Removing dye Rhodamine B from aqueous medium via wet peroxidation with V-MCM-41 and H2O2

2009 ◽  
Vol 59 (3) ◽  
pp. 565-571 ◽  
Author(s):  
Deyong Wu ◽  
Mingce Long ◽  
Chao Chen ◽  
Yahui Wu ◽  
Weimin Cai ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Mesoporous Structure ◽  
Heterogeneous Fenton ◽  
Bet Method ◽  
Wide Ph Range ◽  
Ph Range ◽  
Tetraethyl Silicate ◽  
Mcm 41

A new heterogeneous Fenton-like system, consisting of V-MCM-41 catalyst and hydrogen peroxide, was proved to be effective in removing recalcitrant dye Rhodamine B (RhB) in aqueous solutions. V-MCM-41 was prepared following a direct hydrothermal procedure with tetraethyl silicate and ammonium metavanadate as precursor. The mesoporous structure has been characterized by XRD, and the specific surface area was determined as x m2 g−1 according to BET method. The catalytic reaction can proceed in a relatively wide pH range from acidic to alkaline. And the visible light irradiation cannot promote the reaction process. In addition, the mechanism implication for V-MCM-41 as a Fenton-like catalyst has been discussed.

High degradation efficiency of sulfamethazine with the dual-reaction-center Fe-Mn-SiO2 Fenton-like nanocatalyst in a wide pH range

2021 ◽  
Author(s):  
Manoj Kumar Panjwani ◽  
Qing Wang ◽  
Yueming Ma ◽  
Yuxuan Lin ◽  
Feng Xiao ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Reaction Center ◽  
Degradation Efficiency ◽  
Heterogeneous Fenton ◽  
Wide Ph Range ◽  
Ph Range

The development of a heterogeneous Fenton-like catalyst, possessing high degradation efficiency in a wide pH range, is crucial for wastewater treatment. The Fe-Mn-SiO2 catalyst was designed, and prepared by a...

Preparation and Properties of a Cholesterol Oxidase from Nocardia sp. and Its Application to the Enzymatic Assay of Total Cholesterol in Serum

1973 ◽  
Vol 19 (12) ◽  
pp. 1350-1356 ◽  
Author(s):  
W Richmond
Keyword(s):  
Hydrogen Peroxide ◽  
Total Cholesterol ◽  
Enzyme Assay ◽  
Cholesterol Oxidase ◽  
Xylenol Orange ◽  
Extraction And Purification ◽  
Production Of Hydrogen ◽  
Nocardia Sp ◽  
Wide Ph Range ◽  
Ph Range

Abstract I describe the characterization, extraction, and purification of a cholesterol:oxygen oxidoreductase (EC 1.1.3.6) from Nocardia sp. This enzyme catalyzes oxidation of cholesterol to Δ4-choIestenone, with production of hydrogen peroxide. It is very stable, active over a wide pH range, and has a Km of 1.4 x 10-5 mol/ liter. It is highly specific for Δ4- or Δ5-3β-hydroxycholestanes, and may be applied to the assay of serum total cholesterol. In the procedure presented here, hydrogen peroxide is measured by reaction with quadrivalent titanium and xylenol orange. This constitutes a one-enzyme assay with stable reagents, which does not require protein precipitation and is not subject to interference from hemoglobin or bilirubin.

scholarly journals Preparation of a series of N-alkyl-3-boronopyridinium halides and study of their stability in the presence of hydrogen peroxide

2012 ◽  
Vol 10 (4) ◽  
pp. 1059-1065 ◽  
Author(s):  
Yevgen Karpichev ◽  
Hubert Matondo ◽  
Illia Kapitanov ◽  
Oleksandr Savsunenko ◽  
Marc Vedrenne ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Thermal Degradation ◽  
Microwave Irradiation ◽  
Room Temperature ◽  
Ester Hydrolysis ◽  
Water Solutions ◽  
Boronic Ester ◽  
Wide Ph Range ◽  
Ph Range

AbstractA simple and efficient protocol for the preparation of a series of N-alkyl-3-boronopyridinium salts is described which requires exposure of 3-pyridineboronic acid neopentylglycol ester and corresponding alkyle halide to microwave irradiation followed by boronic ester hydrolysis. The technique employed drastically reduces the reaction time and prevents thermal degradation and the formation of side products. Water solutions of the obtained boronopyridinium salts are shown to be stable at room temperature in wide pH range as well as in the presence of hydrogen peroxide at pH 10.0 for 72 h.

scholarly journals Facile Production of a Fenton-Like Photocatalyst by Two-Step Calcination with a Broad pH Adaptability

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 676
Author(s):  
Siyang Ji ◽  
Yanling Yang ◽  
Xing Li ◽  
Hang Liu ◽  
Zhiwei Zhou
Keyword(s):  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Active Oxygen Species ◽  
Oxygen Species ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Wide Ph Range ◽  
Calcination Method ◽  
Ph Range

A novel heterogeneous Fenton-like photocatalyst, Fe-doped graphitic carbon nitride (Fe-g-C3N4), was produced by facile two-step calcination method. This Fe–g–C3N4 catalyzed rhodamine B degradation in the presence of H2O2 accompanied with visible light irradiation. transmission electron microscopy(TEM), x-ray diffraction (XRD), FT-IR, x-ray photoelectron spectroscopy (XPS), and photoluminescence fluorescent spectrometer (PL) characterization analysis methods were adopted to evaluate the physicochemical property of samples. It can be observed that the Fe-g-C3N4 exhibited excellent photocatalytic Fenton-like activity at a wide pH range of 3–9, with rhodamine B(RhB) degradation efficiency up to 95.5% after irradiation for 45 min in the presence of 1.0 mM H2O2. Its high activity was ascribed to the formation of Fe–N ligands in the triazine rings that accelerated electron movement driving the Fe(III)/Fe(II) redox cycle, and inhibited photo-generated electron hole re-combinations for continuous generation of reactive oxygen species by reactions between Fe(II) and H2O2. The main active oxygen species were hydroxyl radicals, followed by superoxide radicals and hole electrons. This produced catalyst of Fe–g–C3N4 shows excellent reusability and stability, and can be a promising candidate for decontamination of wastewater.

Heterogeneous Fenton-like degradation of ofloxacin over a wide pH range of 3.6–10.0 over modified mesoporous iron oxide

2017 ◽  
Vol 328 ◽  
pp. 397-405 ◽  
Author(s):  
Xike Tian ◽  
Hang Jin ◽  
Yulun Nie ◽  
Zhaoxin Zhou ◽  
Chao Yang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Heterogeneous Fenton ◽  
Wide Ph Range ◽  
Ph Range

scholarly journals Photocatalytic Degradation of Rhodamine B in Heterogeneous and Homogeneous Systems

2021 ◽  
Vol 49 (1) ◽  
pp. 9-16
Author(s):  
Asfandyar Khan ◽  
Zsolt Valicsek ◽  
Ottó Horváth
Keyword(s):  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Reaction Rate ◽  
Vibrio Fischeri ◽  
Antibacterial Property ◽  
Copper Ferrite ◽  
Experimental Conditions ◽  
Wide Ph Range ◽  
Bioluminescence Assay ◽  
Ph Range

This study focuses on the photocatalytic degradation of Rhodamine B (RhB) in heterogeneous and homogeneous photo-Fenton reactions. In the heterogeneous system, iron(II) doped copper ferrite CuII(x)FeII(1-x)FeIII2O4 nanoparticles (NPs) prepared in our previous work were employed as potential catalysts. The photodegradation of RhB was carried out in a quartz cuvette located in a diode array spectrometer. The experimental conditions such as pH, NPs dosage and H2O2 dosage with regard to the photocatalytic degradation of RhB were optimized to be 7.5, 500 mg/L and 8.9x10-2 mol/L, respectively. In addition, visible light-induced photodegradation of RhB was also carried out by using \ch{H2O2} over a wide pH range in the absence of heterogeneous photocatalysts. It was observed that the reaction rate significantly increased above pH 10, resulting in a faster rate of degradation of RhB, which may be attributed to the deprotonation of hydrogen peroxide. Furthermore, the potential antibacterial property of such catalysts against the Gram-negative bacterium Vibrio fischeri in a bioluminescence assay yielded inhibition activities of more than 60% in all cases.

scholarly journals Novel Enzyme-Free Multifunctional Bentonite/Polypyrrole/Silver Nanocomposite Sensor for Hydrogen Peroxide Detection over a Wide pH Range

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4442 ◽  
Author(s):  
Khouloud Jlassi ◽  
Mostafa H. Sliem ◽  
Kamel Eid ◽  
Igor Krupa ◽  
Mohamed M. Chehimi ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ag Nanoparticles ◽  
Rational Design ◽  
Uv Light ◽  
Low Cost ◽  
Current Response ◽  
Ag Nps ◽  
Hydrogen Peroxide Detection ◽  
Wide Ph Range ◽  
Ph Range

Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is presented for the rational design of ternary bentonite-silylpropyl-polypyrrole/silver nanoarchitectures (denoted as BP-PS-PPy/Ag) via the in-situ photo polymerization of pyrrole with salinized bentonite (BP-PS) in the presence of silver nitrate. The Pyrrolyl-functionalized silane (PS) is used as a coupling agent for tailoring the formation of highly exfoliated BP-PS-PPy sheet-like nanostructures ornamented with monodispersed Ag nanoparticles (NPs). Taking advantage of the combination between the unique physicochemical properties of BP-PS-PPy and the outstanding catalytic merits of Ag nanoparticles (NPs), the as-synthesized BP-PS-PPy/Ag shows a superior electrocatalytic reduction and high-detection activity towards H2O2 under different pH conditions (from 3 to 10). Intriguingly, the UV-light irradiation significantly enhances the electroreduction activity of H2O2 substantially, compared with the dark conditions, due to the high photoelectric response properties of Ag NPs. Moreover, BP-PS-PPy/Ag achived a quick current response with a detection limit at 1 μM within only 1 s. Our present approach is green, facile, scalable and renewable.

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