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Min Cheng, Guangming Zeng, Danlian Huang, Cui Lai, Yang Liu, Chen Zhang, Jia Wan, Liang Hu, Chengyun Zhou, Weiping Xiong
The presence of antibiotics in aquatic environments has attracted global concern. Fenton process is an attractive yet challenging method for antibiotics degradation, especially when such a reaction can be conducted at neutral pH values. In this study, a novel composite Fe/Co catalyst was synthesized via the modification of steel converter slag (SCS) by salicylic acid-methanol (SAM) and cobalt nitrate (Co(NO3 )2 ). The catalysts were characterized by N2 -Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS)...
March 10, 2018: Water Research
Meng Tian, Yu Long, Dan Xu, Shuoyun Wei, Zhengping Dong
Nowadays, chemical catalytic methods for the treatment of organic wastes are attracting more and more research attention. In the current research, novel catalysts with palladium nanoparticles (Pd NPs) supported on the hollow mesoporous silica nanotubes (h-mSiO2 ) were synthesized for the catalytic reduction of 4-nitrophenol (4-NP) and hydrodechlorination (HDC) of 4-chlorophenol (4-CP). The key point for the fabrication of the catalysts is that a certain thickness of the silica shell was wrapped on the multiwalled carbon nanotubes (MWNTs) or Pd/MWNTs through biphase stratification approach, and then the samples were calcined to remove the MWNTs...
March 14, 2018: Journal of Colloid and Interface Science
Zhulan Gu, Shumin Li, Zhiping Xiong, Hui Xu, Fei Gao, Yukou Du
Bimetallic nanocatalysts with small particle size benefit from markedly enhanced electrocatalytic activity and stability during small molecule oxidation. Herein, we report a facile method to synthesize binary Pt-Ru nanoparticles dispersed on a carbon support at an optimum temperature. Because of its monodispersed nanostructure, synergistic effects were observed between Pt and Ru and the PtRu/C electrocatalysts showed remarkably enhanced electrocatalytic activity towards ethanol oxidation. The peak current density of the Pt1 Ru1 /C electrocatalyst is 3731 mA mg-1 , which is 9...
March 13, 2018: Journal of Colloid and Interface Science
Aziza Hadj Ltaïef, Simona Sabatino, Federica Proietto, Salah Ammar, Abdellatif Gadri, Alessandro Galia, Onofrio Scialdone
The treatment of toxic organic pollutants by electro-Fenton (EF) presents some drawbacks such as the necessity to work at low pH and the low solubility of oxygen in water contacted with air or oxygen at room pressure that results often in slow and relatively low abatements. Here, the coupled adoption of natural heterogeneous catalysts and of relatively high pressure was proposed in order to improve the performances of EF for the treatment of organic pollutants. Caffeic acid (CA) and 3-chlorophenol were used as model resistant organic pollutants...
March 12, 2018: Chemosphere
Andrea Knöller, Stefan Kilper, Achim Diem, Marc Widenmeyer, Tomce Runcevski, Robert E Dinnebier, Joachim Bill, Zaklina Burghard
The demand to outperform current technologies pushes scientists to develop novel strategies to enable fabricating materials with exceptional properties. Along this line, lightweight structural materials are of great interest due to their versatile applicability as sensors, catalysts, battery electrodes and acoustic or mechanical dampers. Here we report a strategy to design ultralight (ρ = 3 mg/cm3) and hierarchically structured ceramic scaffolds of macroscopic size. Such scaffolds exhibit mechanical reversibility comparable to that of microscopic metamaterials, leading to a macroscopically remarkable dynamic mechanical performance...
March 20, 2018: Nano Letters
Sebastian Benz, Amalia I Poblador-Bahamonde, Nicolas Low-Ders, Stefan Matile
Halogen- and chalcogen-based σ-hole interactions have recently received increased interest in non-covalent organocatalysis. However, the closely related pnictogen bonds have been neglected. In this study, we introduce conceptually simple, neutral, and monodentate pnictogen-bonding catalysts. Solution and in silico binding studies, together with high catalytic activity in chloride abstraction reactions, yield compelling evidence for operational pnictogen bonds. The depth of the σ holes is easily varied with different substituents...
March 20, 2018: Angewandte Chemie
Hiromu Fuse, Masahiro Kojima, Harunobu Mitsunuma, Motomu Kanai
A hybrid catalysis that comprises an acridinium photoredox catalyst, a thiophosphate organocatalyst, and a nickel catalyst-enabled acceptorless dehydrogenation of hydrocarbons is reported. The cationic nickel complex played a critical role in the reactivity. This is the first example of acceptorless dehydrogenation of hydrocarbons by base metal catalysis under mild reaction conditions of visible light irradiation at room temperature.
March 20, 2018: Organic Letters
Sanjay Maity, Suman Sar, Prasanta Ghorai
An enantioselective synthesis of Rauhut-Currier (RC) adducts from 3-aryl cyclohexenone with a tethered enone moiety at the ortho-position on the aryl group is accomplished. This method provides a wide range of valuable synthetic building blocks having a unique [6-5-6] all-carbon-fused tricyclic skeleton. A primary amine-containing thiourea, a bifunctional organocatalyst, was found to be an efficient catalyst for this transformation. The primary amine counterpart of the catalyst possibly activates the aliphatic enone via dienamine formation (HOMO activation), whereas the thiourea counterpart activates the tethered enone (LUMO activation)...
March 20, 2018: Organic Letters
Pola Shriber, Atanu Samanta, Gilbert Daniel Nessim, Ilya Grinberg
Black phosphorus (BP) is a layered semiconductor with outstanding properties, making it a promising candidate for optoelectronic and other applications. BP synthesis is an intriguing task, largely due to the insufficient understanding of the synthesis mechanism. In this work, we use density functional theory calculations to examine BP, and its precursor red phosphorus, as they are formed from P4 building blocks. Our results suggest that, without external effects such as pressure or addition of a catalyst, the precursor is energetically favored in the initial steps of the synthesis, even though BP is the more stable allotrope...
March 20, 2018: Journal of Physical Chemistry Letters
Lan Hui, Dianzeng Jia, Huidi Yu, Yurui Xue, Yuliang Li
We employed a two-step strategy for preparing ultrathin graphdiyne-wrapped iron carbonate hydroxide nanosheets on nickel foam (FeCH@GDY/NF) as the efficient catalysts toward the electrical splitting water. The introduction of naturally porous GDY nanolayers on FeCH surface endows the pristine catalyst with structural advantages for boosting catalytic performances. Benefited from the protection of robust GDY nanolayers with intimate contact between GDY and FeCH, the combined material exhibits high long-term durability of 10 000 cycles for oxygen-evolution reaction (OER) and 9000 cycles for hydrogen evolution reaction (HER) in 1...
March 20, 2018: ACS Applied Materials & Interfaces
Min Zhou, Qunhong Weng, Zakhar I Popov, Yijun Yang, Liubov Yu Antipina, Pavel B Sorokin, Xi Wang, Yoshio Bando, Dmitri Golberg
Electrocatalytic hydrogen evolution reaction (HER) in alkaline solution is hindered by its sluggish kinetics toward water dissociation. Nickel-based catalysts, as low-cost and effective candidates, show great potentials to replace platinum (Pt)-based materials in the alkaline media. The main challenge regarding this type of catalysts is their relatively poor durability. In this work, we conceive and construct a charge-polarized carbon layer derived from carbon quantum dots (CQDs) on Ni3 N nanostructure (Ni3 N@CQDs) surfaces, which simultaneously exhibit durable and enhanced catalytic activity...
March 20, 2018: ACS Nano
Guozhu Chen, Yong Wang, Yunwei Wei, Wei Zhao, Daowei Gao, Hongxiao Yang, Cuncheng Li
Noble metal nanoparticle based catalysts are widely used for the removal of hazardous materials. During the catalytic reactions, it is of particular importance for developing novel strategies to avoid the leaching or sintering of noble metal nanoparticles. Here, the 4-nitrophenol (4-NP) and CO, typical hazardous chemicals in industrial water and exhaust gases from vehicles, are studied for their removal using CeO2@Au@CeO2-MnO2 catalyst. The sandwich hollow structure is achieved by means of successive interfacial redox reaction without any surfactants and involving any surface modifications...
March 20, 2018: ACS Applied Materials & Interfaces
Fen Qiu, René H J Vervuurt, Marcel A Verheijen, Edmond W Zaia, Erin B Creel, Youngsang Kim, Jeffrey J Urban, Ageeth A Bol
Supported catalysts are widely used in industry and can be optimized by tuning the composition, chemical structure, and interface of the nanoparticle catalyst and oxide support. Here we firstly combine a bottom up colloidal synthesis method with a top down atomic layer deposition (ALD) process to achieve a raspberry-like Pt-decorated Fe3O4 (Fe3O4-Pt) nanoparticle superlattices. This nanocomposite ensures the precision of the catalyst/support interface, improving the catalytic efficiency of the Fe3O4-Pt nanocomposite system...
March 20, 2018: Nanoscale
Weitong Cai, Yuanzheng Yang, Pingjun Tao, Liuzhang Ouyang, Hui Wang
Nanosized metal borides MBx (M = Mg, Ti, Fe, Si) are found to play an important role in enhancing the hydrogen storage performance of LiBH4 in this work. The hydrogen storage behavior and mechanism of these modified systems are investigated through TPD-MS, XRD, FTIR and SEM characterization methods. By introducing these metal borides into LiBH4 through ball milling, the systems display three dehydrogenation stages disclosing their similarity and distinction. The 1st stage starts at 190 °C, the 2nd stage ranges from 280 °C to 400 °C and the 3rd stage ends at 550 °C with a peak at round 440 °C similar to that of pristine LiBH4...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Igor E Soshnikov, Nina V Semikolenova, Konstantin P Bryliakov, Artem A Antonov, Vladimir A Zakharov, Evgenii P Talsi
The nature of Ni(ii) species formed upon the activation of the Brookhart's α-diimine polymerization pre-catalyst LNiBr2 with MAO and MMAO (L = 1,4-bis-2,4,6-dimethylphenyl-2,3-dimethyl-1,4-diazabuta-1,3-diene) has been established using 1H and 13C NMR spectroscopy. The heterobinuclear ion pair [LNiII(μ-Me)2AlMe2]+[MeMAO]- is observed at the initial stage of the reaction of LNiBr2 with MAO at -40 °C, whereas the ion pair [LNiII-tBu]+[MeMMAO]- predominates at the initial stage of the reaction of LNiBr2 with MMAO under the same conditions...
March 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Abir Goswami, Susnata Pramanik, Michael Schmittel
A catalytically active three-component nanorotor is reversibly self-assembled and disassembled by remote control. When zinc(ii) ions (2 equiv.) are added as an external chemical trigger to the mixture of transmitter [Cu(1)]+ and pre-rotor assembly [(S)·(R)], two equiv. of copper(i) ions translocate from [Cu(1)]+ to the two phenanthroline sites of [(S)·(R)]. As a result, [Zn(1)]2+ forms along with the three-component assembly [Cu2(S)(R)]2+, which is both a nanorotor (k298 = 46 kHz, ΔH‡ = 49.1 ± 0.4 kJ mol-1, ΔS‡ = 9...
March 20, 2018: Chemical Communications: Chem Comm
Hamidreza Arandiyan, Yuan Wang, Hongyu Sun, Mehran Rezaei, Hongxing Dai
This feature article summarizes the recent progress in porous perovskite oxides as advanced catalysts for both energy conversion applications and various heterogeneous reactions. Recently, research has been focused on specifically designing porous perovskite materials so that large surface areas can be harnessed and surface properties can be improved. Numerous potential applications of porous perovskites have been investigated, including heterogeneous catalysis and air battery applications that rely on interactions and/or reactions of other components with porous perovskites...
March 20, 2018: Chemical Communications: Chem Comm
Manuel Iglesias, Luis A Oro
This review summarises the most recent advances in Ir-NHC catalysis while revisiting all the classical reactions in which this type of catalyst has proved to be active. The influence of the ligand system and, in particular, the impact of the NHC ligand on the activity and selectivity of the reaction have been analysed, accompanied by an examination of the great variety of catalytic cycles hitherto reported. The reaction mechanisms so far proposed are described and commented on for each individual process. Moreover, some general considerations that attempt to explain the influence of the NHC from a mechanistic viewpoint are presented at the end of the review...
March 20, 2018: Chemical Society Reviews
Mohan P Joshi, Chifumbe Chintu, Mirfin Mpundu, Dan Kibuule, Oliver Hazemba, Tenaw Andualem, Martha Embrey, Bayobuya Phulu, Heran Gerba
The multi-faceted complexities of antimicrobial resistance (AMR) require consistent action, a multidisciplinary approach, and long-term political commitment. Building coalitions can amplify stakeholder efforts to carry out effective AMR prevention and control strategies. We have developed and implemented an approach to help local stakeholders kick-start the coalition-building process. The five-step process is to (1) mobilise support, (2) understand the local situation, (3) develop an action plan, (4) implement the plan, and (5) monitor and evaluate...
March 20, 2018: Global Public Health
Dunia E Santiago, Luisa M Pastrana-Martínez, Elisenda Pulido-Melián, Javier Araña, Joaquim L Faria, Adrián M T Silva, Óscar González-Díaz, José M Doña-Rodríguez
Magnetite (Fe3 O4 ), a core-shell material (SiO2 @Fe3 O4 ), and reduced graphene oxide-Fe3 O4 (referred as rGO-MN) were used as supports of a specific highly active TiO2 photocatalyst. Thermal treatments at 200 or 450 °C, different atmospheres (air or N2 ), and TiO2 :support weight ratios (1.0, 1.5, or 2.0) were investigated. X-ray diffractograms revealed that magnetite is not oxidized to hematite when the core-shell SiO2 @Fe3 O4 material-or a N2 atmosphere (instead of air) in the thermal treatment-was employed to prepare the TiO2 -based catalysts (the magnetic properties being preserved)...
March 2, 2018: Environmental Science and Pollution Research International
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