Photo-catalytic Removal of Methyl Orange Dye by Polyaniline Modified ZnO using Visible Radiation

Abstract

Article InformationPolyaniline modified zinc oxide (PANI/ZnO) nanocomposite was synthesized by in-situ polymerization process. The as-synthesized nano-ZnO, PANI and PANI/ZnO nanocomposite were characterized by X-ray diffraction (XRD), FT-IR, and UV-Vis spectroscopy. The UV-visible spectroscopy studies showed that the absorption peak for PANI/ZnO nanocomposite has a red shift toward visible wavelengths compared with the ZnO nanoparticles and PANI. Photocatalytic efficiency of PANI/ZnO nanocomposite was investigated for the degradation of methyl orange (MeO) dye as a model organic compound under Visible light irradiation. The photocatalytic activities of ZnO, PANI and PANI/ZnO nanocomposite were studied. The results showed that ZnO/PANI nanocomposite had greater photocatalytic activity than ZnO nanoparticles and PANI under visible light irradiation. According to these results, application of PANI as a shell on the surface of ZnO nanoparticles causes the enhanced photocatalytic activity of the PANI/ZnO nanocomposite. Influence of some operational parameters such as: amount of photocatalyst, pH of solution, and MeO dye initial concentration on the photodegradation reaction rate was investigated.The optimum values of pH and catalyst dose found to be 6 and 1.50 gmL -1 respectively. It was demonstrated that the photocatalytic degradation of MeO follows pseudo first-order kinetics. The PANI/ZnO nanocomposite photocatalysts have good photocatalytic stability and can be reused three times with only gradual loss of activity. Thus, the PANI/ZnO nanocomposites are efficient photocatalytic materials for degrading contaminated colored wastewater for reuse in textile industries under mild conditions.

Bio-approach: Plant mediated synthesis of ZnO nanoparticles and their catalytic reduction of methylene blue and antimicrobial activity

“…Recently, photo catalytic reactions induced by illumination of 60 semiconductors in suspension have been shown to be one of the 61 most promising processes of the wastewater treatment for its 62 advantages over the traditional techniques. They provide an inter- 63 face with an aqueous medium and induce an advanced oxidation 64 process (AOPs), no formation of polycyclic products and oxidation 65 of pollutants in the ppb range [3]. Many different semiconductor 66 materials, such as TiO 2 , ZnO, ZrO 2 , SrO 2 , Fe 2 O 3 , CdS and ZnS have 67 been used to photo-degrade different pollutants.…”

Degradation of cationic and anionic dyes in coagulation–flocculation process using bi-functionalized silica hybrid with aluminum-ferric as auxiliary agent

“…Besides, the photocatalysis process of methyl orange is reported at 81.3% at pH 6 using polyaniline modied zinc oxide (PANI/ZnO) in 2 hours. 38 Fig. 12 TGA and DTA of sludge.…”

Fabrication of Zinc Oxide-Polyaniline Composite on Kapok Paper for Methylene Blue Dye Removal in Aqueous Solution

“…Furthermore, PANI ES has been widely used as an adsorbent of anionic dyes such as methyl orange, rhodamine B, etc. due to its complementing bonding with the cationic backbone [6,7]. In this study, we explore the possibility of using PANI in removing cationic dyes by deprotonation using sodium hydroxide (NaOH) treatment.…”