Equilibrium studies for the adsorption of Acid dye onto modified hectorite

Baskaralingam, P.; Pulikesi, M.; Ramamurthi, V.; Sivanesan, S.

doi:10.1016/j.jhazmat.2006.01.011

Cited by 82 publications

(40 citation statements)

References 13 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The essential characteristics of the Langmuir equation can be expressed in terms of a dimensionless constant which is defined as: (4) where K L is the Langmuir constant (dm 3 /mg), which is used to determine the enthalpy of adsorption, and C i is the highest initial dye concentration employed. The value of R L indicates whether the type of isotherm observed is unfavourable (R L Ͼ 1), linear (R L ϭ 1) or favourable (R L Ͻ 1) (Baskaralingam et al 2006). The R L values are listed in Table 1 along with the other Langmuir constants obtained.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…The presence of new vibrational bands (SD1 to SD7) in the IR spectrum confirmed the interaction of AO 10 with CPC. The sulphite group of the dye [corresponding to bands D1 to D6 (Muthukumar et al 2007)] interacts with the pyridinium ion [corresponding to bands S1 to S5 (Clements et al 1973) Because of the negative surface charge of the clay, the surface of natural montmorillonite is not an effective adsorbent for the removal of anionic species from aqueous solution. However, the surface charge of natural MMT can be made positive by treating it with cationic surfactants (CPC and CTAB) in excess of the cation-exchange capacity of the clay.…”

Section: Mechanism Of the Adsorptive Processmentioning

confidence: 99%

“…Apart from having the potential of bioaccumulation in the food chain, some dyes, dye precursors and their biotransformation products, such as aromatic amines, have been found to be toxic, mutagenic and carcinogenic in nature (Lourenco et al 2000;Sani and Banerjee 1999;Chung and Cerniglia 1992).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption Characteristics of Acid Orange 10 from Aqueous Solutions onto Montmorillonite Clay

Kaur

Datta

2011

Adsorption Science & Technology

View full text Add to dashboard Cite

Azo dyes have been identified as the most toxic of all dyes since they may be converted into potentially carcinogenic and/or mutagenic amines as a result of the reductive cleavage of the azo linkages after being released into the aquatic environment. Azo dyes are extensively used in industries such as textile, paint, plastic, cosmetic and paper. The aim of the present work was to develop a clay-based methodology which could successfully be employed for the removal of dyes from aqueous solution. The adsorption characteristics of C.I. Acid Orange 10 (AO 10) onto montmorillonite (MMT) and surfactant-modified MMT have been studied as a function of the dye concentration, the pH of the aqueous dye solution and the contact time. The dye adsorption efficiency of MMT was found to be much less than that of surfactant-modified MMT (CTAB-MMT and CPC-MMT), with 100% adsorption efficiency being observed for the removal of 160 ppm and 220 ppm of the dye by CTAB-MMT and CPC-MMT, respectively. In both cases, the adsorption data could be fitted by the Langmuir adsorption isotherm.

show abstract

Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Mechanism Of the Adsorptive Processmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption Characteristics of Acid Orange 10 from Aqueous Solutions onto Montmorillonite Clay

Kaur

Datta

2011

Adsorption Science & Technology

View full text Add to dashboard Cite

show abstract

“…This might be due to activation of interior biosorbent surface and production of more binding sites for dyes (Batzias and Sidiras, 2007). Cationic surfactant (CTAB) increased the biosorbent capacity due to impregnation of positive charge on the rice husk surface and produced an electrostatic attraction with negative dye molecules (Baskaralingam et al, 2006). Non-ionic surfactants showed no effect on the biosorbent capacity of rice husk biomass.…”

Section: Effect Of Modifications/treatmentsmentioning

confidence: 99%

Adsorptive removal of direct dyes by low cost rice husk: Effect of treatments and modifications

Safa¹,

Bhatti²

2011

Afr. J. Biotechnol.

View full text Add to dashboard Cite

In the present study, free, carboxymethyl cellulose (CMC)-immobilized, polyvinyl alcohol (PVA)-alginate immobilized and chemically treated rice husk biomass was used for the biosorption of Everdirect Orange-3GL and Direct Blue-67 dyes. Maximum biosorption capacity of free, immobilized and hydrochloric acid treated biomass was observed for both dyes at low pH. Comparative study of free, immobilized and HCl treated biomass showed that, the HCl treated biomass exhibited more biosorption capacity (29.98 and 37.92 mg/g) for Everdirect Orange-3GL and Direct Blue-67, respectively. Equilibrium time was less for HCl treated biomass when compared with immobilized biomass. The Langmuir type 1 and 2 models were best fitted to experimental data for free, CMC, polyvinyl alcohol-alginate immobilized and HCl treated biomass in case of Everdirect Orange-3GL, while the equilibrium data of Direct Blue-67 followed the Langmuir type 2 isotherm. Pseudo-second-order and Elovich kinetic models illustrated good fitness to all types of biomasses showing chemisorption nature of biosorption. The amount of dyes sorbed (mg/g) increased with increase in temperature. The values of Gibbs free energy (∆G°) showed that reaction was spontaneous at high temperature.

show abstract

“…Clay minerals in soil play the role of a natural scavenger of pollutants from water through both ion exchange and adsorption mechanism. (Baskaralingam et al 2006) Considering favourable characteristics, adsorption of metal ions and other substances on clays has received considerable attention. For example, illite has been shown to absorb Cd (II) and natural bentonite eliminates zinc from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Nickel (Ii) Ions from Electroplating Rinse Water Using Hectorite Clay

Ramamurthi¹,

Priya²,

Saranya³

et al. 2009

MAS

View full text Add to dashboard Cite

This paper describes the recovery of Ni (II) from electroplating rinse water using the Hectorite clay. Batch mode adsorption experiments were carried out and the effect of contact time, adsorbent dosage, pH, initial metal ion concentration and temperature were studied. Different isotherms were obtained using nickel electroplating rinse waters of various concentrations. The ion exchange process follows second order kinetics and langmuir isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy and enthalpy for the ion-exchange of Ni (II) from electroplating rinse water on Hectorite clay, revealed that the ion-exchange process was spontaneous and exothermic under different temperatures. The maximum adsorption capacity obtained was 62.24 mg/g at pH 7-8, the optimum adsorbent dosage and contact time was found to be 2 g/l within 5hours.

show abstract

Equilibrium studies for the adsorption of Acid dye onto modified hectorite

Cited by 82 publications

References 13 publications

Adsorption Characteristics of Acid Orange 10 from Aqueous Solutions onto Montmorillonite Clay

Adsorption Characteristics of Acid Orange 10 from Aqueous Solutions onto Montmorillonite Clay

Adsorptive removal of direct dyes by low cost rice husk: Effect of treatments and modifications

Recovery of Nickel (Ii) Ions from Electroplating Rinse Water Using Hectorite Clay

Contact Info

Product

Resources

About