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Yongchun Ye, Hua Yang, Haimin Zhang, Jinling Jiang
Ag2 CrO4 nanoparticles (10‒35 nm) were assembled onto LaFeO3 nanoparticles (20‒60 nm) via a facile chemical precipitation method to form novel Ag2 CrO4 -LaFeO3 heterojunction composite photocatalysts. The prepared Ag2 CrO4 -LaFeO3 composites were characterized by XRD, SEM, TEM, XPS, BET, UV-vis DRS, PL spectroscopy and EIS and photocurrent response. The TEM result clearly shows that Ag2 CrO4 particles are decorated onto LaFeO3 particles to form Ag2 CrO4 -LaFeO3 heterojunction. Compared to bare LaFeO3 , the 10%Ag2 CrO4 -LaFeO3 composite exhibits slightly increased BET specific surface area, increased photocurrent density, decreased charge-transfer resistance and decreased PL emission peaks...
October 19, 2018: Environmental Technology
Shikha Jain, Gaurav Bhanjana, Solmaz Heydarifard, Neeraj Dilbaghi, Mousa M Nazhad, Vanish Kumar, Ki-Hyun Kim, Sandeep Kumar
Filtration is a promising water treatment method to purify drinking water. To develop highly efficient drinking water filter paper, water-resistant cellulose foam paper with a high wet strength property was fabricated using diverse metal oxide (e.g., copper oxide (CuO), zinc oxide (ZnO), and silver oxide (Ag2 O)) nanoparticles. These nanoparticles were synthesized using the hydrothermal reaction method. Their morphological structures were studied using a field emission scanning electron microscope (FESEM). The presence of coated nanoparticles on the cellulose foam filter was verified by energy dispersive X-ray spectroscopy (EDX) methods...
December 15, 2018: Carbohydrate Polymers
Elanthamilan Elaiyappillai, Sakthivel Kogularasu, Shen-Ming Chen, Muthumariappan Akilarasan, Christy Ezhilarasi Joshua, Princy Merlin Johnson, M Ajmal Ali, Fahad M A Al-Hemaid, M S Elshikh
The present work describes the sensing application and supercapacitive behavior of silver oxide nanoparticles recovered from wastewater of photo film processing units via one-pot green sonochemical recovery process. The recovered silver oxide nanoparticles (Ag2 O NPs) were characterized by spectral techniques such as FT-IR, Raman, UV-Vis and analytical tools such as XRD, FE-SEM, TEM, EDX, XPS and BET. In view of Ag2 O NPs as electrode material with wide technological applications, the recovered Ag2 O NPs were examined for their sensing and supercapacitive behavior...
September 25, 2018: Ultrasonics Sonochemistry
Ken-Fa Cheng, Fu-Chu Yang, Kuo-Hui Wu, Xing-Ming Liu
Inorganic metal oxides Ag2 O, CuO and ZnO were examined using SEM, XRD, TGA and ICP spectroscopy to analyze their structures and physical properties in terms of resistance to germs and toxic chemicals. Zone of inhibition testing and the plate-counting method were used in this study to examine the antibacterial activities of the metal oxides against Gram-negative Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa), and Gram-positive Staphylococcus aureus (S. aureus) and Bacillus subtilis (B...
December 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
En Shi, Zhenlan Xu, Xiaoxia Zhang, Xuezhi Yang, Qian Liu, Hangjun Zhang, Andreas Wimmer, Lingxiangyu Li
Stability of silver sulfide nanoparticle (Ag2 S-NP) in the environment has recently drawn considerable attention since it is associated with environmental risk. Although the overestimated stability of Ag2 S-NP in aqueous solution has already been recognized, studies on transformation of Ag2 S-NP in environmental water are still very scarce. Here we reported that Ag2 S-NP could undergo dissolution by manganese(IV) oxide (MnO2 ), an important naturally occurring oxidant in the environment, even in environmental water, although the dissolved silver would probably be adsorbed onto the particles (>0...
September 22, 2018: Environmental Pollution
Meiqin Zheng, Hui Hu, Zhuoliang Ye, Qingming Huang, Xiaohui Chen
In this work, the adsorption desulfurization performance and adsorption diffusion study of B2 O3 modified Ag-CeOx /TiO2 -SiO2 adsorbent were investigated. The adsorption desulfurization performance was studied by batch and fixed bed tests. The homogeneous surface diffusion model (HSDM) was employed to investigate the adsorption and diffusion behavior of 4,6-dimethyldibenzothiophene (4,6-DMDBT) in diesel. It was found that the addition of B2 O3 promotes the dispersion of CeOx species and then further facilitates the dispersion and oxidation of Ag species resulting in higher adsorption desulfurization activity...
January 15, 2019: Journal of Hazardous Materials
Dasari Ayodhya, Guttena Veerabhadram
The construction of ternary semiconductor nanostructures has attracted much attention in photocatalysis by virtue of their tunable elemental composition and band structure. Here, ternary semiconductor ZnxAg1-xS (0 ≤ x ≤ 1) composites were successfully prepared by a simple and low-cost hydrothermal method without using any surfactant. Combined analyses using XRD, N2 sorption, SEM, TEM and UV-vis DRS revealed that the ternary composite semiconductor materials exhibited well-developed crystalline frameworks, large surface areas of 15-70 m2 g-1, sizes of 10-30 nm, and outstanding UV light absorption properties...
October 10, 2018: Photochemical & Photobiological Sciences
Peng Li, Zhun Bao, Guanghui Wang, Pengfei Xu, Xuegang Wang, Zhipeng Liu, Yadan Guo, Jing Deng, Weimin Zhang
The development of ultra-efficient, sustainable, and easily accessible anode with relative non-precious semiconducting metal oxides is highly significant for application in the practical treatment of organically polluted water. Herein, we report SnO2 , TiO2 , and Ag2 O ternary semiconductor metal oxide blend grafted Ag@AgCl hybrids, prepared with the one-step sol-gel method and applied as a dimensionally stable anode (DSA)-active layer on a SnO2 -Sb/Ti electrode. Factors affecting crystal formation, including the presence or absence of O2 during calcination, the calcination temperature, and Ag@AgCl additive dosage were discussed...
January 15, 2019: Journal of Hazardous Materials
Hongyan Rong, Shikha Garg, T David Waite
The engineered silver nanoparticles (AgNPs) used in consumer products are ultimately released to the environment either as Ag(0), silver sulfide (Ag2 S(s)), silver chloride (AgCl(s)), and/or dissolved Ag(I) complexes. Of these, AgCl(s) and Ag2 S(s) exhibit semiconducting properties and hence may have significant implications to oxidant generation and subsequent redox transformations in natural waters. In this work, we investigate the transformation and photoreactivity of AgCl(s) under simulated natural water conditions with the photoreactivity probed by measuring the oxidation of formate (HCOO- ), a simple compound with a well-defined oxidation pathway...
October 3, 2018: Environmental Science & Technology
Nisha Bhardwaj, Bikash Kumar, Komal Agarwal, Venkatesh Chaturvedi, Pradeep Verma
Xylooligosaccharides (XOS) from lignocellulosic biomass (LCB) have found widespread applications in food, feed, nutraceuticals and pharamecutical industries. Enzymatic degradation of LCB for generation of XOS have gained impetus in recent times In the present investigation an extracellular thermo-alkali stable xylanase from Aspergillus oryzae LC1 was purified by using PEG 8000/MgSO4 aqueous two-phase system and was capable of hydrolysing various agricultural residues into XOS system. Highest activity was observed using 11...
September 15, 2018: International Journal of Biological Macromolecules
Biyao Wu, Yanguang Zhou, Ming Hu
A recent experiment [ J. Mater. Chem. A 2015 , 3 , 10303 ] has proved that superionic Ag2 Te can achieve a figure of merit as high as 1.39 due to its extremely low thermal conductivity. However, the traditional lattice vibration concept, i.e., phonons regarded as heat carriers, fails to explain the governing mechanism in such structures where anions vibrate around their equilibrium positions while cations flow like a liquid. As a result, the underlying physics for thermal transport properties in superionic Ag2 Te is still a mystery...
October 4, 2018: Journal of Physical Chemistry Letters
Zhenli Qiu, Jian Shu, Dianping Tang
An innovative near-infrared (NIR) light-driven photoelectrochemical (PEC) aptasensor was constructed for sensitive screening of carcinoembryonic antigen (CEA) on the basis of in situ formation of Ag2 S nanoparticles on the NaYF4 :Yb,Er upconversion nanoparticles (UCNs), coupled with hybridization chain reaction (HCR) for the signal amplification. Utilization of UCN as the light nanotransducer could convert the NIR light into an applicable wavelength harvested by semiconductors. The multiemissions of NaYF4 :Yb,Er UCN could match well with the absorption characteristics of Ag2 S...
September 28, 2018: Analytical Chemistry
Tingting Zhang, Xianli Su, Junjie Li, Zhi Li, Yonggao Yan, Wei Liu, Xinfeng Tang
This work shows that the thermoelectric properties of Cr2 Se3 material are improved by doping with Ag. The influence of doping with Ag on the phase composition, microstructure, and thermoelectric properties of Ag2 x Cr2-2 x Se3 ( x = 0-0.02) compounds was thoroughly investigated. Ag atoms prefer to occupy the 6c Wyckoff position of the space group, accompanied expansion of the lattice and distortion of the octahedral structure units. The electrical conductivity increases at elevated temperature, while the lattice thermal conductivity decreases significantly through Ag doping, which is primarily attributed to the distorted structure and enhanced alloy scattering...
October 1, 2018: Inorganic Chemistry
Xiaotong Chen, Junjie Zhao, Xiuxia Xu, Kai Ren, Xue Luo, Xinwen Sun, Xvsheng Qiao, Xianping Fan, Guodong Qian, Gaorong Han
By adjusting the content of ZnF2 -SrF2 /ZnO-SrO, a series of SiO2 -Al2 O3 -B2 O3 -Na2 O-ZnO/ZnF2 -SrO/SrF2 -Ag multiphase glasses was designed and prepared via a melt-quenching method. Under a phase separation strategy, negatively charged tetrahedrons ([BO4 ]- , [ZnO4 ]2- , and [AlO4 ]- ) can be generated to stabilize different silver species (Ag+ ions; [Ag2 ]2+ pairs; [Agm ]n+ quantum clusters ([Agm ]n+ QCs)) in B2 O3 -rich and ZnO-Al2 O3 rich sub-phases. The B2 O3 -rich sub-phase has a high solubility for Ag+ ions and [Agm ]n+ QCs...
October 7, 2018: Physical Chemistry Chemical Physics: PCCP
Siqi Zhang, Liang Zhao
Macrocyclic ligands have been extensively applied to recognize single metal ions with high selectivity and good affinity based on the size-match principle. The resulting metal-macrocycle complexes play a significant role in mimicking the function of natural metal ion carriers and understanding and reproducing the catalytic activity of metalloenzymes. Because of the known macrocyclic effect, those single metal-macrocycle adducts often show an enhanced kinetic and thermodynamic stability in comparison with their open-chain analogues...
September 10, 2018: Accounts of Chemical Research
Jessica C Hsu, Pratap C Naha, Kristen C Lau, Peter Chhour, Renee Hastings, Brianna F Moon, Joel M Stein, Walter R T Witschey, Elizabeth S McDonald, Andrew D A Maidment, David P Cormode
Conventional X-ray mammography has low diagnostic sensitivity for women with dense breasts. As a result, alternative contrast-enhanced screening tools such as dual energy mammography (DEM), computed tomography (CT), magnetic resonance imaging (MRI), and near-infrared fluorescence (NIRF) imaging are being used or investigated for these women. However, currently available contrast agents are non-ideal, have safety issues, and each imaging technique requires a different contrast agent. We therefore sought to develop a multimodal contrast agent that is functional for each breast imaging modality to simplify the diagnosis process and address the issues of existing contrast agents...
September 20, 2018: Nanoscale
Christian A Juillerat, Emily E Moore, Gregory Morrison, Mark D Smith, Theodore Besmann, Hans-Conrad Zur Loye
Single crystals of 13 new uranyl germanate salt-inclusion materials were grown from alkali halide fluxes: [Cs2 Cs5 F][(UO2 )3 (Ge2 O7 )2 ] (1), [Cs6 Ag2 Cl2 ][(UO2 )3 (Ge2 O7 )2 ] (2), [Cs6 Ag0.3 Na1.7 Cl2 ][(UO2 )3 (Ge2 O7 )2 ] (3), [Cs6 Ag0.4 Na1.6 Cl2 ][(UO2 )3 (Ge2 O7 )2 ] (4), [Cs6 K2 Cl2 ][(UO2 )3 (Ge2 O7 )2 ] (5), [Cs6 K1.9 Ag0.1 Cl2 ][(UO2 )3 (Ge2 O7 )2 ] (6), [KK6 Cl][(UO2 )3 (Ge2 O7 )2 ] (7), [KK6 Br0.6 F0.4 ][(UO2 )3 (Ge2 O7 )2 ] (8), [Na0.9 Rb6.1 F][(UO2 )3 (Ge2 O7 )2 ] (9), [K0.6 Na0.4 K5 CsCl0...
September 17, 2018: Inorganic Chemistry
Sanaz Alizadeh, Subhasis Ghoshal, Yves Comeau
Municipal water resource recovery facilities are the primary recipients of a significant fraction of discharged silver nanoparticle (AgNP)-containing wastes, yet the fate and potential risks of AgNPs in attached-growth biological wastewater treatment processes are poorly understood. The fate and inhibitory effects of polyvinylpyrrolidone (PVP)-coated AgNPs at environmentally-relevant nominal concentrations (10, 100, 600 μg/L) were investigated, for the first time, in high rate moving bed biofilm reactors (MBBRs) for soluble organic matter removal...
January 10, 2019: Science of the Total Environment
Kenji Nomiya, Soichiro Morozumi, Yuki Yanagawa, Misa Hasegawa, Kaori Kurose, Kenshiro Taguchi, Ryosuke Sakamoto, Kohei Mihara, Noriko Chikaraishi Kasuga
Novel dinuclear gold(I)- and copper(I)- N-heterocyclic carbene (NHC, L-1a) complexes [M2 (L-1a)](PF6 )2 (M = AuI (Au-1·PF6 ) and M = CuI (Cu-1·PF6 )) were synthesized by transmetalation of the dinuclear silver(I)-NHC complex [Ag2 (L-1a)](PF6 )2 (Ag-1·PF6 ) with [AuCl(Me2 S)] or CuI in over 70% yield. These NHC complexes were characterized by CHN elemental analysis, Fourier transform infrared spectroscopy, thermogravimetry/differential thermal analysis, and solution (1 H and 13 C) NMR spectroscopy. X-ray crystallography revealed that Au-1·PF6 and Cu-1·PF6 are dinuclear molecules consisting of two linear intramolecular C-M-C bonds (M = AuI and CuI ), one M···M interaction, and two metal atoms arranged in a T-shaped geometry; their molecular structures are very similar to the basket-shaped cage structure of the parent complex Ag-1·PF6 ...
September 17, 2018: Inorganic Chemistry
Ying Zhang, Ning Zhao, Yeshan Qin, Fengxia Wu, Zhihua Xu, Tian Lan, Zhen Cheng, Ping Zhao, Hongguang Liu
Photoacoustic imaging (PAI) is a new and attractive imaging modality, and it has strong potential for application in the early detection of tumors through the use of optically absorbing targeted contrast agents. Ag2S quantum dots (QD) are a promising bionanomaterial and have attracted significant attention in the field of bioimaging. In this study, water-soluble and carboxylic acid group-coated Ag2S QDs with an ultrasmall size (∼8 nm) were synthesized via a one-step method. Their surface plasmon resonance wavelength was determined to be ∼800 nm, which is ideal for PAI...
September 13, 2018: Nanoscale
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