Adsorption Characteristics of Methylene Blue from Aqueous Solution According to Physical and Surface Properties of Activated Carbons

Methylene blue (MB) was used as model molecule to investigate the effects of surface properties and solvent pH values on the adsorption and desorption (or release) behaviors of mesoporous SBA-15 materials. It was found that the treatment of SBA-15 with a pH 7.8 aqueous solution can enhance the adsorption rate and capacity in comparison with the pristine SBA-15. The effect of pH values on MB releasing from the weak base treated SBA-15 and the pristine one have been studied and been compared in pH values range from 0.5 to 7.0. Both of them showed a maximum releasing rate at about pH 2 and all of the treated SBA-15 samples showed a higher releasing quantity than the pristine ones. The influence mechanisms of base treatment on the adsorption ability and that of pH values on the releasing properties of SBA-15 samples have been analyzed and been discussed based on the composition, the morphology, the surface area and pore size distribution and adsorption/desorption measurements.

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Batch Adsorption Study of Methylene Blue in Aqueous Solution using Activated Carbons from Rice Husk and Coconut Shell

Journal of Applied Sciences and Environmental Management ◽

10.4314/jasem.v22i5.4 ◽

2018 ◽

Vol 22 (5) ◽

pp. 631

Author(s):

O. Edokpayi ◽

O Osemwenkhae ◽

BV Ayodele ◽

J Ossai ◽

SA Fadilat ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Rice Husk ◽

Activated Carbons ◽

Coconut Shell ◽

Batch Adsorption ◽

Adsorption Study

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Floating Separation between Collophanite and Dolomite Affected by Inorganic Interaction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.881-883.1665 ◽

2014 ◽

Vol 881-883 ◽

pp. 1665-1669

Author(s):

Xiao Tai He ◽

Qin Zhang ◽

Shu Hao Qin

Keyword(s):

Aqueous Solution ◽

Surface Properties ◽

Theoretical Basis ◽

Selective Adsorption ◽

Electric Properties ◽

Mineral Surface ◽

Negative Effects ◽

Adsorption Characteristics ◽

Research Findings ◽

Dissolved Components

According to the type of Guizhou marine sedimentary phosphorus ore, the main reason of refractory is the similar surface properties of collophane and dolomite.In addition,the interaction of dissolved components of mineral and external ion leads the new eguilibrium system in aqueous solution,which further affects the selective adsorption of the agent in mineral surface.Selecting collophanite-dolomite system as the research object, this article studies the effect of the interaction of some inorganic anions on the floatability difference of the two minerals in the flotation system. The effect of the interaction on the electric properties of the mineral surface and adsorption characteristics were also examined with the purpose to find out the interaction mechanism.It hopes to provide theoretical basis for practical mineral selection. The research findings shows that in the range of pH 3 to 5, the interaction of PO43- and SO42- has a better effect of the separation between collophanite and dolomite.The interactions of SiO32- and CO32- makes the floatability difference of collophanite and dolomite closer when the pH is greater than 9.25, and simultaneously shows some negative effects on the flotation separation of the two minerals.

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