A kinetics and thermodynamics study of methylene blue adsorption on wheat shells

Bulut, Yasemin; Aydın, Haluk

doi:10.1016/j.desal.2005.10.032

Cited by 1,112 publications

(501 citation statements)

References 18 publications

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“…Iqbal and Ashiq (2007) reported ΔSº negative values for the adsorption of the following dyes from aqueous solutions on activated carbon: alizarine red-S, methyl blue, methylene blue, eriochrome black-T, malachite green, phenol red and methyl violet, indicating that the randomness at the solid-solution interface decreased during adsorption. However in case of dye bromophenol blue, the entropy increased like in the present work and the same phenomenon was reported by Gupta et al (1997), Gupta et al (2003), Silva et al (2004), Bulut and Aydin (2006) for others dyes. These differences may be attributed to the physical and chemical characteristics of the dyes and adsorbents, which play an important role in adsorption.…”

Section: Adsorption Thermodynamicssupporting

confidence: 71%

“…The positive value of ΔSº suggested increased randomness at the solid/solution interface with some structural changes in the adsorbate and the adsorbent and an affinity of the adsorbent toward dye (Srivastava et al, 2006). Though the adsorption of dyes is currently described as an exothermic phenomenon (Jain et al, 2003;Iqbal and Ashiq, 2007), endothermic adsorption was also reported in the literature: acid orange 7 dye in aqueous solutions using spent brewery grains (Silva et al, 2004), methylene blue adsorption using wheat shells (Bulut and Aydin, 2006) and malachite green and basic red using activated carbon and activated slag (Gupta et al, 1997;Gupta et al, 2003). Iqbal and Ashiq (2007) reported ΔSº negative values for the adsorption of the following dyes from aqueous solutions on activated carbon: alizarine red-S, methyl blue, methylene blue, eriochrome black-T, malachite green, phenol red and methyl violet, indicating that the randomness at the solid-solution interface decreased during adsorption.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

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Adsorption of remazol brilliant blue on an orange peel adsorbent

Mafra

Igarashi‐Mafra

Zuim

et al. 2013

Braz. J. Chem. Eng.

136

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-A novel orange peel adsorbent developed from an agricultural waste material was characterised and utilised for the removal of Remazol Brilliant Blue from an artificial textile-dye effluent. The adsorption thermodynamics of this dye-adsorbent pair was studied in a series of equilibrium experiments. The time to reach equilibrium was 15 h for the concentration range of 30 mg L -1 to 250 mg L -1 . The adsorption capacity decreased with increasing temperature, from 9.7 mg L -1 at 20 °C to 5.0 mg L -1 at 60 °C. Both the Langmuir and Freundlich isotherm models fitted the adsorption data quite reasonably. The thermodynamic analysis of dye adsorption onto the orange peel adsorbent indicated its endothermic and spontaneous nature. Thus, the application of orange peel adsorbent for the removal of dye from a synthetic textile effluent was successfully demonstrated.

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Section: Adsorption Thermodynamicssupporting

confidence: 71%

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Adsorption of remazol brilliant blue on an orange peel adsorbent

Mafra

Igarashi‐Mafra

Zuim

et al. 2013

Braz. J. Chem. Eng.

136

View full text Add to dashboard Cite

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“…This increase in adsorption relates to an increase in surface area of adsorbent, which leads to an increase in binding sites thus facilitating the reaction between adsorbent and adsorbate [40]. Adsorption increase with increase of soil content is also reported [41].…”

Section: Adsorption Trendsmentioning

confidence: 89%

Remediation of deltamethrin contaminated cotton fields: residual and adsorption assessment

et al. 2016

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Pakistan occupies a significant global position in the growing of high quality cotton. The extensive application of pesticides on agricultural products leads to environmental risk due to toxic residues in air, water and soil. This study examined the chemodynamic effect of Deltamethrin on cotton fields. Samples were collected from the cotton fields of D.G. Khan, Pakistan and analyzed for heavy metal speciation patterns. Batch experiments were administered in order to study the adsorption of Deltamethrin in cotton fields. The effect of different factors including pH, adsorbate dose, and adsorbent mass on adsorption were studied. It was observed that in general, adsorption increased with increases in the mass of adsorbate, although the trends were irregular. Residual fractions of deltamethrin in the soil and water of cotton fields were analyzed to assess concentrations of xenobiotics bound to soil particles. Results indicated that such residues are significantly higher in soil samples due to high Koc in comparison to water, indicating the former is an efficient degradation agent. Results from the batch experiment resulted in 95% removal with alkaline pH and an adsorbent-adsorbate ratio of 250:1. These results may be used to environment friendly resource management policies.

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“…Many low-cost adsorbents such as waste materials from agriculture and industry have been proposed by several workers and they showed very good performance for removal of MB [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%