Gautam Kumar Sarma

Gauhati University

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Krishna G. Bhattacharyya

Assam Don Bosco University

Md. Harunar Rashid

Rajiv Gandhi University

Susmita Sen Gupta

Bridge University

Susmita SenGupta

New College of Florida

Xavy Borgohain

Rajiv Gandhi University

Ahmed Mohamed El‐Toni

King Saud University

Suresh Gupta

Birla Institute of Technology and Science, Pilani

Rosy Saikia

Gauhati University

Saddam Iraqui

Rajiv Gandhi University

Anakshi Boruah

Birla Institute of Technology and Science, Pilani

Cooperative Institutions

Rajiv Gandhi University

Gauhati University

King Saud University

Birla Institute of Technology and Science, Pilani

Rajiv Gandhi University of Health Sciences

Assam Don Bosco University

Central Metallurgical Research and Development Institute

National Institute of Advanced Industrial Science and Technology

Tohoku University

Indian Association for the Cultivation of Science

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ADSORPTIVE REMOVAL OF CATIONIC AND ANIONIC DYES FROM WATER: A CASE STUDY WITH KAOLINITE AND ACID-TREATED KAOLINITE

Journal of Applied and Fundamental Sciences (2015)

Gautam Kumar Sarma

One of the most common clay mineral, kaolinite was tested in this work as adsorbents for both a cationic dye, Methylene Blue and an anionic dye, Congo red. The clay mineral was further modified by treatment with 0.25 and 0.50 M H 2 SO 4 . The influences of pH, interaction time, clay mineral amount and dye concentration on the adsorption process were monitored and explained on the basis of physico-chemical characteristics of the clay mineral and the behavior of the dye molecules. The optimum pH for both Methylene Blue and Congo red adsorption ware 10.0 and 6.0 respectively. Adsorption was very rapid initially for ~ 30 min and then slowly attained equilibrium. The adsorption rate processes followed a second order kinetic model. The Langmuir monolayer capacity of kaolinite increased after acid treatment. The results suggest that kaolinite and its acid-treated forms would be suitable for removing both Methylene Blue and Congo red from aqueous solution through adsorption-mediated surface immobilization.

Congo red

Methylene blue

Langmuir adsorption model

Cationic polymerization

Mineral acid

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Citations (2)

Shape-tunable CuO-Nd(OH)3 nanocomposites with excellent adsorption capacity in organic dye removal and regeneration of spent adsorbent to reduce secondary waste

Journal of Hazardous Materials (2019)

Gautam Kumar Sarma Aslam Khan Ahmed Mohamed El‐Toni Md. Harunar Rashid

Chemisorption

Langmuir adsorption model

10.1016/j.jhazmat.2019.120838

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Citations (50)

Interactions of the dye, Rhodamine B with kaolinite and montmorillonite in water

Applied Clay Science (2014)

Krishna G. Bhattacharyya Susmita SenGupta Gautam Kumar Sarma

Endothermic process

Rhodamine B

Langmuir adsorption model

10.1016/j.clay.2014.07.012

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Citations (114)

Synthesis of Mg/Al Layered Double Hydroxides for Adsorptive Removal of Fluoride from Water: A Mechanistic and Kinetic Study

Journal of Chemical & Engineering Data (2018)

Gautam Kumar Sarma Md. Harunar Rashid

Herein, we report the synthesis of Mg/Al-CO3 layered double hydroxides (LDHs) by the urea hydrolysis method under hydrothermal conditions at different aging times. The LDHs were characterized by different microscopic, spectroscopic, diffractometric, and thermal analysis techniques. The as-prepared LDHs were then used as adsorbents for the removal of fluoride ions from water. The adsorption process was systematically studied in terms of influences of pH, interaction time, temperature, adsorbent loading, fluoride ion concentration, and the effect of coexisting anions to understand the ideal conditions for adsorption. The adsorption process primarily followed pseudo-second-order kinetics. The Langmuir monolayer adsorption capacities of different adsorbents are in the range of 15.13–27.03 mg g–1 at 303 K. The hydrothermal aging time has a negative impact on the adsorption capacities of the LDHs. The as-prepared LDHs are reusable up to five cycles of the fluoride ion adsorption–desorption process.

Layered double hydroxides

Langmuir adsorption model

10.1021/acs.jced.8b00242

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Citations (44)

RETRACTED: Adsorption of Crystal violet on raw and acid-treated montmorillonite, K10, in aqueous suspension

Journal of Environmental Management (2016)

Gautam Kumar Sarma Susmita Sen Gupta Krishna G. Bhattacharyya

Suspension

Aqueous suspension

Crystal violet

10.1016/j.jenvman.2016.01.038

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Citations (145)

Nanomaterials as versatile adsorbents for heavy metal ions in water: a review

Environmental Science and Pollution Research (2019)

Gautam Kumar Sarma Susmita Sen Gupta Krishna G. Bhattacharyya

Nanomaterials

Environmental Pollution

10.1007/s11356-018-04093-y

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Citations (238)

Montmorillonite K10: An Effective Adsorbent for Removal of a Toxic Reactive Mono-Azo Dye, Procion Red MX 5B, from Water

Journal of Surface Science and Technology (2014)

Gautam Kumar Sarma Susmita SenGupta Krishna G. Bhattacharyya

Reactive dyes are widely used in industry to dye cellulosic fibres, nylon, silk and wool. Azo dyes and their precursors are generally considered as human carcinogens and their presence in water is also a known health risk. The present study investigates utilization of the commercially available clay mineral, montmorillonite K10, to remove Procion red MX5B from water. Adsorption was carried out in a batch process with pH, dye concentration, amount of clay mineral, interaction time and temperature as the process variables. Montmorillonite K10 was characterized with XRD, FT-IR and Surface area measurement. Adsorption was favourable in acidic pH and highest adsorption was observed at pH 2. First and second order kinetic models, intra-particle and liquid film diffusion models were applied to the rate processes that showed the second order model to have the highest applicability. The adsorption capacity of the clay mineral was found by applying Langmuir isotherm which showed that the dye uptake was 11.04 mg g -1 at 303 K. The thermodynamic parameters of adsorption like enthalpy, entropy and Gibbs energy were also evaluated from experiments conducted over the temperature range, 293 to 323 K, and these were used to validate the observed endothermic interactions.

Endothermic process

Langmuir adsorption model

Reactive dye

10.18311/jsst/2014/1849

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Citations (2)

Utilization of clays and modified clays as adsorbents for dyes in water

Shodhganga (2014)

Gautam Kumar Sarma

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Citations (1)