chromium vi ion from aqueous solutions using acid modified rice husk

... adsorption of Cr ions by only analyzing Cr (VI) concentration in aqueous solutions resulting in incorrect elucidation of Cr biosorption Cr (VI) was removed from aqueous solution systems by ‘anionic ... reduction of Cr (VI) ions by Tea and Coffee dust 60 Figure 4.21 pH optimization for Adsorption/Reduction of Cr (VI) by tea dust 60 Figure 4.22 pH optimization for Adsorption /Reduction of Cr (VI) ... Reduction /Adsorption of Cr (VI) ions by Tea dust 67 Figure 4.30 Kinetic study for the Reduction /Adsorption of Cr (VI) ions by Coffee dust 68 Figure 4.31 Adsorption Isotherm for Cr (VI) adsorption...

Ngày tải lên: 15/09/2015, 22:51

... phase remaining after acid suspension separation was used for investigations on the clarification of turbid waters [11,12] The model aqueous solutions with determined concentrations of potassium ... removal from aqueous model solutions are presented in Table The greatest removal for both types of solutions at the studied conditions was observed when the acid to mud ratio was 20 ml acid per ... the investigations on red mud wasted from Guinean bauxite and its utilization for phosphate removal from aqueous solutions are discussed Experimental procedure Red mud was obtained from a bauxite...

Ngày tải lên: 23/09/2012, 14:47

... acetonitrile from aqueous solutions to circumvent possible future supply disruption from interfering with essential industrial and laboratory work The separation of acetonitrile from aqueous solutions using ... affect adsorption behaviour over the full range of activities as well 6.1.3 Radial Distribution Functions Radial distribution or pair correlation functions (RDF) are the primary connection between ... acetonitrile purification from aqueous solutions, the general trend of selectivity of acetonitrile over water is that the selectivity decreases as acetonitrile composition increases The hydrophobic...

Ngày tải lên: 30/09/2015, 10:13

... adsorption affinity and chemical reaction Adsorption affinity includes molecule-surface interaction, electrostatic interaction (i.e., ion exchange, coulombic attraction); while chemical reaction ... utilizing rice husks modified with ammonium to produce “quaternized rice husk as adsorbents A strong pH dependency (pH - 10) was observed and the estimated maximum sorption capacity of quaternized rice ... and iron), the adsorption affinity and chemical reaction may occur simultaneously Surface charge results from protonation, dissociation, and/or surface complexation reactions of reactive surface...

Ngày tải lên: 05/09/2013, 09:38

Ngày tải lên: 13/03/2015, 10:12

... Water and Environment Technology, Vol 8, No.4, 2010 Removal of cadmium from aqueous solutions For estimating the removal rate, time courses of cadmium concentration in aqueous solution and calculated ... 33, 635-643 Babić B M., Milonjić S K., Polovina M J., Ćupić S and Kaludjerović B V (2002) Adsorption of zinc, cadmium and mercury ions from aqueous solutions on an activated carbon cloth, Carbon, ... (right axis)) CONCLUSIONS Removal of cadmium from aqueous solutions by the charcoals prepared from the stalk of giant reed was investigated based on the beneficial utilization of giant reed As...

Ngày tải lên: 05/09/2013, 10:15

... work was to study the adsorption responsible for the adsorption capacity of some of BB159 from aqueous solution onto banana peel specific solutes through ionic interactions Natural as a low cost ... kinetics for BB159 adsorption on banana peel the Elovich equation, it is presumed that αβt >> Elovich and by applying the boundary conditions qt= at t The Elovich equation is given as follows [17]: ... equilibrium adsorption The stock solution was prepared by dissolving qe(mgg-1) was calculated using the equation 1: accurately weighted dye in distilled water to the concentration of 1000 mgl-1...

Ngày tải lên: 06/05/2014, 09:02

... As(V) stock solution These stock solutions were used to prepare experimental solutions of speci®ed concentrations One gram of red mud powder was placed in a conical ¯ask Solutions containing 125 ... AR The adsorption of various pollutants from aqueous solutions on to activated carbon Wat Res 1985;14:277 [25] Panday KK, Prasad G, Singh VN Copper (II) removal from aqueous solution by ¯y ash ... its As(III) and As(V) adsorption characteristics Batch experiments show that red mud is capable of removing arsenic from aqueous solutions As(III) and As(V) adsorptions are equilibrated within...

Ngày tải lên: 13/07/2014, 06:20

... filtration of individual Hg(II) and HA solutions; sequential adsorption and filtration of individual Hg(II) and HA solutions; co-adsorption and co-filtration of solutions containing both Hg (II) and ... Conclusion 51 CHAPTER SIMULTANEOUS DETECTION AND REMOVAL OF MERCURY IONS IN AQUEOUS SOLUTIONS BY TPPS FUNCTIONALIZED CS/CA MULTIFUNCTIONAL MEMBRANE 52 4.1 Introduction ... metal ions from contaminated water, such as chemical precipitation, solvent extraction, ion exchange, membrane separation and adsorption Among all the efforts, adsorption and membrane separation...

Ngày tải lên: 09/09/2015, 17:52

... solute ions or molecules from the surrounding solutions) , thereby giving rise to high adsorption capacities and fast kinetics To fully separate them from treated effluents or waste solutions for ... applications as well, such as for heavy metal removal from aqueous solutions vii The adsorptive removal of palladium (II) in aqueous solutions with P4VP nanoparticles as adsorbent was further ... palladium in aqueous solutions The P4VP nanoparticles were prepared through a surfactant-free emulsion polymerization (SFEP) method from 4vinylpyridine (4VP) as the monomer, with divinylbenzene...

Ngày tải lên: 10/09/2015, 15:54

... between conversion, adsorption, and distribution in aqueous environment were established Accordingly, these chemicals are accessible to living organisms in aqueous environment receiving effluent ... per trillion mole ppb - Parts per billion ppm - Parts per million ppt - Parts per trillion PVA - Polyvinyl alcohol RO - Reverse Osmosis SAR - Selective adsorption ratio SRT – Sludge retention time ... distribution of immobilized MIP and NIP 97 Fig 4-7 Adsorption isotherms of MIP and NIP for E1 in aqueous solution 104 Fig 4-8 Adsorption isotherms of MIP and NIP for E2 in aqueous solution 104...

Ngày tải lên: 11/09/2015, 10:15

... desorption mechanism can be explained from the combined effects of both protonation-deprotonation equilibrium and Cu ion adsorptiondesorption equilibrium Then, a modified suspension polymerization ... heavy metal ions from aqueous solutions Diethylenetriamine (DETA) functionalized PGMA was efficient and selective for the removal of Cu ions Acid can be used as an effective desorption agent However, ... and with different ionic strengths in the solutions Figure 3.7 Desorption efficiency of copper ions from the PGMA-DETA adsorbent in solutions with different HNO3 concentrations Figure 3.8 N1s...

Ngày tải lên: 14/09/2015, 08:48

... application for dye bioaccumulation from aqueous solution Bioresource Technology 2012, 105, 100-105 29 Witek-Krowiak, A.; Szafran, R G.; Modelski, S., Biosorption of heavy metals from aqueous solutions ... dyes from aqueous solutions by rice husk Desalination 2011, 272 (1), 313-322 34 Deng, H.; Lu, J.; Li, G.; Zhang, G.; Wang, X., Adsorption of methylene blue on adsorbent materials produced from ... application for cationic dye adsorption Environmental Science and Pollution Research 2013, 20 (1), 543-551 26 Aksu, Z., Application of biosorption for the removal of organic pollutants: a review...

Ngày tải lên: 26/09/2015, 11:07

... Remediation of Cr (VI) and Pb(II) Aqueous Solutions Using Supported, Nanoscale Zero-valent Iron, Environ Sci Technol 34 (2000) 2564 [3] R.S Bowman, Applications of surfactantmodified zeolites to environmental ... formation of Fe(OH)3 during high pH value 3.3.Effect of initial Cr (VI) concentration Experimental conditions: Fe0 dosage = 0,1g/l, pH = 4-5, Cr (VI) concentration from 15.0mg/l The reaction solution ... 0.4 0.2 0 [Cr (VI) ]/[Cr (VI) ]0 20 40 60 Cr (VI) = 1.0 mg/l 1.2 Time(min) Cr (VI) = 2.0 mg/l Cr (VI) = 3.0 mg/l 0.8 Cr (VI) = 4.0 mg/l Fig Effect of iron nanoparticals concentration Cr (VI) = 5.0 mg/l...

Ngày tải lên: 14/03/2014, 10:20

... calculated using the following Eq from the thermogravimetric analysis [31] It was found to be 1.96 molecules/nm2 The graft density can also be calculated from the XPS data [31] (Table 2) using Eq 2, from ... above mentioned mixed solution to a 200 mL aqueous solution of ammonia maintained at a pH * 10, in an inert atmosphere The mixture was subsequently stirred for 30 After the precipitation, it was ... the formation of phosphonic acid ester, (by the reaction of surface –OH groups with the phosphonic acid although hydrogen bonding could be a stronger reason) resulting in the formation of metal–phosphonate...

Ngày tải lên: 21/06/2014, 22:20

... of solutions was adjusted by using diluted solution of NaOH and HCl The temperature of the solutions (25 °C, 35 °C, 45 °C) was controlled with the thermostatic bath The adsorbed amount of Cr (VI) ... the maximum capacity of Cr (VI) absorption occurred at pH of The explanation would be addressed as the pH of the aqueous solution affects to stability of chromium speciation and the surface charge ... extent in acidic solution This results in the stronger attraction for negatively charged ions − Electrostatic interaction between the sorbent and HCrO4 ions also contributes to the high chromium...

Ngày tải lên: 02/07/2014, 14:14

... dealt with in most conventional methods Once the system is trained, the text location is very fast by simply using the features generated from contours, while many conventional methods need time ... Segmentation of uniform-coloured text from colour graphics background IEE Proceedings, 1997, Vol 144, pp 332-338 [7] B.T Chun, Y Bae, and T.Y Kim Automatic Text Extraction in Digital Videos using ... analysis; 4) Contours classification using neural network; 5) Text area binarization Details of the above steps are further elaborated in the ensuing subsections Figure Sample name card image...

Ngày tải lên: 05/11/2012, 14:54

... A/S Combating NOx from refinery sources using SCR Page of 31 the formation of sulphuric acid mist from reaction of SO3 with water vapour can give rise to the formation of a visible, blue plume ... between accumulated chromium and activity, there is no direct correlation between service hours and activity cf Figure 7, which means that the chromium uptake Information contained herein is confidential; ... diffusion barrier show the highest deactivation at the medium temperature The behaviour of the chromium- poisoned SCR catalyst is a result of the catalytic properties of chromium oxide Chromium...

Ngày tải lên: 14/03/2014, 10:20

... Selective detection of superoxide anion radicals A Reaction conditions To determine the optimum reaction conditions for the analysis of O2–Æ, the effect of buffer solution and the concentration of the ... correlation between the fluorescence intensity of the extracts and the regression equation The average recovery test was carried out using the standard addition method, and the RSD was obtained from ... superoxide dismutase, tert-butyl hydroperoxide (70% aqueous solution), H2O2 (30% aqueous solution), sodium hypochlorite (NaOCl, 5% aqueous solution), dimethylsulfoxide, 3-morpholinosydnonimine hydrochloride,...

Ngày tải lên: 16/03/2014, 11:20

... glycosylation steps Noncovalent interactions involvingamino acid residues at position 39 Noncovalent interactions involving amino acid residues at position 451 Noncovalent interaction Expression for ... interaction length result in energy alteration (as when D is at position 451), whereas larger interaction length (as when S is at position 451) results in interaction disruption A similar behavior ... energy of individual noncovalent interactions are described below The reaction mechanism of family b-glycosidases has a glycosylation (from E + S to E–G) and a deglycosylation (from E–G to E...

Ngày tải lên: 16/03/2014, 18:20