The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Glutamate decarboxylase (GAD) is the key enzyme for the production of gamma-aminobutyric acid (GABA), a multifunctional agent which biosynthesis has attracted intense interest. Though immobilized GAD favors the preparation of GABA in several ways, its efficiency and enzyme activity recovery are damaged by the separation of purification and immobilization of enzyme. In order to simplified the process...
In this paper, the removal of aflatoxins B2 from water is studied and a new adsorbent Cu/PTMAB-MMT is prepared. The change of the microscopic structure of the absorbent before and after adsorption reaction is analyzed by TEM, XRD and EPR. The effect of temperature and PH on the adsorption are studied and also the best temperature and PH are determined.
A new process for reduction of waste sludge by ultrasound has been demonstrated. In former studies, ultrasound was mainly used for dehydration of waste sludge. Otherwise, it has been reported that ultrasound could efficiently provide a chance for excess sludge removal in reactor directly. Therefore, ultrasound was suggested to reduce waste sludge in SBR reactor in this paper. The results showed that...
A new composite coagulant was prepared by polyaluminum chloride (PAC) and and polydimethyldiallylammonium chloride (PDMDAAC). The chemical species distribution, structure and surface charge of the composite coagulant (PAC-PDMDAAC) were studied by Al-Ferron complexation timed spectrophotometry, TEM and zeta potential measurement, respectively. And the coagulation efficiency of PAC-PDMDAAC was studied...
Liposoluable tea polyphenols(LTP) were synthesized by chemically modifying tea polyphenols(TP) with stearyl chloride. FTIR analysis indicated that carbonyl and long carbon chain were introduced into the tea polyphenols. The optimal process parameters were given as follows: n(TP)/n(stearyl chloride)/n(Na2CO2) = 1/1.5/1.5, and the experimental conditions were controlled at 80°C for 4 h. The applications...
The synthesis of heteropoly compounds and preparation of the heteropoly acid zinc salt as photocatalyst, and their characterizations are studied by IR, SEM and BET. The result showed that the prepared compounds have Keggin structure, and remain the structure after salted, the HPA for degrading dye wastewater analog, photocatalytic decolorization rate methyl orange solution is investigated, The photocatalytic...
In this paper, some three and four complexes of holmium have been synthesized. Using agar dilution method, the bacteriostasis activity of the holmium complexes against Escherichia coli, Staphylococcus aureus, Bacillus subtilis are mensured and their minimal inhibitory concentration (MIC) to the growth of bacterium have been determined. The result shows that their complexes of holmium have bacteriostasis...
Through the choose of inorganic flocculants (Ferrous sulfate (FS)) and the organic polymer flocculant (PAM) of diatomite was modified, using modified diatomite to treat ammonia-nitrogen wastewater. The experiment indicated that adsorption process of modification of the type and dosage, diatomite consumption, pH, in the initial concentration of ammonia solution is the impact of ammonia adsorption of...
The germinating capacity of wheat was investigated in the presence of butyhted hydroxy toluene (BHT) with ultraviolet (UV) radiation. The influence of UV and BHT on the growth of wheat was evaluated by means of variability of chromosome of germinating root tip cell mitosis and activity of superoxide distamuse (SOD) of malt. The results show that the germinating capacity of wheat reaches 87% when the...
In order to improve the oil-displacement effect of microspheres, larger particles of cross-linked polymer were synthesized by inverse emulsion polymerization to match cores with biggish duct. Before hydration, particle sizes of microspheres are a few hundred nanometers, the particle sizes can increase by about 10 times after hydration, which shows that cross-link polymer microspheres have well expanding...
In this paper, the oil-produced water (PW) mixed with fresh water (FW) was treated before it was injected into reservoirs. The effects of the factors such as pH value, variety and quantity of oxidants and inorganic flocculants, quantity and molecular of organic flocculants, the order and time of the reagents to be added on the water quality including amount of scale buildup, iron content, oil content,...
According to the low yield of propylene existing in gas fractionation device due to higher C2 content in LPG, the factors affecting on LPG quality in the absorbing-stabilizing system were analyzed. Some technics such as optimization of operating condition and energy-efficient process were adopted to intensify the separation effect, offering the advice with lower C2 content (no more than 0.1%χ) in...
As the oil shale retorting process is unique, resulting wastewater contains large amounts of oil, sulfide, cyanide, volatile phenol, ammonia and other toxic substances, its high content of COD and refractory material and more. This paper attempts to establish a comprehensive titanium dioxide photocatalytic water treatment methods of oil shale, and shadow detail catalytic sewage treatment factors such...
The influence of four different cacuum pressure on drying process of RDX with relative moisture content 8% was investigated at 70°C. The results show that the greater the vacuum is, the shorter the drying cycle is and drying rate accelerates, but when vacuum is up to a certain extent, it is limited to increase the drying rate; critical moisture content and equilibrium moisture content don't generally...
Objective To study the prescription and preparation technology of Prunella ethanol extract dispersible tablets. Methods Take disintegration time as indexes, the prescription and preparation technology were optimized by an orthogonal design. The hardness, suspended uniformity, dissolution were investigated and preliminary stability were tested through accelerated test. Results The optimum prescription...
The stable adsorption complex is synthesized by Zn(II) and a inclusion complex of β-cyclodextrin resin and 8-hydroxyquinoline with epichlorohydrin as crosslinking agent. The adsorption complex was used as an adsorbent to study its adsorption performance on trace Zn(II) in water by atomic absorption spectrophotometry. The experiment researched adsorption and elution conditions and enrichment factor,...
The objective of this paper is to introduce the development and technical features of WX/U-desulfurization equipment which is an efficient integrated wet de-dusting and desulfurization facility. Effect of various operational parameters on the desulfurization efficiency of WX/U-desulfurization equipment was studied experimentally. And the experimental data was compared with that of a single venturi...
Fungicidal Bio-trickling filter can remove the gas volatile organic compounds by fungus, which is the latest air pollution control technique. Activated carbon and ceramic pellets were chosen to set up to the bio-trickling filters. To study the different packing, height degree, voltage drop and flow rate influence the effect of treatment “three benzene” waste gas on. Results: 1)activated carbon superior...
Dibutyl phthalate is one of major plasticizer, which has detrimental effects on human health. Extraction is an important method to treat high concentration dibutyl phthalate. In order to optimize the extraction condition of treatment high concentration dibutyl phthalate, this article firstly compared the efficiency of five different extraction agents including carbon tetrachloride, benzene, isooctanol,...
Three novel meso-coumarin-substituted porphyrins 3a, 3b and 3c have been synthesized via the reduction of the corresponding porphyrin-counmarin Schiff bases 2a, 2b and 2c, which were obtained by condensation of coumarin aldehydes with 5-(4-aminophenyl)-10, 15, 20-triphenylporphyrin in refluxing toluene. The three novel porphyrins were characterized by 1H-NMR, HR-ESI, UV-vis and fluorescence spectra...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.