adsorption of polyelectrolytes onto oppositely charged surfaces

... to 30 Fig Test for adsorption interference between Cd and Pb A Pb adsorption to bio®lms in the presence and absence of Cd B Cd adsorption in the presence and absence of Pb For adsorption from mixtures, ... with a total of eight variables (four values of Gmax and four values of Ki) i The data set consisted of adsorption data for the unextracted bio®lms plus bio®lms extracted with each of the three ... removed 14% of the Fe, 39% of the Al and 32% of the organic material (Table 2) Na2S2O4 removed 83 and 92% of the Fe and Mn, respectively, but also removed 83% of the Al Very little (3%) of the organic...

Ngày tải lên: 15/03/2014, 23:12

... to study the adsorption mechanism The effects of ionic strength on the adsorption of arsenic(III) and arsenic(V) onto the surfaces of ceria NPs were presented in Figure The amount of arsenic(III) ... Table The adsorption enthalpy of arsenic onto ceria NPs was 17.89 kJ mol−1, indicating that the adsorption process of arsenic onto ceria NPs was endothermic It was reported that the enthalpy of physisorption ... the adsorption of arsenic onto ceria NPs is a physisorption process The positive adsorption entropy indicated that the degrees of freedom increased at the solid-liquid interface during the adsorption...

Ngày tải lên: 21/06/2014, 17:20

... immobilized onto the surface of chitin, the intensity of dithizone bands is considerably low as compared to those of chitin The XRD also suggests that immobilization of dithizone onto the surface of chitin ... existence of more intense peaks, characteristic of dithizone in the IR spectra 3.3 Effect of pH on the Biosorption of Cd(II) Ions Preliminary study of the heavy metal ion adsorption capability of dithizone-immobilized ... pH of solution Figure 5: Effect of pH on the adsorption of Cd(II) ion by chitin and dithizoneimmobilized chitin Journal of Physical Science, Vol 19(1), 63–78, 2008 75 Figure shows that the adsorption...

Ngày tải lên: 07/08/2014, 14:20

Ngày tải lên: 13/11/2014, 10:13

... molecules and silicon surfaces Functionalization of Si surfaces with organic molecules depends on the detailed understanding of the reaction mechanisms of functional groups with Si surfaces Several ... on the Si surfaces 1.5 Objective and organization of this thesis The main purpose of this thesis is to investigate the binding of unsaturated halogenated organic molecules onto Si surfaces, as ... reaction mechanism of unsaturated halogenated organic molecules on Si(100)-2×1 and Si(111)-7×7 surfaces On the basis of fundamental understanding of silicon surface chemistry of halogenated organic...

Ngày tải lên: 14/09/2015, 08:43

... comparison for the adsorption of organic acids onto the carbon cloth can be made on the basis of the amount of adsorbate adsorbed per unit mass of carbon cloth, M, at the end of 90 adsorption calculated ... solutions having a range of pH onto high area activated carbon cloth by means of in situ UV spectroscopy The examination of the effect of ionization of these aromatic acids on their adsorption was also ... achieved lowering of initial × 10−4 M concentration of NO3 − and NO2 − by 22 and 10%, respectively, using the method of adsorption onto carbon cloth Adsorption and electrosorption of another noxious...

Ngày tải lên: 01/12/2016, 16:24

... unknown geometry of surface carbon-atom packing The θ and M values for the adsorption of benzoic acid onto 3.3 Adsorption isotherms of benzoic acid at different pH The equilibrium adsorption isotherms ... extents of adsorption (Fig 2, Table 2) Very small amounts of adsorption observed at these pH values may result from π –π dispersion interactions Conclusions Adsorption of benzoic acid onto high ... and (3) at 125 of adsorption are given in Table at different pH values The extent of adsorption of benzoic acid according to the θ and M values at 125 decreases in the pH order of 3.7 > 2.0 >...

Ngày tải lên: 01/12/2016, 16:24

... during adsorption Adsorption Kinetics Transport Mechanisms Removal of organic compounds by physical adsorption on porous adsorbents involves a number of steps, each of which can affect the rate of ... value of qe that can be achieved as Ce is increased The constant b is related to the energy of adsorption and increases as the strength of the adsorption bond increases The Langmuir equation often ... compounds The quantity of activated carbon or other adsorbent required to remove a certain amount of a compound of interest ADSORPTION OF ORGANIC COMPOUNDS 13.7 from a mixture of adsorbable compounds...

Ngày tải lên: 14/02/2014, 03:20

Ngày tải lên: 15/03/2014, 23:09

... Therefore, adsorption characteristics of metal–NTA complexes are different as compared with EDTA Studies of adsorption of Co–NTA onto gibbsite [112] and Pb–NTA onto TiO2 [113] showed that chelation of ... the adsorption of different heavy metals onto soil humic acid [5] 50% of the Cd or Zn is adsorbed between pH 4.8–4.9 In general, adsorption of heavy metals onto oxide and humic constituents of ... divergence of metal ad EDTA adsorption occurs Only very little difference occurs between adsorption of different divalent metal types–EDTA complexes onto the same surface [104–106] Studies of adsorption...

Ngày tải lên: 15/03/2014, 23:09

... thickness of the ONWs is of the order of several ångström, the observed LDOS is a convolution of the LDOS of the SiNWs and that of the adsorbed PQ aggregates Therefore, the contribution of the LDOS of ... after a significant amount of time for diffusion of THAP molecules is given, the adsorption remains non preferential Having established that no preferential adsorption of THAP on the SiNWs is observed, ... analysis of the Si2p core levels and valence band of the surface [1] To address the issue of whether or not any type of molecule will react exclusively with the SiNWs, we used two different types of...

Ngày tải lên: 16/03/2014, 15:35

... between the H3 and B2 sites The change of the adsorption site of Ag atom because of the pre -adsorption of H on Si(111)-7 may be due to the reconstruction of Si surface electronic structures induced ... the influences of H on the Ag adsorption at a Si(111)-7 surface, we first calculate the adsorption energies of Ag atom at the high coordination sites on the clear and 19H-Si(111)-7 surfaces, because ... the influences of H on the adsorption of metal on the Si(111)-7 surface using first-principles calculations H is the main surfactant during the heteroepitaxy of the metals on Si surfaces When H...

Ngày tải lên: 22/06/2014, 00:20

... Distributed Proofreading Team at http://www.pgdp.net (The original copy of this book was generously made available for scanning by the Department of Mathematics at the University of Glasgow.) Notes ... Lagrange, le premier, a montrộ que, par un contour xe, il passe des surfaces moins ộtendues que toutes les surfaces voisines Monge, en ộtudiant ôles surfaces dont les rayons de courbure sont toujours ... on obtient deux surfaces minimas, applicables lune sur lautre ; 4o que lon peut ộcrire lintộgrale des surfaces admettant pour ligne de courbure, asymptotique ou gộodộsique, un contour dộterminộ...

Ngày tải lên: 28/06/2014, 19:20

... 2Institute of Anatomy, Division of Histology, University of Bern, Bern, Switzerland Division Neonatology, Department of Paediatrics, Inselspital and University of Bern, Bern, Switzerland 4Department of ... methods to quantify exchange rates and affinities of proteins for nanoparticles Proceedings of the National Academy of Sciences of the United States of America 2007, 104:2050-2055 32 Lynch I, Dawson ... Thulin E, Radford SE, Dawson KA: Nucleation of protein fibrillation by nanoparticles Proceedings of the National Academy of Sciences of the United States of America 2007, 104:8691-8696 35 Owens DE,...

Ngày tải lên: 11/08/2014, 00:22

... presence of 0-5 % NaF ACTION OF SNAKE VENOMS ON SURFACE FILMS 439 (ii) Effect of 8urface concentration8 of lecithin The rate of attack of a lecithin film is considerably diminished as the number of ... 180 None of the venoms has any.effect on a unimolecular film of cholesterol or of protein, and they cause no hydrolysis of tripalmitin, triolein, cerebron or sphingomyelin The action of the venom ... varying amounts of protein in the solution and the possible adsorption of the venom on the glass vessel as well as at the surface of the film It must be remembered that the values of the venom concentration...

Ngày tải lên: 24/10/2014, 07:17

... direction of of placement formwork Poor form anchorage and inadequate bulkheads Excessive retardation of time of setting of concrete Excessive amplitude, non-uniform spacing Rate too high of immersion ... amount of reinforcing steel, and method of depositing the concrete The purpose of consolidation is to remove as much of this entrapped air as practical Vibration is the most common method of consolidation ... content, or both Also, the use of vibrators with too high of an amplitude or the lack of complete insertion of the vibrator head may result in an increased quantity of air-voids Air voids vary in...

Ngày tải lên: 24/10/2014, 22:00

... Mass of beam Length of beam Width of beam Height of beam Second moment of area of beam Young’s modulus (i: ice, a: aluminium) Height of section (i: ice, a: aluminium) Distance between midpoint of ... mechanics of the adhesion of ice to solid surfaces An early work in this field of study was done by Raraty and Tabor (1959) Here the measurement of adhesion strength of ice onto metal surfaces ... heat ratio of air interfacial tension Radius of bubble Density of water gravitational acceleration thermal diffusivity of gas speed of sound in water speed of sound in air shear viscosity of water...

Ngày tải lên: 08/09/2015, 18:19

... uptake of DMA 44 4.3.3 Effect of pH and background electrolyte on the uptake of MMA .47 4.3.4 Effect of pH and background electrolyte on the uptake of arsenate 49 4.3.5 Adsorption edges of ... between arsenic and mineral surfaces Among these interactions, adsorption of arsenic on the surface of minerals is one of the most important processes Adsorption of inorganic arsenic on aluminum ... proton-anion adsorption ratio is also related to the types of surface complexes 2.5.2 Proton-anion adsorption ratios Adsorption of arsenic on goethite is accompanied by adsorption of protons (Jain...

Ngày tải lên: 15/09/2015, 17:10

... LIST OF SYMBOLS μ = { j } = n  vector of the mean of the noise variables in un-coded metric, where n is the number of noise variables μˆ = {ˆ j } = an estimator of μ Σ = covariance matrix of ... planning of the combined array experiment with planning of the estimation of the means and covariances of the noise variables Within the framework of the procedure, we treat the problems of estimation ... the issues of specification of the levels of the noise variables, estimation of the mean and variance models, repeated sampling properties of the estimators, and optimal allocation of resource...

Ngày tải lên: 05/10/2015, 21:29