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Textile effluents are major industrial polluters. The present paper aims to investigate and develop low cost adsorption methods for color removal wastewater using waste materials raw (RP) and activated carbon (ACP) from plane tree yellow leaves as adsorbent. The method was applied for the removal of direct red 81 while the influence of various factors such as adsorbate concentration and pH were studied...
The walnut shell, an agricultural waste, has been activated and used as an adsorbent for the adsorption of Direct and Reactive dyes from aqueous solution. Using a batch adsorption technique with respect to initial concentration and temperature the effects of various experimental parameters have been investigated. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich...
Methyl tert-butyl ether (MTBE) is widely used gasoline oxygenate which has been recognized as a hazardous material with high risk of carcinogenesis by EPA ad RCRA. MTBE can contaminate groundwater and soil through leaking from oil products tanks in fuel farms or gas stations. Porous soils can be used to adsorb contaminants such as MTBE. The main objective of this research is to evaluate the effectiveness...
It has been established that a long DNA molecule (> 20-30 kilo base-pairs) exhibits a conformational transition from a coiled state to a highly folded state under the presence of condensing agents such as polyamines. We have investigated these changes in conformation of long DNA molecules at a single-molecule level by directly observing conformation of individual DNA molecules in the bulk aqueous...
One-dimensional models of column liquid chromatography are today widely applied due to some obvious advantages. These models are easy to set up, they can be computed very fast, and they can often predict experimental results reasonably well. However, one-dimensional chromatography models also have some serious disadvantages, mainly because the applied homogeneity assumptions neglect important information...
Batch experiments were conducted to make a comparison in bromate removal between the silver-supported activated carbon (silver-AC) and virgin grander activated carbon(GAC). The probable mechanism of the better behavior of silver-AC was discussed. The effect of initial bromate concentration, pH and co-exist anions were also investigated in the study. Results showed that the removal efficiency of bromate...
A novel nano Fe3O4-Au modified amperometric immunosensor for rapid separation-free determination of human immunodeficiency virus (HIV) p24 antigen in acquired immunodeficiency syndrome (AEDs) patients' serum is proposed. Firstly, one novel sebacato-bridged Cu(II) phen complex Cu(phen)L2 (referred to as CuL, H2L=sebacic acid; phen=1,10phenanthroline) was absorbed on the surface of glassy carbon electrode...
Silicon nanowhisker (NW) growth was investigated by Monte Carlo simulation. Dependence of NW growth rate on radius R was obtained. Growth rate was found to be proportional to 1/R2 for diffusion growth mode and radius independent for adsorption mode.
Pre-reservoirs are small reservoirs having an average theoretical water retention time of a few days. They are situated immediately above the larger main reservoir or lake, whose nutrient loading it is their purpose to reduce. Rare earth sorbents were put into pre-dams to purify pollutants in water. A theoretical deduction showed that low-concentration phosphate adsorption process accorded with a...
A new polymer, oxidative Poly-Si-Fe (PSF) coagulant was prepared by an oxidization and copolymerization method. The influence of the oxidization of PSF on the adsorption of humid acid (HA) was explored, in comparison with that of polyferric aluminum (PFA). The results show that PSF changes the molecular structure of HA, leading to the improvement of adsorption of HA.
The modified nanometer-sized TiO2 as a solid sorbent was prepared by using impregnation method, and characterized by using SEM. The adsorption properties of the sorbent to Co(II) in static system, main factors affecting the adsorption and desorption, adsorption isotherms and influence of coexisting ions on the determination of Co(II) were investigated by FAAS, and regeneration experiments were carried...
Adsorption of p-chloronitrobenzene(pCNB) onto mesoporous molecular sieves (HMS) from aqueous solution has been investigated systematically using batch experiments in this study. Results indicate that p-chloronitrobenzene(pCNB) adsorption is initially rapid and the adsorption process reaches a steady state after 1 minute. The adsorption isotherms are well described by the Langmuir and the Freundlich...
Adsorption and separation of the binary mixture of CO2 and CH4 in erionite, mordenite and clinoptilolite are studied through a computer simulation technology-molecular simulation, and the simulation results showed a good agreement with the experimental data. The mechanism for the process was discussed and some conclusions for the process design were made.
Compared with the effect of total phosphorus removal by modified peat and ammonium nitrogen removal by modified zeolite respectively, ammonium nitrogen and total phosphorus removal by modified peat associated with modified zeolite from micro-polluted scenic-water were studied in this paper. The surface structures of natural material, modified material and the modified material after adsorption saturated...
The biosorption of Pb(II) ions on dried wasted beer yeast was investigated with respect to the adsorption conditions. The results of this study indicated that different variables, such as contact time, adsorbent dose, solution pH and initial heavy metal ions concentration influenced the adsorptive quantity. The best adsorption parameters and quantitative analysis of Pb2+ by dried waste beer yeast...
Polyurethanes with pedant quaternary ammonium salts (QAS) have been shown potent antimicrobial properties against gram-positive bacteria but less sensitive to gram-negative ones. Besides, due to using a large amount of QAS chain extenders, Polyurethanes with pedant QAS have been proven to be high water adsorption and even water soluble. In order to solve the two problems mentioned above, Novel polyurethanes...
The coagulation experiment, with Kaolin and humic acids (nature organics) as objects, aluminum chloride (PAC) as coagulant and hydrated MnO2 as coagulant aid, were accomplished under different conditions. In the experiment, the particle size distribution, turbidity and streaming current (SCD) in water were detected by on-line detector. Then the variation rules of particle size distribution and SCD...
Adsorption experiments of vapor-phase elemental mercury (Hg0) were carried out by using two types of chemically modified CTS/SiO2 sorbents in a laboratory-scale fixed-bed reactor. The characterizations of the sorbents were analyzed using the methods of nitrogen (N2) adsorption/desorption, field-scanning electron microscope (FSEM), Fourier transform infra-red spectroscopy (FTIR) and X-ray diffraction...
Mercury in power plant emission is present mainly in the vapor form and is not captured effectively by existing particulate removal systems. The characteristics of mercury sorption by Ca-based sorbents were experimentally measured. Experiments were carried out in a bench-scale fixed-bed mercury sorption facility with mercury permeation tube embedded in an isothermal water bath and simulated flue gas...
By combining SERS experiments with DFT calculations, the orientation of methylene blue (MB+) absorbed on the silver colloid at different concentrations are discussed. The results indicate MB+ adopts a parallel fashion at low concentration while a perpendicular one at high concentration.
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