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In the last decades, corrosion control of metals and their alloys has been of environmental, aesthetic, economic, and technical importance. Ecologically acceptable, environment-friendly, and readily available corrosion inhibitors are one of the best options for protecting metals against corrosion. In this regard, use of polymers for inhibiting metallic corrosion is an authentic and acceptable practice, with a low environmental threat. Polymers may be used as composites, blends, or isolation for optimal inhibitory effects. Inhibition efficiencies of corrosion inhibitors were determined using mass loss, electrochemical impedance spectroscopy, potentiodynamic polarization techniques, etc. The present study gives the idea about natural, synthetic, and conducting polymers and their utilization for corrosion inhibition applications. Effects of halide ions as additives or surfactants on their anticorrosion performances are also discussed. Polymeric materials as coatings are reviewed to align with recent research interests, such as cost-effectiveness, environment friendliness, and self-healing products, which are more convenient to synthesize and use in future applications.

Corrosion is distruction of the metal surface due to the interaction with its environment. It is due to the exposure of the metal with a gas and a fluid and it turns into a significant issue as it causes enormous monetary misfortune. To overcome risky and hazardous corrosion effect, a specialists and researchers proposed some technique to control corrosion such as utilization of chemicals as corrosion inhibitors, surface coatings, cathodic and anodic protection, adjust destructive climate etc. Among all one of the very important technique is to use corrosion inhibitor in industrial pickling process. Most of the corrosion inhibitor are having toxic behaviour and to overcome that natural inhibitors like plant extract and low toxic materials like terminated medications can be used to follow the principles of the environmental safety and sustainability. Writing survey uncover those different sorts of medications (Antibacterial, Antifungal, Antibiotic, Anti-malarial, Analgesic, Anti-depressant, Anti-hypertensive, Antihistamine) have been viably energetic as plausible inhibitors for diminishing the impact of consumption on metals and compounds. The up-and-coming segments convey complete outline of the utilization of medications and green consumption inhibitors and the writing on their corrosion restraint considers.

In the present work, photocatalytic degradation of methylene blue has been carried out using naïve titanium dioxide, nano-sized titanium dioxide and H2O2 under visible light. The catalysts, naïve and nano-sized titanium dioxide were prepared by the sol–gel method. Characterization of synthesized catalysts has been done by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–Visible spectroscopy. The rate of degradation of dye was monitored spectrophotometrically by measuring absorbance of dye at regular time intervals. The effect of various parameters such as pH, concentration of dye, amount of catalyst, amount of H2O2 and light intensity on the rate of reaction has been studied. Various parameters like chemical oxygen demand (COD), conductance, pH, TDS, salinity and dissolved oxygen (DO) for the reaction mixture have also been determined. A tentative mechanism for degradation of dye has been proposed involving ·−OH radical as an oxidant. The participation of ·−OH radical has been confirmed by using 2-propanol (scavenger) as the rate of reaction was drastically reduced in its presence.

In the present work, photo-Fenton degradation of Sunset Yellow FCF under visible light was carried out by using copper loaded bentonite and hydrogen peroxide. The photocatalyst was prepared by loading copper ions on bentonite by wet impregnation method. The rate of photocatalytic degradation of dye was measured spectrophotometrically by measuring absorbance of the reaction mixture at regular time intervals. The effect of various parameters such as pH, concentration of dye, amount of photocatalyst, amount of H2O2 and light intensity on the reaction rate has also been studied. Characterization of photocatalyst has been done by IR spectroscopy, scanning electron microscopy and X-ray diffraction. The Chemical Oxygen Demand (COD) of the reaction mixture has been determined before and after treatment. A tentative mechanism involving ·≡OH radical as an oxidant for degradation of dye has also been proposed. Involvement of ·≡OH radicals as an active oxidizing agent has been confirmed by using isopropanol and butylated hydroxy toluene (BHT) as radical scavengers. It has been observed that the rate of reaction is drastically reduced in the presence of these scavengers. The rate of reaction is much retarded by using BHT as compared with isopropanol.