JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-8
·
IF 2.278
Ren Yanlin,Zhao Qidong,Li Xinyong,Xiong Wei,Tade Moses,Liu Lihong
A novel visible-light-activated photocatalyst consisting of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles were synthesized through a tunable in situ deposition method. The morphology and microstructure of the C 3 N 4 /Ag 3 PO 4 nanocomposites were carefully characterized by scanning electron microscope, TEM, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectra, and so on. The porous C 3 N 4 /Ag 3 PO 4 nanocomposites were featured by the typical platelet-like morphology, with an average crystallite size of about 39 nm. The coexistence of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles is confirmed via the XRD and EDX results. Owing to its narrower band gap of Ag 3 PO 4 , the nanocomposites displayed a significant redshift of UV–Vis spectral absorption edge together with expanded light absorption in comparison with g-C 3 N 4 nanosheets. The photocatalytic activity of the prepared C 3 N 4 /Ag 3 PO 4 nanocomposites is demonstrated by the photodegradation of 4-chlorophenol (4-CP). The C 3 N 4 /Ag 3 PO 4 nanocomposites displayed higher photocatalytic activity than pure C 3 N 4 or Ag 3 PO 4 , which could be attributed to the interfacial effect of the nanocomposites in inhibiting the unfavorable recombination of photogenerated electrons and holes. Electron spin resonance spin-trap study implied that the generation of hydroxyl radicals plays the key role in the photodegradation of 4-CP by the C 3 N 4 /Ag 3 PO 4 nanocomposites under visible light irradiation.
研究领域:
材料科学
·
环境化学
·
纳米技术
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光催化
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污染治理
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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 37
·21323-21331
·
IF 12.732
Muya Cai,Zhuqing Zhao,Jiakang Qu,Qiang Ma,Xin Qu,Lei Guo,Hongwei Xie,Dihua Wang,Huayi Yin
Metallothermically reducing silica to nano-silicon is an energy-effective and straightforward way using low-cost raw materials. Herein, we report a scalable technique to produce nano-Si particles from SiO2 with the assistance of AlCl3, using zinc (Zn) as the reductant, and Zn can be recovered by electrochemical deposition in an aqueous solution. Thermodynamically, the reactivity of metal reductants should be higher than that of Si. However, opposing the thermodynamic rule, SiO2 can be reduced to Si by Zn that is less reactive than Si. The underlying mechanism of the abnormal spontaneous zincothermic reduction reaction stems from the existence of AlCl3 acting as a chlorination agent that first transforms SiO2 into SiCl4, which is subsequently reduced by Zn. Thus, the reaction of AlCl3-assisted metallothermic reduction of SiO2 is herein revealed for the first time, which is termed the chlorination–reduction reaction that obeys the thermodynamic rule. The revealed chlorination–reduction mechanism can explain the reason why the AlCl3 additive can enable the metallothermic reduction of SiO2 at such a low temperature of 250 °C. Moreover, the obtained nano-Si delivers a specific discharge capacity of 1450 mA h g−1 at 2 A g−1 after 400 cycles. Overall, this paper expands the choice of reductants and provides new insights into understanding the AlCl3-assisted metallothermic reduction of SiO2.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chenhui Yao,Yongqing Zhang,Meimei Du,Xiaodong Du,Shaobin Huang
Persistent organic pollutants (POPs) are widely distributed and have significant negative environmental impacts. Advanced oxidation processes (AOPs) based on sulfate radicals produced from persulfate (PS) have attracted considerable attention for the degradation of POPs, however, there are several disadvantages with these radical activation systems. This study examined the degradation of p -chloroaniline (PCA) by persulfate (PS) activated with activated carbon (AC). The effects of initial pH and dosage of AC were also investigated. Results showed that AC exhibits good catalytic activity toward PS. Increasing AC dosage significantly improved the PCA degradation rate but PCA removal was not obviously influenced by initial pH ranging from 3 to 9. PS activation in the PS/AC system was a non-radical process as demonstrated by (i) ethanol and tert -butyl alcohol having little effect on PCA removal and (ii) Electron Paramagnetic Resonance results showing no radicals signals in the PS/AC system. Results also demonstrated that TOC could be removed in PS oxidation and PCA dechlorination was rapid (in the initial 30 min). The three major intermediates identified during the PCA degradation in the non-radical oxidation process were N-(4-chloro-phenyl)-benzene-1,4-diamine, 4-chloro-phenyl-diazene and hydroquinone and two pathways of PCA degradation was proposed. This study proposes a new insights into the mechanism of PS activation by AC and an efficient method for POPs removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Yun Luo,Baoqin Zhang,Ningbo Geng,Shuai Sun,Xiaoyao Song,Jiping Chen,Haijun Zhang
The toxicity of pyrene (Pyr) and its chlorinated species have not be comprehensively and clearly elucidated. In this study, an integrated approach of metabolomics and transcriptomics were applied to evaluate the hepatotoxicity of Pyr and 1-chloropyrene (1-Cl-Pyr) at human exposure level, using human L02 hepatocytes. After 24 h exposure to Pyr and 1-Cl-Pyr at 5–500 nM, cell viability was not significantly changed. Transcriptomics results showed that exposure to Pyr and 1-Cl-Pyr at 5 and 50 nM obviously altered the gene expression profiles, but did not significantly induce the expression of genes strongly related to the activation of aryl hydrocarbon receptor (AhR), such as CYP1A1 , CYP1B1, AHR, ARNT . Pyr and 1-Cl-Pyr both induced a notable metabolic perturbation to L02 cells. Glycerophospholipid metabolism was found to be the most significantly perturbed pathway after exposure to Pyr and 1-Cl-Pyr, indicating their potential damage to the cell membrane. The other significantly perturbed pathways were identified to be oxidative phosphorylation (OXPHOS), glycolysis, and fatty acid β oxidation, all of which are related to energy production. Exposure to Pyr at 5 and 50 nM induced the up-regulation of fatty acid β oxidation and OXPHOS. The similar result was observed after exposure to 5 nM 1-Cl-Pyr. In contrast, exposure to 50 nM 1-Cl-Pyr induced the down-regulation of OXPHOS by inhibiting the activity of complex I. The obtained results suggested that the modes of action of Pyr and 1-Cl-Pyr on energy production remarkably varied not only with molecular structure change but also with exposure concentration.
研究领域:
环境科学
·
毒理学
·
生物信息学
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yicheng Hou,Jun Qiu,Wei Wang,Xibo He,Mubashar Ayyub,Yong Shuai
The thermal energy storage (TES) technology based on high-temperature molten salt is playing an increasingly important role in advanced solar energy utilization and waste heat recovery. However, the high corrosivity and low thermal conductivity of molten salt have limited the efficient application of TES systems . This work reports a facile and novel sacrificial paraffin template method , aiming to create Al 2 O 3 ceramic macrocapsules with topology-optimized structural cavities by paraffin blocks with a reverse-designed structure for macro-encapsulating molten salt. The objective function of the maximum thermal conductivity of the design domain is calculated by a topology-optimized method to optimize the layout of high conductive ceramics. Among them, the optimized macrocapsules with a volume ratio of 25 % ceramic (S 25 ) have a 62.8 % reduction in charging time and a 101.5 % increase in charging rate. Furthermore, after being filled with eutectic chloride salt, S 25 could present a satisfactory heat storage density of 272.58 J∙g −1 and 748.3 J∙cm −3 at the temperature range of 550–750 °C. The macrocapsules also show good thermal cycling stability without degradation of thermophysical properties after hundred cycles. These improved results demonstrate the potential application of the macrocapsule in high-temperature TES systems.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
Journal of Building Engineering
·
2023
·
IF 6.4
Ting Zhang,Hongbo Tan,Jian Ni,Baoguo Ma,Xiaohai Liu,Pian Chen,Tao Shi
To lower the corrosion hazards of the steel bar in reinforced concrete, binding chloride ion by producing Cl-AFm is an effective way. In the presence of calcium ions and sulfate ions, Cl-AFm could transform into ettringite , and release the chloride ions into pore solution , with negative effect on reinforced concrete. In order to avoid the negative effect, barium ion was introduced to preferentially precipitate the sulfate ions. In this study, the effect of barium ion on the transformation reaction of ettringite into Cl-AFm was studied, and the combination effect of barium ion and sulfate ion on chloride binding was discussed. The results showed that barium ion could improve the chloride binding capacity of ettringite. The mechanism was that barium ion could be precipitated by sulfate from AFt to form BaSO 4 , and then result in the formation of Cl-AFm.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wanqing Zhang,Zhongyin Zhang,Yuanchao Li,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A novel MIL-101(Cr)/XC-72 modified glassy carbon electrode (GCE) sensor was fabricated to determine chloramphenicol (CAP). The electrochemical sensors were constructed by using MIL-101(Cr), XC-72, MIL-101(Cr)/XC-72, and their electrochemical performances were studied with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. In comparison with the GCE , MIL-101(Cr)/GCE and XC-72/GCE sensors, the MIL-101(Cr)/XC-72/GCE sensor exhibited a well-defined redox peak towards CAP in phosphate buffer solution (PBS). The effects of the ratio of MIL-101(Cr) and XC-72, accumulation time, scan rate, and pH value were carefully considered. Under the optimized conditions, the sensor exhibited excellent response for CAP. The linear concentration ranges of CAP were from 1.0 × 10 −8 to 2.0 × 10 −5 M (R 2 = 0.985), with a low detection limit of 1.5 × 10 −9 M (S/N = 3). Furthermore, the MIL-101(Cr)/XC-72/GCE sensor was successfully applied to the determination of the real samples with satisfactory recoveries.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 21
·2201081
·
IF 10.05
Ranyun Wu,Yingmeng Liu,Sanlue Hu,Pengfei Fu,Zewen Xiao
Recently, A 2 BX 6 -type halide perovskite variant phosphors have been applied for white light-emitting diodes (LEDs) due to their superior photoluminescence properties, excellent stability, and low-cost solution-processability. However, the reported white LEDs, particularly the all-A 2 BX 6 white LEDs, exhibit insufficient color rendering due to the shortage of red light. In this work, through a rational material design, a red-emitting perovskite variant Cs 2 PtCl 6 phosphor is developed. The synthesized Cs 2 PtCl 6 powders exhibit a relatively narrow bandgap of 2.91 eV and an intrinsic broadband red emission centered at 670 nm, which is attributed to the triplet self-trapped excitons associated with the Jahn−Teller-distorted [PtCl 6 ] 2− octahedra in the excited state. Using Cs 2 PtCl 6 as the red phosphor component, an all-A 2 BX 6 white LED is constructed, achieving a standard white light with a Commission Internationale de l'Eclairage chromaticity coordinate of (0.33, 0.33), a correlated color temperature of 5318 K, and a record high color rendering index of 90. This work represents a significant step toward the application of A 2 BX 6 perovskite variant phosphors for solid-state lighting.
研究领域:
材料科学
·
光学工程
·
发光材料
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DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 12
·1456
·
IF 3.52
Yujie Fu,You Zhang,Qi Xin,Zhong Zheng,Yu Zhang,Yang Yang,Shaojun Liu,Xiao Zhang,Chenghang Zheng,Xiang Gao
Chlorinated volatile organic compounds (CVOCs) are vital environmental concerns due to their low biodegradability and long-term persistence. Catalytic combustion technology is one of the more commonly used technologies for the treatment of CVOCs. Catalysts with high low-temperature activity, superior selectivity of non-toxic products, and resistance to chlorine poisoning are desirable. Here we adopted a plasma treatment method to synthesize a tin-doped titania loaded with ruthenium dioxide (RuO2) catalyst, possessing enhanced activity (T90%, the temperature at which 90% of dichloromethane (DCM) is decomposed, is 262 °C) compared to the catalyst prepared by the conventional calcination method. As revealed by transmission electron microscopy, X-ray diffraction, N2adsorption, X-ray photoelectron spectroscopy, and hydrogen temperature-programmed reduction, the high surface area of the tin-doped titania catalyst and the enhanced dispersion and surface oxidation of RuO2induced by plasma treatment were found to be the main factors determining excellent catalytic activities.
研究领域:
环境科学
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Huan Fu,Chengjian Zhang,Hui Wang,Binyang Du,Jingjing Nie,Junhui Xu,Liuping Chen
Polymer-based aqueous redox flow batteries (RFBs) have emerged as a promising technology for large-scale energy storage. The development of novel polymeric electrode materials with high aqueous solubility to enhance the capacity and stability of batteries is the foremost concern of this area, yet remains challenging. Here we describe a stable polymer-based aqueous RFB assembled in air atmosphere, which uses a low-cost anionic terpolymer ( P4 ) as the active cathode material , N , N ′-dimethyl-4,4′-bipyridinium dichloride ( MV ) as the anode material , and environmentally benign aqueous NaCl solution (NaCl aq ) as the electrolyte. P4 exhibits high solubility (28.8 Ah L −1 ) and low viscosity in 1.5 M NaCl aq . The theoretical storage capacity of such stable RFB is as high as 12 Ah L −1 . At the current density of 10 mA cm −2 and over 170 consecutive cycles in air atmosphere at room temperature , the P4/MV RFB exhibits the actual energy density of 6.43 Wh L −1 , the material utilization of 71.3%, Coulombic efficiency over 95%, and the average attenuation per cycle of 0.12%.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2016
·
IF 1.276
Jing Y. Yang,Liang Yan,Shao P. Li,Xin R. Xu
The aging oily wastewater (AOW) from Tarim oilfield in China was treated by demulsification/flocculation. A novel sewage treatment agent (YL-7) was developed using a cationic surfactant (LY) and flocculants (polydimethyl diallyl ammonium chloride (PDMDAAC)/polyaluminum chloride (PAC)). At an YL-7 dosage of 320 mg L−1 at 323 K for 90 min, the oil content of AOW was reduced from 728.8 mg L−1 to 23.7 mg L−1, and oil removal efficiency reached 96.7%. Microorganism flocs (extracted from AOW) with high negative zeta potential enhanced the stability of oil/water emulsion. LY and PDMDAAC neutralized the negative charge on the oil droplet surface. PDMDAAC and PAC mainly bridged and swept flocs during the flocculation process. YL-7 was found to be a suitable sewage treatment agent in removing oil from AOW.
研究领域:
环境工程
·
水处理
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Yong Tang,Yuanyuan Li,Lei Liu,Haocheng Ni,Juan Han,Lei Wang,Yanli Mao,Liang Ni,Yun Wang
A simple colorimetric and fluorescent probe bearing coumarin and p-toluenesulfonyl hydrazide moieties was developed, which was capable of displaying excellent selectivity for hypochlorite. The distinct absorption spectral shift (49 nm) was induced by ClO − -triggered oxidative hydrolysis of C N double bonds in aqueous solution, which was accompanied by the optical variation from yellow to colorless. Besides, this probe solution underwent a dramatic intensification (162-fold) of the fluorescence signaling at 444 nm via the addition of ClO − (3 equiv.) within a short time. More importantly, the results achieved by fluorescence spectra revealed an excellent linear relation of probe 1 for ClO − with excellent sensitivity (9.1 nM). Further, the good recoveries and cellular experiments verified the prospective functions of this probe in real water environment and SW 480 cells.
研究领域:
生物化学
·
分析化学
·
医学检测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）