Showing papers by "Henan Normal University published in 2009"
TL;DR: Batch experiments suggest that the decolorization efficiency was enhanced with the increase of NZVI dosage and reaction temperature, but decreased with increasing initial dye concentration and initial solution pH, and studies indicated that existence of inorganic salt could inhibit thedecolorization of MO.
509 citations
TL;DR: In this article, aqueous two-phase extraction systems based on imidazolium ionic liquids have been used to extract proteins of bovine serum albumin, trypsin, cytochrome c and γ-globulins.
399 citations
TL;DR: The decolorization of OG by Fenton oxidation process followed the second-order reaction kinetics, and the apparent activation energy E, was detected to be 34.84 kJ mol(-1).
301 citations
TL;DR: The results indicated that the prepared dumbbell-shaped ZnO microcrystal photoc atalyst showed good photocatalytic activity and it could be considered as a promising photocatalyst for dyes wastewater treatment.
231 citations
TL;DR: In this article, a novel wheat straw-g-poly(acrylic acid) (WS/PAA) superabsorbent composite by graft polymerization with wheat straw powder and acrylic acid in aqueous solution was discussed and the effect of wheat straw on water absorbency was discussed.
177 citations
TL;DR: Ultrasound-assisted ionic liquid dispersive liquid-phase micro-extraction was developed for the determination of four aromatic amines and has been found to have excellent detection sensitivity with limits of detection.
175 citations
TL;DR: Concentrations of PAHs in water and SPMs in dry season were much higher than those in flooding season, and the ratios of phenanthrene/anthracene (Phe/Ant) and fluoranthene/pyrene (Flua/Pyr) reflected a pattern of pyrogenic input.
174 citations
TL;DR: Fixed point and coincidence results are presented for single-valued hybrid generalized φ-weak contractions T,S defined on complete metric spaces.
162 citations
TL;DR: Oxone/Co(2+) oxidation process could be considered as one of the most promising technologies for practical applicability to treat landfill leachate in large scale and combination of it with other technologies in future such as ultraviolet, ultrasound and biological methods is proposed.
154 citations
TL;DR: It was shown that wheat germination was reduced to 38.0% in the presence of 4.4 mmol/L [C4mim][BF4] compared with 100% germination for the control, and the root and shoot length of wheat seedlings decreased with increasing concentrations of this IL.
Abstract: Although many studies describe ionic liquids (ILs) as potentially greener solvents, few studies address their relationship with the environment. Recent researches suggest that some ILs have toxicity. 1-Butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4]) was reported to have the lowest toxicity among ILs. In this work, we studied the toxicity of this IL on wheat seedlings. It was shown that wheat germination was reduced to 38.0% in the presence of 4.4 mmol/L [C4mim][BF4] compared with 100% germination for the control. Similarly, the root and shoot length of wheat seedlings decreased with increasing concentrations of [C4mim][BF4]. The activity of amylase increased in shoots and roots, but it decreased significantly in germinating seeds when the [C4mim][BF4] concentration exceeded 1.8 mmol/L. Peroxidase (POD) activity and soluble protein content in shoots treated with [C4mim][BF4] changed similarly, but chlorophyll content tended to decrease with increasing concentration of [C4mim][BF4], except for at 1.8 mmol/L. Thus, [C4mim][BF4] at the concentration of 0.9 mmol/L or more was toxic to wheat seedlings. Some remedial measures are suggested to deal with IL pollution in the environment. © 2008 Wiley Periodicals, Inc. Environ Toxicol, 2009.
132 citations
TL;DR: In this article, the WO3-TiO2/AC (activated carbon) photocatalyst used in the experiment was prepared by the sol-gel-dipping-calcination method.
TL;DR: It is shown that the alkyl chain length of the cations and type of anion affect the ionic association constants and limiting molar conductivities of the ILs, and similar to the classical electrolytes, a linear relationship is observed between ln KA of theILs and the reciprocal of the dielectric constants of the molecular solvents.
Abstract: Considering the ionic nature of ionic liquids (ILs), ionic association is expected to be essential in solutions of ILs and to have an important influence on their applications. Although numerous studies have been reported for the ionic association behavior of ILs in solution, quantitative results are quite scarce. Herein, the conductivities of the ILs [Cnmim]Br (n=4, 6, 8, 10, 12), [C4mim][BF4], and [C4mim][PF6] in various molecular solvents (water, methanol, 1-propanol, 1-pentanol, acetonitrile, and acetone) are determined at 298.15 K as a function of IL concentration. The conductance data are analyzed by the Lee-Wheaton conductivity equation in terms of the ionic association constant (KA) and the limiting molar conductance (Lambda(m)(0)). Combined with the values for the Br- anion reported in the literature, the limiting molar conductivities and the transference numbers of the cations and [BF4]- and [PF6]- anions are calculated in the molecular solvents. It is shown that the alkyl chain length of the cations and type of anion affect the ionic association constants and limiting molar conductivities of the ILs. For a given anion (Br-), the Lambda(m)(0) values decrease with increasing alkyl chain length of the cations in all the molecular solvents, whereas the KA values of the ILs decrease in organic solvents but increase in water as the alkyl chain length of the cations increases. For the [C4mim]+ cation, the limiting molar conductivities of the ILs decrease in the order Br- > [BF4]- > [PF6]-, and their ionic association constants follow the order [BF4]- > [PF6]- > Br- in water, acetone, and acetonitrile. Furthermore, and similar to the classical electrolytes, a linear relationship is observed between ln KA of the ILs and the reciprocal of the dielectric constants of the molecular solvents. The ILs are solvated to a different extent by the molecular solvents, and ionic association is affected significantly by ionic solvation. This information is expected to be useful for the modulation of the IL conductance by the alkyl chain length of the cations, type of anion, and physical properties of the molecular solvents.
TL;DR: In this article, the authors examined the antioxidant responses of Daphnia magna following exposure to different concentrations of the ionic liquid (IL) 1-octyl-3methylimidazolium bromide and the 50% LC(50) concentrations of methylimidaze-drugs with different alkyl-chain lengths.
TL;DR: In this article, two microbial cultures with high decolorization efficiencies of reactive dyes were obtained and were proved to be dominant with fungi consortium in which 21 fungal strains were isolated and 8 of them showed significant decolorisation effect to reactive red M-3BE.
TL;DR: In this paper, a high-energy-density LiFePO4/C composite cathode material for a lithium-ion battery was synthesized using self-produced high-density FePO4 as a precursor, glucose as a C source, and Li2CO3 as a Li source, in a pipe furnace under an atmosphere of 5% H2−95% N2.
TL;DR: In this paper, the effect of initial pH, dosage of H 2 O 2, H O 2 /Fe 2+ and reaction temperature on the decolorization efficiency and kinetic of Direct Blue 15 (DB15) was investigated, the operating parameters were preferred by changing one factor at one time while the other parameters were kept constant.
TL;DR: In this article, the photocatalytic efficiency of Zr-doped TiO{sub 2} nanotubes was investigated with Rhodamine B as the model pollutant.
TL;DR: By employing this protocol, a series of novel pyrimidine nucleoside-thiazolidin-4-one hybrids were prepared and their preliminary antiparasitic activities were also studied and reported.
TL;DR: In this article, an exponential equation with empirical parameter A suggested initially by Seddon et al. was used to describe the dependence of viscosities on the mole fraction of molecular solutes, and the physical meaning of A based on a theoretical equation deduced from rate process theory.
TL;DR: Among the four soil enzymes, only alkaline phosphatase was sensitive to oxytetracycline exposure with 41.3% decline of the enzyme activity at 10mg/kg antibiotic and further decrease of 64.3%-80.8% when the dosage over 30 mg/kg.
Abstract: The microbial community composition in wheat rhizosphere was analyzed by detecting colony forming units (CFUs) in agar plates. The total CFUs in rhizosphere were 1.04 x 10(9)/g soil with 9.0 x 10(8)/g bacteria, 1.37 x 10(8)/g actinomyces and 3.6 x 10(6)/g fungi. The 10 dominant bacteria were isolated from wheat rhizosphere and were grouped into genus Bacillus according to their full length 16S rRNA gene sequences. Although belonging to the same genus, the isolated strains exhibited different sensitivities to oxytetracycline. When a series of the rhizosphere soil was exposed under various concentrations of oxytetracycline, the microbial community structure was highly affected with significant decline of CFUs of bacteria and actinomyces (22.2% and 31.7% at 10 mg/kg antibiotic, respectively). This inhibition was clearly enhanced with the increase exposure dosage of antibiotic and could not be eliminated during 30 d incubation. There was no obvious influence of this treatment on fungi population. Among the four soil enzymes (alkaline phosphatase, acidic phosphatase, dehydrogenase and urease), only alkaline phosphatase was sensitive to oxytetracycline exposure with 41.3% decline of the enzyme activity at 10 mg/kg antibiotic and further decrease of 64.3%-80.8% when the dosage over 30 mg/kg.
TL;DR: In this paper, the cross sections for e + e − annihilation into hadronic final states (R values) were measured with statistical errors that were smaller than 1%, and systematic errors that are about 3.5 %.
TL;DR: A novel robust control law is established to make the state of system stable and to improve the robustness and the stability of system and a new reaching law is introduced to reduce the chattering.
Abstract: This paper is concerned with the stabilization problem for a class of nonlinear systems. Using the global sliding mode control approach, a novel robust control law is established to make the state of system stable and to improve the robustness and the stability of system. A new reaching law is introduced to reduce the chattering. Finally, the method is applied to chaotic systems and an example of the chaotic system is given to illustrate the advantage of the proposed method.
TL;DR: A good linear relationship of the concentration of dopamine hydrochloride versus absorbance was observed, and a linear regression equation of A = 0.022 + 0.16921C (microg mL(-1)) was obtained.
Abstract: In the present work, we developed a simple, sensitive and inexpensive method to determine dopamine hydrochloride using potassium ferricyanide-Fe(III) by spectrophotometry. The results show that Fe(III) is deoxidized to Fe(II) by dopamine hydrochloride at pH 4.0, and then Fe(II) reacts with potassium ferricyanide to form a soluble prussian blue (KFe(III)[Fe(II)(CN)6]). The absorbance of this product was monitored over time using a spectrophotometer at an absorption maximum of 735 nm, and the amount of dopamine hydrochloride could be calculated based on the absorbance. A good linear relationship of the concentration of dopamine hydrochloride versus absorbance was observed, and a linear regression equation of A = 0.022 + 0.16921C (microg mL(-1)) was obtained. Moreover, the apparent molar absorption coefficient for the indirect determination of dopamine hydrochloride was 3.2 x 10(4) L mol(-1) cm(-1). This described method has been used to determine dopamine hydrochloride in pharmaceutical, banana, urine and serum samples with satisfactory results.
TL;DR: It is suggested that the higher photosynthetic activities, more effective uptake and utilization to phosphate, and low light requirements might play important roles in the occurrence and invasive behavior of C. raciborskii.
TL;DR: A new procedure was described to investigate the trapping power of TiO(2) nanotubes with cadmium and nickel in water samples as the model analytes and flame atomic absorption spectrometry for the analysis, and satisfactory results were obtained.
TL;DR: In this paper, strong and weak convergence for Mann iteration of multivalued nonexpansive mappings T in a Banach space is shown for the modified Mann iteration, which is independent of the convergence of the implicit anchor-like continuous path z t ∈ t u + ( 1 − t ) T z t.
Abstract: We show strong and weak convergence for Mann iteration of multivalued nonexpansive mappings T in a Banach space. Furthermore, we give a strong convergence of the modified Mann iteration which is independent of the convergence of the implicit anchor-like continuous path z t ∈ t u + ( 1 − t ) T z t .
TL;DR: A novel temperature controlled ionic liquid dispersive liquid phase microextraction method in combination with high performance liquid chromatography for the enrichment and determination of DDT and its metabolites is established.
TL;DR: In embryos exposed to [C8mim]Br, the duration of embryo dechorionation was prolonged in the early cleavage and neural plate, but not the early gastrula, stages of development compared with control embryos.
TL;DR: In this article, a simple copper promoting system was proposed to efficiently promote Glaser coupling reaction under ambient temperature, and the successful application of the CuI/NBS/DIPEA promoting system in sugar and amino acid-building blocks indicated the potential of this method in the construction of designed sugar and peptide biomolecules.
TL;DR: The binding of quercetin (QCT) to ovalbumin (OVA) in aqueous solution was investigated by molecular spectroscopy and modeling at pH 7.4 as mentioned in this paper.