CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Ning Zhang,Suting Zhong,Xiang Zhou,Wei Jiang,Tianhe Wang,Jiajun Fu
Poly (styrene-divinylbenzene) (P (St-DVB)) foams with porosity as high as 98% were prepared by the method of high internal phase emulsions (HIPEs) in one-step process. The materials exhibited superhydrophobicity and excellent oleophilicity, with the water contact angle (WCA) even exceeding 150° and oil contact angle approaching 0°. The materials fabricated with different types of Fe 3 O 4 particles had varied hierarchical pore structures. And the adsorption capacity of the monolithic foam towards chloroform was as high as 57 g/g. Importantly, the materials soaked with oil could be regenerated effectively by means of centrifugation with oil recovery rate reaching 90%. More importantly, the monolithic PolyHIPEs (polymers obtained by the polymerization of the HIPEs) were subjected to 20 adsorption-centrifugation cycles and superior reusability was demonstrated. These features achieved with PolyHIPEs made them ideal candidates for practical oil removal applications.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2017
·
IF 2.625
Zhilan Cai,Yuming Zhou,Shuaishuai Ma,Shiwei Li,Haiyong Yang,Shuo Zhao,Xi Zhong,Wenting Wu
A novel g-C 3 N 4 /CuS p - n heterostructured photocatalyst has been fabricated through an in situ synthesis technique. The samples were characterized through X-ray diffraction, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis spectroscopy. And the results indicated that CuS nanoparticles were closely anchored on the surface of g-C 3 N 4 with good dispersion. The g-C 3 N 4 /CuS heterojunctions exhibited enhanced photocatalytic performance in degradation of RhB and MB than that of pure g-C 3 N 4 and CuS, and the selected sample of g-C 3 N 4 /CuS-2 displayed the best photocatalytic activity. The degradation rates of RhB and MB with g-C 3 N 4 /CuS-2 photocatalyst were 8.914 and 13.543 times higher than that of pure g-C 3 N 4 , and 3.023 and 6.373 times higher than that of pure CuS, respectively. The enhancement of photocatalytic activity may be ascribed to the matched overlapping band structure and the interaction between CuS and g-C 3 N 4 . The interaction between g-C 3 N 4 and CuS would not only improve the optical absorption property of g-C 3 N 4 , but also create more interface for the efficiently transfer of photo-generated electron-hole pairs to restrict the recombination, which was proved by the photoluminescent spectra. Moreover, a possible photocatalytic mechanism has been tentatively proposed according to the experimental results.
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ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 31
·1702613
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IF 12.124
Liyan Yang,Feilong Cai,Yu Yan,Jinghai Li,Dan Liu,Andrew J. Pearson,Tao Wang
The π-conjugated organic small molecule 4,4′-cyclohexylidenebis[ N , N -bis(4-methylphenyl) benzenamine] (TAPC) has been explored as an efficient hole transport material to replace poly(3,4-ethylenedio-xythiophene):poly(styrenesulfonate) (PEDOT:PSS) in the preparation of p-i-n type CH 3 NH 3 PbI 3 perovskite solar cells. Smooth, uniform, and hydrophobic TAPC hole transport layers can be facilely deposited through solution casting without the need for any dopants. The power conversion efficiency of perovskite solar cells shows very weak TAPC layer thickness dependence across the range from 5 to 90 nm. Thermal annealing enables improved hole conductivity and efficient charge transport through an increase in TAPC crystallinity. The perovskite photoactive layer cast onto thermally annealed TAPC displays large grains and low residual PbI 2 , leading to a high charge recombination resistance. After optimization, a stabilized power conversion efficiency of 18.80% is achieved with marginal hysteresis, much higher than the value of 12.90% achieved using PEDOT:PSS. The TAPC-based devices also demonstrate superior stability compared with the PEDOT:PSS-based devices when stored in ambient circumstances, with a relatively high humidity ranging from 50 to 85%.
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BIOSENSORS & BIOELECTRONICS
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2017
·
IF 7.78
Xing Lu,Yiwen Yang,Yanbo Zeng,Lei Li,Xiaohua Wu
Rapid and efficient detecting trace amount of environmental p -nitroaniline ( p -NA) is in urgent need for security concerns and pollution supervision. In this work we report the use of molecularly imprinted polymeric ionic liquid (MIPIL) microspheres to construct recognizable surfaces for detection of p -NA through fluorescence quenching . The p -NA imprinted microspheres are synthesized by precipitation polymerization upon co-polymerization of 3-(anthracen-9-ylmethyl)-1-vinyl-1H-imidazol-3-ium chloride (Fluorescent IL monomer) with ethyleneglycol dimethacrylate (EGDMA). The electron-rich group alkenyl imidazole in IL functional monomer can dramatically improve the emission of anthracene fluorophore and the π-π stacking, electronic, and hydrogen bond between p -NA and MIPIL can efficiently enhance the selective recognition force. The as-synthesized MIPIL microspheres present spherical shape, high fluorescence emission intensity and specific recognition, which showed rapid detection rate (1 min), stable reusable property (at least 4 time recycles), wonderful selectivity over several structural analogs, wide linear range (10 nM to 10 M) with a correlation coefficient of 0.992, and excellent sensitivity (LOD, 9 nM). As synthesis and surface functionalization of MIPIL microspheres are well established, the methods reported in this work are facile, rapid and efficient for monitoring p -NA in environmental wastewater.
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Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 5
·907-916
·
IF 4.872
Yiming Liu,Xiaole Peng,Kun Qian,Yingying Ma,Jiangshan Wan,Han Li,Hongsen Zhang,Guofeng Zhou,Bin Xiong,Yanbing Zhao,Chuansheng Zheng,Xiangliang Yang
Temperature sensitive p(N-isopropylacrylamide-co-acrylic acid) modified gold nanoparticles (GNP@PNA) were prepared via coordination bonding between gold and sulfur elements. Their diameter and zeta potential were 86 nm and −26.2 mV at 25 °C, and 47 nm and −30.5 mV at 37 °C respectively. Thermogravimetric characterization of GNP@PNA indicated that the PNA shell and the GNP core accounted for 19.2 wt% and 78.2 wt%, namely ca. 70–80 chains of PNA were combined on the surface of one GNP nanoparticle. GNP@PNA showed much better X-ray attenuation ability, ca. 1.6–3.3 times higher than that of Omnipaque. In addition, the temperature sensitive sol–gel transition of GNP@PNA dispersions could realize the so-called “in situ casting” embolization from tumoral aorta to peripheral arteries, and improve their angiographic ability owing to the inhibition against GNP aggregation via gelation. Renal artery embolization on normal rabbits and TAE on VX2 tumor-bearing rabbits indicated that GNP@PNA achieved better embolization for longer times than Ivalon and Lipiodol. Excellent biocompatibility of GNP@PNA dispersions was also observed via the evaluation of cytotoxicity, hemolysis and hepatorenal function.
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CHINESE JOURNAL OF CATALYSIS
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2016
·
IF 2.628
Xiaogang Su,Yingfang Yao,Juan Tian,Jianguo Liu,Zhongwei Wang,Yong You,Lin Huang,Congping Wu
Nitrogen-doped carbon materials exhibiting high oxygen reduction reaction activity were prepared via the pyrolysis of a poly- p -phenylenediamine/carbon black composite. The as-synthesized catalyst showed excellent catalytic activity in alkaline solution, and outperformed commercial Pt/C in KOH solution (0.1 mol/L), as demonstrated by the higher current density and the more positive half-wave potential. Scanning electron microscopy and N 2 adsorption-desorption analyses indicated that a composite structure, in which the N-rich surface of the poly- p -phenylenediamine had an increased active center concentration and the high external surface area of the carbon black was conducive to the mass transport, is highly beneficial in terms of promoting the oxygen reduction reaction. However, the activity of this catalyst underwent an obvious decrease following exposure to air for 30 d. X-ray photoelectron spectroscopy showed that the oxygen content in the catalyst was increased by prolonged air exposure. O 1 s spectrum showed increases in the C=O and C–O components, suggesting that atmospheric oxygen reacted with the catalyst. This oxidation leaded to the deactivation of active center, thus the catalytic activity decreased. Based on these results, the stability in air of nitrogen-doped carbon materials must be taken into consideration when assessing applications as alternatives to platinum-based materials.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Yüfang Wu,Xiaolu Zhang,Yanchao Di,Yu Kang,Li Bai
The solubility of p-toluenesulfonamide and o-toluenesulfonamide in seven monosolvents of methanol, ethanol, n-propanol, isopropanol, n-butanol, acetonitrile, and ethyl acetate were measured by using the isothermal saturation method at temperatures ranging from 283.15 to 318.15 K under 101.3 kPa. The mole fraction solubility of p-toluenesulfonamide and o-toluenesulfonamide in those selected monosolvents increased with the increase in temperature. The maximum mole fraction solubility of o-toluenesulfonamide was observed in ethyl acetate (0.07748 at 318.15 K), followed by that in acetonitrile (0.07368 at 318.15K), methanol (0.05790 at 318.15 K), ethanol (0.04564 at 318.15 K), n-propanol (0.04271 at 318.15 K), isopropanol (0.04142 at 318.15 K), and n-butanol (0.03879 at 318.15 K). For p-toluenesulfonamide + solvents systems, the maximum mole fraction solubility was observed in acetonitrile (0.1588 at 318.15 K), followed by that in ethyl acetate (0.1329 at 318.15K), methanol (0.1043 at 318.15 K), ethanol (0.09142 at 318.15 K), n-propanol (0.06888 at 318.15 K), isopropanol (0.05092 at 318.15 K) and n-butanol (0.05645 at 318.15 K). The measured solubility data were correlated and calculated by using the modified Apelblat equation, Buchowski–Ksiazaczak λh equation, Wilson model, and NRTL model. The largest values of relative average deviations (RAD) and the root-mean-square deviations (RMSD) between the experimental and calculated solubility were 0.87 × 10–2 and 8.46 × 10–4, respectively. On the basis of the obtained solubility, the standard enthalpy of solution (ΔHsolo), the standard Gibbs energy (ΔGsolo) of solution, and the standard entropy of solution (ΔSsolo) of p-toluenesulfonamide and o-toluenesulfonamide dissolved in monosolvents were calculated. The results show that the dissolution of p-toluenesulfonamide and o-toluenesulfonamide in these monosolvents is a spontaneous process. The correlation and curve fitting results indicated good correlation of the experimental solubility data of p-toluenesulfonamide and o-toluenesulfonamide with the modified Apelblat model. Therefore, the experimental solubility and correlation equations established in this study can be useful in the crystallization, purification in laboratories, and related industries.
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CHEMOSPHERE
·
2016
·
IF 3.698
Yanfeng Wang,Xueqin Zhang,Huajun Feng,Yuxiang Liang,Dongsheng Shen,Yuyang Long,Yuyang Zhou,Qizhou Dai
To verify the potentially synthetic anodic and cathodic biocatalysis mechanism in bioelectrocatalysis systems (BECSs), a single-chamber thermophilic bioelectrocatalysis system (R3) was operated under strictly anaerobic conditions using the biocathode donated dual-chamber (R1) and bioanode donated dual-chamber (R2) BECSs as controls. Direct bioelectrocatalytic oxidation was found to be infeasible while bioelectrocatalytic reduction was the dominant process for p -Fluoronitrobenzene ( p -FNB) removal, with p -FNB removal of 0.188 mM d −1 in R1 and 0.182 mM d −1 in R3. Cyclic voltammetry experiments confirmed that defluorination in the BECSs was an oxidative metabolic process catalyzed by bioanodes following the reductive reaction, which explained the 0.034 mM d −1 defluorination in R3, but negligible defluorination in controls. Taken together, these results revealed a sequentially combined reduction and oxidation mechanism in the thermophilic BECS for p -FNB removal. Moreover, the enrichment of Betaproteobacteria and uniquely selected Bacilli in R3 were probably functional populations for p -FNB degradation.
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CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Xin Liu,Yuhong Zhang,Yushuai Jia,Junzhe Jiang,Yabin Wang,Xiangshu Chen,Tian Gui
We report the fabrication and photocatalytic property of a composite of C/CaFe 2 O 4 nanorods (NRs) in an effort to reveal the influence of carbon modification. It is demonstrated that the photocatalytic degradation activity is dependent on the mass ratio of C to CaFe 2 O 4 . The optimal carbon content is determined to be 58 wt% to yield a methylene blue (MB) degradation rate of 0.0058 min −1 , which is 4.8 times higher than that of the pristine CaFe 2 O 4 NRs. The decoration of carbon on the surface of CaFe 2 O 4 NRs improves its adsorption capacity of the MB dye, which is specifically adsorbed on the surface as a monolayer according to the adsorption isotherm analysis. The trapping experiments of the reactive species indicate that superoxide radicals ( • O 2 − ) are the main active species responsible for the removal of MB under visible-light irradiation. Overall, the unique feature of carbon coating enables the efficient separation and transfer of photogenerated electrons and holes, strengthens the adsorption capacity of MB, and improves the light harvesting capability, hence enhancing the overall photocatalytic degradation of MB.
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Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Ziao Zong,Xiangmin Meng,Xin Li,Caifeng Bi,Yuhua Fan
A novel Ni(II) coordination polymer, {[Ni(C9H9N2O3)2(H2O)2]·H2O}n(1)(C9H11N2O3, p-Aminohippuric acid, PAH), has been synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra, and thermal analysis. Single-crystal X-ray analysis reveals that each Ni(II) ion is six-coordinated by two coordinated water molecules, two carboxylate oxygen atoms, and two nitrogen atoms from PAH forming a octahedral geometry. The complex features a 2-nodal 2,4-connected network with unprecedented Schläfli symbol of (42)(4)2. In addition, the photocatalytic studies indicate that this complex is a good candidate for the photocatalytic degradation of rhodamine B.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Wenzong Xu,Baoling Xu,Aijiao Li,Xiaoling Wang,Guisong Wang
MgAl layered double hydroxides (LDHs) containing tripolyphosphate (P3O105–) (P-LDHs) were prepared by the anion exchange method; subsequently, aminopropyltriethoxysilane (APTS) was grafted onto the surface of P-LDHs to prepare S-MgAl LDHs (S-LDHs) through induced hydrolysis silylation. The dispersion, flame retardancy, and smoke suppression of N-LDHs (MgAl LDHs with nitrate in its interlayer), P-LDHs, and S-LDHs in polyurethane elastomer (PUE) were investigated. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that S-LDHs could disperse uniformly in PUE. The cone calorimetry and smoke density test indicated that S-LDHs performed best in flame retardancy and smoke suppression. By analyzing the char layer with Laser Raman spectroscopy (LRS), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), it could be concluded that, besides the catalytic charring effect of LDHs, the stable structure of −P(═O)–O–C– and −P(═O)–O–Si– could improve the thermal oxidative resistance and stabilize the char layer, resulting in better flame retardancy and smoke suppression.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 13
·4296-4302
·
IF 4.029
Tao Ji,Ze Cui,Wenlong Zhang,Yunjiu Cao,Yongfang Zhang,Shu-ang He,Mingdong Xu,Yangang Sun,Rujia Zou,Junqing Hu
Herein, we report a photocatalytic heterojunction device of rutile TiO2 nanorod arrays based on a p–n silicon junction (TiO2@PN) and its full absorption of ultraviolet and visible light for synergistic photodegradation. The fabricated TiO2@PN had excellent photocatalytic degradation of methyl orange (MO) under irradiation of a 300 W Xe lamp, and its pseudo-first-order rate constant k was 0.221 h−1, which was greatly higher than that for TiO2 nanorod arrays based on an n–p silicon junction (TiO2@NP, 0.078 h−1) and glass (TiO2@G, 0.032 h−1). The higher photocatalytic performance of TiO2@PN could be attributed to the fact that the photovoltage (PV) of the p–n junction promotes separation of the electron–hole pairs of the TiO2, and the holes are thus left within the TiO2 nanorods to produce a strong oxidant of hydroxyl radicals (˙OH). Moreover, this heterojunction device could be easily fabricated in a large size for easy recovery and recycling, which shows its promise in the solar-driven degradation of environmental pollution.
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