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Electrochemical polymerization of aniline was carried on platinum (Pt) wire electrode in sulfuric acid (H2SO4) solution by cyclic voltammetry using a conventional three-electrode cell at room temperature (20°C). The effects on the electrodeposition of the monomer concentration, anodic potential and potential scan rate are discussed. The conductive layer of emeraldine base polyaniline (Pani) was prepared in this work by repeating potential cycling between -0.24 and 0.9 V/SCE at 50 mV/s in 1 M H2SO4 solution containing 0.1 M aniline monomer.

Phthalocyanine dyes are one of the major categories of reactive dyes. They are water-soluble metal complexes, mainly containing copper, that are resistant to bacterial degradation under aеrobic and anaerobic conditions. In this review article, the authors present the removal of RB21 phthalocyanine dye in aqueous solution by adsorption based on the literature. Therefore, an exhaustive list of various adsorbents has been compiled here. Additionally, the performance of several adsorbents under different physico-chemical process parameters and their comparative adsorption capacity towards the adsorption of RB21 dye was also presented. Affective adsorption factors for the dye such as solution pH, initial dye concentration, adsorbent dosage and temperature are also included.

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