scholarly journals Photocatalytic degradation of Direct Brown RN dye in the presence of ZnO nanoparticles

2015 ◽  
Vol 50 (1) ◽  
pp. 1-6 ◽  
Author(s):  
ASM A Islam ◽  
T Ferdous ◽  
AK Das ◽  
MM Karim ◽  
SM Masum
Keyword(s):  
Photocatalytic Degradation ◽  
Oxygen Demand ◽  
Major Constituent ◽  
Zno Nanoparticle ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Treated Effluent ◽  
Optimum Reaction ◽  
Ft Ir

The ZnO nanoparticle was prepared by using Zn(NO3)2.6H2O and NaOH under optimum reaction conditions and the prepared nanoparticle was characterized by UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersion X-ray spectroscopy (EDX) and scanning electron microscopy (SEM). The sunlight irradiated photocatalytic degradation of Direct Brown RN dye was studied using ZnO nanoparticle. The results of this investigation revealed that in the presence of sunlight, catalyst load of 0.5 g?L-1 and time of contact of 40 min, ZnO nanoparticle showed substantial capability of destroying Direct Brown RN dye from solution. An actual leather effluent containing Brown RN as a major constituent along with other dyes and dyeing auxiliaries was treated using ZnO and the reduction in the chemical oxygen demand (COD) of the treated effluent revealed almost complete destruction of the organic molecules along with color removal.Bangladesh J. Sci. Ind. Res. 50(1), 1-6, 2015

scholarly journals Aegle marmelosMediated Green Synthesis of Different Nanostructured Metal Hexacyanoferrates: Activity against Photodegradation of Harmful Organic Dyes

Scientifica ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Vidhisha Jassal ◽  
Uma Shanker ◽  
B. S. Kaith
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Degradation ◽  
Organic Dyes ◽  
Degradation Process ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Metal Hexacyanoferrate

Prussian blue analogue potassium metal hexacyanoferrate (KMHCF) nanoparticles Fe4[Fe(CN)6]3(FeHCF), K2Cu3[Fe(CN)6]2(KCuHCF), K2Ni[Fe(CN)6]·3H2O (KNiHCF), and K2Co[Fe(CN)6] (KCoHCF) have been synthesized using plant based biosurfactantAegle marmelos(Bael) and water as a green solvent. It must be emphasized here that no harmful reagent or solvent was used throughout the study. Plant extracts are easily biodegradable and therefore do not cause any harm to the environment. Hence, the proposed method of synthesis of various KMHCF nanoparticles followed a green path. The synthesized nanoparticles were characterized by powder X-ray diffraction (PXRD), Field-Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), and Fourier Transform Infrared Spectroscopy (FT-IR). MHCF nanoparticles were used for the photocatalytic degradation of toxic dyes like Malachite Green (MG), Eriochrome Black T (EBT), Methyl Orange (MO), and Methylene Blue (MB). Under optimized reaction conditions, maximum photocatalytic degradation was achieved in case of KCuHCF nanoparticles mediated degradation process (MG: 96.06%, EBT: 83.03%, MB: 94.72%, and MO: 63.71%) followed by KNiHCF (MG: 95%, EBT: 80.32%, MB: 91.35%, and MO: 59.42%), KCoHCF (MG: 91.45%, EBT: 78.84%, MB: 89.28%, and MO: 58.20%).

Isomerization of α-Pinene over Alumina-Pillared Montmorillonite

2013 ◽  
Vol 746 ◽  
pp. 49-52 ◽  
Author(s):  
Peng Quan Yao ◽  
Lin Hua Zhu ◽  
Jin Yang ◽  
Tian Si
Keyword(s):  
Basal Spacing ◽  
High Catalytic Activity ◽  
Temperature Reaction ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Pillared Montmorillonite ◽  
Catalytic Isomerization ◽  
Optimum Reaction

In this work, the liquid phase catalytic isomerization of α-pinene over alumina-pillared montmorillonitewas investigated, and the influence of reaction temperature, reaction time and amount of the catalyston the conversion of α-pinenewere discussed systematically, and the optimum reaction conditions forisomerization of α-pineneover alumina-pillared montmorillonitewere obtained. The basal spacing of thealumina-pillared montmorillonite was characterized by X-ray diffraction, and the liquid reactant was separated and identified by gas chromatography. The result showed that alumina-pillared montmorillonite with 1.83nm of basal spacing exhibited a high catalytic activity for the isomerization of α-pinene, and 97.4% conversion of α-pinene was achievedat 373K for 3hwhen the mass ratio of catalyst to α-pinene was 1/10.

scholarly journals 3-Bromopyridine-Heterogenized Phosphotungstic Acid for Efficient Trimerization of Biomass-Derived 5-Hydroxymethylfurfural with 2-Methylfuran to C21 Fuel Precursor

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yufei Xu ◽  
Zhaozhuo Yu ◽  
Hu Li ◽  
Song Yang
Keyword(s):  
Phosphotungstic Acid ◽  
Solvothermal Method ◽  
Reaction Pathway ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Acidic Catalyst ◽  
Carbon Compounds ◽  
Ft Ir ◽  
Long Chain

The production of long-chain carbon compounds (C9-C21) from biomass derivatives to alternate traditional fossil diesel is sustainable, eco-friendly, and potentially economic for modern industry. In this work, phosphotungstic acid heterogenized by 3-bromopyridine was achieved using a solvothermal method, which was demonstrated to be efficient for trimerization of biomass-derived 5-hydroxymethylfurfural (HMF) with 2-methylfuran (2-MF) to C21 fuel precursor (57.1% yield) under mild reaction conditions. The heterogeneous acidic catalyst could be reused for four consecutive cycles without obvious loss of activity, and different characterization techniques (e.g., XRD (X-ray diffraction), TG (thermogravimetric analysis), SEM (scanning electron microscope), FT-IR (Fourier transform infrared spectroscopy), and BET (Brunauer-Emmet-Teller)) were utilized to investigate the performance of the catalyst. In addition, a plausible reaction pathway was postulated, on the basis of results obtained by NMR (nuclear magnetic resonance) and GC-MS (gas chromatography-mass spectrometer). This strategy provides a facile and efficient approach to prepare a recyclable acidic catalyst for the production of diesel fuel precursor from biomass via controllable polymerization.

Sonochemical Preparation of Ternary Europium Complexes Eu(DBM)3•phen

2011 ◽  
Vol 233-235 ◽  
pp. 2263-2266
Author(s):  
Hong Quan Yu ◽  
Tao Li ◽  
Hong Dan Wang ◽  
Bao Jiu Chen
Keyword(s):  
Close Relation ◽  
Ethanol Solution ◽  
Ultrasonic Power ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Europium Complexes ◽  
X Ray ◽  
Ft Ir ◽  
Europium Chloride ◽  
The Eu

Eu(DBM)3•phen complexes have been Successfully synthesized by the sonication of an Ethanol solution of europium chloride and dibenzoylmethanide (DBM) in the presence of 1,10-phenanthroline(phen). The properties of the Eu(DBM)3•phen complexes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform Infrared spectroscopy (FT-IR) and fluorescence spectrometry (FS). Reaction conditions, such as ultrasonic power and the concentration of complexing reagent, were found to have close relation with the morphologies of final products. The formation mechanism of Eu(DBM)3•phen complexes with ultrasonic irradiation is discussed in the context.

scholarly journals PHOTOCATALYTIC DEGRADATION OF PARAQUAT USING N-TiO2/SiO2 UNDER VISIBLE LIGHT

2018 ◽  
Vol 55 (4C) ◽  
pp. 277 ◽  
Author(s):  
Nguyen Thi Phuong Mai
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Diffuse Reflectance Spectroscopy ◽  
Organic Pollutant ◽  
Sol Gel ◽  
Oxygen Demand ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Illumination Time ◽  
X Ray

In the present paper, photocatalytic degradation of paraquat using N-TiO2/SiO2 with different molar ratio of titanium: nitrogen (Ti:N) under visible light was investigated. The catalyst was prepared via immersed SiO2 in N-TiO2. N-TiO2 was synthesized by sol-gel method.  The N-TiO2/SiO2 catalyst was characterized using X-ray diffraction, UV diffuse reflectance spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy. The results from characterizations indicated that N-doped anatase TiO2 had a 20-25 nm size. Degradation of paraquat, at an initial concentration of 10 mg/L was determined by UV-Vis. Chemical oxygen demand (COD) was used for process performance. Based on the COD tests, the COD values in residual paraquat was lower than that in initial paraquat concentration after 8 hours illumination of visible light. Moreover, the experiment’s results indicated that 80% of paraquat was degraded within 8 h of illumination time. These results showed that N-TiO2/SiO2 with molar Ti:N=2:1 gives the highest degradation efficiency of paraquat under visible light. This catalyst was stable and reusable suggesting it can be applied to treat organic pollutant in water. 

scholarly journals Optical and Electrical Studies of Polyaniline/ZnO Nanocomposite

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Manawwer Alam ◽  
Naser M. Alandis ◽  
Anees A. Ansari ◽  
Mohammed Rafi Shaik
Keyword(s):  
Polymer Nanocomposite ◽  
Zno Nanoparticle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical Studies ◽  
Transmission Electron ◽  
Conducting Polymer Nanocomposite ◽  
Ft Ir ◽  
Optical Behavior

Polyaniline (Pani)/ZnO nanocomposite with diameter 40–50 nm was successfully fabricated by coprecipitation method of ZnO viain situpolymerization of Pani. X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), fourier transformation infrared (FT-IR), UV-Vis absorption spectra, thermogravimetric analysis (TGA), and electrical properties were studied. HRTEM studies showed that the prepared ZnO nanoparticles were uniformly dispersed and highly stabilized throughout the polymer chain and formed uniform metal oxide-conducting polymer nanocomposite material. UV-Vis spectra of Pani/ZnO nanocomposite were studied to investigate the optical behavior after doping the ZnO nanoparticle into the polymer matrix. The inclusion of ZnO nanoparticle gives rise to the red shift ofπ-π* transition of Pani. The nanocomposite was found to be thermally stable upto 130°C and showed conductivity value of3.0×10−2 Scm−1.

Adsorption Properties of Dyeing Wastewater on 8-Hydroxyquinoline Modified Bentonite

2011 ◽  
Vol 71-78 ◽  
pp. 1118-1122
Author(s):  
Hong Shao ◽  
Ning Cao ◽  
Hong Kang Xiao
Keyword(s):  
Blue Dye ◽  
Dyeing Wastewater ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Modified Bentonite ◽  
X Ray ◽  
Direct Light ◽  
Effects Of Ph ◽  
Optimum Reaction ◽  
Decoloration Rate

A novel adsorption material was synthesized and characterized by the methods of X-ray diffraction and scanning electron microscopy. The optimum reaction conditions of the 8-hydroxyquinoline modified bentonites were studied. And the modified bentonite was applied into the treatment of dyeing wastewater. The decoloration rate was invested as index. The effects of pH, adsorbent dosage, stirring speed, sedimentation time on adsorption have also been studied. The result showed that the decoloration rate of direct light turquoise blue dye on modified bentonites reached 94.12%, and the decoloration rate of acid orange dyeing wastewater reached 74.46%. So this type of modified bentonite was suitable for the treatment of dyeing wastewater.

scholarly journals Microwave Enhanced Synthesis of Flax-g-poly(MMA) for Use in Phenolic Composites as Reinforcement

2008 ◽  
Vol 5 (1) ◽  
pp. 163-168 ◽  
Author(s):  
Susheel Kalia ◽  
B. S. Kaith
Keyword(s):  
Graft Copolymerization ◽  
Phenol Formaldehyde ◽  
Graft Copolymers ◽  
Modulus Of Rupture ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Optimum Reaction ◽  
Xrd Techniques ◽  
Scanning Electron

Graft copolymerization of methyl methacrylate (MMA) onto flax fiber under the influence of microwave radiations (MWR) was carried out. 24.64% grafting was found at 210W microwave power under optimum reaction conditions. The graft copolymers were characterized with FTIR spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. Graft copolymers thus prepared were used in the preparation of phenol-formaldehyde (PF) composites. Modulus of rupture (MOR), modulus of elasticity (MOE) and stress at the limit of proportionality (SP) of composites were measured and it has been found that composites reinforced with Flax-g-poly(MMA) showed better mechanical properties in comparison to composites reinforced with raw flax.

Preparation of TiO2 Nanoparticles Using H2O2/TiOSO4 and Applications in Eosin Yellow Photocatalytic Degradation

2021 ◽  
Vol 19 (9) ◽  
pp. 81-87
Author(s):  
Hind I. Hussein ◽  
Firas H. Abdulrazzak
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Deionized Water ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
X Ray ◽  
Heat Treated ◽  
Ft Ir ◽  
Eosin Yellow

TiO2 was synthesized in this work by chemical route, when the titanium oxysulfato (TiOSO4) react with 4:6 H2O2/H2O after is dissolved in deionized water. The yellow precipitate was drying at 100oC before heat treated at 400°C to obtain crystalline TiO2. The sample were characterized using FT-IR and X-ray diffraction spectroscopy which identified that product was mixture between two form anatase and rutile. The photocatalytic activity of synthesized TiO2 was tested in the degradation of Eousin yellow which compare with two form of TiO2. Evaluated the results was shown that H2O2 was succeed to preparing TiO2 from TiOSO4 with higher activity then anatase and rutile forms.

scholarly journals Preparation of carboxymethyl-quaternized oligochitosan and its scale inhibition and antibacterial activity

2013 ◽  
Vol 4 (2) ◽  
pp. 65-75 ◽  
Author(s):  
Hui-xin Zhang ◽  
Dong-xue Sun ◽  
Yu-chao Zhu ◽  
Ting-ru Yang ◽  
Xiu-hong Jin ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Oxygen Demand ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Static Test ◽  
X Ray ◽  
Microbial Inhibition ◽  
Scale Inhibition ◽  
Calcium Sulfate Scale ◽  
Ft Ir

Carboxymethyl-quaternized oligochitosan (CMQAOC) was prepared through carboxymethylization and N-quaternization of oligochitosan (OC) which was obtained from chitosan degradation. The structure was confirmed by Fourier transform infrared spectroscopy (FT-IR), 1H-NMR, and X-ray diffraction (XRD) analysis. The performances for both scale and microbial inhibition of CMQAOC were evaluated by static test and culture flask method, respectively. The results showed that the scale inhibition rate for calcium carbonate and calcium sulfate scale were both beyond 80% with a CMQAOC dosage of 20 mg/L. With a degree of substitution for quaternary ammonia of up to 0.74, the killing rate for saprophytic bacteria and sulfate-reducting bacteria was 98.9 and 100%, respectively. The ratio of biochemical oxygen demand/chemical oxygen demand (BOD5/COD) of CMQAOC was 0.45, showing that CMQAOC is as biodegradable as OC.

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