MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
·
IF 4.644
Yuewen Li,Yu Zhang,Xing Hou,Chunkun Lin,Degang Bu,Yalin Lan,Na Li,Shuyao Wu,Shuo Li,Xi-Ming Song
Seeking novel solar energy utilization and conversion methods has always been a frontier topic in energy research. Here, we propose a new way to directly photoelectrodeposit metals using solar energy based on semiconductor energy band theory . Three kinds of semiconductor photoanodes (TiO 2 , BiVO 4 and Fe 2 O 3 ) are employed to deposit metallic Cu or Bi at the cathode under illumination without external voltage. It is found that when TiO 2 and BiVO 4 are used as photoanodes, Cu, Cu 2 O and Bi can be continuously deposited on the cathode, but when Fe 2 O 3 photoanode is irradiated, no material comes out. The results prove that the potential of electrons in the conduction band determines whether photoelectric deposition occurs or not. The related mechanism involves the oxygen reduction reaction (OER) of the valence band holes of the photoanode, the collection of conduction band electrons by back electrode, as well as the reduction of metal ions on the counter electrode. In addition, we also put forward the concept of using the deposited Cu or Bi as the metal electrode to form a new metal-air battery to release chemical energy of the deposited metal.
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RSC Advances
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2022
·Vol. 12
·期 48
·31186-31191
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IF 4.036
Dandan Jiang,Minghao Zheng,Xiaoyang Yan,Bin Huang,Hui Huang,Tianhao Gong,Kunming Liu,Jinbiao Liu
Herein, we report a highly selective fluorescent probe for the detection of Cu(II). The detection mechanism relies on the Cu(II)-catalyzed oxidative hydroxylation of 2-(aminocarbonyl)phenylboronic acid into salicylamide, thus recovering the excited-state intramolecular proton transfer (ESIPT) effect and inducing more than 35-fold fluorescence enhancement. The simple structure and readily available fluorescent probe give a novel method for quantitatively detecting Cu(II) in the linear range of 0–22 μM, with a limit of detection down to 68 nM, and exhibiting high selectivity for Cu(II) over 16 other metal ions.
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高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
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2022
·Vol. 195
·期 2
·1216-1230
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IF 3.094
Cheng Qiaojuan,Chi Xinyu,Liang Yingchao,Li Wanxin,Sun Jiaxin,Tao Jin,Wang Zhi
Metal–organic frameworks (MOFs) can be used as the immobilization carriers to protect the physicochemical properties of enzymes and improve their catalytic performance. Herein, we report an in situ co-precipitation method to immobilize lipase from Candida sp. 99–125 in Cu-BTC MOF (BTC = 1, 3, 5-benzene tricarboxylic acid, H 3 BTC). Characterizations of the immobilized lipase (lipase@Cu-BTC) have confirmed the entrapment of lipase molecules in Cu-BTC MOF. The immobilized lipase has been successfully applied for resolving N- hydroxymethyl vince lactam ( N -HMVL) and its catalytic activity is five times that of native enzyme. More importantly, we found that Cu-BTC MOF can afford powerful protection for enzyme in nearly dry organic solvent and endow the immobilized lipase with excellent reusability and storage stability. Our present study may widen the application of immobilized enzyme with MOF as the immobilized carrier. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·78874-78886
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IF 5.19
Xu Junge,Hu Die,Wang Yingmu,Zhang Ziwei
Ciprofloxacin (CIP) is a third-generation fluoroquinolones (FQs) antibiotic, and the occurrence of CIP in the water environment has raised growing concerns owning to its environmental toxicity. In this paper, a novel α-(Fe, Cu)OOH/RGO nanocomposite was synthesized via a one-step reflux method for CIP degradation through a photo-Fenton-like process. When the RGO content was 1 wt%, CIP degradation ratio by the α-(Fe, Cu)OOH/RGO nanocomposite reached 100% under visible light irradiation within 120 min, and total organic carbon (TOC) removal ratio reached 60% within 180 min. The result of molecular fluorescence spectra highlighted that the loading of RGO on the α-(Fe, Cu)OOH significantly increased the content of hydroxyl radicals (·OH) in the heterogeneous photo-Fenton-like system and simultaneously inhibited the recombination of photogenerated electron and hole, which played critical roles in the enhancement of CIP degradation. In addition, 11 main intermediates were identified as the degradation products of CIP in the α-(Fe, Cu)OOH/RGO/H 2 O 2 /visible light reaction systems using liquid chromatograph–mass spectrometer (LC-MS) analyses. The results demonstrated that three degradation pathways for CIP removal by α-(Fe, Cu)OOH/RGO nanocomposite occurred, including (i) oxidation on the piperazine ring and dealkylation, (ii) defluorination and decarboxylation, and (iii) hydroxylation on the quinolone ring. This work would provide a novel insight of CIP degradation pathways in photo-Fenton-like processes. Graphical abstract
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高影响因子
Materials Today Communications
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2022
·
IF 3.662
Yaxi Tian,Dongyun Que,Rongfeng Guan,WenYan Shi
Cu-BiVO 4 photocatalysts with an excellent visible light response were successfully fabricated by modification with a SiO 2 template and Cu doping. The SiO 2 hard template changes the morphology of BiVO 4 from rod to sphere. The structure, chemical composition, and optical and photoelectrochemical properties of the photocatalysts were characterized. The photocatalytic activity was measured through RhB degradation under visible light irradiation. The results indicate that copper is successfully doped in the form of Cu 2+ and Cu + . Copper can be used as electron capture traps, which reduces the carrier recombination rate. Compared with other reports, Cu doping is found to greatly improve the ability of BiVO 4 to degrade RhB. The crystal phase of BiVO 4 is not significantly changed due to Cu doping, and the optimal doping amount is 10%. The RhB degradation rate of the optimal 10% Cu-BiVO 4 sample reaches 99.7% within 70 min. Cu-BiVO 4 exhibits stable degradation activity, and the photocatalytic kinetics follows a pseudo-first-order equation. ·O 2 - and h + play dominant roles in RhB degradation by Cu-BiVO 4 . The mechanism for the enhancement of the BiVO 4 photocatalytic ability was researched with first-principles calculations. The results of band structure and density of states calculations reveal that Cu doping not only promotes electron transitions but also acts as an electron trap to reduce the recombination rate and enhance the efficiency of separation and transfer of photogenerated charge carriers. This work highlights a new way to improve the photocatalytic performance and applications of BiVO 4 .
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AICHE JOURNAL
·
2022
·Vol. 68
·期 11
·e17834
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IF 4.167
Wuyuan Liu,Zhaoying Wang,Ming Sun,Jiajian Gao,Lifeng Wang,Zihan Gao,Yingying Xu,Xiangyun Zhao,Cheng Zhang,Lin Yu
A series of CeO 2 modified Cu-SSZ-13 monolith catalysts were prepared by embedding CeO 2 into the washcoat of Cu-SSZ-13 monolith catalyst through solvent combustion method. These CexCu-SSZ-13 catalysts were studied in the selective catalytic reduction (SCR) of NO with NH 3 , among which the Ce2Cu-SSZ-13 catalyst exhibited the best low-temperature activity, hydrothermal stability, and sulfur resistance. The physicochemical properties of the catalysts were characterized using multiple methods. Results showed that the acidity, redox capacity, and ammonia adsorption capacity significantly enhanced after CeO 2 modification, thus leading to the high performance of Ce2Cu-SSZ-13 catalyst. Furthermore, the introduction of CeO 2 induced the fast SCR reaction by promoting the oxidation of NO to NO 2 . Analog calculation suggested that the porous structure generated via solvent combustion in the washcoat effectively increased the diffusion rate of reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy ( in situ DRIFT) analysis showed that Brønsted acid sites were the main active center and the reaction followed Eley–Rideal mechanism.
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NANO
·
2022
·
IF 1.438
Bo Tang,Ke Liu,Jiayuan Liu,Zhengwei Wang
Volatile organic compounds (VOCs) are the one kind of pollution, which lead to the severe atmospheric contamination problem. Metal organic frameworks (MOFs) and graphene are promising candidates to collect VOCs. In this study, composites which consist of graphene sheets and Cu-BTC (benzene-1,3,5 tricarboxylic acid) are prepared by the hydrothermal method to adsorb VOCs and CO. Moreover, the morphology of the resulting graphene material in the composites can be controlled by adjusting the pH value, reaction time and surfactant during the hydrothermal process, which further determines the adsorption ability for different gas molecules. According to the pore distribution features of various composites, the morphology of graphene exerts a fatal influence on the observed adsorption performances. Furthermore, the polarity of the as-prepared composites is another important determinant to selective adsorption for various VOCs. The stability of these composites under high temperature is also tested, and the results demonstrate that the adsorbents can be used in a wide temperature range. Moreover, the large BET areas and high stability of the composites in the water endow them a potential application in the sewage clarification field. After the corresponding optimization, the adsorption amounts of methanol and ethanol reach 13.6 mmol g − 1 and 9.68 mmol g − 1 , respectively.
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Nanomaterials
·
2022
·Vol. 12
·期 7
·1063
·
IF 5.719
Guannan Yang,Shaogen Luo,Tao Lai,Haiqi Lai,Bo Luo,Zebo Li,Yu Zhang,Chengqiang Cui
In this work, we developed an eco-friendly and facile microvia filling method by using printing and sintering of Cu-Ag core-shell nano-microparticles (Cu@Ag NMPs). Through a chemical reduction reaction in a modified silver ammonia solution with L-His complexing agent, Cu@Ag NMPs with compact and uniform Ag shells, excellent sphericity and oxidation resistance were synthesized. The as-synthesized Cu@Ag NMPs show superior microvia filling properties to Cu nanoparticles (NPs), Ag NPs, and Cu NMPs. By developing a dense refill method, the porosity of the sintered particles within the microvias was significantly reduced from ~30% to ~10%, and the electrical conductivity is increased about twenty-fold. Combing the Cu@Ag NMPs and the dense refill method, the microvias could obtain resistivities as low as 7.0 and 6.3 μΩ·cm under the sintering temperatures of 220 °C and 260 °C, respectively. The material and method in this study possess great potentials in advanced electronic applications.Keywords:Cu-Ag core-shell nano-microparticles;microvias;vertical interconnection;blind hole filling;sintering
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Fei Qu,Yue Wang,Dafeng Jiang,Xian-en Zhao
The Metallacrowns (MCs) composed of repeated [Metal-N-O] subunits are a type of new material, but the MCs have not been developed and utilized in analytical applications. This essay reports on a new kind of terbium(III)-based Metallacrowns (Tb-MCs) with aggregation-induced emission (AIE) feature to build a sensing platform. It is first time that Tb-MCs are able to aggregate to larger aggregates in water along with a bright green emission, so that the property makes it possible to apply in biosensing. Thereafter, the AIE of Tb-MCs can be quenched effectively by Cu 2+ . Based on the high affinity of thiol to Cu 2+ , cysteine (Cys) recovers the fluorescence of Tb-MCs in the presence of Cu 2+ . There is a good linear range varying from 0.02 to 20 μM with a low limit of detection (LOD) 9.67 nM of Cys. In the end, this novel probe is also successfully applied to the determination of Cys in human serum with satisfactory results.
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SOLAR ENERGY
·
2022
·
IF 7.188
Shuang'an Liu,Senyang Wang,Ying Cao,Chengyang Liang,Shitong Geng,Haipeng Guo,Ying Liu,Wenming Zhang,Ling Li
The catalytic enhancement of counter electrode materials is of an essential move for the overall evolution of QDSSCs. While the commonly used Cu 2 S/Cu counter electrode is easy to be eroded off by sulfur electrolyte, resulting in photoanode pollution. Herein, rough polyhedron Cu/Co@NCF composite is smoothly prepared via hydrothermal and synchronous doping method to replace Cu 2 S/Cu application. With the ZIF-67 as carbon source and morphology support, Cu and Co nanoparticles (NPs) are uniformly embedded in the carbon polyhedron without agglomeration, while the doping of nitrogen makes the composites have better porous structure. Combining the superior catalytic from Cu and Co particles with the electrical conductivity and stability from the carbon frame, the Cu/Co@NCF composite as QDSSCs counter electrode achieves an excellent photoelectric conversion effect (6.66%), close to that of Cu 2 S/Cu (7.29%). With stable and excellent counter electrode performance, Cu/Co@NCF composite unquestionably has the potential to be an alternative material for the CE application of QDSSCs.
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BIOMATERIALS
·
2022
·
IF 15.304
Jie Chen,Xiaomin Tan,Yanjuan Huang,Congjun Xu,Zishan Zeng,Ting Shan,Zilin Guan,Xiaoyu Xu,Zeqian Huang,Chunshun Zhao
Disulfiram (DSF), an effective FDA-approved anti-alcoholism drug, shows potent antitumor activity by producing Cu(DTC) 2 , a chelate of its metabolite diethyldithiocarbamate (DTC) and copper. However, the rapid metabolism and unselective distribution of DSF and the insufficient endogenous copper severely restrict enough bioactive Cu(DTC) 2 generation in tumor tissues to achieve satisfactory antitumor effect. Moreover, directly Cu(DTC) 2 administration also suffers from serious systemic toxicity. Herein, a reactive oxygen species (ROS)-activatable self-amplifying prodrug nanoagent (HA-DQ@MOF) was developed for the stable co-delivery of DTC prodrug and Cu-quenched photosensitizer , aiming to achieve tumor-specific dual-activation of highly-toxic Cu(DTC) 2 -mediated chemotherapy and cascaded photodynamic therapy (PDT). The ROS-cleavable hyaluronic acid-conjugated DTC prodrug (HA-DQ) was decorated on Cu 2+ and photosensitizer Zn-TCPP coordinated MOF (PDT-shielded state) to construct HA-DQ@MOF. HA-DQ@MOF could specifically activated in ROS-overexpressed tumor cells to rapidly release DTC, while remaining relatively stable in normal cells. The free DTC immediately grabbed Cu 2+ from MOF to in situ generate highly-cytotoxic Cu(DTC) 2 chelate, accompanied by MOF dissociation to restore the PDT effect of Zn-TCPP. Importantly, ROS produced by PDT could in turn trigger more DTC release, which further promoted Zn-TCPP liberation, forming a self-amplifying prodrug/photosensitizer activation positive feedback loop . Experimental results confirmed the dual-activated and combined tumor-killing effect of Cu(DTC) 2 -mediated chemotherapy and Zn-TCPP-based PDT with little systemic toxicity. This work provides a dual-activated “low toxic-to-toxic” transformable treatment pattern for tumor-specific chemo-photodynamic therapy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chuankun Yin,Aimal Khan,Qiaohui Gao,Quan Li,Xiaoyun Zhou,Xiuying Liu,Aihua Xu,Xiaoxia Li
Recently, the development of efficient mixed metal oxide catalysts for organic pollutants degradation via peroxymonosulfate (PMS) activation is a hot topic in the area of wastewater treatment . In this work, the silver-copper mixed-oxide, Ag 2 Cu 2 O 3 (ACO) was reported for the first time as a highly active catalyst for removing organic pollutants in the presence of PMS. ACO was successfully synthesized from Ag + and Cu 2+ ions at 60 °C, and its structure was strongly influenced by the temperature. The catalyst could almost completely remove p -nitrophenol and other pollutants with 0.65 mM PMS after 20 min, and also exhibited satisfactory stability and recyclability. The system efficiency was shown to vary with the concentration of PMS and catalyst, as well as solution pH. Scavenger experiment and EPR analysis indicated that radicals produced by the oxidation of Ag(I) and Cu(I) with PMS could promote degradation reaction. The synergistic effect between Cu and Ag in the bimetallic catalyst was demonstrated to contribute to the high performance: Cu(II)-O-Ag(I) bonds promote the conversion of Cu(II) species to Cu(I) through reaction with PMS, and facilitate the oxidation of Cu(I) and Ag(I) by PMS to generate active radicals. The study provides a feasible strategy to design efficient and stable bimetal oxide catalysts for PMS activation.
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