Primary biosorption mechanism of lead (II) and cadmium (II) cations from aqueous solution by pomelo (Citrus maxima) fruit peels

2020 ◽  
Author(s):  
Van-Phuc Dinh ◽  
Tran Dong Xuan ◽  
Nguyen Quang Hung ◽  
Thi-Thuy Luu ◽  
Thi-Thanh-Thao Do ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Biosorption Mechanism ◽  
Citrus Maxima

scholarly journals Sustainable Durio zibethinus-Derived Biosorbents for Congo Red Removal from Aqueous Solution: Statistical Optimization, Isotherms and Mechanism Studies

2021 ◽  
Vol 13 (23) ◽  
pp. 13264
Author(s):  
A. A. Oyekanmi ◽  
Akil Ahmad ◽  
Siti Hamidah Mohd Setapar ◽  
Mohammed B. Alshammari ◽  
Mohammad Jawaid ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Contact Time ◽  
Initial Concentration ◽  
Operational Conditions ◽  
Durio Zibethinus ◽  
Biosorption Mechanism ◽  
Langmuir Isotherm Model ◽  
Ft Ir ◽  
Operational Range

This investigation reports on the biosorption mechanism of Congo Red dyes (CR) in aqueous solution using acid-treated durian peels, prepared for this study. The biosorbent nature was characterized using the Scanning Electron Microscopy (SEM), Fourier Transform infrared spectroscopy (FT-IR) and Brunaure-Emmet-Teller (BET). The effect of process parameters within operational range of pH (2–9), contact time (10–200 min), initial concentration (25–400 mg g−1) and temperature (25–65 °C) for the optimum removal of CR dyes was investigated using central composite design (CCD) under response surface methodology (RSM), and revealed that the optimum condition of biosorption was achieved around a pH of 5.5, contact time of 105 min at initial concentration of 212.5 mg L−1 within 45 °C temperature, which corresponds to 95.2% percent removal of CR. The experimental data fitted better to the second order polynomial model, with a correlation coefficient R2 value of 0.9917 and the Langmuir isotherm model with biosorption capacity of 107.52 mg g−1. Gibbs free energy indicated that the adsorption of CR dyes was spontaneous. The mechanism of the adsorption of CR dyes revealed that the biosorption of CR dyes investigated under different operational conditions show that under acidic pH, the adsorption efficiency of the acid treated durian peels is enhanced for the adsorption of CR dye molecules.

Biosorption mechanism of Zn2+ from aqueous solution by spent substrates of pleurotus ostreatus

2014 ◽  
Vol 31 (11) ◽  
pp. 1911-1918 ◽  
Author(s):  
XiaoJing Hu ◽  
LiLong Yan ◽  
Haidong Gu ◽  
TingTing Zang ◽  
Yu Jin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Pleurotus Ostreatus ◽  
Biosorption Mechanism

Application of Mangifera indica (mango) seeds as a biosorbent for removal of Victazol Orange 3R dye from aqueous solution and study of the biosorption mechanism

2012 ◽  
Vol 209 ◽  
pp. 577-588 ◽  
Author(s):  
Wagner S. Alencar ◽  
Elie Acayanka ◽  
Eder C. Lima ◽  
Betina Royer ◽  
Felipe E. de Souza ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Mangifera Indica ◽  
Biosorption Mechanism

scholarly journals Biosorption mechanism of Methylene Blue from aqueous solution onto White Pine (Pinus durangensis) sawdust: Effect of operating conditions

2017 ◽  
Vol 27 (1) ◽  
pp. 32-40 ◽  
Author(s):  
Jacob J. Salazar-Rabago ◽  
Roberto Leyva-Ramos ◽  
Jose Rivera-Utrilla ◽  
Raul Ocampo-Perez ◽  
Felipe J. Cerino-Cordova
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Operating Conditions ◽  
White Pine ◽  
Biosorption Mechanism

Adsorption Studies of Citrus maxima (Pomelo) Fruit Peels in the Removal of Lead (II) from Aqueous Solution

2015 ◽  
Vol 799-800 ◽  
pp. 37-41
Author(s):  
Eduardo R. Magdaluyo ◽  
Mark Gilbert B. Baltazar
Keyword(s):  
Aqueous Solution ◽  
Surface Morphology ◽  
Design Of Experiment ◽  
Lead Adsorption ◽  
Adsorption Time ◽  
Adsorption Studies ◽  
Adsorbate Concentration ◽  
Infrared Spectral ◽  
Citrus Maxima ◽  
Percent Removal

The ability of Citrus maxima or pomelo fruit peels for the removal of lead (II) ions in water was investigated. The influence of the different parameters such as pH, adsorption time, initial adsorbate concentration and adsorbent dosage in the adsorption characteristics was evaluated following the factorial design of experiment. Infrared spectral analyses of the adsorbent revealed the presence of hydroxyl and carboxyl bands in the structural backbone. Presence of plate-like and non-uniformity surface morphology can also be observed. Lead favors neutral to weakly basic conditions to achieve high percent removal. Lead adsorption studies in Citrus maxima followed the Temkin isotherm.

Removal of Cr(VI) and Ni(II) from aqueous solution by fused yeast: Study of cations release and biosorption mechanism

2008 ◽  
Vol 158 (2-3) ◽  
pp. 568-576 ◽  
Author(s):  
Hua Yin ◽  
Baoyan He ◽  
Hui Peng ◽  
Jinshao Ye ◽  
Feng Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Biosorption Mechanism

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

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