scholarly journals Adsorption of heavy metal with modified eggshell membrane and the in situ synthesis of Cu–Ag/modified eggshell membrane composites

2018 ◽  
Vol 5 (9) ◽  
pp. 180532 ◽  
Author(s):  
Yaqing Xin ◽  
Caihong Li ◽  
Jianing Liu ◽  
Jinrong Liu ◽  
Yuchen Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Catalytic Performance ◽  
Eggshell Membrane ◽  
Chelating Ligands ◽  
Ag Nps ◽  
Key Factor ◽  
Coordination Effect ◽  
Effective Sorbent ◽  
Excellent Catalytic Performance

The objectives of this study were to remove heavy metals from wastewater through the biosorption method with modified biomass as an effective sorbent and to prepare metal/biomass composites with the same modified biomass as a direct template. Eggshell membrane (ESM) was selected and modified to adsorb heavy metals. Adsorption of metal ions on the modified ESM (MESM) might be attributed to electrostatic interaction, ion exchange and coordination effect with chelating ligands containing N and S on the surface of the MESM. The pH of the solution was a key factor affecting the adsorption. The Cu–Ag/MESM composites with uniform Cu–Ag NPs were prepared with MESM as matrices, and with Cu 2+ and Ag + adsorbed as metal sources. The Cu–Ag/MESM showed excellent catalytic performance in the reduction of 4-nitrophenol to 4-aminophenol in the aqueous phase. Because of the high stability of the Cu–Ag NPs supported on the macro-dimension supporter, Cu–Ag/MESM can be easily separated after the catalytic reaction and recycled.

Photo-excited in situ loading of Pt clusters onto rGO immobilized SnO2 with excellent catalytic performance toward methanol oxidation

Nano Energy ◽  
2016 ◽  
Vol 26 ◽  
pp. 699-707 ◽  
Author(s):  
Shouliang Wu ◽  
Jun Liu ◽  
Dewei Liang ◽  
Hongmei Sun ◽  
Yixing Ye ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Catalytic Performance ◽  
Excellent Catalytic Performance

Three dimensional nitrogen-doped graphene hydrogels with in situ deposited cobalt phosphate nanoclusters for efficient oxygen evolution in a neutral electrolyte

2016 ◽  
Vol 1 (1) ◽  
pp. 41-44 ◽  
Author(s):  
Anthony Vasileff ◽  
Sheng Chen ◽  
Shi Zhang Qiao
Keyword(s):  
Oxygen Evolution ◽  
Three Dimensional ◽  
Catalytic Performance ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Neutral Electrolyte ◽  
Cobalt Phosphate ◽  
Excellent Catalytic Performance

Nitrogen doped graphene hydrogel electrocatalysts with in situ deposited cobalt phosphate demonstrated excellent catalytic performance toward oxygen evolution in a neutral electrolyte.

Preparation of P(St-co-MAA)/CeO2 composite microspheres via surface carboxyl oxidation followed by in situ chemical deposition of CeO2 and their catalytic application on oxidative degradation of methyl orange

RSC Advances ◽  
2014 ◽  
Vol 4 (55) ◽  
pp. 29042-29049 ◽  
Author(s):  
Guanzhi Cheng ◽  
Xinyi Huang ◽  
Hong Zhang ◽  
Yang Hu ◽  
Chengyou Kan
Keyword(s):  
Methyl Orange ◽  
Oxidative Degradation ◽  
Chemical Deposition ◽  
Catalytic Performance ◽  
Composite Microspheres ◽  
Catalytic Application ◽  
Degradation Of Methyl Orange ◽  
Excellent Catalytic Performance

P(St-co-MAA)/CeO2 composites microspheres were fabricated by a novel and facile approach, exhibiting excellent catalytic performance in oxidative degradation.

Copper nanoparticles socketed in situ into copper phyllosilicate nanotubes with enhanced performance for chemoselective hydrogenation of esters

2017 ◽  
Vol 53 (51) ◽  
pp. 6933-6936 ◽  
Author(s):  
Xiaoxiao Gong ◽  
Meiling Wang ◽  
Huihuang Fang ◽  
Xiaoqi Qian ◽  
Linmin Ye ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Selective Hydrogenation ◽  
Elevated Temperatures ◽  
Catalytic Performance ◽  
Reducing Atmosphere ◽  
Chemoselective Hydrogenation ◽  
Excellent Catalytic Performance

Copper nanoparticles exsoluted in situ under a reducing atmosphere at elevated temperatures are socketed into the parent copper phyllosilicate nanotubes and exhibit excellent catalytic performance and superior stability for the selective hydrogenation of various esters to alcohols.

Hierarchical Cu2S nanorods with different crystal phases for asymmetrical supercapacitors and visible-light photocatalysis

2018 ◽  
Vol 47 (42) ◽  
pp. 15189-15196 ◽  
Author(s):  
Qun Liu ◽  
Xiaodan Hong ◽  
Xin Zhang ◽  
Xingyan You ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Catalytic Performance ◽  
Electrochemical Activity ◽  
Visible Light Photocatalysis ◽  
Hexagonal Crystal ◽  
Crystal Phases ◽  
Excellent Catalytic Performance

Hierarchical structured Cu2S nanorods with monoclinic and hexagonal crystal phases are in situ grown on copper sheets, showing remarkable electrochemical activity in supercapacitors and excellent catalytic performance in photocatalysis.

Uniform Ni/SiO2@Au magnetic hollow microspheres: rational design and excellent catalytic performance in 4-nitrophenol reduction

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 7025-7032 ◽  
Author(s):  
Shenghuan Zhang ◽  
Shili Gai ◽  
Fei He ◽  
Yunlu Dai ◽  
Peng Gao ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Rational Design ◽  
Au Nanoparticles ◽  
Catalytic Performance ◽  
Hollow Microspheres ◽  
Nitrophenol Reduction ◽  
Excellent Catalytic Performance

Uniform Ni/SiO2 magnetic hollow microspheres were prepared by an in situ thermal decomposition and reduction route. Tiny Au nanoparticles (5 nm) were linked to Ni/SiO2 microspheres. The as-prepared Ni/SiO2@Au catalysts exhibited excellent catalytic activity for 4-nitrophenol reduction.

In situ PMMA-templating preparation and excellent catalytic performance of Co3O4/3DOM La0.6Sr0.4CoO3 for toluene combustion

2013 ◽  
Vol 458 ◽  
pp. 11-20 ◽  
Author(s):  
Xinwei Li ◽  
Hongxing Dai ◽  
Jiguang Deng ◽  
Yuxi Liu ◽  
Zhenxuan Zhao ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Excellent Catalytic Performance

A Smart Hydrothermal Synthesis for Cobble-Like Porous CeO2 and their Superior Catalytic Performance for NH3-SCR of NOx

2017 ◽  
Vol 50 ◽  
pp. 72-77
Author(s):  
Xiao Fei Niu ◽  
Fu Rong Tu
Keyword(s):  
Oxygen Vacancies ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Hydrothermal Route ◽  
Surface Areas ◽  
Scr Of No ◽  
In Situ Drift ◽  
Cubic Structure ◽  
Excellent Catalytic Performance

The almost monodisperse cobble-like CeO2 nanostructures with many pores and a diameter of 50-100 nm have been successfully synthesized by a smart hydrothermal route. XRD, SEM, XPS, BET, and in situ DRIFT were employed to characterize the samples. The results showed that the cobble-like CeO2 owned a fluorite cubic structure and there are Ce3+ ions and oxygen vacancies in surface of samples. Its catalytic activity was investigated by selective catalytic reduction of NOx with NH3. The results showed that cobble-like CeO2 nanostructures exhibit excellent catalytic performance, which can be attributed to the much larger surface areas, novel morphology and the best redox behaviour of surface oxygen on the CeO2 surface.

scholarly journals Strategies for Surface Modification with Ag-Shaped Nanoparticles: Electrocatalytic Enhancement of Screen-Printed Electrodes for the Detection of Heavy Metals

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4249 ◽  
Author(s):  
Karina Torres-Rivero ◽  
Lourdes Torralba-Cadena ◽  
Alexandra Espriu-Gascon ◽  
Ignasi Casas ◽  
Julio Bastos-Arrieta ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Electrode Surface ◽  
Spin Coating ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Ag Nps ◽  
Electrocatalytic Effect ◽  
Anodic Stripping ◽  
Screen Printed

Screen-printed carbon nanofiber electrodes (SPCNFEs) represent an alternative with great acceptance due to their results, as well as their low impact on the environment. In order to improve their performance, in the present work they were modified with silver nanoparticles (Ag-NPs) and electrochemically characterized by using anodic stripping voltammetry. From the Ag-NP synthesis, silver seeds (Ag-NS) and silver nanoprisms (Ag-NPr) were obtained. The Ag-NP formation was confirmed by micrographs, where Ag-NPs with diameters of 12.20 ± 0.04 nm for Ag-NS and 20.40 ± 0.09 nm for Ag-NPr were observed. The electrodes were modified by using three different deposition methods—drop-casting, spin-coating, and in situ approaches—that offer different nanoparticle distribution and electrode modification times. It was observed that the last methodology showed a low amount of Ag-NS deposited on the electrode surface and deep alteration of this surface. Those facts suggest that the in situ synthesis methodology was not appropriate for the determination of heavy metals, and it was discarded. The incorporation of the nanoparticles by spin-coating and drop-casting strategies showed different spatial distribution on the electrode surface, as proved by scanning electron microscopy. The electrodes modified by these strategies were evaluated for the cadmium(II) and lead(II) detection using differential pulse anodic stripping voltammetry, obtaining detection limit values of 2.1 and 2.8 µg·L−1, respectively. The overall results showed that the incorporation route does not directly change the electrocatalytic effect of the nanoparticles, but the shape of these nanoparticles (spherical for seeds and triangular for prisms) has preferential electrocatalytic enhancement over Cd(II) or Pb(II).

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