Hexavalent chromium removal over magnetic carbon nanoadsorbents: synergistic effect of fluorine and nitrogen co-doping

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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CO2 hydrogenation into CH4 over Ni–Fe catalysts

Functional Materials Letters ◽

10.1142/s1793604718500571 ◽

2018 ◽

Vol 11 (03) ◽

pp. 1850057 ◽

Cited By ~ 8

Author(s):

Reza Meshkini Far ◽

Olena V. Ischenko ◽

Alla G. Dyachenko ◽

Oleksandr Bieda ◽

Snezhana V. Gaidai ◽

...

Keyword(s):

Low Temperature ◽

Synergistic Effect ◽

Atmospheric Pressure ◽

High Efficiency ◽

Co2 Hydrogenation ◽

Hydrogenation Catalysts ◽

Fe Catalysts ◽

First Time ◽

Supported Ni ◽

Hydrogenation Of Co

Here, we report, for the first time, on the catalytic hydrogenation of CO2 to methane at atmospheric pressure. For the preparation of hydrogenation catalysts based on Ni and Fe metals, a convenient method is developed. According to this method, low-temperature reduction of the co-precipitated Ni and Fe oxides with hydrogen gives the effective and selective bimetallic Ni[Formula: see text]Fe[Formula: see text], Ni[Formula: see text]Fe[Formula: see text] and Ni[Formula: see text]Fe[Formula: see text] catalysts. At the temperature range of 300–400[Formula: see text]C, they exhibit a high efficiency of CH4 production with respect to monometallic Ni and Fe catalysts. The results imply a synergistic effect between Ni and Fe which caused the superior activity of the Ni[Formula: see text]Fe[Formula: see text] catalyst conversing [Formula: see text]% of CO2 into CH4 at 350[Formula: see text]C. To adapt the Ni–Fe catalysts in the industry, the effect of two different carriers on the efficiency of the alumina-supported Ni[Formula: see text]Fe[Formula: see text] catalyst was investigated. It is found that the Ni[Formula: see text]Fe[Formula: see text]/[Formula: see text]-Al2O3 catalyst effectively conversed CO2 giving 100% methane yield already at 275[Formula: see text]C.

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Facile construction of Fe, N and P co-doped carbon spheres by carbothermal strategy for the adsorption and reduction of U(vi)

RSC Advances ◽

10.1039/d0ra06252a ◽

2020 ◽

Vol 10 (57) ◽

pp. 34859-34868

Author(s):

Zhimin Dong ◽

Zhibin Zhang ◽

Runze Zhou ◽

Yayu Dong ◽

Yuanyuan Wei ◽

...

Keyword(s):

Magnetic Separation ◽

Removal Efficiency ◽

Environmental Remediation ◽

Carbon Sphere ◽

Carbon Spheres ◽

Practical Applications ◽

Magnetic Carbon ◽

Co Doped

The constructed novel magnetic carbon sphere co-doped by N, P, Fe (Fe/P-CN) exhibits high U(vi) removal efficiency, excellent magnetic separation and reusability, evidencing the potential practical applications in environmental remediation.

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Surface modification of co-doped reduced graphene oxide through alkanolamine functionalization for enhanced electrochemical performance

New Journal of Chemistry ◽

10.1039/c7nj03592f ◽

2018 ◽

Vol 42 (2) ◽

pp. 1105-1114 ◽

Cited By ~ 6

Author(s):

Mahima Khandelwal ◽

Yuanyuan Li ◽

Seung Hyun Hur ◽

Jin Suk Chung

Keyword(s):

Surface Modification ◽

Graphene Oxide ◽

Synergistic Effect ◽

Electrochemical Performance ◽

Reduced Graphene Oxide ◽

Co Doping ◽

Reduced Graphene ◽

Enhanced Electrochemical Performance ◽

Co Doped

The synergistic effect of heteroatom co-doping and triethanolamine functionalization on reduced graphene oxide resulted in impressive electrochemical features.

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Hexavalent Chromium Removal from Drinking Water

Water Science & Technology ◽

10.2166/wst.1985.0207 ◽

1985 ◽

Vol 17 (6-7) ◽

pp. 1121-1132 ◽

Cited By ~ 10

Author(s):

J. M. Philipot ◽

F. Chaffange ◽

J. Sibony

Keyword(s):

Hexavalent Chromium ◽

Potable Water ◽

Fine Sand ◽

High Rate ◽

Chromium Removal ◽

Metal Working ◽

Iron Sulphate ◽

Groundwater Source ◽

Removal Studies ◽

First Time

A series of tests were performed with a view to solving the problem of chromium pollution in the Meulan district near Paris, due to the proximity of long-established metal-working plants. It was found that the accumulated pollution not only originated from the groundwater source but also from atmospheric contamination through fall-out from smoke and fumes issuing from local metal-works' stacks. Among the interesting features of this paper is the fact that, since the profound penetration by the pollutant affects potable feedstock, chromium removal studies have been made on potable water for the first time on record. Several methods are reviewed, among which the only economically feasible one appears to be the reduction of hexavalent chromium by a sufficient quantity of iron sulphate, the problem attached to iron-sulphate overdose being solved by the application of high-rate filtration on very fine sand. This arrests the fine precipitates and reduces the residual ferrous-iron by catalysis. Reliability of the treatment is ensured by a system of continuous metering that automatically controls reagent dosing.

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Investigations of the optical and electronic effects of silicon and indium co-doping on ZnO thin films deposited by spray pyrolysis

Zeitschrift für Naturforschung B ◽

10.1515/znb-2019-0196 ◽

2020 ◽

Vol 75 (1-2) ◽

pp. 23-32 ◽

Cited By ~ 2

Author(s):

Yiwen Fang ◽

Jonathan R. Dilworth ◽

Michael Pepper ◽

Peter P. Edwards

Keyword(s):

Thin Films ◽

Spray Pyrolysis ◽

Indium Content ◽

Zno Thin Films ◽

Silicon Doping ◽

Electronic Effects ◽

Significant Saving ◽

Co Doping ◽

First Time ◽

Co Doped

AbstractSilicon and indium co-doped ZnO thin films with both high optical and electrical performances have been successfully synthesised for the first time by the technique of spray pyrolysis. We find that this co-doping strategy can achieve comparable Figures-of-Merit performances to indium zinc oxide itself, but with, importantly, a significant saving in the indium content. The properties of the co-doped films are compared with those of either single indium or silicon doping.

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High thermochromic performance of Fe/Mg co-doped VO2 thin films for smart window applications

Journal of Materials Chemistry C ◽

10.1039/c8tc01111g ◽

2018 ◽

Vol 6 (24) ◽

pp. 6502-6509 ◽

Cited By ~ 22

Author(s):

Chunhui Ji ◽

Zhiming Wu ◽

Lulu Lu ◽

Xuefei Wu ◽

Jun Wang ◽

...

Keyword(s):

Thin Films ◽

New Method ◽

Smart Window ◽

Smart Windows ◽

Practical Applications ◽

Co Doping ◽

Window Applications ◽

Vo2 Thin Films ◽

First Time ◽

Co Doped

A new method, Fe/Mg co-doping, is proposed for the first time to optimize thermochromic VO2 and the promising performance of VO2-based smart windows for practical applications is successfully achieved.

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A high-efficiency N/P co-doped graphene/CNT@porous carbon hybrid matrix as a cathode host for high performance lithium–sulfur batteries

Journal of Materials Chemistry A ◽

10.1039/c7ta06504c ◽

2017 ◽

Vol 5 (38) ◽

pp. 20458-20472 ◽

Cited By ~ 71

Author(s):

Huali Wu ◽

Li Xia ◽

Juan Ren ◽

Qiaoji Zheng ◽

Chenggang Xu ◽

...

Keyword(s):

Electrochemical Performance ◽

High Performance ◽

High Efficiency ◽

One Pot ◽

Excellent Electrochemical Performance ◽

Lithium Sulfur Batteries ◽

Doped Graphene ◽

First Time ◽

Co Doped ◽

Lithium Sulfur

Eco-friendly, multi-heteroatom-doped 3D hybrids were constructed for the first time by one-pot pyrolysis and showed excellent electrochemical performance.

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Highly sensitive SnO2 nanofiber chemiresistors with a low optimal operating temperature: synergistic effect of Cu2+/Au co-doping

Journal of Materials Chemistry A ◽

10.1039/c4ta01926a ◽

2014 ◽

Vol 2 (33) ◽

pp. 13655-13660 ◽

Cited By ~ 24

Author(s):

Zhenyu Li ◽

Xungai Wang ◽

Tong Lin

Keyword(s):

Synergistic Effect ◽

Operating Temperature ◽

Optimal Operating ◽

Optimal Operating Temperature ◽

Co Doping ◽

Highly Sensitive ◽

Sno2 Nanofiber ◽

Co Doped

SnO2 nanofibers after being co-doped with Cu2+ and Au show considerably enhanced sensing performances at an unexpectedly decreased operating temperature and a synergistic effect occurs when the two dopants are introduced together.

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Effect of Si and Er Co-doping on Green Electroluminescence from GaN:Er ELDs

MRS Proceedings ◽

10.1557/proc-1068-c05-03 ◽

2008 ◽

Vol 1068 ◽

Author(s):

Rui Wang ◽

Andrew J Steckl

Keyword(s):

Thin Films ◽

Forward Bias ◽

Current Control ◽

Dominant Factor ◽

Electroluminescent Devices ◽

Co Doping ◽

Si Substrates ◽

First Time ◽

Bias Condition ◽

Co Doped

ABSTRACT(Er, Si) co-doped GaN thin films were grown on Si substrates by molecular beam epitaxy (MBE) technique. Electroluminescent devices (ELDs) were fabricated and the effect of Si co-doping on the performance of GaN devices was studied. Previous results with GaN:Er ELDs reported that electroluminescence (EL) was much stronger in reverse bias than in forward bias condition, indicating that the dominant factor in EL intensity was the electric field. The results reported here show the first time GaN:Er ELDs where forward bias EL is very much larger, indicating that the dominant factor is forward bias current. The electrical properties of (Si, Er) co-doped GaN thin films are believed to be responsible for the current control mechanism.

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