JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Qi Wang,Xiaodong Shi,Enqin Liu,John C. Crittenden,Xiangjuan Ma,Yi Zhang,Yanqing Cong
AgI sensitized BiOI-Bi 2 O 3 composite (AgI/BiOI-Bi 2 O 3 ) with multi-heterojunctions was prepared using simple etching-deposition process. Different characterization techniques were performed to investigate the structural, optical and electrical properties of the as-prepared photocatalysts. It was found that the ternary AgI/BiOI-Bi 2 O 3 composite exhibited: (1) improved photocurrent response, (2) smaller band gap, (3) greatly reduced charge transfer resistance and (4) negative shift of flat band potential, which finally led to easier generation and more efficient separation of photo-generated electron-hole pairs at the hetero-interfaces. Thus, for the reduction of Cr(VI), AgI/BiOI-Bi 2 O 3 exhibited excellent photocatalytic activity under visible light irradiation at near neutral pH. AgI/BiOI-Bi 2 O 3 was optimized when the initial molar ratio of KI to Bi 2 O 3 and AgNO 3 to Bi 2 O 3 was 1:1 and 10%, respectively. The estimated k Cr(VI) on optimized AgI/BiOI-Bi 2 O 3 was about 16 times that on pure Bi 2 O 3 . Good stability was also observed in cyclic runs, indicating that the current multi-heterostructured photocatalyst is highly desirable for the remediation of Cr(VI)-containing wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Yimeng Wang,Jie Wang
The pinewood was pyrolyzed in the first reactor at a heating rate of 10 °C min −1 from room temperature to 700 °C, and the vapor was allowed to be cracked through the second reactor in a temperature range of 450–750 °C without and with HZSM-5. Attempts were made to determine a wide spectrum of gaseous and liquid products, as well as the mass and element partitions to gas, water, bio-oil, coke and char. HZSM-5 showed a preferential deoxygenation effect via the facilitated decarbonylation and decarboxylation with the inhibited dehydration at 550–600 °C. This catalyst also displayed a high selectivity for the formations of aromatic hydrocarbons and olefins by the promoted hydrogen transfer to these products at 550–600 °C. The bio-oil produced with HZSM-5 at 500–600 °C had the yields of 14.5–16.8%, the high heat values of 39.1–42.4 MJ kg −1 , and the energy recoveries of 33–35% (all dry biomass basis).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Xiaohua Ren,Huanhuan Guo,Jinkui Feng,Pengchao Si,Lin Zhang,Lijie Ci
3D porous N-doped reduced graphene oxide (N-rGO) aerogels were synthesized by a hydrothermal reduction of graphene oxide (GO) with urea and following freeze-drying process. N-rGO aerogels have a high BET surface of 499.70 m 2 /g and a high N doping content (5.93–7.46 at%) including three kinds of N (graphitic, pyridinic and pyrrolic). Their high catalytic performance for phenol oxidation in aqueous solution was investigated by catalytic activation of persulfate (PS). We have demonstrated that N-rGO aerogels are promising metal-free catalysts for phenol removal. Kinetics studies indicate that phenol degradation follows first-order reaction kinetics with the reaction rate constant of 0.16799 min −1 for N-rGO-A(1:30). Interestingly, the comparison of direct catalytic oxidation with adsorption-catalytic oxidation experiments indicates that adsorption plays an important role in the catalytic oxidation of phenol by decreasing the phenol degradation time. Spin density and adsorption modeling demonstrates that graphitic N in N-rGO plays the most important role for the catalytic performance by inducing high positive charge densities to adjacent carbon atoms and facilitating phenol adsorption on these carbon sites. Furthermore, the activation mechanism of persulfate (PS) on N-rGO was first investigated by DFT method and PS can be activated to generate strongly oxidative radical (SO 4 · - ) by transferring electrons to N-rGO.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Haijian Luo,Chaolin Li,Xue Sun,Shuijing Chen,BinBin Ding,Liu Yang
Hydroxyl radicals (·OH) electrogenerated at anode surface can efficiently eliminate organic pollutants . However, these radicals are rapidly consumed and its action occurs only in the region where it is produced, thus only a portion of ·OH that are generated can be utilized and the degradation efficiency will eventually drop upon extended electrolysis. This paper proposed an alternative electro-oxidation process to avoid the mass transfer limitation and ·OH loss. This approach consists of two parts: (i) in situ electrogeneration of persulfate and (ii) subsequent UV activation. Efficient electro-generation of persulfate and degradation of phenol were obtained simultaneously when the anolyte contains sulfate ion and potassium sulfocyanide. Compared with ·OH mediated oxidation, persulfate mediated oxidation process has a small negative effect initially on the degradation rate of phenol, but then the persulfate effect became positive gradually. Phenol could be rapid eliminated once UV irradiation was added to activate the co-produced persulfate. A two-step mediated oxidation method was employed to further reduce consumed energy and sulfate dosage. Results show that the two-step method could completely eliminate the phenol in the wastewater which volume was ten times as much as that of the anolyte. An analysis of the whole reaction schemes governing this process was also presented. In summary, the persulfate mediated anodic oxidation process can be considered as a suitable and attractive method for maximizing the utilization of the electrochemical technology.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2016
·
IF 4.035
Xiyue Xiong,Haiqin He,Yan Shu,Yuxin Li,Zihui Yang,Yingzhuang Chen,Ming Ma,Bo Chen
A facile, flexible process was developed for the preparation of surface-glycosylated porous monolithic columns via aqueous two-phase graft copolymerization of polyethylene glycol diacrylate (PEGDA) and water-soluble dextran (dextran sulfate). The formation of poly(PEGDA) porous skeletons and surface glycosylation were achieved via a one-step process without pre-modification of the dextran. The synthesis conditions were thoroughly optimized. The optimal monolithic column exhibited a large dry state surface area (greater than 400 m 2 /g), and it was evaluated as a hydrophilic liquid chromatography (HILIC) stationary phase. A typical HILIC mechanism was observed at high organic solvent content (≥65% acetonitrile). In addition, the resulting monolithic column demonstrated the potential use in analysis of complex biological sample and enviroment water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 94
·91659-91668
·
IF 3.289
Yanli Mao,Minjia Meng,Li Yan,Fengquan Sun,Yongsheng Yan,Shijuan Liu
Herein, highly selective molecularly imprinted membranes (MIM) for methyl salicylate (MS) are synthesized with 4-vinylpyridine (4-VP), acrylamide (AM) or methacrylic acid (MAA) as the functional monomer based on the Al2O3 microporous ceramic membrane. Fast kinetic equilibrium for the rebinding of MS was found on all the imprinted membranes. Compared with AM-MIM and MAA-MIM, 4-VP-MIM presents a stronger adsorption capacity and higher permeation selectivity for MS due to the formation of ionic bonds between MS and 4-VP. SEM analysis shows that the surface morphology of the membranes is strongly influenced by the concentration of vinyltrimethoxysilane. Compared with 4-VP-MIM (1, 2 or 4), 4-VP-MIM3 possesses higher kinetic equilibrium adsorption, binding capacity and better selectivity for MS. It was found that the pseudo-second-order kinetic model is suited to describe the kinetic of 4-VP-MIM3, as determined by multiple regression analysis. The adsorption isotherm analysis exhibits that 4-VP-MIM3 has the maximum adsorption capacity for MS. Moreover, the selectivity experiment shows that the selectivity coefficients of 4-VP-MIM3 for MS relative to salicylic acid (SA) and phenol are 2.4185 and 2.2277, respectively, which are close to the predicted selectivity coefficient values.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2016
·Vol. 41
·期 4
·e13088
·
IF 0.894
Jin-Lin Li,Zong-Cai Tu,Xiao-Mei Sha,Lu Zhang,De-Rong Lin,Kai Zeng,Hui Wang,Juan-Juan Pang,Ping-Ping Tang
The effect of frying on fatty acid profile, free amino acids and volatile compounds of grass carp ( Ctenopharyngodon idellus ) fillets was investigated by comparing two frying time points (2 and 4 min). Although frying decreased overall fatty acid content with different degree of degradation between the two frying time points, the content of C18:2 n-6 and C18:3 n-3 was significantly increased ( P < 0.05). By contrast, the total free amino acids content increased from 53.36 nmol/kg in raw to 65.03 and 72.18 nmol/kg in samples fried for 2 and 4 min, respectively. It appeared that frying likely increased the content and number of volatiles since 13 and 4 novel volatiles were formed during 0–2 and 2–4 min of frying, respectively. It can be concluded that frying improves the taste and flavor of food, but decreases the nutritional value of grass carp fillets to some extent. Practical Applications Grass carp ( Ctenopharyngodon idellus ), one of the most important freshwater fish, is a valuable source of nutrition. It is usually treated by one or more various cooking processes before consumption, which gives rise to major changes in composition. Frying is one of the most common methods for processing fish to improve its nutrition, flavor and taste. The purpose of this study was to investigate the effect of frying on fatty acid composition, free amino acids and volatiles in grass carp meat. The results of this study provide a better understanding of how frying influences the nutrition and taste of grass carp fillets, and how the overall volatile profile changes during frying. This information could provide scientific guidance for processing delicious, nutritional and healthy fish products, and promote the application of grass carp even freshwater fish in food industry.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2016
·Vol. 9
·期 19
·2759-2764
·
IF 7.116
Runyuan Ma,Liang Wang,Bingsen Zhang,Xianfeng Yi,Anmin Zheng,Feng Deng,Xuhua Yan,Shuxiang Pan,Xiao Wei,Kai-Xue Wang,Dang Sheng Su,Feng-Shou Xiao
Graphical Zirc-S maximus : A zirconium-doped anatase catalyst (S-Zr-TiO 2 ) is prepared. The catalyst features zirconium sites with Brønsted acidity uniformly distributed on the sub-10 nm anatase crystals. The S-Zr-TiO 2 catalyst exhibits high catalytic activity towards the degradation of phenol under visible-light illumination, owing to a synergistic effect of the Brønsted acidity and photoactivity. The preparation of photocatalysts with high activities under visible-light illumination is challenging. We report the rational design and construction of a zirconium-doped anatase catalyst (S-Zr-TiO 2 ) with Brønsted acidity and photoactivity as an efficient catalyst for the degradation of phenol under visible light. Electron microscopy images demonstrate that the zirconium sites are uniformly distributed on the sub-10 nm anatase crystals. UV-visible spectrometry indicates that the S-Zr-TiO 2 is a visible-light-responsive catalyst with narrower band gap than conventional anatase. Pyridine-adsorption infrared and acetone-adsorption 13 C NMR spectra confirm the presence of Brønsted acidic sites on the S-Zr-TiO 2 sample. Interestingly, the S-Zr-TiO 2 catalyst exhibits high catalytic activity in the degradation of phenol under visible-light illumination, owing to a synergistic effect of the Brønsted acidity and photoactivity. Importantly, the S-Zr-TiO 2 shows good recyclability.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2016
·
IF 4.035
Meng Li Liu,Bin Bin Chen,Ze Xi Liu,Cheng Zhi Huang
Though many methods of detecting 2,4,6-trinitrophenol (TNP) mainly have been developed recent years, quantification of TNP in environmental matrixes still faces up to great challenges because all the nitroaromatic explosives reveal highly similar chemical structure. In the present work, we have developed a selective and sensitive method for detection of TNP by amorphous photoluminescent carbon nanodots (CNDs), which are prepared through a simple hydrothermal route using spermine and m-phenylenediamine (MPD) as precursors. The as-prepared CNDs are found to show blue–green photoluminescence, excitation-wavelength independence, and excellent chemical and optical stability. Owing to the strong characteristic absorption of TNP at 356 nm ( ε =1.048×10 4 cm −1 M −1 ), which has a good spectral overlap with the excitation band of CNDs, the fluorescence intensity of CNDs at 490 nm is linearly quenched with the adding concentration of TNP in the range of 0.1–100 μM. The developing assay based on inner filter effect (IFE) mechanism for the detection of TNP is selective and convenient, showing that the as-prepared CNDs have applicable prospect in the concept of simplicity and specificity in analytical chemistry .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Youan Ji,Yucui Hou,Shuhang Ren,Congfei Yao,Weize Wu
Phase equilibria of the binary systems of high pressure CO 2 + deep eutectic solvents (DESs) formed by quaternary ammonium salts (QASs, including 2-hydroxy- N , N , N -trimethyl-ethanaminium chloride, ChCl; N , N , N -trimethyl-methanaminium chloride, TMAC; and N , N , N -triethyl-ethanaminium chloride, TEAC) and phenol were measured at temperatures from 313.15 K to 333.15 K, pressures from 1.71 MPa to 13.3 MPa and mole ratios of phenol to QAS from 2.00 to 4.00. It has been found that two-phase equilibrium exists at all the studied conditions. The solubility of phenol in the CO 2 phase and the solubility of CO 2 in the DES phase at different pressures, temperatures, mole ratios of phenol to QAS have been obtained. Both the solubility of phenol in the CO 2 phase and the solubility of CO 2 in the DES phase formed by ChCl and phenol shows the largest, while those in the DES phase formed by TEAC and phenol shows the smallest. This work provides phase equilibrium data for phenol extraction and QAS regeneration.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 76
·48120-48126
·
IF 3.108
Danhua Xie,Donghong You,Shaoming Ying,Binglei Song,Jinnian Tian
Exploration of novel wormlike micelle systems is important for both the theory and applications of surfactant self-assembly. A new anionic surfactant, sodium 2-phenoxyhexadecanoate (sodium Ph-C16), was synthesized in this work. This surfactant can self-assemble in solution to form wormlike micelles with the help of a bolaform salt, ethane-1,2-bis(trimethyl ammonium bromide) (N-2-N bromide), by removing inorganic salts. The resultant aqueous system was investigated using rheological measurements, freeze-fractured-TEM and 2D NOESY 1H NMR experiments. A supramolecular gemini-like structure constructed from electrostatic interactions was a prerequisite for the wormlike micelle formation. The zero shear viscosity (η0) of the system had a very strong dependence on the surfactant concentration with a scaling exponent of 16.8 in the semi-dilute region, which is attributed to the extremely strong electrostatic attraction between the surface-active anions and bolaform cations. These results are beneficial for understanding anionic wormlike micelles in the absence of inorganic salts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 48
·25266-25275
·
IF 8.867
Zhigao Zhu,Lingling Zhong,Zhiqiang Zhang,Huarui Li,Wenxin Shi,Fuyi Cui,Wei Wang
Herein, flexible and hierarchical porous catalytic carbon nanofibrous membranes (MnO/Co@SiO2-CNFMs) driven by gravity were prepared using a co-electrospinning technique and self-reduced pyrolysis. Benefiting from the active metals and precursor carrier design, the composite active MnO/Co crystals can be directly produced without any reducing gases and easily migrate to the carbon nanofiber surface during the carbonization process. Meanwhile, the silica nanoparticles (SiO2 NPs) doped in the carbon nanofibers (CNFs) can maintain the carbon nanofiber structure without obvious shrinkage as well as transmit and scatter the outer stress, which endowed the membrane with robust flexibility and mechanical strength. The as-prepared MnO/Co@SiO2-CNFMs exhibited a superhydrophilic surface with a water contact angle of 0°, fast water flux of 752 ± 28 L m−2 h−1, and prominent catalytic performance with a high degradation efficiency over 99.5% toward methylene blue (MeB). Furthermore, four typical refractory pollutants (phenol, bisphenol-S, chlorophenol and sulfamethoxazole) can also be efficiently degraded by the gravity driven MnO/Co@SiO2-CNFMs/PMS system. This study is meaningful for the development of novel catalytic membranes with high efficiency and low energy consumption for wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）