Photocatalytic degradation of Congo red, Crystal violet and Textile Industrial effluent using cuprous oxide nanoparticles synthesized using root extract of Withania somnifera (original) (raw)
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DESALINATION AND WATER TREATMENT
Photocatalysis possesses enormous potential to facilitate the removal of environmental pollutants in the environment friendly ways. The nanostructured metal oxides have been found to show promising photocatalytic efficiencies toward organic pollutants. The present study deals with the synthesis of cuprous oxide and cupric oxide nanoparticles and characterization of their physiochemical, and photocatalytic properties using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FT-IR), and UV-visible spectrometer. The as synthesized products were easily collected and purified and also tested for their photocatalytic activity toward water purification for removal of Congo red dye under sunlight. The impact of various factors on the catalytic efficiency of the synthesized nanoparticles, including catalyst concentration, reaction time, and pH of the solution has also been investigated. Both of these synthesized oxides of copper proved worthy of the said photocatalytic reaction and the results demonstrated an effective photodegradation of the Congo red under sunlight. It was found that Cu 2 O possessed higher photodegradation efficiency of 90% as compared to 54% degradation efficiency of CuO.
Cogent Engineering
When organic dye-containing wastewater from textile industries are sometimes released into the environment, the liquids tend to pollute the environment whilst their solid residue accrues on land after the evaporation of the water. Most of these synthetic compounds are known to be poisonous and carcinogenic to living organisms. For this study, a relatively simple, sustainable and cost-effective approach have been utilized to synthesize CuO nanoparticles using copper precursor salts: (CuSO 4 .5H 2 O) and (Cu(NO 3) 2 .3H 2 O), as a remedy for dye pollution reduction in water. Due to their simplicity of synthesis, insignificant harmfulness and cost, copper (II) oxide (CuO) nanoparticles were used to breakdown three generally utilized dyes; Rhodamine B (RhB), Methylene Blue (MB)-[Methylthioninium chloride] and Methyl Orange (MeO). The as-prepared nanoparticles were characterized to
Photocatalytic Degradation of AZO Dye and Rhodamine Dyes Using Copper (II) Oxide Nanoparticles
ASETH-18,ACABES-18 & EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa), 2018
Fresh water pollution by dyes from various industries is raising a lot of concern lately. Despite their well-known toxicity to humans, azo dyes make up over half of the used dye population. Rhodamines are also a well-used class of dyes in industry. This study employed a cost effective, energy efficient, environmentally benign method to degrade Methyl Orange (MeO), Methylene Blue (MB) and Rhodamine B (RhB) dyes. The photocatalyst used was copper (II) oxide (CuO) nano-sized particles synthesised from CuSO 4 .5H 2 O, Cu(NO 3) 2 .3H 2 O and NaOH via a simple solution route with neither a catalyst, template nor a surfactant. The nanoparticles were characterised and used for the photocatalytic degradation of the above dyes in the presence of H 2 O 2. The CuO nanoparticles synthesised from both copper precursors were found to degrade all dyes effectively over the same degradation time interval, recording an overall minimum degradation efficiency of 85 % and maximum of 99 %.
The removal of Congo Red (CR) and Methylene Blue (MB) in aqueous solution using copper (II) oxide nanoparticles as the adsorbent has been studied. Copper (II) Oxide nanoparticles were synthesized by simple aqueous precipitation method and the surface area and bulk density were determined. Batch adsorption kinetic studies were carried out with varied initial dye concentration and varied adsorbent dosage. Non-linear regression method was used to fit experimental data to Pseudo-first order, Intra particle diffusion and Pseudo-second order kinetic models. The results obtained for varied adsorbent doses showed that when the three kinetics models studied were compared, the pseudo-second order kinetic model with R 2 values of 0.9999, 0.9981, 0.9798, 0.9378, 0.9858 and R 2 values of 0.9922, 0.9994, 0.9807, 0.9755 and 0.9960 for Congo red and Methylene blue respectively showed best fit for the sorption process. The results obtained for varied initial dye concentration showed that when the three kinetic models were compared, the intra particle diffusion model with R 2 values of 0.9966, 0.9959, 0.9998, 0.9999, and 0.9997 for the sorption of Congo red and R 2 values of 0.9815, 1.0000, 0.9999, 0.9988 and 0.9999 for Methylene blue, showed best fit. These results obtained showed that Copper (II) Oxide nanoparticles could be used as an adsorbent for the removal of Congo red and Methylene blue from aqueous solution.
Molecules
Withania coagulans contains a complex mixture of various bioactive compounds. In order to reduce the complexity of the plant extract to purify its phytochemical biomolecules, a novel fractionation strategy using different solvent combination ratios was applied to isolate twelve bioactive fractions. These fractions were tested for activity in the biogenic synthesis of cobalt oxide nanoparticles, biofilm and antifungal activities. The results revealed that plant extract with bioactive fractions in 30% ratio for all solvent combinations showed more potent bioreducing power, according to the observed color changes and the appearance of representative absorption peaks at 500–510 nm in the UV-visible spectra which confirm the synthesis of cobalt oxide nanoparticles (Co3O4 NPs). XRD diffraction was used to define the crystal structure, size and phase composition of the products. The fractions obtained using 90% methanol/hexane and 30% methanol/hexane showed more effectiveness against biofi...
Water Science and Technology
In the present study, photo catalytic degradation of azo dye Congo Red was conducted using Fe nano particles (nZVI) in the presence of UV light. nZVI was biosynthesized using FeSO4.7H2O precursor and leaf extract of Shorea robusta (sal) as reducing agent under optimum condition of 1 mM concentration of precursor and a ratio of 1:1 Sal leaf extract to precursor. TEM and AFM images revealed formation of well dispersed spherical nano particles of 54–80 nm. SAED patterns of nZVI particles indicated its crystalline nature, while EDX result showed the presence of iron as the most abundant element. In batch experiments, optimum degradation of CR was 96% at 220 ppm CR with a dose of 1.2 g/L nZVI at pH 4 in 15 min following pseudo second order kinetics. The study suggested nZVI to be a potentially economic and ecofriendly technique for treatment of Congo Red.
Removal of Congo Red Dye Using Ficus benghalensis-Assisted Copper Oxide Nanoparticles
Asian Journal of Chemical Sciences
Novel water purification technologies are emerging to satisfy the requirement of clean drinking water for human life. The development of long-term water treatment systems is a serious concern. In this regard, nanotechnology holds enormous promise for improving the effectiveness and efficiency of polluted water remediation. The goal of this work was to create a simple and effective water purification system that used cost-effective, durable, and environmentally friendly novel materials. Green nanoparticle synthesis has emerged as a result of recent advancements in environmentally friendly technologies. The use of plant extract to synthesize nanoparticles is thought to be an incredible green strategy. In the present study, leaf extract of Ficus benghalensis was chosen to synthesize the low cost and novel copper oxide (CuO) nanoparticles. The aim was to investigate the ability of these novel nano particles in removing Congo red dye from water. Various parameters including contact time,...
Ceramics International, 2014
In this study, Congo red organic dye was degraded by different morphologies of CuO and it was found that CuO nanorods are more favorable for the degradation of Congo red due to their more specific surface area and sensitive surface for the Congo red. All the CuO nanostructures were prepared by low temperature aqueous growth method. Scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) techniques were used for the morphological and structural characterization of CuO nanostructures. The relative degradation of Congo red for nanorods, nanoleaves and nanosheets was in order 67%, 48% and 12% respectively.
Congo Red Azo Dye Removal and Study of Its Kinetics by Aloe Vera Mediated Copper Oxide Nanoparticles
Indonesian Journal of Chemistry
Nanotechnology is generating interest of researchers toward cost-free and environment-friendly biosynthesis of nanoparticles. In this research, biosynthesis of stable copper nanoparticles has been done by using aloe vera leaves extract which has been prepared in de-ionized water. The aim of this study is the tracing of an object by green synthesis of copper oxide nanoparticles with the interaction of leaves extract and copper salt and its dye removal efficiency. The results have confirmed the efficient removal of Congo red (CR) dye using copper oxide nanoparticles. Furthermore, we have examined the effect of variables like concentration, time, pH, and adsorbent dosage. We have observed maximum 1.1 mg/g dye removal at 10 min time interval, pH 2, and 5 mg/g nanoparticles. The shape of the copper nanoparticles was spherical, and their range of grain was 80–120 nm. The EDX of synthesized nanoparticles showed copper 38% and 65% oxygen. UV spectrophotometer analysis confirms peak of the c...