Science China-Materials
·
2023
·Vol. 66
·期 8
·3292-3299
·
IF 8.1
Zhang Tian,Yan Wen,Wang Yan,Wang Jie,Liu Congyan,Ye Fei,Liu Bo
Currently, freshwater scarcity is a global challenge, and developing low-cost methods for purifying, desalinating, and distilling seawater is crucial. Natural wood, owing to its advantages of high hydrophilicity, low density, microporous channels, and low thermal conductivity, is widely considered a vehicle for solar evaporation. However, the majority of the reported wood-based solar evaporation generators have been economically inefficient, with limited evaporation rates under low-power solar irradiation. Herein, we developed an ecofriendly and efficient wood-based solar evaporation generator comprising a material with excellent photothermal conversion efficiency, polyoxovanadate, loaded on the wood surface with a natural channel structure. The solar evaporation generator exhibited high light absorption capacity (∼98%) in the wide wavelength range of 200–1200 nm, rapid water transport through the wood channels, minimal heat dissipation due to the adiabaticity of the wood, and reduced evaporation enthalpy. Therefore, the overall evaporation efficiency was increased, and a high evaporation rate of 2.23 kg m −2 h −1 and solar-vapor efficiency of 90% under 1 Sun was observed. This environment-friendly, low-cost, and high-efficiency evaporation generator has enormous potential for practical applications in solar desalination and water purification.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 21
·5047
·
IF 3.057
Jun Cao,Peng Wang,Jie Shen,Qi Sun
Here, using Fe3O4@SiO2as a precursor, a novel core-shell structure magnetic Cu2+adsorbent (Fe3O4@zeolite NaA) was successfully prepared. Several methods, namely X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Transmission electron microscope (TEM), Brunauer Emmett Teller (BET) and vibrating sample magnetometry (VSM) were used to characterize the adsorbent. A batch experiment was conducted to study the Cu2+adsorption capacity of Fe3O4@zeolite NaA at different pH values, contact time, initial Cu2+concentration and adsorbent does. It is found that the saturated adsorption capacity of Fe3O4@zeolite NaA on Cu2+is 86.54 mg/g. The adsorption isotherm analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+is more consistent with the Langmuir model, suggesting that it is a monolayer adsorption. Adsorption kinetics study found that the adsorption process of Fe3O4@zeolite NaA to Cu2+follows the pseudo-second kinetics model, which means that the combination of Fe3O4@zeolite NaA and Cu2+is the chemical chelating reaction. Thermodynamic analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+is endothermic, with increasing entropy and spontaneous in nature. The above results show that Fe3O4@zeolite NaA is a promising Cu2+adsorbent.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Yaoguo Shen,Yi Yang,Sangen Zhao,Bingqing Zhao,Zheshuai Lin,Chengmin Ji,Lina Li,Ping Fu,Maochun Hong,Junhua Luo
Developing superior deep-ultraviolet (deep-UV) nonlinear optical (NLO) materials is a great challenge because of the contradiction between deep-UV transparency and enhanced second harmonic generation (SHG), especially for deep-UV NLO phosphates in which the constituent P–O groups have relatively small microscopic SHG coefficients. Here we report a new noncentrosymmetric phosphate Cs2LiPO4 (I), whose crystal structure consists of [LiPO4]∞ layered structural units with a novel honeycomb-like topology. As compared with the benchmark deep-UV NLO material KBe2BO3F2, I is beryllium-free, and it is relatively easy to grow its large single crystals because of its congruent melting. Furthermore, it not only is deep-UV transparent but also exhibits an unexpectedly enhanced SHG response of 1.8 × KH2PO4 that hits a new high in deep-UV NLO phosphates. These results demonstrate that I satisfies the key requirements of being a promising deep-UV NLO candidate. Theory calculations and structural analysis reveal that the enhanced SHG response can be attributed to the honeycomb-like topological structure, which endows the constituent [PO4]3– monomers of I with an aligned arrangement and as a result a favorable superposition of their microscopic SHG coefficients. These findings may provide useful insights into the development of both deep-UV NLO materials and honeycomb-like topological structures.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2020
·
IF 4.152
Hongping Li,Jinlin He,Mingzu Zhang,Jian Liu,Peihong Ni
In this study, we report a diblock copolymer based on a polyphosphate backbone and pendant phenylboronic acid with glucose sensitivity. The copolymer, abbreviated as (PBYP-g-MPBA)-b-PEEP, was prepared via a combination of ring-opening copolymerization, “click” chemistry, and amide reaction, in which the PBYP and PEEP blocks, respectively, represent two kinds of polyphosphoester structures and MPBA represents 3-mercaptopropionic acid modified with 3-aminophenylboronic acid. The amphiphilic copolymer (PBYP-g-MPBA)-b-PEEP could self-assemble into core–shell nanoparticles (NPs) in aqueous solutions. The average particle size and morphology of the NPs were measured by dynamic light scattering and transmission electron microscopy, respectively. The phenomenon that the NPs swelled at different glucose concentrations is due to the formation of boronate esters between the diol groups of glucose and boronic acid groups of phenylboronic acid. Fluorescein isothiocyanate (FITC)–insulin was loaded into the NPs and triggered to release in the presence of glucose. The more the glucose in the release media, the more the FITC–insulin released and the faster the release rate. Methyl thiazolyl tetrazolium assays and hemolysis tests proved that the (PBYP-g-MPBA)-b-PEEP copolymers had good biocompatibility. All of these results verify that the glucose-sensitive polyphosphoester diblock copolymer is highly promising for an insulin delivery system.
研究领域:
材料科学
·
药物递送
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yangsen Xu,Xi Xu,Ning Cao,Xianfen Wang,Xuehua Liu,Marco Fronzi,Lei Bi
The electrochemical conversion of N 2 to NH 3 is an interesting research topic as it provided an alternative and energy-saving method compared with the traditional way of NH 3 production. Although different materials have been proposed for N 2 reduction, the use of defects in oxides was only reported recently and the relevant working mechanism was not fully revealed. In this study, Sr was used as the dopant for LaFeO 3 to create oxygen vacancies , forming the Sr-doped LFO (La 0.5 Sr 0.5 FeO 3-δ ) perovskite oxide. The La 0.5 Sr 0.5 FeO 3-δ ceramic oxide used as a catalyst achieves an NH 3 yield of 11.51 μgh −1 mg −1 and the desirable faradic efficiency (F.E.) of 0.54% at −0.6 V vs reversible hydrogen electrode (RHE), which surpassed that of LaFeO 3 nanoparticles . The 15 N isotope labeling method was employed to prove the La 0.5 Sr 0.5 FeO 3-δ catalyst had the function of converting N 2 into NH 3 under the electrolysis condition. The first principle calculations were used to investigate the mechanism at the atomistic level, revealing that the free energy barriers changed significantly with the introduction of oxygen vacancies that accelerated the overall nitrogen reduction reaction (NRR) procedure.
研究领域:
材料科学
·
电催化
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2018
·
IF 1.666
Shufeng Liu,Ming Wang,Tingting Li,Qian Chen
The cytotoxicity of titanium dioxide nanoparticles (TiO2 NPs) to microorganisms has attracted great attention over the past few decades. As an important participator in the nitrogen cycle, aerobic denitrifiers have been proven to be negatively affected by TiO2 NPs, but the mechanism of this effect remains unclear. In this study, the bacteria-nanoparticle interaction was investigated by exposing an aerobic denitrifier, Pseudomonas stutzeri PCN-1 to different concentrations of TiO2 NPs at the dark condition, in order to investigate the cytotoxicity mechanism. The results illustrated that aerobic denitrification was inhibited at different TiO2 NPs concentrations from 1 to 128 mg/L, accompanied by the postponement of nitrate reduction and the accumulations of nitrite and nitrous oxide. But this inhibitory effect was mitigated with increasing TiO2 NPs concentrations. Further studies revealed that expressions of aerobic denitrification genes were also inhibited with the presence of TiO2 NPs, and the inhibition effect on napA and nirS genes was more significant than that on nosZ and cnorB, which might directly bring about the delayed nitrate reduction and hindered nitrite transfer. Moreover, the decreased toxicities at higher TiO2 NPs concentrations could be attributed to the formation of larger aggregates (>1000 nm), which greatly reduced the chance for direct interactions between NPs and bacterial membranes, as well as the interruption of denitrifying genes expressions. These findings were meaningful for the formation of deep insights into the mechanism of TiO2 NPs cytotoxicity as well as the development of strategies to control the negative effect of nanoparticles in the environment.Aerobic denitrification characteristics of strain PCN-1 under different carbon sources.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 47
·20751-20758
·
IF 3.288
Ying Gao,Xiu Wang,Xiang Li,Hongqi Dai
In this study, cellulose acetate (CA)/titanium dioxide (TiO2) composite films with different loadings (4 wt%–12 wt%) were prepared by the combination of ultrasonic dispersion, stirring and hot-pressing processes. Some properties of the films were characterized by techniques including SEM, XRD, FTIR spectroscopy, WCA analysis, tensile strength measurement, TGA, DSC and antibacterial analysis. The morphology and Ti element analysis mapping of the composite films were investigated through the methods of SEM. The results showed that the TiO2 nanoparticles were successfully and uniformly connected with cellulose acetate. With the increase of TiO2 content, the hydrophilic property of the films was enhanced. Films with different contents also maintained thermal stability and mechanical properties. The CA/TiO2 film with 12 wt% loading exhibited good antibacterial activity against Escherichia coli with 55.6% sterilization in 12 h. Therefore, the CA/TiO2 composite films can be applied as antibacterial films prepared by a simple method.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Xiaoyu Zhao,Minghui Feng,Yaoxin Jiao,Yingbing Zhang,Yanfei Wang,Zuoliang Sha
With the increasing global demand for lithium, lithium extraction from seawater/brine attracted extensive attentions. Selective lithiation desalination battery is a novel and promising model for this process since its good performances on selectivity , extraction capacity and energy consumption. However, multi-metal composition and possible corrosiveness of seawater/brine requires high capacity electrode with high selectivity and cycle stability. To address this issue, this work proposed a less layer graphene gauze modified Ni-rich cathode material LiNi 0.6 Co 0.2 Mn 0.2 O 2 core-shell structure microsphere (rGO/NCM) with shell thickness of 3 nm. The graphene gauze offers high electron transfer pathways instead of ion transfer between lattices, which reduced the NCM lattice collapse probability effectively. This was verified by ex-situ XRD and electrochemical results of high capacity, good cycle stability and rate performance in both organic and aqueous systems. In the desalination battery composed of rGO/NCM as positive and activated carbon (AC) as negative, rGO/NCM//AC delivered high Li + extraction efficiencies reaching 13.84 mg/g per 1 cycle in simulated brine by consuming only 1.4 Wh/mol Li + . The overall process produced 93% Li + in simulated brine at optimized operating conditions. The results indicated that rGO/NCM//AC desalination battery is a promising electrochemical lithium extraction approach.
研究领域:
材料科学
·
电化学工程
✓ 已验证
DOI
高影响因子
AIP Advances
·
2020
·Vol. 10
·期 11
·
IF 1.337
Shi Dekun,Jia Guozhi,Yao Jianghong
Precious metal nanoparticle composite two-dimensional materials have attracted widespread attention due to their excellent photothermal properties. A new method for selective modification of silver nanoparticles on atomic layered molybdenum disulfide (MoS 2 ) is presented. An Ag/MoS 2 composite structure is formed under the continuous irradiation of an 808 nm laser. The heat generated by the photothermal conversion of the MoS 2 nanosheets plays a major role in the growth of silver nanoparticles. The Ag/MoS 2 composite structure is analyzed via the combination of the absorption spectrum, scanning electron microscopy, particle size distribution, and Raman spectroscopy. The photothermal conversion can drive nanometer composite heterogeneous material growth.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 18
·5090-5099
·
IF 5.726
Yi Yu,Shuilian Liu,Jian Ji,Haibao Huang
Ozone pollution has aroused worldwide concern for its adverse impact on both the environment and human health. A series of MnO2 catalysts with different crystallinities were prepared for ozone decomposition. The crystallinity of MnO2 was regulated by varying the calcination temperature of an amorphous MnO2. The calcination temperature was confirmed oddly to have a significant effect on the morphology, the textural properties and the surface chemistry of manganese oxides. Both the pristine amorphous MnO2 and the one calcined at 300 °C (MnO2-300) exhibited superior catalytic activity for ozone decomposition owing to the abundant surface oxygen vacancies, large specific surface area, and high oxygen mobility, which were derived from the amorphous structure. FTIR and in situ DRIFTS experiments revealed that calcination generated the hydrophobic MnO2-300, which showed enhanced water resistant ability compared with the pristine amorphous MnO2, and significantly suspended catalyst deactivation. Moreover, the oxidation state of Mn slightly changed in the used MnO2-300, further maintaining the high activity. This work may broaden the horizons of designing catalysts with high stability and efficiency for ozone decomposition.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Jia Liu,Run-Tian Ma,Yan-Ping Shi
With the increasing demand for lipase inhibitors and new drugs used in the clinical treatment of obesity, it is of great significance to screen lipase inhibitors from traditional Chinese medicines (TCMs) via capillary electrophoresis. In this work, Fe 3 O 4 @TiO 2 nanoparticles was fabricated by solvothermal method and employed as an improved magnetic support to immobilize lipase through electrostatic interaction. By the method of transmission electron microscopy, fourier transform infrared spectroscopy and X-ray diffraction, the magnetic nanoparticles were characterized. The immobilized enzyme possessed advantages of a wider range for pH and temperature endurance, better storage stability and reusability. The kinetics performances of the immobilized lipase were studied. When p-Nitrophenyl palmitate (pNPP) was used as enzyme substrate, the Michaelis-Menten constant was calculated to be 2.51 mM and its inhibition constant for Orlistat was ascertained to be 13.41 μM. Ultimately, the established method was applied to lipase inhibitors screening from 6 Tibetan medicines with lipase inhibitory activity and Oxytropis falcate Bunge was screened out for its supreme lipase inhibitory activity. 11 compounds in the Oxytropis falcate Bunge were further screened, five compounds exhibited similar inhibitory activity to Orlistat, and one compound (kaempferol) presented better inhibitory activity than Orlistat, which is the most commonly used drugs to treat obesity in clinic. This work not only developed a method for new anti-obesity drugs discovery, but also provided inspiration for exploring new medicinal value of the TCMs.
研究领域:
药学
·
生物技术
·
中药学
·
药物发现
✓ 已验证
DOI
PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 3
·276-282
·
IF 0
Shan Yuyao,Wang Mengfan,Qi Wei,Su Rongxin,He Zhimin
Peptide bond synthesis is favorable to the production of bioactive small peptides. However, the abuse of toxic reagents remains an issue for chemical synthesis method, whereas the low product yield and purity limit the widespread use of enzymatic method. In this study, a new solid-phase enzymatic peptide synthesis (SPEPS) strategy was developed to produce an antioxidant tyrosine-alanine dipeptide (Tyr-Ala) by using recombinant carboxypeptidase Y (CPY) as the catalyst. The general SPEPS procedure involves three steps. First, the N-protected acyl donor was covalently attached to solid resin. Second, the peptide bond was condensed between the acyl donor and the nucleophile under the catalysis of CPY. Finally, one-step cleavage was performed to remove the protecting group and cleave the peptides from solid resin. Upon the optimization of reaction conditions, 77.92% (± 2.723%) yield of Tyr-Ala with high product purity of 90.971% (± 2.695%) was obtained. In addition, the antioxidant activity of Tyr-Ala was determined by ABTS method, indicating that the synthesized Tyr-Ala obtained by SPEPS showed a superior antioxidant capability compared with commercial glutathione.
研究领域:
生物技术
·
酶学
·
肽化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）