Efficient and highly selective adsorption of cationic dyes and removal of ciprofloxacin antibiotic by surface modified nickel sulfide nanomaterials: Kinetics, isotherm and adsorption mechanism

Kumari, Suman; Khan, Afaq Ahmad; Chowdhury, Arif; Bhakta, Arvind K.; Mekhalif, Zineb; Hussain, Sahid

doi:10.1016/j.colsurfa.2019.124264

Cited by 146 publications

(38 citation statements)

References 67 publications

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“…In the basic medium, OH − reacts with H + to form •OH − , which stimulates the degradation process [ 69 , 70 ]. In addition, at lower pH, the surface of the photocatalyst is positively charged; therefore, adsorption of cationic dyes will be low due to repulsive forces hence the reduction of degradation efficiency in the acidic medium [ 71 , 72 ]. On the other hand, there was a drastic decrease in rhodamine B degradation in the basic medium from 26.5%, 52.9%, and 81.1% for CuS 1 , CuS 2, and CuS 3 to 15.4%, 22.2%, and 23.6%.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Ajibade

Oluwalana

2021

Nanomaterials

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We report the effect of thermolysis time on the morphological and optical properties of CuS nanoparticles prepared from Cu(II) dithiocarbamate single-source precursor. The as-prepared copper sulfide nanoparticles were used as photocatalysts for the degradation of crystal violet (CV), methylene blue (MB), rhodamine B (RhB), and a ternary mixture of the three dyes (CV/MB/RhB). Powder XRD patterns confirmed the hexagonal covellite phase for the CuS nanoparticles. At the same time, HRTEM images revealed mixed shapes with a particle size of 31.47 nm for CuS1 prepared at 30 min while CuS2 prepared at 1 h consists of mixtures of hexagonal and nanorods shaped particles with an average size of 21.59 nm. Mixed hexagonal and spherically shaped particles with a size of 17.77 nm were obtained for CuS3 prepared at 2 h. The optical bandgaps of the nanoparticles are 3.00 eV for CuS1, 3.26 eV for CuS2 and 3.13 eV for CuS3. The photocatalytic degradation efficiency showed that CuS3 with the smallest particle size is the most efficient photocatalyst and degraded 85% of CV, 100% of MB, and 81% of RhB. The as-prepared CuS showed good stability and recyclability and also degraded ternary dyes mixture (CV/MB/RhB) effectively. The byproducts of the dye degradation were evaluated using ESI-mass spectrometry.

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Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Ajibade

Oluwalana

2021

Nanomaterials

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“… 2 , 40 Generally, researchers apply a number of kinetics models to determine the sorption mechanism, and the most common kinetics models are pseudo-first-order and pseudo-second-order models. 41 − 46 The mathematical forms of these models are given below in eqs 1 and 2 , and graphical forms are illustrated in Figure 8 . where k 1 (min –1 ) and k 2 (g/mg.min) are the pseudo-first and pseudo-second-order rate constants, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effective Adsorptive Removal of Methylene Blue from Water by Didodecyldimethylammonium Bromide-Modified Brown Clay

et al. 2020

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In the present investigation, brown clay (BC) was modified with didodecyldimethylammonium bromide (DDAB) to produce a sorbent (DDAB-BC), which was characterized and applied for sorption of methylene blue (MB) from aqueous media. BC was functionalized using DDAB by cation exchange of the DDAB moiety with positive ions existing inside the interlayer spaces of the BC. X-ray diffraction (XRD) studies confirmed that the d -spacing of DDAB-BC became wider (3.39 Å) than that of BC (3.33 Å). Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were exploited to explore the functional groups and morphological structure of sorbents, respectively. The Brunauer–Emmett–Teller (BET) surface area, pore volume, and pore diameter of DDAB-BC were determined as 124.6841 m 2 /g, 0.316780 cm 3 /g, and 8.75102 nm, respectively. Batch sorption investigations were carried out to determine the optimum experimental conditions, using the one-factor one-time procedure. The sorption of MB on DDAB-BC strongly obeyed the Langmuir isotherm and agreed well with pseudo-second-order kinetics. Sorption of MB onto DDAB-BC showed maximum efficiency (∼98%) and maximum sorption capacity (∼164 mg/g) at optimal values of pertinent factors: dye concentration (100 mg/L), pH (7), and temperature (55 °C). Sorption isothermal studies predicted that removal of MB on DDAB-BC follows multilayer sorption at higher MB dye concentrations and monolayer sorption at lower MB dye concentrations.

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“…The effect of the initial concentration of MB dye was studied at the optimum amounts of adsorbent; 16mg for RD and 14.5mg for MD. at low concentration, the adsorption process attains equilibrium state quicker due to the lower ratio of dye molecules to the adsorption sites [40]. By increasing initial dye concentration, the mass gradient increase which resulted in boosting the adsorption driving force.…”

Section: ) Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Diatomite Chemical Activation for Effective Adsorption of Methylene Blue Dye from Model Textile Wastewater

Ebrahimi¹,

Kumar²

2021

IJESD

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Dye wastewater produced in textile industries is a warning issue that threatens the environment due to discharge into the waterway. This study reviewed the adsorption of Methylene Blue (MB), as a toxic dye, onto diatomite adsorbent. A series of chemical modifications were examined by impregnating diatomite into various acidic and basic solutions to obtain the most active sample with the highest capacity. Both raw diatomite (RD) and modified diatomite (MD) were analyzed under different experimental conditions, such as PH, contact time, the dose of adsorbent to attain the optimum quantities of each in which adsorption capacity and removal percentage were in their highest amount. FESEM analysis indicated the surface characterization and the morphology of both adsorbents. The results of batch experiments showed that the equilibration removal capacities of MB under the optimum condition were 72 mg/g for RD and 127 mg/g for MD. Overall results suggested that due to the low-cost, naturally available, simple treatment methods and materials, and sustainability, the modified adsorbent has the potential for dye removal in the practical process.

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Efficient and highly selective adsorption of cationic dyes and removal of ciprofloxacin antibiotic by surface modified nickel sulfide nanomaterials: Kinetics, isotherm and adsorption mechanism

Cited by 146 publications

References 67 publications

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles

Effective Adsorptive Removal of Methylene Blue from Water by Didodecyldimethylammonium Bromide-Modified Brown Clay

Diatomite Chemical Activation for Effective Adsorption of Methylene Blue Dye from Model Textile Wastewater

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