Journal of Bionic Engineering
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2023
·Vol. 20
·期 6
·2826-2839
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IF 4
Tian Hongli,Du Wenbo,Zhan Yuchao,Tian Limei,Zhao Jie,Sun Jiyu
In this study, an integrative bioinspired coating system for antifouling and corrosion resistance was investigated, in which self-healing nanocapsules (tung oil calcium alginate, TO@CA), doped polyaniline and nano-titanium dioxide nanocomposites (SPAn–TiO 2 ) and a biostructure metal surface were combined. The antifouling property of the bioinspired coating resulted from the synergistic antifouling effect of nano-TiO 2 and acid-doped polyaniline in SPAn–TiO 2 . The protonated nitrogen with a positive charge in SPAn–TiO 2 and the intrinsic bactericidal property of nano-TiO 2 could damage negatively charged single-celled chlorella, endowing the composite coating with good antifouling performance (less algae attached on the surfaces after a 90-day antifouling test and a conductivity test). The composite bioinspired coating had excellent corrosion resistance, which was due to the good synergistic anticorrosion barrier effect of SPAn–TiO 2 with TO@CA nanocapsules and the repairing ability of microcracks of TO@CA nanocapsules during the corrosion process. The bioinspired coating with 2 wt% SPAn–TiO 2 and 2 wt% TO@CA nanocapsules exhibited a better adhesion, corrosion resistance and antifouling performance than the other coatings did.
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MATERIALS RESEARCH BULLETIN
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2014
·
IF 1.968
Weixin Li,Junyou Yang,Jiaqi Zhang,Sheng Gao,Yubo Luo,Ming Liu
Ca-doped TiO 2 nanorod arrays were prepared via the one-step hydrothermal method successfully, and the effect of Ca ions content on the photovoltaic conversion efficiency of dye-sensitized solar cells has been fully discussed in the paper. Although no obvious change on the microstructure and morphology was observed by field emission scanning electron microscope and transmission electron microscope for the Ca-doped samples, the results of X-ray diffraction and X-ray photoelectron spectroscopy confirmed that Ti 4+ was substituted with Ca 2+ successfully. UV–vis spectroscopy results revealed that the flat band edge shifted positively by Ca ions doping. The photovoltaic conversion efficiency of the dye-sensitized solar cells based on the 2 mol% Ca-doped TiO 2 electrode was 43% higher than that of the undoped one due to the less recombination possibility.
研究领域:
材料科学
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能源科学
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Lucheng Li,Zehua Zhu,Jie Ni,Xiaojun Zuo
Phosphorus removal has been explored for a long time, however sustainable phosphorus adsorption and recovery with adsorbents recycling is rarely reported. This work proposes a sustainable phosphorus recycling route with calcium-modified powdered activated carbon with chitosan (Ca-PAC-CTS). The morphology, functional groups and crystal structure of Ca-PAC-CTS were characterized. The maximum phosphorus adsorption capacity was 16.73 mg/g Ca-PAC-CTS with Langmuir model at 298 K. Stable phosphorus sorption on Ca-PAC-CTS could be observed at the large range of pH (4– 10) when coexisting with NO 3 − , SO 4 2− , Cl − and F − , except HCO 3 − . 98.95 % The recovery of adsorbed phosphorus could get to 98.95 % using 0.05 M sulfuric acid solution, and the phosphate adsorption efficiency through Ca-PAC-CTS remained to be more than 80 % after five adsorption-desorption cycles, suggesting that Ca-PAC-CTS was one of the promising adsorbents for sustainable removal and recovery of phosphorus in aqueous solution.
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PubMed
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CHEMOSPHERE
·
2023
·
IF 8.8
Yuhang Cao,Xuewei Wu,Biqing Li,Xia Tang,Xueran Lin,Pengfei Li,Hang Chen,Fu Huang,Chaohai Wei,Jian Wei,Guanglei Qiu
Adsorption showed advantages in removing phosphorus (P) at low concentrations. Desirable adsorbents should have sufficiently high adsorption capacity and selectivity . In this study, a Ca–La layered double hydroxide (LDH) was synthesized for the first time by using a simple hydrothermal coprecipitation method for phosphate removal from wastewater. A maximum adsorption capacity of 194.04 mgP/g was achieved, ranking on the top of known LDHs. Adsorption kinetic experiments showed that 0.02 g/L Ca–La LDH could effectively reduce PO 4 3– P from 1.0 to <0.02 mg/L within 30 min. With the copresence of bicarbonate and sulfate at concentrations 17.1 and 35.7 times of that of PO 4 3– P, the Ca–La LDH showed promising selectivity towards phosphate (with a reduction in the adsorption capacity of <13.6%). In addition, four other (Mg–La, Co–La, Ni–La, and Cu–La) LDHs containing different divalent metal ions were synthesized by using the same coprecipitation method. Results showed much higher P adsorption performance of the Ca–La LDH than those LDHs. Field Emission Electron Microscopy (FE-SEM)-Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), and mesoporous analysis were performed to characterize and compare the adsorption mechanisms of different LDHs. The high adsorption capacity and selectivity of the Ca–La LDH were mainly explained by selective chemical adsorption, ion exchange, and inner sphere complexation.
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Environmental Technology & Innovation
·
2023
·
IF 7.1
Kaifeng Wang,Na Peng,Dongqing Zhang,Haijun Zhou,Jinfeng Gu,Jiahui Huang,Chen Liu,Yang Chen,Yang Liu,Jianteng Sun
This study investigated the adsorption performance of methylene blue using Ca(OH) 2 -modified biochar derived from agricultural and forestry wastes. The results showed that the modified rice straw biochar with 20% Ca(OH) 2 addition paralyzed at 500 °C exhibited the best adsorption performance for methylene blue. The adsorption data were fitted with four kinetic models and four isothermal adsorption models. Among which, the pseudo-second-order kinetic model and Langmuir isothermal model were the best fit, with high correlation coefficient of more than 0.99. The adsorption capacity of Langmuir fitting was 333.3 mg g −1 , which was 12.5 times higher than that for pristine rice straw biochar. The high adsorption capacity was maintained in a wide range of initial pH value of 4–12. SEM-EDX, organic element, surface structure, FTIR and XRD analysis indicated that Ca(OH) 2 modification significantly increased the polarity (higher O/C value), Ca content and the number of oxygen-containing functional groups (C-O and CO 3 2 − ) for pristine rice straw biochar, thereby substantially enhancing and improving the chemical adsorption of methylene blue. The adsorption mechanism involved for methylene blue included functional groups complexation, electrostatic interaction, ion exchange (mainly Ca 2＋ ) and π – π stacking. This study demonstrated that the modified rice straw biochar, as green and environmentally friendly raw material with cost-effectiveness, exhibited a great potential for broad application prospective subject to remediating printing and dyeing-contaminated wastewater.
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REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Xiao Li Li,Peng Liu,Bin Chu,Jin Mei He,Zhen Wang,Song Wang,Chang Sheng Chen,Xiao Hong Ge,Hui Li,Wei Qiang Liu
Myocardial infarction (MI) is a common heart emergency that potentially causes death. Injectable hydrogels with excellent malleability and filling properties are suitable for myocardial injection and can avoid the need for open surgery. In this study, dopamine grafted hyaluronic acid (HADOPA) was synthesized and combined with sodium alginate (Alg) and Ca 2+ -loaded liposomes (Ca-FVI) to prepare a series of injectable thermosensitive sodium hyaluronate/sodium alginate hydrogels (HADOPA/Ca-FVI/Alg). At 37 °C, the HADOPA/Ca-FVI/Alg solution rapidly changed from liquid to hydrogel because of the crosslinking between sodium alginate and the Ca 2+ released from Ca-FVI at a phase transition time of 100–200 s. The HADOPA/Ca-FVI/Alg scaffolds exhibited a porous 3D network structure, controlled porosity, and connected pore properties. Increasing the proportion of HADOPA increases the elasticity and absorbance of hydrogels. Experimental assessment showed that the hydrogels have good biocompatibility and that Alg1-HADOPA is more conducive to the adhesion, proliferation, and spreading of mouse cardiac myocytes while maintaining the best cell state. These findings suggest that HADOPA/Ca-FVI/Alg hydrogels improve cell proliferation and tissue repair, and that they are a promising therapeutic option for cardiac repair after MI.
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MATERIALS CHARACTERIZATION
·
2021
·
IF 4.342
Kangkang Yuan,Qing Cui,Jie Li,Xiaotong Jin,Chengshun Li,Xingxiang Ji,Zhongjian Tian,Xinqiang Wang
A compositionally complex (Ca, Sr, Ba)ZrO 3 (CC-CSBZ) fibrous membrane with perovskite structure was successfully prepared via a simple electrospinning method. The formation, phase transformation and microstructure evolution of CC-CSBZ fibers were fully discussed. X-ray diffraction, Raman spectra and transmission electron microscopy analyses confirmed the formation and phase transformation of CC-CSBZ solid solution at high temperatures. Scanning electron microscopy results indicated that a slower grain growth rate and more stable high-temperature microstructure were achieved for CC-CSBZ fibers compared with previous BaZrO 3 and CaZrO 3 fibers. CC-CSBZ fibrous membrane also exhibited excellent flexibility at 1000 °C and high thermal stability at 1200 °C. Furthermore, an average near infrared reflectivity of 98% at least at room temperature was obtained for CC-CSBZ fibrous membrane heat-treated from 800 to 1400 °C. For the slow grain growth rate, excellent high-temperature stability and near infrared reflectance, CC-CSBZ fibrous membrane would be a promising and novel ceramic fiber product for high temperature applications.
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FUEL
·
2020
·
IF 5.578
Hongliang Li,Hua Han,Yue Wang,Xianshu Dong,Hongli Yang,Minqiang Fan,Yang Hu,Zeyu Feng
In coal beneficiation, the clean coal would be easily contaminated with the super fine montmorillonite particles coating on it. This interaction between coal (hydrophobic) and montmorillonite (hydrophilic) surfaces is the interactions between the asymmetric systems. Previous studies detected the force between the montmorillonite and graphite or between the montmorillonite mounted tip and coal substrate to represent the interactions between 001 surface and coal. However, there is still lack of experimental direct measurement on the interaction between montmorillonite 001 surface and coal macerals. In this study, proposes methods for determinine the interactions between coal macerals and 001 surface of Na-, K- and Ca- montmorillonite directly by using an atomic force microscope (AFM). The results indicate that the 001 surface of Na- and Ca- montmorillonite served as the chaotropic and kosmotropic surface when it is adjacent to coal surfaces, with an attractive force and repulsive force occurring between them, respectively. The 001 surface of K-montmorillonite served as the chaotropic surface and kosmotropic surface while it is close to liptinite and inertinite, respectively. This chaotropic or kosmotropic property of the surface is determined by the coordination number of the cations and wettability of the hydrophobic surface simultaneously.
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International Journal of Applied Ceramic Technology
·
2020
·Vol. 18
·期 3
·684-696
·
IF 1.762
Zhengkun Cai,Minjin Jiang,Qianqian Guo,Xiaosong Jiang,Song Chen,Hongliang Sun
High-density chromium deficient calcium-doped lanthanum chromite-based ceramics (La 0.8 Ca 0.2 Cr 0.98 O 3 ) were prepared by hot pressing (HP) at different sintering pressures, and the highest density can reach 98.8%. The effects of sintering pressure on the microstructure, mechanical properties, and electrical conductivity of La 0.8 Ca 0.2 Cr 0.98 O 3 materials were studied. The experimental results show that HP can increase the density of lanthanum chromite-based ceramic materials and significantly inhibit the growth of grain size. As the sintering pressure increases, the strength and hardness gradually increase, but the fracture toughness decreases. When the sintering pressure is greater than 58 MPa, the presence of the second phase CaCr 2 O 4 can be detected in the XRD results of the sintered ceramics. The SEM results showed that CaCr 2 O 4 had two completely different morphologies in the sintered ceramics, and it was initially speculated that the possible causes were due to two different generation pathways. The electrical conductivity decreases with increasing sintering pressure, whereas the maximum electrical conductivity obtained is 18.61 S/cm in vacuum at 800°C for pressureless sintering ceramic.
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Science Advances
·
2020
·Vol. 6
·期 32
·
IF 13.117
Lingling Ma,Yanling Zhou,Zhaowenbin Zhang,Yaqin Liu,Dong Zhai,Hui Zhuang,Qin Li,Jianding Yuye,Chengtie Wu,Jiang Chang
Photothermal therapy (PTT), an emerging tumor treatment technology, has attracted tremendous interest, but excessive heat will cause damage to surrounding healthy tissues. Therefore, in situ temperature monitoring during PTT is of great importance to determine optimal treatment temperature and repair heat-damaged normal tissues. Here, we report the preparation of multifunctional Nd-Ca-Si silicate glasses and glass/alginate composite hydrogels that not only have photothermal property but also emit fluorescence under 808-nm laser irradiation, and its fluorescence intensity is linearly correlated with in situ temperature. With this feature, optimal PTT temperature for effective tumor treatment with minimal normal tissue damage can be obtained. In addition, because of the bioactive silicate components, the composite hydrogel has bioactivity to repair heat damage caused by PTT. This implantable multifunctional material with unique temperature monitoring, photothermal function, and wound healing bioactivity can be used for localized thermal therapy.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 5
·776-783
·
IF 2.69
Liu Xinghao,Hu Shuheng,Xu Di,Shao Dadong
Uranium (VI), as a toxic contaminant, is a potential detriment to human health and environmental safety. In this experiment, carboxymethyl cellulose/Ca-rectorite composite material (Ca-REC/CMC) was prepared by crosslinking reaction to remove U(VI) from the liquid. The crystal structure was detected by X-ray diffraction (XRD) and surface structure and morphology of the materials were investigated by scanning electron microscopy (SEM). The surface functional groups of prepared materials were detected by Fourier transform infrared spectroscopy (FT-IR). The adsorption capacity of Ca-REC/CMC improved obviously after being modified by CMC. The adsorption capacity of Ca-REC/CMC was closely related to ionic strength and pH. According to thermodynamic parameter calculation, the adsorption process was endothermic and spontaneous. Adsorption isotherms could be depicted perfectly by the Langmuir model. Ca-REC/CMC maintained stability and regeneration after recycling six times. The adsorption mechanism, including electrostatic interactions and ionic interaction, was investigated by the X-ray photoelectron spectroscopy (XPS). Ca-REC/CMC is considered as remarkable potential material for removing U(VI) from the water environment.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1385-1391
·
IF 3.917
Cao Xinwang,Zhu Mengting,Fan Fangwei,Yang Yinzhi,Zhang Qiang,Chen Yiren,Wang Xin,Deng Zhongmin
In this study, all-cellulose nanocomposites were developed by depositing one-dimensional jute cellulose nanowhiskers on a hydrolyzed two dimensional electrospun nanofibrous membrane via an immersion-drying process. The prepared nanocomposites were characterized by Fourier Transform Infrared, field emission scanning electron microscope, thermal gravimetric analysis, Brunauer, Emmett and Teller specific surface area, and mechanical properties. The versatile all-cellulose nanocomposites have the potential to be used in ultrafiltration, medical application, catalyst supports, etc.
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危险品化学品经营许可证（带存储）