic activity with band gap energy of 1.61eV. The effect of dopant content, initial dye concentration, catalyst dosage, ultrasonic power and inorganic radical scavengers on the degradation efficacy of AB5 was evaluated. The produced intermediates of AB5 degradation during sonocatalytic process were verified using gas chromatography–mass spectroscopy (GC–MS) technique. A novel intrinsic kinetic model for prediction of AB5 degradation efficiency was proposed. A good agreement was obtained between developed model and experimental data (R<SUP>2</SUP> >0.94).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of CdSe and Gd-doped CdSe nanoparticles via hydrothermal method. </LI> <LI> Sonocatalytic degradation of AB5 using Gd-doped CdSe nanoparticles. </LI> <LI> Development of a novel intrinsic kinetic model for prediction of AB5 degradation efficiency. </LI> <LI> Determination of intermediates to propose a possible dye degradation pathway. </LI> </UL> </P>

Synthesis of magnetically reusable Fe3O4 nanospheres-N, S co-doped graphene quantum dots enclosed CdSe its application as a photocatalyst

Alireza Khataee,Saeed Sajjadi,Aliyeh Hasanzadeh,주상우 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-

Herein, Fe3O4 nanospheres attached on N, S co-doped graphene quantum dots (NSG) enclosed CdSenanoparticles (CdSe/NSG–Fe3O4) is introduced as a magnetic high-performance photocatalyst for theheterogeneous photodegradation of methylene blue in aqueous solutions. The as-prepared CdSe/NSG–Fe3O4 nanocatalyst showed high stability and adequate ferromagnetism which makes it easy to beseparated and reused. CdSe/NSG–Fe3O4 nanocomposites displayed enhanced photocatalytic activity forthe degradation of organic compounds such as azo-dyes compared with CdSe nanoparticles. In view ofthese advantages offered by the prepared nanocatalyst, it has a high potential for the degradation oforganic contaminants.

A comparative study on electrogeneration of hydrogen peroxide through oxygen reduction over various plasma-treated graphite electrodes

Khataee, Alireza,Sajjadi, Saeed,Pouran, Shima Rahim,Hasanzadeh, Aliyeh,Joo, Sang Woo Elsevier 2017 ELECTROCHIMICA ACTA Vol.244 No.-

<P><B>Abstract</B></P> <P>The present study reports a simple modified method that enhanced the surface characteristics of graphite electrode towards greater hydrogen peroxide production. In this method, the plasmas of various gases vis. air, argon and nitrogen were used in alternating current glow discharge plasma (AC-GDP) technique to treat graphite surface. The morphology, microstructure, roughness, disorder degree, surface chemical composition and carbon state of the graphite samples were determined before and after plasma treatments. The formation of 3D nanostructures and enhancement in surface characteristics resulted in effective H<SUB>2</SUB>O<SUB>2</SUB> generation over the plasma-treated electrodes. Particularly, air plasma-treated electrode showed higher efficiencies by producing 119μmol/L H<SUB>2</SUB>O<SUB>2</SUB>, owing to etching effect of oxygen-content and improved wettability. Furthermore, the pH, applied current and electrolyte concentration had distinct effects on the H<SUB>2</SUB>O<SUB>2</SUB> yield. The results indicated that AC-GDP using air plasma can be a promising technique for developing high efficient graphite electrodes for facile electro-generation of hydrogen peroxide.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Air, Ar and N<SUB>2</SUB> gases were used in alternating current glow discharge plasma method. </LI> <LI> The employed plasmas resulted in 3D nanostructured-surface of graphite electrodes. </LI> <LI> The plasma-treated electrodes gave rise to greater H<SUB>2</SUB>O<SUB>2</SUB> electro-production. </LI> <LI> Air-GDP was the most effective. owing to etching effect of the oxygen-content. </LI> <LI> pH, current and electrolyte concentration had distinct effects on accumulated H<SUB>2</SUB>O<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic illustration of the preparation of nanostructured graphite samples by treatment under air, N<SUB>2</SUB> and Ar plasmas.</P> <P>[DISPLAY OMISSION]</P>

Efficient electrochemical generation of hydrogen peroxide by means of plasma-treated graphite electrode and activation in electro-Fenton

Alireza Khataee,Saeed Sajjadi,Shima Rahim Pouran,Aliyeh Hasanzadeh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-

Herein, air, argon, nitrogen and oxygen plasmas were used in glow discharge plasma under alternativecurrent to enhance the surface properties of graphite. The plasma-treated graphite electrodes (PTGE)were used as cathode in electro-Fenton (EF) for Acid Orange 7 (AO7) degradation. O2-PTGE exhibited thebest activity owing to its improved surface characteristics. Later, the effects of the main operationalcondition on O2-PTGE efficacy in EF and the stability of O2-PTGE were evaluated and degradationintermediates were identified. Finally, the performance of the studied system was assessed inheterogeneous condition using martite as catalyst and compared with homogeneous system.