APPLIED CLAY SCIENCE
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2021
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IF 5.467
Atian Xie,Jiuyun Cui,Jin Yang,Chunxiang Li,Yi Wang,Jiangdong Dai
The effective treatment of oily wastewater is of great significance for the protection of the ecological environment and human health. Aiming to prepare a membrane with excellent antifouling properties, a new active antifouling carbon cloth@Ni-Co LDH/Ag (CC@LDH/Ag) membrane was reported here via in situ hydrothermal growth and followed photo-deposition methods. The effects of Ag deposition on self-cleaning ability and surface wettability of CC@LDH/Ag membrane were studied. The experimental results showed CC@LDH/Ag membrane is superhydrophilic/underwater superoleophobic, and exhibited high separation efficiency (>98.6%) and high flux (6551–22,050 L m −2 h −1 ) for different kinds of oil/water mixtures. Moreover, CC@LDH/Ag membrane also displayed excellent environmental and mechanical durability. Good self-cleaning ability enabled CC@LDH/Ag membrane to be separated at least 30 times, and still maintained high separation performance. The self-cleaning CC@LDH/Ag membrane may hold great application prospects in oily wastewater remediation.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yingjie Gao,Qi Zhao,Yunhe Li,Yuanqing Li,Jianfeng Gou,Xiuwen Cheng
Advanced Oxidation Processes (AOPs) play a critical role in the elimination of antibiotics, in which it is essential to explore an environmentally friendly, cheap and effective catalyst. In this study, Ag 2 O-g/eggshell catalyst had been synthesized in a simple strategy, combining with peroxymonosulfate (PMS) to simultaneous remove sulfamethoxazole (SMX). Then, physicochemical properties of catalyst were investigated by series of techniques. Results indicated the Ag species was featured with a spherical-like structure and homogeneously distributed on the surface of eggshell. In addition, Ag 2 O-Ag/eggshell exhibited high degradation efficiency of SMX by activation of PMS (94.6%) under the optimized conditions of 0.1 g•L −1 Ag 2 O-Ag/eggshell, 0.16 mM PMS, 10 mg•L −1 SMX and initial pH 6.42. Moreover, several parameters such as the dosage of catalyst, PMS and the effect of pH, co-existing anions, humic acid (HA) and water matrices on SMX degradation were systematically studied. Besides, scavenging experiments were conducted to distinguish the active radicals. Furthermore, to improve the reusability of powder Ag 2 O-Ag/eggshell, corresponding Microporous Filter Membrane had been synthesized. Subsequently, possible reaction mechanism was proposed. Consequently, these results revealed that the waste eggshell was considered as a promising supporting material for the metal catalyst for the catalytic degradation of antibiotics in water.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 12
·e5972
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IF 3.14
Huihui Song,Na Wang,Xiatong Shi,Hao Meng,Yide Han,Junbiao Wu,Junli Xu,Yan Xu,Ting Sun,Xia Zhang
Probing into the new heterostructure based on metal–organic frameworks (MOFs) and optimizing their photocatalytic efficiency under solar energy irradiation are one of hot topics in extending applications of MOFs in photocatalytic technology. Inspired by the excellent visible-light responses and photocatalytic activities of inorganic silver salts, in this work, we focused on the construction of hybrid photocatalysts involving Ag-MOF and silver cyanamide (Ag 2 NCN). Two opposite in situ synthesis routes were adopted, which are hydrothermally producing Ag-MOF in the presence of Ag 2 NCN (route A) or precipitating Ag 2 NCN in the existence of Ag-MOF (route B), and the mass ratio of Ag 2 NCN vs. Ag-MOF was optimized. The morphology and structure character show that the synthetic routes have no obvious influences on the crystal structure, but change the morphology and size of final hybrid photocatalysts. The photocatalytic degradation of Rhodamine B under simulated solar energy has been tested to evaluate the photocatalytic activities for resulting hybrids. Compared to single Ag-MOF and Ag 2 NCN, the enhanced photocatalytic rates are represented by the hybrids. The electrochemical analyses and the active species trapping experiments were conducted to clarify the photocatalytic mechanism for resulting hybrids. The good recycling photocatalytic results indicate the prospect applications of Ag-MOF based hybrid photocatalysts.
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 10
·1-12
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IF 2.132
Niu Zhiqiang,Liu Hongmei,Chen Ying,Gu Chenjie,Zhao Ziqi,Jiang Tao
Surface-enhanced Raman scattering (SERS) has been considered a high sensitivity, specificity, and ultra-fast analytical technique in molecular fingerprint recognition. Herein, a kind of sandwich Au/“star-like” mesoporous SiO 2 /Ag (Au/MSiO 2 /Ag) hybrid nanostructure was developed by implementing the electrostatic adsorption and magnetron sputtering technology for SERS application. In the experiment, the decoration density of the MSiO 2 /Ag nanostructure was conveniently adjusted through tuning the washing times of the silicon wafer in ethanol. The prepared substrate with the optimal geometry structure exhibited an enhancement factor (EF) of 9.2 × 10 5 , a limit of detection (LOD) of 5 × 10 −5 M, and a low relative standard deviation value of 5.02%. In the end, the obtained hybrid SERS substrate was used to detect nitrofurazone and an excellent LOD of 1 ppm was achieved. Overall, our novel sandwich Au/MSiO 2 /Ag hybrid SERS substrate provides a rapid and accurate way of monitoring ultra-low trace antibiotics, which can significantly promote food safety.
Graphical abstract
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Materials Today Communications
·
2021
·
IF 3.383
Thanakorn Yeamsuksawat,Hui Zhao,Jun Liang
This work aimed to synthesize Fe 3 O 4 @Chitosan@Ag nanoparticles by employing the suspension technique with a crosslinking agent, producing the Ag nanoparticles (AgNPs) using glucose as a reducing agent and applying them to the surface of Fe3O4@Chitosan. The Fe 3 O 4 @Chitosan@Ag nanoparticles were characterised by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) to determine the existence of chitosan and Ag nanoparticles on the surface of the Fe 3 O 4 . The thermal stability, morphology, and magnetic behaviour were studied by comparing the results among Fe 3 O 4 , Fe 3 O 4 @Chitosan, and Fe 3 O 4 @Chitosan@Ag with thermogravimetric analyses (TGA), transmission electron microscopy (TEM), and a vibrating sample magnetometer (VSM), respectively. Moreover, the comparison of antimicrobial activity between Fe 3 O 4 @Chitosan and Fe 3 O 4 @Chitosan@Ag nanoparticles was conducted by the colony count method. Based on the results, both types of nanoparticles can inhibit the growth of microbes. However, the Fe 3 O 4 @Chitosan@Ag showed superior results of at least 99.5 % prevention of the growth of microorganisms. These developed antimicrobial nanoparticles could be the potential antimicrobial agent or additives in various medical, biological, food packaging, and textile applications.
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CARBOHYDRATE POLYMERS
·
2020
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IF 7.182
Wenxin Zhu,Wei Huang,Wenhua Zhou,Zhe Qiu,Zheng Wang,Haojun Li,Yonggui Wang,Jian Li,Yanjun Xie
Bio-based membranes for emulsion separation are sustainable, low-cost, renewable, biodegradable, and nontoxic. Herein, an antibacterial sandwich-like composite paper was fabricated by a facile process using Ag nanoparticles (Ag NPs)-coated pulp fibers and cellulose nanofibrils (CNFs). The obtained Ag-Pulp/CNF composite paper was superhydrophilic, allowing a 96 % separation efficiency for various oil-in-water emulsions. This outstanding separation efficiency was maintained over 20 separation cycles. The composite paper also showed satisfactory separation performance for water-in-oil emulsions after modification to render the surface hydrophobic. The CNFs provided the composite a nanoscale pore, which rejected nearly 100 % of bacteria when used to filter bacteria-contaminated emulsions due to a physical barrier effect. Attributed to the intrinsic antibacterial capability of Ag NPs, the composite paper exhibited strong antibacterial performance against Escherichia coli . Thus, the composite paper that was mainly derived from sustainable pulp fibers exhibited potential performance for oil/water separation and water purification.
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ACS Applied Nano Materials
·
2020
·
IF 0
Ya Li,Xu Li,Md Mofasserul Alam,Dongbo Yu,Jibin Miao,Ming Cao,Peng Chen,Ru Xia,Bin Wu,Jiasheng Qian
With the increasing integration of electronic devices, there are growing demands for excellent thermal conductivity of thermal management materials on account of severe heat accumulation in practical applications. Graphene has been widely used in thermal conductivity nanocomposites because of its high in-plane thermal conductivity; however, inadequate through-plane thermal conductivity has become a major obstacle for extensive application. To deal with this issue, in this study, the Ag nanowire (AgNW) decorated reduced graphene oxide (rGO/AgNW) filler was prepared by in situ growth of AgNW between the interspacing of graphene nanosheets. As a result, the through-plane thermal conductivity of the nanocomposites reached 2.51 W/(m K), which was 260% more than pure graphene and 200% as high as those with Ag nanoparticle (AgNP) decorated rGO (rGO/AgNP). The enhancement that was attributed to AgNW created a “highway” of heat transfer pathways between the graphene layers and generated the synergistic effect of heat transfer with graphene. The nonequilibrium molecular dynamics simulation further revealed that the synergistic effect of boosting through-plane thermal conductivity was originated from the stronger excitation effect of low-frequency phonon (LFP) mode of AgNW. It would activate the LFP mode of the interface carbon atoms by resonance with AgNW and thus improve the phonon vibrational density of states of rGO/AgNW to realize more thermal transmit across the interface. It was expected that our rGO/AgNW hybrid structure as a thermal conductivity filler is of great promise for the high-efficiency through-plane heat transfer.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weiwei Meng,Lei Dai,Yuehua Li,Zhangxing He,Wei Meng,Huizhu Zhou,Ling Wang
Mixed potential NH 3 sensors with La 9.95 K 0.05 Si 5 AlO 26.45 (LKSAO) as the solid electrolyte and Bi 1-x Ag x VO 4- δ as the sensing electrode (SE) were developed. Bi 1-x Ag x VO 4- δ was produced by solid state reaction and then characterized by XRD, XPS, SEM and EDS. As revealed from the results, The BiVO 4 samples exhibit an unchanged crystalline structure after Ag doping molar amount x≤0.2, accompanied by the growth of the particle. The sensor based on Bi 1-x Ag x VO 4 - δ exhibit the noticeably enhanced sensing performance to NH 3 in contrast to the sensor using BiVO 4 , including its larger response potential (Δ V ) and higher sensitivity. For instance, the sensors based on BiVO 4 and Bi 0.8 Ag 0.2 VO 4 - δ at 400 °C exhibit the sensitivities of -28.1 and -77.3 mV/decade, respectively. Nevertheless, by Ag doping, there is no effective improvement of the anti-interference ability of the sensor against NO and NO 2 . To address the mentioned problem, CuO, NiO and La 0.8 Sr 0.2 MnO 3 (LSM) were used as reference electrodes (RE). As suggested from the results, using CuO and NiO as the reference electrodes can obviously reduce the cross-sensitivity of the sensor to NO and NO 2 , whereas the sensitivity slightly decrease.
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FOOD CHEMISTRY
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2020
·
IF 6.306
Long Wu,Weimin Zhang,Chen Liu,Mohamed F. Foda,Yongheng Zhu
In this work, based on the strawberry-like SiO 2 /Ag nanocomposites (SANC) immersed filter paper, a newly surface-enhanced Raman scattering (SERS) substrate was constructed for the detection of acrylamide (AAm) in food products. To construct filter paper-based SANC (F-SANC) SERS substrates, SiO 2 nanoparticles (SNP) were firstly synthesized and acted as carriers. After that, the in-situ preparation of silver nanoparticles (Ag NP) on SNP surface was carried out to form the strawberry-like three-dimensional (3D) structure of SANC. Finally, SANC were entangled into the filter paper to produce nanoarchitecture, thus providing enhanced plasmon resonance between SANC with strong SERS signal. Under the optimized conditions, the method exhibited good performance toward AAm with a vast linear response from 0.1 nM to 50 μM (R = 0.9935), limit of detection (LOD) of 0.02 nM (S/N = 3), and the recoveries of 80.5%~105.6% for practical samples. This strategy showed good robustness in the rapid and sensitive detection of AAm, which could be a promising strategy in food analysis and verification.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Su Ding,Zhi Jiang,Fei Chen,Li Fu,Yanfei Lv,Yahui Qian,Shichao Zhao
Transient conductors are one of the most important components in transient electronics, which attract great attention because of their environment-friendly and biocompatible characters. To meet the requirement for wearable electronics, good stretchability and mechanical durability are needed for the transient conductors. However, it remains challenging to achieve stretchability and transient behavior simultaneously because of a lack of the proper elastomer. Herein, we demonstrate the first highly stretchable and transient conductor from a composite material of Ag flakes and gelatin hydrogel. It shows a maximum stretchability of more than 100% with minimal resistance increase and a good cyclic durability of 1000 cycles of deformation at 20%. The above mentioned good mechanical properties come from the rational design of the conductor with a seamless interface between the hydrogel and Ag flakes. When the conductor is immersed in water at 60 °C, it can be quickly dissolved within 90 s, and the transient behavior can be controlled by tuning the content of the hydrogel in the conductors and dissolving temperature. These properties make the conductor a good wiring candidate for stretchable and transient electronics.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yi Li,Lu Yu,Jiansheng Li,Lianjun Wang,Rui Lu
The preparation of surface-enhanced Raman scattering (SERS) substrate with both structural stability and SERS activity under extreme pH conditions faces several problems, including tedious preparation, time consuming processes, high cost, and the need for professional equipment and personnel. Herein, a facile preparation protocol for a large-scale nanoarray film substrate was developed for multi-purpose SERS sensing. Through a simple self-assembly process under specific conditions, well-ordered, highly sensitive, structurally tunable, acid-alkali resistant and disposable “polyamide@Ag” coralloid nanoarrays were fabricated. Due to the dense distribution of AgNPs on the top and side surfaces of the nanoarrays and optimized geometric construction, a large number of controllable Raman “hotspots” formed in the space, resulting in excellent Raman signal uniformity and SERS performance for Rhodamine 6G. To evaluate the potential application of this flexible substrate, it was implemented in the label-free trace determination of folic acid with a limit of detection as low as 5.24 × 10 −12 M. Importantly, the as-prepared polyamide@Ag nanoarrays exhibited high structural stability over a wide pH range from 1.25 to 12.00, which is beneficial for the detection of non-pH-neutral samples. The results demonstrated that this hybrid substrate has broad application prospects in fields as diverse as biosensing and environmental monitoring.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lei Chen,Chun Li,Xiaoqing Si,Xiaoyang Wang,Zhiquan Wang,Jian Cao
Based on reactive air brazing (RAB), we designed a new type of sealant (Ag–xCuAlO 2 ) for joining 3 mol.% yttria-stabilized zirconia (YSZ) ceramics and AISI 310S stainless steel. The CuAlO 2 content affected the wettability of the sealant on the YSZ surface, and the joints had a high shear strength when Ag–2 wt.%CuAlO 2 , which had a small contact angle on the YSZ substrate, was used as the sealant. In addition, the thickness of the oxide layer was reduced compared to that for the Ag–CuO sealant. The effects of the processing parameters on the microstructure and shear strength of the joints were investigated, and the as-brazed joints reached their highest shear strength (93.7 MPa) when brazed at 1040 °C for 30 min. After high-temperature oxidation at 800 °C for 200 h, the shear strength of the joints remained at 50 MPa, and no apparent change in the microstructure was observed, proving that the joints possessed excellent oxidation resistance .
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