Adsorptive removal of basic dyes from aqueous solutions by surfactant modified bentonite clay (organoclay): Kinetic and competitive adsorption isotherm

2015 ◽  
Vol 95 ◽  
pp. 215-225 ◽  
Author(s):  
T.S. Anirudhan ◽  
M. Ramachandran
Keyword(s):  
Adsorption Isotherm ◽  
Aqueous Solutions ◽  
Competitive Adsorption ◽  
Bentonite Clay ◽  
Modified Bentonite ◽  
Adsorptive Removal ◽  
Basic Dyes

Adsorptive removal of acid red from aqueous solutions by cationic surfactant-modified bentonite clay

2014 ◽  
Vol 56 (7) ◽  
pp. 1929-1939 ◽  
Author(s):  
Manohar D. Mullassery ◽  
Noeline B. Fernandez ◽  
Thayyath S. Anirudhan
Keyword(s):  
Aqueous Solutions ◽  
Cationic Surfactant ◽  
Bentonite Clay ◽  
Modified Bentonite ◽  
Adsorptive Removal

Use of HCl-modified bentonite clay for the adsorption of Acid Blue 129 from aqueous solutions

2015 ◽  
Vol 57 (19) ◽  
pp. 8894-8903 ◽  
Author(s):  
Zia Ullah ◽  
Sajjad Hussain ◽  
Saima Gul ◽  
Sabir Khan ◽  
F.K. Bangash
Keyword(s):  
Aqueous Solutions ◽  
Bentonite Clay ◽  
Modified Bentonite ◽  
Acid Blue 129 ◽  
Acid Blue

Simultaneous sorption of As, B, Cr, Mo and Se from coal fly ash leachates by Al3+-pillared bentonite clay: implication for the construction of activated geo-synthetic clay liner

2017 ◽  
Vol 12 (1) ◽  
pp. 186-201 ◽  
Author(s):  
Vhahangwele Masindi ◽  
W. Mugera Gitari ◽  
Hlanganani Tutu
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Coal Fly Ash ◽  
Bentonite Clay ◽  
Order Kinetic ◽  
Modified Bentonite ◽  
Adsorption Affinity ◽  
Freundlich Adsorption Isotherm ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The present study reports the optimum conditions for intercalating the Al3+ species to bentonite clay matrices and evaluate the potential of using Al3+-modified bentonite clay (Alum-Bent) for removal of oxyanionic species of As, B, Cr, Mo and Se from coal fly ash (FA) leachates. Removal of oxyanionic species was done in batch experimental procedures. Parameters optimized were: contact time, adsorbent dosage, concentration and pH. The adsorption affinity of Al3+-bentonite clay for oxyanionic species varied as follows: B ≈ Se > Mo > Cr ≈ As respectively. The adsorption data fitted better to Langmuir adsorption isotherm than Freundlich adsorption isotherm hence confirming mono-site adsorption. The adsorption kinetics fitted well pseudo-second-order kinetic model hence confirming chemisorption. The fact that most of the oxyanion were adsorbed at pH ≥ pHpzc indicated that both electrostatic and chemical interactions occurred with the clay surface and interlayers. The Al3+-modified bentonite clay successfully removed oxyanion species from generated coal FA leachates. This study shows that Al3+-modified bentonite clay is an effective adsorbent for oxyanion species in coal FA leachates and could be applied as a reactive barrier in coal FA retention ponds.

scholarly journals Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

2020 ◽  
Vol 10 (12) ◽  
Author(s):  
Olutayo A. Oluyinka ◽  
Alpesh V. Patel ◽  
Bhavna A. Shah ◽  
Maryam I. Bagia
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Aqueous Solutions ◽  
Raw Materials ◽  
Sugar Industry ◽  
Advanced Characterization ◽  
X Ray ◽  
Adsorptive Removal ◽  
Bagasse Fly Ash ◽  
Wide Range

Abstractp-Nitroaniline (PNAN) and nitrobenzene (NB) being important raw materials and intermediates for the production of a wide range of chemical products have the potential of constituting water pollutants. Hence, the development of the means of removing these chemicals from water would go a long way to safeguard the health of the environment. The goal of this research was to transform bagasse fly ash (BFA), solid waste from the sugar industry into porous zeolitic adsorbents MgFZBFA and MgMZBFA and examine them for their adsorptive removal of PNAN and NB from aqueous solutions. The syntheses of the sorbents involve alkali fusion technique and microwave hydrothermal treatment for the desired properties. Advanced characterization techniques such as FTIR (Fourier transform infrared spectroscopy), XRF (X-ray fluorescence spectroscopy), XRD (X-ray diffraction spectroscopy), SEM (scanning electron microscopy), Brunauer–Emmett–Teller (BET)/Barrett–Joyner–Halenda (BJH) Method, and TGA (thermogravimetric analysis) were used for the characterization and evaluation of the sorbents’ properties. The adsorptive removal of PNAN and NB from aqueous solutions by MgFZBFA and MgMZBFA were investigated. Various parameters such as pH, adsorbent dosage, initial sorbate concentration were optimized during the adsorption experiment to achieve best performance. Adsorption isotherm, kinetics and dynamics were studied. It was found that Langmuir adsorption isotherm model better represents the adsorption processes and that the processes follow pseudo-second-order kinetics. More so, the sorption processes were most possibly completed by both surface sorption (liquid-film diffusion) and intra-particle diffusion. The maximum sorption capacities observed with MgFZBFA for PNAN and NB are 30.86 mg g−1 and 19.92 mg g−1, while with MgMZBFA the values are 12.72 mg g−1 and 10.20 mg g−1, respectively. The performances of MgFZBFA and MgMZBFA for the sorption of PNAN and NB were compared with some adsorbents previously studied for the same purpose, and results show that the adsorbents in the present study exhibit better performances. The application as materials of cheap source for the removal of PNAN and NB from contaminated water could be considered.

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