scholarly journals Fast Degradation of Bisphenol A in Water by Nanostructured CuNPs@CALB Biohybrid Catalysts

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 7 ◽  
Author(s):  
Noelia Losada-Garcia ◽  
Alba Rodriguez-Otero ◽  
Jose M. Palomo
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Bisphenol A ◽  
Copper Nanoparticles ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Cu2o Nanoparticles ◽  
Nanoparticle Sizes ◽  
Excellent Catalytic Performance ◽  
Excellent Stability

Copper nanoparticles–enzyme biohybrid is a promising material for the remediation of contaminated waters, but its function is influenced by its effect on degradation organic pollutants. This study is the first investigation into the fast degradation of a high amount of Bisphenol A (BPA) in water at neutral pH and room temperature. Four different CuNPs biohybrids with different cu species and nanoparticle sizes were used as catalysts. The biohybrid CuNPs@CALB-3, which contained Cu2O nanoparticles of around 10 nm size, showed excellent catalytic performance removing >95% BPA content (45 ppm) in an aqueous solution in 20 min in the presence of hydrogen peroxide at pH 8 using 1.5 g/L of a catalyst. The catalyst showed excellent stability and recyclability at these conditions.

scholarly journals High Degradation of Trichloroethylene in Water by Nanostructured MeNPs@CALB Biohybrid Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 753
Author(s):  
Noelia Losada-Garcia ◽  
Alba Rodriguez-Otero ◽  
Jose M. Palomo
Keyword(s):  
Room Temperature ◽  
Catalytic Performance ◽  
Metal Species ◽  
Cu2o Nanoparticles ◽  
Degradation Reaction ◽  
Tce Degradation ◽  
Nanoparticle Sizes ◽  
By Products ◽  
Excellent Catalytic Performance ◽  
Excellent Stability

In this study, a methodology was developed for the rapid degradation of trichloroethylene (TCE) and 1,1-dichloroethylene (1,1-DCE) in distilled water and room temperature without the production of toxic chlorinated by-products. This process was carried out using bionanohybrids of different metals (Pd, Fe, Cu and Zn) obtained by enzyme–metal coordination called MeNPs@CALB, which present different metal species and nanoparticle sizes. The Cu2O@CALB biohybrid, which contained Cu2O nanoparticles, showed excellent catalytic performance in TCE degradation by removing 95% (>125 ppm) in 10 min using 1.5 g/L of catalyst. On the other hand, in the degradation reaction of 1,1-DCE, Cu2O@CALB eliminated 94% (93 ppm) in 1 min. Cu2O@CALB exhibited excellent stability and recyclability under sustainable conditions, maintaining its effectiveness in more than 90% for three cycles.

scholarly journals Ultra-Fast Degradation of p-Aminophenol by a Nanostructured Iron Catalyst

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2166 ◽  
Author(s):  
Rocio Benavente ◽  
David Lopez-Tejedor ◽  
Carlos Perez-Rizquez ◽  
Jose Palomo
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Room Temperature ◽  
Iron Catalyst ◽  
Catalytic Performance ◽  
Environmental Pollutant ◽  
Optimal Conditions ◽  
Mentha X Piperita ◽  
Liquid Extract

Full degradation of p-aminophenol in aqueous solution at room temperature by using a heterogeneous nanostructured iron hybrid catalyst in the presence of hydrogen peroxide is described. A nanostructured iron catalyst was prepared by in situ formation of iron carbonate nanorods on the protein network using an aqueous solution of an enzyme, lipase B from Candida antarctica (CAL-B). A second kind of iron nanostructured catalyst was obtained by the sunsequent treatment of the hybrid with an aqueous liquid extract of Mentha x piperita. Remarkable differences were observed using TEM imaging. When M. piperita extract was used, nanoparticles appeared instead of nanorods. Catalytic activity of these iron nanocatalysts was studied in the degradation of the environmental pollutant p-aminophenol (pAP) under different operating parameters, such as pH, presence of buffer or hydrogen peroxide concentration. Optimal conditions were pH 4 in acetate buffer 10 mM containing 1% (v/v) H2O2 for FeCO3NRs@CALB, while for FeCO3NRs@CALB-Mentha, water containing 1% (v/v) H2O2, resulted the best. A complete degradation of 100 ppm of pAP was achieved in 2 and 3 min respectively using 1 g Fe/L. This novel nanocatalyst was recycled five times maintaining full catalytic performance.

scholarly journals Catalysis of Organic Pollutants Abatement Based on Pt-Decorated Ag@Cu2O Heterostructures

Molecules ◽  
2019 ◽  
Vol 24 (15) ◽  
pp. 2721
Author(s):  
Xiaolong Zhang ◽  
Bingbing Han ◽  
Yaxin Wang ◽  
Yang Liu ◽  
Lei Chen ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Structural Characteristics ◽  
Organic Pollutant ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Pt Nanoparticle ◽  
Local Surface ◽  
Local Surface Plasmon Resonance ◽  
Cu2o Nanoparticles ◽  
Excellent Catalytic Performance

Pt-decorated Ag@Cu2O heterostructures were successfully synthesized using a simple and convenient method. The Pt nanoparticle density on the Ag@Cu2O can be controlled by changing the concentration of the Pt precursor. The synthesized Ag@Cu2O–Pt nanoparticles exhibited excellent catalytic performance, which was greatly affected by changes in the Ag@Cu2O–Pt structure. To optimize the material’s properties, the synthesized Ag@Cu2O–Pt nanoparticles were used to catalyze toxic pollutants and methyl orange (MO), and nontoxic products were obtained by catalytic reduction. The Pt-decorated Ag@Cu2O nanoparticles showed excellent catalytic activity, which significantly decreased the pollutant concentration when the nanoparticles were used for catalytic reduction. The redistribution of charge transfer is the nanoparticles’ main contribution to the catalytic degradation of an organic pollutant. This Pt-decorated Ag@Cu2O material has unique optical and structural characteristics that make it suitable for photocatalysis, local surface plasmon resonance, and peroxide catalysis.

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.

scholarly journals Tailorable Aqueous-Media Synthesis of Heterogeneous Copper Nanoparticles Hybrids and Application in Selective Oxidation of Benzene

2019 ◽  
Author(s):  
Noelia Losada-Garcia ◽  
Alba Rodriguez-Otero ◽  
Jose M Palomo
Keyword(s):  
Hydrogen Peroxide ◽  
Selective Oxidation ◽  
Copper Nanoparticles ◽  
Room Temperature ◽  
Aqueous Media ◽  
Green Technology ◽  
Direct Oxidation ◽  
Experimental Conditions ◽  
Copper Species ◽  
Oxidation Of Benzene

Novel heterogeneous nanocatalysts has been synthesized in aqueous media at multimilligram scale for highly selective direct oxidation of benzene to phenol in aqueous media. The synthesis of a novel biohybrids containing copper nanoparticles (CuNPs) by an efficient and green technology have been described. The methodology involves the combination of an enzyme and a copper salt in aqueous media at room temperature. It was possible to control the copper species and nanoparticle size depending on the experimental conditions, e.g. pH, reducing step, amount of enzyme, obtaining novel heterogeneous nanobiohybrids containing exclusively Cu (0)NPs, Cu2O (Cu(i)) NPs or very crystalline Cu3(PO4)2 (Cu (ii)) NPs. Very small dispersed copper nanoparticles were formed in all cases (from 3 to 15 nm). These novel CuNPs biohybrids were evaluated as catalyst in the selective oxidation of benzene to phenol in water at 30ºC using hydrogen peroxide as oxidant, obtaining excellent yields and selectivity of phenol (>80% yield, >95% selectivity). <br>

scholarly journals Controllable Synthesis and Catalytic Performance of Gold Nanoparticles with Cucurbit[n]urils (n = 5–8)

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1015 ◽  
Author(s):  
Liangfeng Zhang ◽  
Simin Liu ◽  
Yuhua Wang ◽  
Haijun Zhang ◽  
Feng Liang
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Direct Relationship ◽  
Surface Coverage ◽  
Catalytic Performance ◽  
Ring Size ◽  
Controllable Synthesis ◽  
New Applications ◽  
Nanoparticle Sizes

A series of gold nanoparticles (AuNPs) was prepared in situ with different cucurbit[n]urils (CB[n]s) in an alkaline aqueous solution. The nanoparticle sizes can be well controlled by CB[n]s (n = 5, 6, 7, 8) with different ring sizes. The packing densities of CB[5–8] and free surface area on AuNPs were determined. A direct relationship was found between the ring size and packing density of CB[n]s with respect to the AuNP-catalyzed reduction of 4-nitrophenol in the presence of NaBH4. The larger particle size and higher surface coverage of bigger CB[n]-capped AuNPs significantly decreased the catalytic activity. Furthermore, this work could lead to new applications that utilize AuNPs under an overlayer of CB[n]s for catalysis, sensing, and drug delivery.

scholarly journals Nanochannel-based heterometallic {ZnIIHoIII}–organic framework with high catalytic activity for the chemical fixation of CO2

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9731-9739
Author(s):  
Tao Zhang ◽  
Hongtai Chen ◽  
Hongxiao Lv ◽  
Qiaoling Li ◽  
Xiutang Zhang
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Chemical Fixation ◽  
Efficient Detection ◽  
Honeycomb Material ◽  
Excellent Catalytic Performance ◽  
Organic Framework

The robust, double-walled, honeycomb material {[ZnHo(TDP)(H2O)]·2DMF·4H2O}n exhibits an excellent catalytic performance in the chemical fixation of CO2 and the efficient detection of Fe(iii) ions in aqueous solution.

A fast and mild method to prepare d-Ti3C2Tx/ZnO composites at room temperature with excellent catalytic performance

2021 ◽  
Vol 558 ◽  
pp. 149863
Author(s):  
Jing Lv ◽  
Libo Zhang ◽  
Li Zhu ◽  
Feng Wang ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Catalytic Performance ◽  
Excellent Catalytic Performance

Spheres-on-sphere silica microspheres as matrix for horseradish peroxidase immobilization and detection of hydrogen peroxide

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38665-38672 ◽  
Author(s):  
Zhen Lei ◽  
Xia Liu ◽  
Lina Ma ◽  
Dianjun Liu ◽  
Haifei Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Horseradish Peroxidase ◽  
Catalytic Performance ◽  
Silica Microspheres ◽  
Excellent Catalytic Performance

Spheres-on-sphere (SOS) silica microspheres are employed as a matrix for horseradish peroxidase (HRP) immobilization. The SOS-COOH-HRP shows excellent catalytic performance and stability.

Sign in / Sign up

Export Citation Format

Share Document