INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 2
·2058-2069
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IF 3.741
Junkai Gao,Xi Tang,Yan Chen,Yi Liu
Summary The thermal conductivity of shape-stabilized phase change material of polyethylene glycols/porous carbon microspheresdoping withcopper particles (PEG/CARM-Cu) was enhanced based on the adsorption and in situ reduction of Cu 2+ using polydopamine microsphere (PDAM)material as the adsorbent. The synthesis of PDAM has the merits of simplicity and environmental friendliness, and the in situ reduction of Cu 2+ through pyrolysis has the advantages of easy operation and cost effectiveness. Copper particles prepared by in situ reduction were tightly fixed on the surface of the support ofporous carbon microsphere (CARM), which avoided the sedimentation of copper particles during the phase change process of PEG/CARM-Cu. According to the SEM, TEM, XRD, TGA and DSC test results, PEG/CARM-Cu possessed favorable thermal reliability and stability, and the phase change enthalpy of PEG/CARM-Cu-2 could reach 101.50 J/g. Additionally, the thermal conductivity of PEG/CARM-Cu-2 (0.497 W/(m·K)) was enhanced by 93.3% compared to that ofpure PEG (0.257 W/(m·K)). Therefore, the PEG/CARM-Cu developed in this paper possessed great potential for real applications.
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Environmental Science-Water Research & Technology
·
2020
·Vol. 7
·期 3
·479-486
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IF 3.449
Zhiwei Yang,Xiaonan Tan,Daojian Tang,Jing Li,Jiahai Ma
In this study, the contrasting activities and pathways of Mn2+/Cu2+–HCO3− systems for Congo red (CR) dye degradation are presented. The Mn2+–HCO3− system (with the well-known MnIVO as the reactive species) did not degrade CR, while the Cu2+–HCO3− system (with high-valent Cu proposed as the reactive species) had a good oxidizing ability for CR. Further, HO radicals in the classic Fenton-like system made no contribution to CR degradation with both Cu and Fe ions as catalysts. The results indicate that reactive species in metal–HCO3− AOPs need prudent examination and better understanding of the underlying mechanism would benefit the development of more efficient AOPs.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Wentao He,Qundi Yu,Nan Wang,Xiao-kun Ouyang
Chitosan (CS)—a natural macromolecule—exhibits various limitations, such as difficult recovery, low mechanical strength, and low adsorption capacity. In this work, to address these shortcomings, polyvinyl alcohol (PVA) was mixed into chitosan beads, thereby improving the mechanical strength and acid resistance of CS. Following this, ethylenediamine tetraacetic acid (EDTA) was introduced to the surface of the mixed beads to fabricate PVA-CS-EDTA, a functionalized adsorbent. Series characterization methods are employed to study the surface morphology, chemical groups, and adsorption strengths of the adsorbents. Moreover, the effects of various adsorption conditions on Cu(II) adsorption are studied. According to the results, the adsorption of Cu(II) by the adsorbent beads follows pseudo-second-order kinetics and the Langmuir adsorption isotherm model. The maximum adsorption capacity of PVA-CS-EDTA is 127.81 mg/g, which is substantially higher than that of the CS beads. In addition, the PVA-CS-EDTA beads remain structurally intact even after treatment with an acidic solution (pH = 2). The higher adsorption capacity and acid resistance of the developed CS are promising for wide applications in the field of adsorption.
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Molecular Systems Design & Engineering
·
2021
·Vol. 6
·期 10
·825-831
·
IF 4.935
Shaoqing Li,Wei Huang,Wei Tan,Lizhu Zhang,Yanli Zhang,Hongyu Shi,Motilal Mathesh,Colin J. Barrow,Wenrong Yang,Hongbin Wang
Functionalized gold nanoparticles (GNPs) have been extensively studied for cargo delivery and imaging towards biomedical applications. However, there are limited studies showcasing the above two in sync using GNPs. In this work, we fabricated a nanosystem for small molecule delivery and bioimaging based on L-cysteine (L-Cys)-functionalized GNPs (GNP–L-Cys) coupled with a rhodamine 6G derivative (Rh6G2). GNPs conjugated with Rh6G2 (GNP–L-Cys–Rh6G2), as a model system, showcased enhanced fluorescence emission due to “on-demand” release of the rhodamine dye (RGCOOH) from the surface of the GNPs through spiro ring-opening followed by an ion-catalyzed hydrolysis mechanism in the presence of Cu2+. Moreover, in vitro studies showed sustained release of RGCOOH into cells; thus, GNP–L-Cys–Rh6G2 acted as a delivery vehicle without causing significant cell toxicity and was further used for fluorescence imaging. We believe such nanoscale systems with molecular scale engineering open up new possibilities for biomedical applications.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Qing Xu,Mengling Chang,Yu Zhang,Endian Wang,Min Xing,Long Gao,Zhiguang Huan,Feng Guo,Jiang Chang
Quick and effective sterilization of drug-resistant bacteria inevitably became an ever-growing global challenge. In this study, a multifunctional composite (PDA/Cu-CS) hydrogel mainly composed of polydopamine (PDA) and copper-doped calcium silicate ceramic (Cu-CS) was prepared. It was confirmed that PDA/copper (PDA/Cu) complexing in the composite hydrogel played a key role in enhancing the photothermal performance and antibacterial activity. Through a unique “hot ions effect”, created by the heating of Cu ions through the photothermal effect of the composite hydrogel, the hydrogel showed high-efficiency, quick, and long-term inhibition of methicillin-resistant Staphylococcus aureus and Escherichia coli. In addition, the hydrogel possessed remarkable bioactivity to stimulate angiogenesis. The in vivo results confirmed that the “hot ions effect” of the composite hydrogel removed existing infection in the wound area efficiently and significantly promoted angiogenesis and collagen deposition during infectious skin wound healing. Our results suggested that the design of multifunctional hydrogels with “hot ions effect” may be an effective therapeutic approach for the treatment of infectious wounds.
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PubMed
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
·
IF 4.192
Chong Chen,Lin-Lin Yang,A-Ling Tang,Pei-Yi Wang,Rong Dong,Zhi-Bing Wu,Zhong Li,Song Yang
Salicylic acid (SA), a crucial, plant-derived signal molecule, is capable of launching global transcriptional reprogramming to assist plants in obtaining the systemic acquired resistance (SAR) mechanism. Thus, the accurate detection of SA will not only significantly contribute to the understanding of the plant SAR but also contribute to crop protection and to the security of the agricultural production and food supply. However, detection of SA using fluorescent probes is a great challenge for scientists, because SA analogues can significantly interfere with the detection results. Herein, we first reported using a simple, natural curcumin–Cu2+ ensemble to selectively and sensitively monitor SA in situ and in vivo, directed by a fluorescence “turn-on” mode. A binary combination curcumin–Cu2+ was first fabricated with a fluorescence “turn-off” pattern caused by the paramagnetic nature of Cu2+. Subsequently, a fluorescence “turn-on” response was performed for detecting SA accompanied by the formation of the ternary complex curcumin–Cu2+–SA due to the high affinity of SA toward Cu2+, which reduced the fluorescent impact caused by the paramagnetism of Cu2+. Further study revealed that the rationally designed hybrid probe could monitor SA in living cell lines. We anticipate that this finding can inspire the discovery of a high-performance SA probe.
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PubMed
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 8
·2343-2352
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IF 5.721
Ziheng Zhen,Wenxiang Tang,Wei (Willy) Chu,Tao Zhang,Li Lv,Shengwei Tang
The dispersity and the neighboring degree of different sites play crucial roles in the catalytic performance of dual site catalysts. The solution of precursors was encapsulated into microdroplets by forming a microemulsion. The average diameter of microdroplets was about 45 nm. This guaranteed that the dosage of precursors was at the attogram level and only about a thousand precursor molecules were encapsulated in each microdroplet. An anti-solvent extraction method was applied to extract water from the microdroplets with acetonitrile. The precursors co-precipitated in the microdroplets due to the loss of water. The encapsulated precursors in the microdroplets co-precipitated together in nanoscale space, so the neighboring degree of the two precursors was improved significantly. The prepared catalyst was characterized by ICP-OES, BET, XRD, H2-TPR, TEM and XPS. Compared with the Cu–ZnO/Al2O3 (CZA) catalysts prepared by the conventional impregnation method, the CZA catalysts prepared by the proposed strategy had much stronger interaction and a better neighboring degree of the dual active sites. They also showed very good catalytic performance for the reverse water gas shift (RWGS) reaction. The CO2 conversion of the designed CZA catalysts was about 1–2 times higher than that of the CZA catalysts prepared by the conventional impregnation method at 0.1 MPa, 300–400 °C and a CO2/H2 mole ratio of 1.
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ACS Omega
·
2020
·
IF 2.87
Nuo Xu,Yuan-Fan Yang,Long Chen,Jian Lin
The application of disulfiram can be traced back to the 1920s, from when it was utilized to facilitate alcohol abstinence by producing allergic reactions toward alcohol. In previous research, combination of disulfiram and copper ions has demonstrated significant anti-tumor activity. However, both disulfiram and copper ions lack the ability of specific targeting to tumor tissues and may lead to a high risk of side effects, especially for copper ion, which is a kind of toxic heavy metal. Herein, a ferritin–albumin–Cu nanoparticle (FHC NP) was introduced. The nanoparticle was synthesized by first covalently cross-linking ferritin and albumin and then encapsulating the copper ions in the ferritin nanocage. The nanoparticle showed good accumulation in a tumor and when combined with disulfiram exhibited good in vitro selectivity toward cancer cells and better in vivo anti-tumor activity. Herein, the nanoparticle invented here represented a good strategy to efficaciously deliver copper ions into tumors and thus improve the therapeutic efficacy of disulfiram in tumor therapy.
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PubMed
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Green Energy & Environment
·
2020
·
IF 6.395
Yuewen Shao,Tingting Wang,Kai Sun,Zhanming Zhang,Lijun Zhang,Qingyin Li,Shu Zhang,Guangzhi Hu,Xun Hu
Oxides with different crystal phases can have important effects on the configuration of surface atoms, which can further affect the distribution of hydrogenation sites and acidic sites as well as the competitions of these varied types of catalytic sites. This could be potentially used to tailor the distribution of the products. In this study, zirconium oxides with different crystal phases supported copper catalysts were prepared for the hydrogenation of the biomass-derived furfural, vanillin, etc. The results showed that both calcination temperature and Cu species affected the shift of zirconia from tetragonal phase to the monoclinic phase. Monoclinic zirconia supported copper catalyst can effectively catalyze the hydrogenation of furfural to furfuryl alcohol via hydrogenation route due to its low amount of Brønsted acidic sites, although the surface area and the exposed metallic Cu surface area were much lower than the tetragonal zirconia supported copper catalyst. Zirconia with tetragonal or tetragonal/monoclinic phases supported copper catalysts contain abundant acidic sites and especially the Brønsted acidic sites, which catalyzed mainly the conversion of furfural via the acid-catalyzed routes such as the acetalization, rather than the hydrogenation. The acidic sites over the Cu/ZrO 2 catalyst played more predominant roles than the hydrogenation sites in determining the conversion of the organics like furfural and vanillin.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Zhen Yang,Liqin Cao,Yongmao Qian
Herein, Cu-BDC/poly( N -methylol acrylamide- co -sodium allyl sulfonate) [Cu-BDC/P(NMA- co -SAS)] macroporous foam was synthesized templating from CO 2 -in-water (C/W) high internal phase emulsions (HIPEs), and using Cu-BDC as Pickering emulsifier . The features of the macroporous monolith, such as structure and void diameter, can be adjusted by changing the emulsion composition . The resultant macroporous foams have a low bulk density (0.317 g cm −3 ), high porosity (79.60 %), suitable pore volume (3.956 cm 3 g -1 ), and pore size ranging from 5.46 μm to 36.47 μm. The maximum swelling degree of 20.7 g/g for the composite foam was obtained when a high MBAM dosage of 12.5 wt% was used. Moreover, adsorption behavior and antibacterial property of the composite foam with 5.0 wt% Cu-BDC were investigated. The results proved that the obtained foam could behave as a potential multi-functional antibacterial material.
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OPTICAL MATERIALS
·
2020
·
IF 2.779
Ting Chen,Yanqiao Xu,Zhixiang Xie,Lianjun Wang,Weihui Jiang,Wan Jiang
I–III–VI quantum dots (QDs), as a new class of light-emitting materials, have aroused a great of attention for an impressive variety of applications. A facile one-pot approach was employed to synthesize highly luminescent Cu–In–Zn–S/ZnS (CIZS/ZnS) core/shell QDs. It was found that the CIZS/ZnS QDs prepared using sodium sulfide as sulfur source exhibited the strongest emission due to its highest chemical reactivity as compared to thiourea and thioacetamide. The combination of GSH content and pH value played a crucial role in the growth of ZnS shell, which was responsible for the bright emission of QDs. The surface defects of QDs could be effective passivated by GSH, which exhibited a significant improvement of emission intensity. The optimum pH value of 7 was also established due to the fact that the deprotonized sulfhydryl group of GSH molecule strongly coordinated with Zn 2+ at neutral pH value. Moreover, the particle size and composition of the CIZS/ZnS QDs can be well adjusted by tuning the n Zn / n CuInZn ratios. The maximum quantum yield (QY) of CIZS/ZnS QDs increased from 5.95% to 26.12%, accompanying by the improvement of the radiative decay rate from 1.90 × 10 5 to 5.64 × 10 5 s −1 . Furthermore, a blue LED-pumped white light-emitting diode (WLED) device was realized by combining yellow-orange CIZS/ZnS QDs with green Lu 3 Al 5 O 12 :Ce 3+ phosphor, achieving a luminous efficacy (LE) of 66.9 lm/W, and color rendering index (CRI) of 87.2, which demonstrated their great application potential in solid-state lighting field.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Liping Cao,Ze-Wen Kang,Qi Ding,Xiaohui Zhang,Hetong Lin,Mengshi Lin,Da-Peng Yang
Bioremediation is one of efficient methods to solve the issues of water or soil contaminated by metal ions . However, the harvested biowaste is often troublesome to handle owing to the second pollution. Herein, the waste eggshell membrane was used to adsorb Cu 2+ in wastewater, which was then converted into biochar containing copper ions (Cu 2+ -Cu + /Biochar) via a rapid pyrolysis . By integrating the collective advantages of eggshell membrane and Cu 2+ -Cu + , such as superior electrical conductivity, enlarged electrochemically active surface area, unique three-dimensional porous network characteristics, and fast charge transport, the Cu 2+ -Cu + /Biochar system can be used as a self-supporting sensor for detection of nitrite (NO 2 − ). The sensor demonstrated superior electrochemical sensing abilities accompanied by a broad linear range (1–300 μM), ultralow detection limit (0.63 μM), and high sensitivity (30.0 μA·mM −1 ·cm −2 ). In addition, the fabricated electrochemical sensor has excellent stability, good reproducibility, and strong anti-interference performance. More importantly, the sensor has a high recovery rate when it is used to detect nitrite in tap water , mineral water , and sausage, indicating the feasibility of using this sensor in practical applications. This study provides a green and sustainable approach for simultaneous treatment of biomass waste eggshell membrane, remedy of heavy metals, and electrochemical detection of nitrite.
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PubMed
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