Surface modification of low-cost bentonite adsorbents—A review

Alexander, Jock Asanja; Zaini, Muhammad Abbas Ahmad; Abdulsalam, Surajudeen; Aliyu, El-Nafaty Usman; Omeiza, Aroke Umar

doi:10.1080/02726351.2018.1438548

Cited by 63 publications

(31 citation statements)

References 79 publications

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“…In geotechnical engineering, bentonite has found various applications, especially in pollution control [1,2,3,4]. It is the most extensively used clay due to its abundance, low cost, and ease of availability [5,6]. Montmorillonite—the clay mineral—belongs to the smectite group of minerals and is the most common member of the clay minerals.…”

Section: Introductionmentioning

confidence: 99%

Modification of Bentonite with Cationic and Nonionic Surfactants: Structural and Textural Features

Andrunik¹,

Bajda²

2019

Materials

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Surfactant-modified clay minerals are known for their good sorption properties of both organic and inorganic compounds from aqueous solutions. However, the current knowledge regarding the effect of both cationic and nonionic surfactants on the properties of bentonite is still insufficient. Bentonite, with montmorillonite as the base clay, was modified with hexadecethyltrimethylammonium bromide (a cationic surfactant) in the amount of 1.0 cation exchange capacity (CEC) of bentonite and varying concentrations of t-octylphenoxypolyethoxyethanol (Triton X-100, a nonionic surfactant). We aimed to improve the understanding of the effect of nonionic and cationic surfactants on clay minerals. The modified bentonites were characterized by X-ray diffraction (XRD), thermogravimetric analysis/differential thermal analysis (TG/DTA), Fourier transform infrared spectrometry (FTIR), field emission scanning electron microscopy (SEM) and specific surface area and pore volume (BET). According to our results, the presence of a cationic surfactant significantly increased the amount of the adsorbed nonionic surfactant. Moreover, an increase in the concentration of nonionic surfactants is also associated with an increase in the effectiveness of the modification process. Our results indicate that the amount of nonionic surfactant used has a significant effect on the properties of the obtained hybrid material. Modification of bentonite with a nonionic surfactant did not cause an expansion of the interlayer space of smectite, regardless of the presence of a cationic surfactant. The modification process was found to significantly decrease the specific surface area of bentonite. Improvement of hydrophobic properties and thermal stability was also observed.

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Section: Introductionmentioning

confidence: 99%

Modification of Bentonite with Cationic and Nonionic Surfactants: Structural and Textural Features

Andrunik¹,

Bajda²

2019

Materials

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“…Adsorption process is very efficient, simple to be designed and operated; and it is relatively inexpensive (16 -18). The efficiency of adsorption processes is highly affected by the type of adsorbent, adsorbate properties and the compositions of waste stream (19). Clay minerals, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Activated carbon, AC, gave better adsorption efficiency than bentonite regarding amoxicillin removal from real wastewater. However, neither of the two adsorbents could completely remove amoxicillin due to the sorption competition from other substances which were also present in the wastewater (19). Balarak, et al, (20) used palm bark as adsorbent for AMX from aqueous solutions and reported an adsorption capacity of 35 mg/g.…”

Section: Introductionmentioning

confidence: 99%

Removal of Amoxicillin from Water by Adsorption on Water Treatment Residues

Barbooti

Zahraw

2020

Baghdad Sci.J

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The presence of residual antibiotics in water results in the development of antibiotics resistant genes. The available wastewater treatment systems are not capable of removing such antibiotics from sewage. Thus, antibiotics need to be removed before the discharge of wastewater. Adsorption is among the promising techniques for the wastewater treatment to aid the removal of a wide range of organic and inorganic pollutants. The present work is a contribution to the search for an economical method for the removal of low concentrations of amoxicillin (AMX) from water by adsorption on water treatment residue, WTR, taken from a local drinking water facility. The chemical composition and the adsorptive characteristics of the material were first evaluated using energy dispersive spectroscopy, EDS, and sorption of methylene blue, respectively. The porous character of the sorbent was modified by ignition. The application of the WTR for the adsorption of AMX was studied under various operating conditions including sorbent dosage, 2-20 g/L at room temperature; contact time 30-240 min.; and initial concentration range of the antibiotic, 0.00004-0.00012 M. facility. To aid the experimental work, statistical software was employed to design the experiments and evaluation of the results. Graphical and mathematical relationships have been established for the adsorption efficiency with the operating conditions. The adsorption capacity was calculated from the plot of the adsorbed drug against the sorbent content and found to be 19.966 µmol/g WTR. The sorption efficiency depends on the initial concentration and being better at low concentration (0.00004 M) and equilibrium time (within 100 mins.). The optimum conditions of the adsorption are: AMX Concentration, 0.00004 M; Contact time. The optimum conditions of the adsorption are: AMX Concentration, 0.00004 M; Contact time, 90 min., and WTR content of 15.5 g/L to give removal efficiency of 89.2%.

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“…Chitosan has high adsorption limits and shows great properties for substantial metals expulsion from watery arrangements [19]. Clay and clay minerals are among the most plentiful regular and modest inorganic filler materials that have been broadly examined on account of their solid adsorption and complexation capacity [20]. Bentonite is fundamentally expandable montmorillonite clay which has the smallest crystal size and subsequently the biggest inside also, outside surface zones for cation exchange.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hierarchical Bentonite/Chitosan/NiFe2O4 ternary nanocomposite and its efficiency in the removal of Pb(II) from aqueous medium

Thakurata¹,

Paul

Das³

et al. 2020

Environmental Engineering Research

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Lead is the most globally bountiful harmful substantial component in nature. Its utilization can be followed to verifiable occasions. The current work archives the combination, portrayal, and utilization of bentonite/chitosan/NiFe2O4 ternary novel nanocomposite. Nanostructured nickel ferrite was joined with chitosan and bentonite to frame a novel ternary nanocomposite. The nanocomposite was portrayed by FT-IR, powder XRD, VSM, and TEM investigation. All the logical outcomes affirm the fruitful arrangement of ternary composite. The as-blended nanomaterial was applied as nanoadsorbent for the evacuation of lead (II) from water. The ideal composite portion was 50 mg/100 mL was seen as profoundly powerful for the evacuation of 82% Pb (II) particles from 200 ppm watery arrangement. This ferromagnetic, minimal effort, the eco-accommodating nanocomposite may end up being helpful for the expulsion of lead from watery arrangement at the mechanical level.

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Surface modification of low-cost bentonite adsorbents—A review

Cited by 63 publications

References 79 publications

Modification of Bentonite with Cationic and Nonionic Surfactants: Structural and Textural Features

Modification of Bentonite with Cationic and Nonionic Surfactants: Structural and Textural Features

Removal of Amoxicillin from Water by Adsorption on Water Treatment Residues

Fabrication of hierarchical Bentonite/Chitosan/NiFe2O4 ternary nanocomposite and its efficiency in the removal of Pb(II) from aqueous medium

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