SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Hao Ling,Sen Liu,Hongxia Gao,Zhiwu Liang
In order to study the effect of heat-stable salts (HSSs) on the CO 2 absorption performance of amine solution, the CO 2 absorption/desorption rates and cyclic CO 2 capacity of 30 wt% (monoethanolamine) MEA solutions in the presence of various acidic degradation products were comprehensively investigated systematically by an improved rate-based screening method. In addition, the initial pH values and CO 2 equilibrium solubility were also evaluated. These acidic degradation products considered were formic acid , acetic acid, propionic acid , butyric acid , glycolic acid, oxalic acid , lactic acid, malonic acid and bicine. The experimental results indicated that the carboxylic acids with different chemical structures can reduce the initial pH values, equilibrium solubility of CO 2 , absorption rate and cyclic CO 2 solubility, but promote the CO 2 desorption rate of aqueous MEA solution. Furthermore, a countermeasure was proposed to maintain absorption performance and reduce the energy requirement of solvent regeneration for an MEA amine-treating unit. The obtained results can provide a guidance for developing corresponding countermeasure for heat-stable salts control and removal in the CO 2 absorption-stripping process using amine solutions.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2018
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IF 2.831
Mengzhe Guo,Dantong Liu,Qian Sha,Houfa Geng,Jun Liang,Daoquan Tang
The epigenetic modification of DNA or RNA may have relationship with the development of diabetic nephropathy (DN). We designed to develop a liquid chromatography mass spectrometry (LC–MS) coupled with mobile phase additive sensitization method for the analysis of the dissociative epigenetic modified nucleosides in serum of patients from different periods of DN with the health comparison. Serum samples were collected from 43 healthy volunteers and 156 patients, which divided into four groups. A succinic acid enhanced LC–MS/MS strategy was developed for the quantitative analysis of seven nucleosides in serum samples. The signal intensity of seven nucleosides increased three to seven times, respectively. A series of statistical analysis were carried out to demonstrate the dynamic changes of modified nucleosides in four groups. This method showed good specific, accuracy, and stability. The results were calibrated and presented through the formation of m 6 A/C, I/C, 5-mdC/C, 5-mC/C, pseU/U to eliminate the individual and age differences. The m 6 A/C, I/C, and pseU/U were found having the dynamic changes in four groups ( p < 0.05). And these five modified nucleosides can also used as one parameter to distinguish these four groups by ROC and LDA analysis. Additionally, they were found to be connected with several clinical biochemical indexes through multiple linear regression analysis. Our LC–MS/MS method assay successfully quantifies the modified nucleosides in serum. And three modified nucleosides can act as the potential biomarkers to describe the development of DN and help to evaluate the diagnosis, treatment, and prognosis of DN in clinical.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
ZengHui Dai,ZeWen Yang,ZhiWei Chen,ZhongXiang Zhao,YongJian Lou,YanYan Zhang,TianXing Liu,FeiYa Fu,YaQin Fu,XiangDong Liu
In this study, a fully biobased composite reinforced by cotton fabrics was successfully fabricated by copolymerizing a bioderived unsaturated polyester (PEOI) with a green diluent, dimethyl itaconate (DI). The PEOI prepolymer was synthesized from itaconic acid (IA), oxalic acid (OA), and ethylene glycol (EG) via a simple polycondensation process and was characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and viscosity measurements. Subsequently, the prepolymer was dissolved in DI to prepare a polymerizable unsaturated polyester resin (UPE) with low viscosity, excellent reactivity for free radical polymerization, and good compatibility with cotton fibers. After being reinforced by cotton fabrics, the resulting composites showed satisfactory material performance, including a strong tensile strength at break of approximately 34 MPa, a glass transition temperature (Tg) of approximately 108 °C, and thermal decomposition temperatures (Td5%) ranging from 224 to 276 °C. These green composites derived from renewable resources are hopeful candidates for replacing petroleum-based UPE resins, and the family of IA derivatives may play promising roles in fabricating fully biobased composites.
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Journal of Materials Chemistry C
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2018
·Vol. 7
·期 2
·247-255
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IF 5.976
Chunyan Jiang,Mikhail G. Brik,Alok M. Srivastava,Lihua Li,Mingying Peng
Mn4+ doped fluoride phosphors have attracted tremendous attention in the solid-state lighting field due to the outstanding feature of efficient narrow band red emission. However, poor resistance against moisture-induced luminescence quenching is a recognized obstacle for realizing their wider commercial use. Herein, we design and fabricate a highly stable red phosphor based on previously unnoticed Rb2SnF6:Mn4+, which, estimated by the single crystal X-ray diffraction data, crystallizes in the trigonal space group Pm1 with the lattice parameters a = b = 6.0323(12) Å, c = 4.7880(8) Å, and V = 150.89(7) Å3. The Rb2SnF6:Mn4+ as expected exhibits highly efficient red emission upon excitation by UV and blue light. Significantly, the poor water resistance is conquered by constructing a protective deactivated layer with surface reduction of Mn4+. A treatment solution with appropriate reducing ability is emphasized to obtain Rb2SnF6:Mn4+ with simultaneous high brightness and water resistance. The results show that the low concentration of H2C2O4 solution treated Rb2SnF6:Mn4+ preserves a bright red-emitting color analogous to its initial color and >95% of its initial emission intensity when immersing in water at room temperature (RT) and in boiling water for 3 h. Lastly, by employing H2C2O4 treated Rb2SnF6:Mn4+ as a red phosphor, a high quality WLED with a CRI of 90, CCT of 3936 K and luminous efficacy of 106.24 lm W−1 is fabricated. This work not only experimentally fabricates a new efficient and stable Rb2SnF6:Mn4+ phosphor that can be used for high performance warm WLEDs but also provides a deep insight into how to well address moisture-induced Mn4+ luminescence quenching through appropriate reduction of Mn4+, opening up new opportunities for future solid-state lighting purposes.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2018
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IF 3.974
Di Guo,Amjad Ali,Chunyan Ren,Juan Du,Ronghua Li,Altaf Hussain Lahori,Ran Xiao,Ziyang Zhang,Zengqiang Zhang
Phytoremediation of contaminated soil is an in-situ reclamation technique for removal of potentially toxic metals through hyperaccumulator plants. Potherb mustard ( Brassica juncea, Coss. ) is less explored for its assisted phytoextraction potential to restore and accelerate potentially toxic metals removal from smelter-contaminated soil. In this study, different levels of ethylene diamine tetraacetic acid (EDTA) alone and combined with citric acid (CA) and oxalic acid (OA) were applied in a greenhouse pot experiment. Chelates added on 25th d and 25/35th d after sowing, enhanced cadmium (Cd) and zinc (Zn) bioavailability in soil due to complexation. As a result, Cd and Zn in shoot and root were significantly amplified by 1.7, 2.15 and 1.93, 2.7 folds than control, respectively. Shoot and root dry weight significantly reduced and ranged between 4.13–9.91 and 0.21–0.77 g pot −1 , respectively. The toxicity induced by potentially toxic metals in plant imposed a series of biological responses. Plant antioxidants like Phenylalanine ammomialyase (PAL), polyphenol oxidase (PPO) Catalase (CAT) content increased, except the peroxidase (POD) with the addition of chelating agents . Besides, biological concentration factor (BCF) of Cd and Zn, translocation factor (TF) of Cd were notably elevated (>1.0), while TF of Zn was reduced. Pearson correlation analysis showed a positive relation between DTPA-extractable and shoot concentration of Cd and Zn, whereas it showed negative correlation with plant dry weight. In general, chelate-assisted phytoremediation of smelter contaminated soil proved effective in this study, and followed the order: EDTA > EDTA + CA ≈ EDTA + OA > CK.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Yaqian Dan,Chengquan Zhong,Huanwen Zhu,Jun Wang
For surface-enhanced Raman spectroscopy (SERS) substrates, complexity of the fabrication process, sensitivity and stability are factors that need to be considered. We report a simple and novel method for preparing an effective substrate that greatly enhances SERS signals. The SERS substrate is fabricated by selectively electroless deposition of Ag nanoparticles in the highly ordered porous anodized aluminum oxide (AAO) template and then etching it to form Ag nanorod bundles structure, so that the Raman enhancement occurs in the gap between the nanorods and the top of the nanorod bundle, which is verified by finite element analysis . A peculiarity of this method is that this is the first time to synthesize Ag nanorod arrays structure by using it. The results indicated that this prepared substrate has special micro-nano structure and when rhodamine 6 G is selected as the detection reagent, the detection limit is as low as 10 −16 M with excellent recyclability. This outstanding array structure has a promising practical application in SERS field.
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高影响因子
Chemistry-An Asian Journal
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2015
·Vol. 10
·期 5
·1177-1183
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IF 4.587
Shuai Zhao,Haining Wang,Lanxia Xin,Jian Cui,Yehai Yan
Graphical Easy as 2, 3, 4 : 2-(3,4-Dihydroxyphenyl) pyrrolidine grafted graphene was developed as a competent platform for covalent functionalization of graphene, from which four typical but not exclusive graphene-derived materials of magnetic graphene-FeCl 3 complex, phenolic-, epoxide-, and methacryloyl-functionalized graphenes were successfully prepared. Covalent functionalization has proven an effective solution for graphene to realize its revolutionary potential in real applications, whereas the platform strategy (a reactive graphene-based material acting as the platform to undergo post-reactions for generation of various graphene-derived materials) is an attractive option to execute efficiently such a task. This contribution demonstrates that 2-(3,4-dihydroxyphenyl) pyrrolidine (DHPP) grafted graphene, G-OH, is a competent platform. Four typical but not exclusive graphene-derived materials have been prepared from G-OH by using the chemical virtue of each DHPP unit having three categories totaling six reactive sites. The controlled feature of 1,3-dipolar cycloaddition for the synthesis of G-OH ensures that the electronic structure and properties of pristine graphene are succeeded largely by G-OH and thus its derivatives. A promising alternative to graphene oxide, which has been widely used as a platform to prepare the graphene-derived materials but suffers from some intrinsic disadvantages, is thus developed.
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CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Xiaori Fu,Xiaogang Gu,Shuguang Lu,Minhui Xu,Zhouwei Miao,Xiang Zhang,Yacong Zhang,Yunfei Xue,Zhaofu Qiu,Qian Sui
In this study, the application of sodium percarbonate (SPC) catalyzed by various chelated-Fe(II) to stimulate the degradation of benzene in groundwater remediation was investigated. Effective oxidation of benzene was achieved in CIT/SPC/Fe(II) and OA/SPC/Fe(II) systems. The reaction mechanism for benzene degradation in CIT/SPC/Fe(II) and OA/SPC/Fe(II) systems was elucidated by free radical probe compound tests, free radical scavenger tests and electron paramagnetic resonance (EPR) analysis. And hydroxyl radical (HO ) and superoxide anion radical ( O 2 - ) were confirmed as the predominant species responsible for benzene degradation. Besides, the effects of various factors, such as the solution characteristics including the presence of anions (Cl − , HCO 3 − , SO 4 2− and NO 3 − ), natural organic materials (NOM), and the initial solution pH on benzene degradation were also evaluated. The influences caused by SO 4 2− , NO 3 − , Cl − and NOM were negligible, but HCO 3 − anion had a slightly inhibitive effect in low concentration (1 mM) and an apparently inhibitive effect in high concentration (10–100 mM). However, the additions of CIT and OA eliminated the adverse influence of HCO 3 − and ensured a high benzene degradation efficiency at wider pH range. Finally, results obtained in actual groundwater test strongly demonstrated that Fe(II)-CIT and Fe(II)-OA catalyzed SPC systems are applicable for the remediation of benzene-contaminated groundwater in practice.
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CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Wenhai Chu,Xin Li,Tom Bond,Naiyun Gao,Daqiang Yin
Low-molecular weight organic acids (LMWOAs) are widespread in nature, and many are recalcitrant during conventional drinking water treatment, due to their LMW and hydrophilic character. This study assessed the formation of a range of disinfection by-products (DBPs) from the chloramination of seven non-nitrogenous LMWOA precursors, with an emphasis on the contribution of N-chloramine incorporation to haloacetamide (HAcAm) formation. The other DBPs comprised chlorinated halomethanes, haloacetonitriles and haloacetic acids. Citric acid generated higher yields of trichloromethane and two chloroacetic acids than the other LMWOAs. Further, the unsaturated acids (fumaric acid and itaconic acid) formed more chloroacetic acids than saturated acids (oxalic acid, succinic acid, adipic acid). Importantly, non-nitrogenous LMWOAs formed three nitrogenous DBPs (dichloroacetamide, trichloroacetamide, and small amounts of dichloroacetonitrile) during chloramination, firstly indicating the monochloramine can supply the nitrogen in nitrogenous DBPs, and the formation of haloacetamides at least in part is independent of the hydrolysis of haloacetonitriles. To the authors’ knowledge, this is the first time formation of halogenated nitrogenous DBPs (N-DBPs) has been reported from chloramination of non-nitrogenous LMWOA precursors. This indicates that concentrations of dissolved organic nitrogen compounds in drinking water are not a reliable surrogate for formation of N-DBPs during chloramination. Bromine incorporation factor increased with increasing bromide during chloramination of citric acid, and bromine was easier to incorporate into di-HAcAms than mono- and tri-HAcAms during chloramination.
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JOURNAL OF HAZARDOUS MATERIALS
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2015
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IF 4.529
Bo Yang,Chaojin Jiang,Gang Yu,Qiongfang Zhuo,Shubo Deng,Jinhua Wu,Hong Zhang
The novel F-doped Ti/SnO 2 electrode prepared by SnF 4 as the single-source precursor was used for electrochemical degradation of aqueous perfluorooctanoic acid (PFOA). Higher oxidation reactivity and significantly longer service life were achieved for Ti/SnO 2 –F electrode than Ti/SnO 2 – X ( X = Cl, Br, I, or Sb) electrode, which could decomposed over 99% of PFOA (50 mL of 100 mg L −1 ) within 30-min electrolysis. The property of Ti/SnO 2 –F electrode and its electrooxidation mechanism were investigated by XRD, SEM–EDX, EIS, LSV, and interfacial resistance measurements. We propose that the similar ionic radii of F and O as well as strong electronegativity of F caused its electrochemical stability with high oxygen evolution potential (OEP) and smooth surface to generate weakly adsorbed OH. The preparation conditions of electrode were also optimized including F doping amount, calcination temperature, and dip coating times, which revealed the formation process of electrode. Additionally, the major mineralization product, F − , and low concentration of shorter chain perfluorocarboxylic acids (PFCAs) were detected in solution. So the reaction pathway of PFOA electrooxidation was proposed by intermediate analysis. These results demonstrate that Ti/SnO 2 –F electrode is promising for highly efficient treatment of PFOA in wastewater.
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高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2015
·Vol. 39
·期 1
·97-101
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IF 2.442
Dajie Zhang,Binzhe Sun,Lian Duan,Yufang Tao,Aihua Xu,Xiaoxia Li
The production of chemicals from lignin by green and sustainable technologies is a promising alternative route to replace fossil fuels. Photooxidation of guaiacol, a model of lignin, to value-added carboxylic acids with microwave discharge electrodeless lamps as light source was investigated in the presence of hydrogen peroxide (H 2 O 2 ). The coupled UV-vis/microwave irradiation led to a more effective degradation of guaiacol than with conventional photocatalysis. Hydroxyl radicals as active species, confirmed by electron spin resonance spin-trapping, were generated and participated in the oxidation. The effect of different operating conditions such as reaction time, guaiacol concentration, solution pH, as well as oxidant concentration, was evaluated.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2015
·
IF 3.091
Yapeng He,Weimin Huang,Rongling Chen,Wenli Zhang,Haibo Lin
The main aim of the present study was to explore the potential of boron-doped diamond (BDD) film electrode on porous titanium (Ti) substrate to promote the electrochemical oxidation of organic pollutants. Porous Ti endowed the Ti/BDD film three-dimensional porous structure. The electrochemical effective surface area for porous Ti/BDD anode was 8.37 cm 2 /cm 2 , 3.2 times as much as that of two-dimensional flat Ti/BDD electrode. Furthermore, the generation ability and rate of hydroxyl radical ( OH) on porous BDD electrode were enhanced due to the porous structure of BDD film. The step currents on porous Ti/BDD were about 2 times of those on flat Ti/BDD electrode from chronoamperometry curves, porous Ti/BDD exhibited superior indirect electrochemical oxidation ability. The results of electrodegradation of several typical organic pollutants (oxalic acid, phenol, sodium dodecylbenzene sulfonate, xylenol orange) revealed that current efficiencies on porous Ti/BDD electrode were about 30% higher compared with flat BDD electrode, corroborating the enhanced of electrochemical oxidation as the introduction of porous Ti substrate. Moreover, the discrepancy between promotion of COD removal rate and enhancement of OH was discussed.
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