scholarly journals A luminescent inorganic–organic hybrid, [Cd(C16H10N2O8S)(H2O)], for the selective and recyclable detection of chromates and dichromates in aqueous solution

2019 ◽  
Vol 43 (33) ◽  
pp. 13263-13270 ◽  
Author(s):  
Tanaya Kundu ◽  
Krishna Manna ◽  
Ajay K. Jana ◽  
Srinivasan Natarajan
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Aqueous Medium ◽  
Three Dimensional ◽  
Organic Hybrid ◽  
Good Catalytic Activity ◽  
Dichromate Anions

A three-dimensional inorganic–organic hybrid [Cd(H2L)(H2O)], was shown to exhibit good catalytic activity as well as to detect highly toxic chromate and dichromate anions in aqueous medium with good selectivity.

scholarly journals A Highly Sensitive Electrochemical Glucose Sensor Based on Room Temperature Exfoliated Graphite-Derived Film Decorated with Dendritic Copper

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5067
Author(s):  
Jiaxin Tang ◽  
Luo Wei ◽  
Shuaijie He ◽  
Jihui Li ◽  
Ding Nan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Performance ◽  
High Stability ◽  
Room Temperature ◽  
Glucose Sensor ◽  
Three Dimensional ◽  
Exfoliated Graphite ◽  
Highly Sensitive ◽  
Free Glucose ◽  
Good Catalytic Activity

An ultrasensitive enzyme-free glucose sensor was facilely prepared by electrodepositing three-dimensional dendritic Cu on a room temperature exfoliated graphite-derived film (RTEG-F). An excellent electrocatalytic performance was demonstrated for glucose by using Cu/RTEG-F as an electrode. In terms of the high conductivity of RTEG-F and the good catalytic activity of the dendritic Cu structures, the sensor demonstrates high sensitivities of 23.237 mA/mM/cm2, R2 = 0.990, and 10.098 mA/mM/cm2, R2 = 0.999, corresponding to the concentration of glucose ranging from 0.025 mM to 1.0 mM and 1.0 mM to 2.7 mM, respectively, and the detection limit is 0.68 μM. In addition, the Cu/RTEG-F electrode demonstrates excellent anti-interference to interfering species and a high stability. Our work provides a new idea for the preparation of high-performance electrochemical enzyme-free glucose sensor.

Poly[bis{μ2-4-[3,5-bis(pyridin-4-yl)phenyl]pyridine}nona-μ2-oxido-tetraoxidocopper(II)tetramolybdenum(VI)]

2012 ◽  
Vol 68 (12) ◽  
pp. m329-m332
Author(s):  
Hou-Ting Liu ◽  
Jing Lu
Keyword(s):  
Aqueous Medium ◽  
Title Compound ◽  
Copper Acetate ◽  
Three Dimensional ◽  
Ammonium Molybdate ◽  
Two Dimensional ◽  
Hydrothermal Conditions ◽  
Organic Hybrid ◽  
Hybrid Framework ◽  
Copper Center

The title compound, [CuMo4O13(C21H15N3)2]n, was synthesized by the reaction of ammonium molybdate, copper acetate and 4-[3,5-bis(pyridin-4-yl)phenyl]pyridine (DPPP) in an aqueous medium under hydrothermal conditions. The two unique molybdenum centers and the copper center adopt MoO4tetrahedral, MoO5N octahedral and CuO4N2octahedral geometries, respectively. These polyhedra are connected to each other through corner-sharing to form a two-dimensional Cu–Mo–O layer, which is further linked by the DPPP ligands to form the three-dimensional inorganic–organic hybrid framework.

Three-dimensional TiO2/CeO2 nanowire composite for efficient formaldehyde oxidation at low temperature

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7729-7733 ◽  
Author(s):  
Yongchao Huang ◽  
Haibo Li ◽  
Muhammad-Sadeeq Balogun ◽  
Hao Yang ◽  
Yexiang Tong ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Three Dimensional ◽  
Toluene Oxidation ◽  
Formaldehyde Oxidation ◽  
Good Catalytic Activity

TiO2/CeO2 nanowires exhibited superior catalytic activity that could convert 60.2% of HCHO to CO2 and H2O at a low temperature of 60 °C, and also showed a good catalytic activity toward toluene oxidation.

scholarly journals Synthesis of Highly Stable Cobalt Nanomaterial Using Gallic Acid and Its Application in Catalysis

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Saba Naz ◽  
Abdul Rauf Khaskheli ◽  
Abdalaziz Aljabour ◽  
Huseyin Kara ◽  
Farah Naz Talpur ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Methyl Orange ◽  
Green Synthesis ◽  
Aqueous Medium ◽  
Gallic Acid ◽  
Azo Dyes ◽  
Room Temperature ◽  
Model Compound ◽  
Characterization Studies

We report the room temperature (25–30°C) green synthesis of cobalt nanomaterial (CoNM) in an aqueous medium using gallic acid as a reducing and stabilizing agent. pH 9.5 was found to favour the formation of well dispersed flower shaped CoNM. The optimization of various parameters in preparation of nanoscale was studied. The AFM, SEM, EDX, and XRD characterization studies provide detailed information about synthesized CoNM which were of 4–9 nm in dimensions. The highly stable CoNM were used to study their catalytic activity for removal of azo dyes by selecting methyl orange as a model compound. The results revealed that 0.4 mg of CoNM has shown 100% removal of dye from 50 μM aqueous solution of methyl orange. The synthesized CoNM can be easily recovered and recycled several times without decrease in their efficiency.

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

Decomposition of hydrogen peroxide on a two-component NiO-CdO catalyst and the effect of ionizing radiation on its catalytic properties

1979 ◽  
Vol 44 (4) ◽  
pp. 1015-1022 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Nickel Oxide ◽  
Catalytic Properties ◽  
Cadmium Oxide ◽  
Chemisorb Oxygen ◽  
Composition Region ◽  
Chemisorbed Oxygen ◽  
Two Component

The catalytic properties of two-component catalyst nickel oxide-cadmium oxide with the proportions of the components covering the whole composition region 0-100% were examined by studying the decomposition of hydrogen peroxide in aqueous solution on it. In the range 0-25 mol.% CdO, cadmium oxide is found to affect infavourably the ability of nickel oxide to chemisorb oxygen. The amount of the chemisorbed oxygen increases several times on gamma irradiation of the samples. The effect of cadmium oxide on the catalytic activity of the system shows up in fresh samples only indirectly via the changed amount of the oxygen chemisorbed. In older samples the initial catalytic activity of the system is changed, which can be explained based on the concept of bivalent catalytic centres in terms of the co-action of the catalytic centres of the two oxides, which are in equilibrium. The irradiation of the system under study speeds up the processes leading to the establishing of this equilibrium which is thermally very stable, and results in a substantial increase of the catalytic activity of the samples investigated.

scholarly journals CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 131 ◽  
Author(s):  
Rola Mohammad Al Soubaihi ◽  
Khaled Mohammad Saoud ◽  
Myo Tay Zar Myint ◽  
Mats A. Göthelid ◽  
Joydeep Dutta
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Active Sites ◽  
Bond Activation ◽  
Dissociative Adsorption ◽  
High Catalytic Activity ◽  
Good Catalytic Activity ◽  
Pretreatment Conditions ◽  
Oxidation Efficiency

Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (Tig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than Tig. The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at Tig to form CO2. Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.

Three-dimensionally ordered macroporous spinel-type MCr2O4 (M = Co, Ni, Zn, Mn) catalysts with highly enhanced catalytic performance for soot combustion

2015 ◽  
Vol 5 (9) ◽  
pp. 4594-4601 ◽  
Author(s):  
Jinguo Wang ◽  
Gaoyang Yang ◽  
Li Cheng ◽  
Eun Woo Shin ◽  
Yong Men
Keyword(s):  
Catalytic Activity ◽  
Three Dimensional ◽  
Catalytic Performance ◽  
Soot Combustion ◽  
Spinel Type ◽  
Ordered Macroporous

MCr2O4 catalysts with three-dimensional ordered macroporous structures displayed superior catalytic activity for soot combustion to their bulk counterparts.

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