Journal of Environmental Sciences
·
2022
·
IF 6.796
Chenxiao Qi,Haixiang Chen,Xiufang Chen,Chengyu Chu,Xueting Mei,Wangyang Lu,Nan Li
Graphite carbon nitride has many excellent properties as a two-dimensional semiconductor material so that it has a wide application prospect in the field of photocatalysis . However, the traditional problems such as high recombination rate of photogenerated carriers limit its application. In this work, we introduce nitrogen deficiency into g-C 3 N 4 to solve this problem a simple and safe in-situ reduction method. g-C 3 N 4 /CaCO 3 was obtained by a simple and safe one-step calcination method with industrial-grade micron particles CaCO 3 . Cyano group modification was in-situ reduced during the thermal polymerization process, which would change the internal electronic structure of g-C 3 N 4 . The successful combination of g-C 3 N 4 and CaCO 3 and the introduction of cyanide have been proved by Fourier transform infrared spectroscopy and X-ray photoelectron spectrometer. The formation of the cyano group, an electron-absorbing group, promotes the effective separation of photogenic electron hole pairs and inhibits the recombination of photogenic carriers. These advantages result in the generation of more •O 2 − and 1 O 2 in the catalytic system, which increases the photocatalytic efficiency of nicotine degradation by ten times. Furthermore, the degradation process of nicotine has been studied in this work to provide a basis for the degradation of nicotine organic pollutants in the air.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yilin Wu,Wendong Xing,Junzhi Yan,Jiuyun Cui,Faguang Ma,Jia Gao,Jian Lu,Chao Yu,Ming Yan
In spite of the intense efforts in selective separation field, the utilization and preparation of membrane-associated molecularly imprinted membranes with both enhanced rebinding capacities and high permselectivity performance still remain strong challenges. Herein, the bioinspired PDA-modified porous regenerated cellulose membrane (pRCMs) with mineral-coated multilevel structure was first proposed for the preparation of PDA/CaCO 3 -based imprinted nanocomposite membranes (PCIMs), m-cresol was chosen as the template molecule. Importantly, this bioinspired methodology was redeveloped and optimized to obtain abundant and uniformly distributed CaCO 3 nanocomposite on the surfaces of PDA@pRCMs. The as-designed sandwich-like imprinting structure were then constructed on PDA/CaCO 3 -based surfaces by developing a simple sol-gel imprinting process. Attributing to the design of the uniform CaCO 3 /PDA@pRCMs surfaces, amount of m-cresol-imprinted sites and permeation selectivity could be both optimized, it was no surprise that more excellent rebinding capacity (97.4 mg g −1 ), fast adsorption kinetics and high permselectivity coefficients (more than 13) were successfully achieved. Importantly, the whole synthesis process was conducted without complicated procedures and polluting the environment. Finally, the experimental results mentioned above, together with the green synthesis processes strongly demonstrated that our synthesis methodology of PCIMs had great potential for applications in various fields of selective separation, chemical industry, environment, biological medicine and so on.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiaoyan Zhao,Yongcheng Zhou,Hua Guo,Yuqi Zhai,Xianrui Zou,Donghui Wang
Titanium dioxide (TiO 2 ) has received widespread attention as high stability, low toxicity and costless photocatalyst , but it only exhibits photocatalytic activity under ultraviolet (UV) light. To improve TiO 2 photocatalytic efficiency, Bio-CaCO 3 /WO 3 /TiO 2 /(Ca,Y)F 2 :Tm,Yb was prepared. TiO 2 was combined with upconversion materials, coupled with WO 3 and loaded on oyster shell powder (Bio-CaCO 3 ), which showed that the prepared photocatalyst effectively reduce the band gap of TiO 2 , expand the photoreaction range of the material and avoid agglomeration, thus improving its photocatalytic efficiency and antibacterial efficiency. The photocatalytic degradation efficiency of Bio-CaCO 3 /WO 3 /TiO 2 /(Ca,Y)F 2 :Tm,Yb (50 mg) was 24.32% higher than that of TiO 2 /(Ca,Y)F 2 :Tm,Yb in 90 min. And its antibacterial rates against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were enhanced by 38.68% and 25.89% compared to TiO 2 /(Ca,Y)F 2 :Tm,Yb, respectively.
研究领域:
材料科学
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环境科学
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生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yi Fang,Yingjie Li,Youhao Zhang,Yuzhuo Wang,Zirui He,Kuihua Han,Jun Jie Wu
CaO/CaCO 3 energy storage is a promising technology to solve the intermittency of solar energy. Fluidized-bed reactors serve as crucial devices for calcination and carbonation in CaO/CaCO 3 energy storage system . This work presents the first observation of defluidization occurring in CaO/CaCO 3 energy storage process. The mechanism of defluidization was investigated through the exothermic experiment and computational fluid dynamics-discrete element method. Furthermore, the defluidization in the exothermic stage was mitigated by simultaneous nano-silica coating and SiO 2 fines addition. The result indicates that high CO 2 concentration (>80 %), small particle size (0.075–0.18 mm) and low initial bed temperature (700–800 °C) result in the defluidization. The defluidization leads to low exothermic performance of CaO particles and serious uneven temperature distribution in the exothermic stage during CaO/CaCO 3 energy storage process. The simulation result indicates that carbonation proceeding at zero-order kinetics leads to rapid CO 2 absorption in the emulsion phase . The absorption of CO 2 in the emulsion phase surpasses the replenishment of CO 2 from the bubbles, resulting in the contraction of the emulsion phase, which is the cause of defluidization in the exothermic stage. The combination of nano-silica coating for CaO and SiO 2 fines addition enhances the porosity in the emulsion phase, thereby facilitating the diffusion of CO 2 from the bubbles into the emulsion phase. Thus, the defluidization of CaO particles is eliminated by simultaneously coating with 5 wt% nano-silica and adding 3 wt% SiO 2 fines (50–75 μm). After this improvement in fluidization , the bed temperature difference is only 12 % of that in defluidization. Furthermore, the effective conversion of CaO particles increases by 10 % compared with that in defluidization. These findings are helpful for solving the defluidization of CaO particles in CaO/CaCO 3 energy process.
研究领域:
能源存储
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Li Zhang,Kun-kun Deng,Kai-bo Nie,Cui-ju Wang,Chao Xu,Quan-xin Shi,Yu Liu,Jie Wang
Summary Incorporating graphite/graphene into a Mg alloy matrix is a promising approach for developing lightweight heat dissipation materials. However, carbon material is inherently incompatible with Mg because of their distinctly different surface characteristics, resulting in the challenge of composite fabricating and interface controlling. Herein, a new strategy of in situ interfacial modification was proposed to achieve excellent thermal conductivity and mechanical properties in graphite/Mg composites. A super-nano CaCO 3 interfacial layer was reported in this paper. The detailed interfacial structure, reaction thermodynamics and kinetics, and interface strengthening mechanisms were analyzed and discussed. Several preferential epitaxial relationships of the Mg/CaCO 3 interface were revealed, which are conducive to minimize the interfacial energy, stabilize and strengthen the interface. Moreover, strong ionic bond of graphite/CaCO 3 interface was demonstrated. The strong chemical interface bonding of graphite-Mg via in situ interface modification facilitates both the interfacial cohesion and interfacial thermal conduction, which endows the graphite/Mg composites with superior strength–thermal conductivity synergy.
研究领域:
材料科学
·
热管理材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2013
·
IF 4.093
Jun Shi,Jin Shi,Chao Du,Qun Chen,Shaokui Cao
Alginate/CaCO 3 hybrid membranes with pH- and thermal-responsive drug release properties were prepared under compressed CO 2 using polyacrylic acid (PAA) as a crystal growth additive. Aliphatic poly(urethane-amine) (PUA) was employed as the thermal-responsive composition in the hybrid membranes. The hybrid membranes were characterized by scanning electron microscopy, energy dispersive X-ray spectrometer, X-ray diffraction and thermogravimetric analyzer. The interaction between PAA and aliphatic PUA contributed the formation of compact CaCO 3 microparticles and the high drug loading efficiency of the hybrid membranes. By adjusting the pressure and reaction time of the biomineralization process, sustained drug release property could be achieved from the hybrid membranes. The results indicated that the compact CaCO 3 microparticles could hinder the permeability of the encapsulated drug and reduce the drug release effectively. Moreover, the thermal-sensitivity of aliphatic PUA and pH-sensitivity of alginate matrix would preserve after the biomineralization process.
研究领域:
材料科学
·
药学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2024
·
IF 10.8
Shuo Yang,Zhicheng Tang,Shiming Gao,Liwu Mo,Duyou Lu
Carbonation degree significantly impacts the volume stability of steel slag powder. To elevate the carbonation efficiency of steel slag and thereby alleviate the volume unsoundness of steel slag powder, sodium tripolyphosphate (STP) was used to enhance the micro morphology of CaCO 3 and accelerate Ca leaching and CO 2 diffusion. Three methods for assessing CO 2 uptake were employed to reliably determine the degree of carbonation. Results indicate that steel slag added with 0.05 wt% STP obtained a promotion exceeded 80 % in CO 2 uptake. Additionally, STP increased the CO 2 capture capacity of steel slag by 24.84 %. Under the influence of STP, the expansion of steel slag paste was reduced by up to 31.45 % following an autoclaving test. The formed micro CaCO 3 particles in carbonated steel slag without STP were polyhedral grains and a dense carbonation layer was formed around calcium silicate. Contrastively, CaCO 3 formed in the carbonated STP incorporated steel slag were conical or acicular particles and consequently generated a porous layer. The porous microstructure provided “tunnels” for the continuous CO 2 diffusion and Ca 2+ leaching and hence maintained relatively higher reaction speed throughout the carbonation process. Furthermore, STP also played the role as a chelator which accelerated the leaching of Ca 2+ .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xiaojuan Zhang,Edouard Asselin,Zhibao Li
The precipitation of CaCO3 and its kinetics for the CaCl2–CO2–Mg(OH)2–H2O system were systematically studied to develop a novel process for eliminating solid and liquid waste from the Solvay soda process. The effects of operating conditions including temperature, CaCl2 concentration, flow rate of CO2, and stirring speed on the reaction kinetics were experimentally determined. The results revealed that low temperature, high CO2 flow rate, and fast stirring speed can accelerate the reaction rate, and the mass transfer of CO2 is the controlling step. An MSMPR crystallizer was used to obtain the experimental crystal size distribution (CSD). A simplified population balance equation (PBE) was used to correlate the parameters on the basis of supersaturation. The soda solid and liquid wastes discharged from the Solvay industry were used as raw material to test the new process and validate the methodology. The precipitated CaCO3 consists of calcite or aragonite with high purity and uniform CSD. A double-effect evaporative-cooling crystallization process to recover MgCl2·6H2O and NaCl was simulated with help of Aspen plus and the electrolyte-NRTL (ELENRTL) model, suggesting economic benefits.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yuanwu Hu,Hongjie Cui,Zhenmin Cheng,Zhiming Zhou
CO 2 capture and sequestration is one of the viable solutions to reduce the CO 2 emissions from fossil fuel combustion, and sorption-enhanced water gas shift (SEWGS) is a promising technology for pre-combustion CO 2 capture. In this study, a novel alkali metal salt (AMS)-promoted MgO-CaCO 3 sorbent was applied to the SEWGS process, and this sorbent exhibited fast sorption rate, high capacity and good stability in 30 CO 2 capture cycles. Catalyst and sorbent particles were arranged in a layer-by-layer alternating configuration in the reactor. The effects of operating conditions such as temperature, pressure and initial H 2 O/CO molar ratio were investigated, and the thermodynamic equilibrium analyses of the CO 2 sorption on AMS-promoted MgO-CaCO 3 and the SEWGS process in the layered configuration were carried out, based on which the optimization of the reactor configuration was performed. A high-purity H 2 (99.4% in dry basis) was experimentally achieved in the SEWGS process at 573 K, 12 atm and an initial H 2 O/CO molar ratio of 1.5 with a three catalyst/sorbent layered configuration, and the cyclic stability was demonstrated over 10 consecutive SEWGS cycles.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2020
·
IF 1.539
Jinjing Xing,Yeqiang Cai,Yikun Wang,Haifu Zheng,Yujia Liu
CaCO3 nanoparticles are very suitable as intelligent carriers because of their ideal biocompatibility and biodegradability, especially their sensitivity to pH. In this paper, we use mesoporous CaCO3 nanoparticles as intelligent carrier, sodium alginate, and chitosan as alternating assembly materials, folic acid as target molecules, and exploit layer-by-layer assembly technology to achieve sensitive molecular targeting and pH response drug release. Mesoporous CaCO3 hybrid nanoparticles have high drug loading on doxorubicin. The effects of different pH values on drug release in vitro were studied by regulating simulated body fluids with different pH values. The cytotoxicity, targeting effect, and drug release of human cervical cancer cell line (HeLa) were studied by cell vitality and imaging experiments. All the evidence suggests that the smart mesoporous CaCO3 nanoparticles may be a potential clinical application platform for cancer therapy.
研究领域:
生物材料学
·
药剂学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2020
·Vol. 53
·期 24
·245401
·
IF 3.169
Jingyi Xue,Xiaolei Li,Qianli Li,Jiahong Lyu,Wei Wang,Lin Zhuang,Yue Xu
A novel magnetic drug-loaded osteoinductive Fe3O4/CaCO3 hybrid microspheres system (MDHMs) with excellent drug delivery property has been fabricated by a modified coprecipitation method. The MDHMs are uniform vaterite microspheres with well-defined mesoporous nanostructures. The formation of vaterite is based on the templating effect of casein micelles, which is promising in bone tissue engineering. Cyclodextrins (CDs) increase the porosity of the microspheres with a pore size of about 7.3 nm and a surface area of about 50.73 m2 g−1. The mesoporous structure gives the MDHMs great drug loading efficiency of about 80.75–88.74% and the minocycline-loaded MDHMs display a sustained drug release property (about 95% in 5 d). Moreover, the MDHMs also possess stable magnetic property with a saturation magnetization of about 4.41 emu g−1 and a remarkable magnetism-responsive behavior. These results demonstrate that with superior drug delivery property, osteoinductive potential and magnetic property, the MDHMs have a great potential in the treatment of peri-implantitis.
研究领域:
材料科学
·
药剂学
·
生物医学工程
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 6
·e4815
·
IF 3.259
Qiancheng Zou,Yi Wei,Shuai Wang,Jinyan Xie,Aihua Xu,Xiaoxia Li
The development of green and efficient catalysts for peroxymonosulfate (PMS) activation and organic pollutants degradation has received widespread attention. In this study, the hybrid CaCO 3 /OMS-2 catalysts were prepared by a simple precipitation approach and characterized by X-ray powder diffraction, N 2 adsorption–desorption, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and cyclic voltammetry. It was found that deposition of CaCO 3 on OMS-2 surface can weaken the Mn-O bond by formation of Ca-O-Mn bond. The interactions between CaCO 3 and OMS-2 significantly enhanced Acid Orange 7 degradation in the presence of PMS with a pseudo-first-order kinetic constant of 0.21 min −1 , which was much higher than those of OMS-2 (0.026 min −1 ) and CaCO 3 (0.021 min −1 ). The CaCO 3 /OMS catalysts were also much more efficient than other reported OMS-2 hybrid catalysts, and could be performed over a wide solution pH and for other organic dyes degradation. Sulfate and hydroxyl radicals were formed from the oxidation of low valent manganese species by PMS as the active species in the system. This study can provide a simple method for the design of efficient manganese-based hybrids for wastewater remediation via PMS activation.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）