A novel and effective system was developed for the complete treatment of NOx from flue gases. The system consisted of photocatalytic or ozone oxidation of NOx, followed by scrubbing and biological denitrification. Maximum photocatalytic oxidation of NOx was achieved while using powdered TiO2 at a catalytic loading rate of 10 g/h, relative humidity of 50%, and a space time of 10 s. The used catalyst was regenerated and reused. A total of 72% of oxidized NO was recovered as HNO3/HNO2 in the regeneration process. Stoichiometrically, 10% excess ozone was able to affect 100% oxidation of NO to NO2. Presence of SO2 adversely influenced the oxidation of NO by ozone. The scrubbing of NO was effective with distilled water. Heterotrophic denitrifiers were able to denitrify the leachate with an efficiency of 90%, using sewage (COD 450 mg/L) as electron donor. The new integrated treatment system seems to be a promising alternative for complete treatment of NOx from flue gases.

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Nanotechnology is a remarkable platform for water treatment and mitigation from microorganisms and organic dyes when compared to traditional treatment methods. This research work provides the solution to water pollution by magnetic nanoparticles (NPs) through a Fenton-like reaction at neutral pH and also the reusability of wastewater for wheat seeds growth. Benchmarking of obtained results revealed that the synthesized Fe2O3 nanoparticles (IONPs) degrade methylene blue (MB) dye only in 10 min (k1= 0.3387 min-1, R2 = 0.97 using Langmuir-Hinshelwood model and optimum conditions: 20 mM H2O2, pH 7, 0.22 g/L nanocatalyst, MB=10 mg/L) under dark condition. Fruit industry byproducts can be served as a reliable source of green capping and reducing agents for the synthesis of bio-inspired NPs. So, this unique study reports the synthesis of Fe2O3 NPs from lemon peel extract (LPE). The bio-inspired nanoparticles were characterized by Dynamic light scattering (DLS), UV-Visible spectroscopy, Zeta potential, and X-ray diffractometry (XRD).FESEM images clearly claimed for cubical nanostructure ranges from 40-70 nm, which is further confessed by XRD analysis (42 nm). DLS and Zeta potential described the stability of NPs. FTIR spectroscopy describes the interaction of NPs with different organic compounds of LPE. Antibacterial activity was investigated against gram-positive (Bacillus megaterium, Bacillus subtilis) and gram-negative (Escherichia coli, Salmonella typhimurium) aerobics, gram-positive cocci (Staphylococcus aureus) and antifungal activity were performed against Fusarium solani. Biosynthesized NPs show dose-dependent free radical scavenging activity with DPPH.

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