Comparative adsorptive and kinetic study on the removal of Malachite Green in aqueous solution using titanium coated graphite and titanium coated graphite with CNT-ABS nanocomposite

Jinendra, Usha; Nagabhushana, B.M.; Bilehal, Dinesh

doi:10.5004/dwt.2021.26536

Cited by 6 publications

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“…Fairly similar observations were reported by Ref. 2 , 48 . Our results were in agreement with the previous study by Ref.…”

Section: Resultssupporting

confidence: 92%

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Preparation and characterization of low-cost adsorbents for the efficient removal of malachite green using response surface modeling and reusability studies

Moustafa

2023

Sci Rep

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Malachite green used in textile and dyeing industries is a common persistent pollutant in wastewater and the environment causing major hazards to human health and aquatic organisms. In this study, the response surface methodology was applied to optimize the adsorptive removal of malachite green using nano-bentonite, MgO-impregnated clay, and Mucor sp. composites. The nano materials and Mucor sp. composite were characterized by FTIR, SEM and X-ray diffractometry. According to the obtained results, nano-bentonite exhibits a maximum MG adsorption efficiency of 98.6% at 35 °C, pH 7.0, 60 min contact time, 1.0 g/L adsorbent dosage, and 50 mg/L initial MG concentration. On the other hand, the maximum efficiency for MG adsorption on MgO-impregnated clay of 97.04% is observed at pH 9.0, 60 min contact time, 0.7 g/L adsorbent dosage, and 50 mg/L initial MG concentration. The Malachite green (MG) adsorption isotherm on MgO-impregnated clay corresponded with the Freundlich isotherm, with a correlation coefficient (R2) of 0.982. However, the Langmuir adsorption isotherm was a superior fit for nano-bentonite (R2 = 0.992). The adsorption activities of nano-bentonite and MgO-impregnated clay were fitted into a pseudo-second-order kinetic model with R2 of 0.996 and 0.995, respectively. Additionally, despite being recycled numerous times, the adsorbent maintained its high structural stability and removal effectiveness for nano-bentonite (94.5–86%) and MgO-impregnated clay (92–83%).

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“…Fairly similar observations were reported by Ref. 2 , 48 . Our results were in agreement with the previous study by Ref.…”

Section: Resultssupporting

confidence: 92%

“…Our findings paralleled those of Ref. 48 , who discovered that the removal of MG dye by titanium coated graphite was lowest at pH 3.0 (56.2%) and highest at pH 7 (95%). Our results are consistent with those reported in Ref.…”

Section: Resultssupporting

confidence: 91%

Preparation and characterization of low-cost adsorbents for the efficient removal of malachite green using response surface modeling and reusability studies

Moustafa

2023

Sci Rep

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“…This trend can probably be explained considering that the lower the initial concentration of MG, the larger the proportion of initially vacant (available) active sites on the surface of the adsorbent. Fairly similar observations were reported by Jinendra et al [54] and Puchongkawarin et al [1]. Our results were in agreement with the previous study by Tarekegn and Balakrishnan [3], which found that the iron impregnated clay's ability to remove MB dye from 98.86% to 76.80% at doses of 20-80 mg/L, respectively.…”

Section: Influence Of the Initial Mg Concentration On Dye Adsorptionsupporting

confidence: 93%

“…Similar conclusions were reached by Dehmani [19], who attributed the increase in adsorption observed as the pH 8 (94%) increased to a reduction in the competition for functional groups between the cations methylene blue and natural clay protons present in solution. Our findings paralleled those of Jinendra et al [54], who discovered that the removal of MG dye by titanium coated graphite was lowest at pH 3.0 (56.2%) and highest at pH 7 (95%).…”

Section: Influence Of Ph On Mg Adsorptionsupporting

confidence: 91%

Optimization study of the adsorption of malachite green removal by MgO nano-composite, nano-bentonite and fungal immobilization on active carbon using response surface methodology and kinetic study

Hamad

2023

Environ Sci Eur

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Malachite green a typical organic dye containing triarylmethane, is discharged in wastewater by textile and leather manufacturing plants. MG can pollute the environment, and it represents a major hazard to humans and various living organisms. We have thus worked toward developing the optimum dye-absorptive material, which should possess the following characteristics: excellent adsorption capacity, good selectivity, favorable recycling and reuse potential, and ease and quickness of adsorption. In this study, nano-bentonite, novel hybrid MgO-impregnated clay, and fungal composites were synthesized for Malachite green removal from aqueous solution. Response surface methodology (RSM) was used for the optimization of the synthesis of adsorbents to achieve simultaneous maximum malachite green removal. The composites were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). According to the obtained results, MgO-impregnated clay exhibits a exhibited a higher adsorption capacity of MG than nano-bentonite and pure bentonite. The malachite green adsorption isotherm on MgO-impregnated clay corresponded with the Freundlich isotherm. However, the Langmuir adsorption isotherm was a superior fit for nano-bentonite. The adsorption activities of nano-bentonite and MgO-impregnated clay were fitted into a pseudo-second-order kinetic model. Based on the root-mean-square error, bias, and accuracy, statistical research has shown that the Halden model has optimal accuracy. In addition, despite being recycled numerous times, the adsorbent maintained its high structural stability and removal effectiveness for nano-bentonite (94.5–86%) and MgO-impregnated clay (92–83%).

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“…Hence, the results did not demonstrate distinct advantage of ultrasonication in term of R%, therefore, the untreated fresh graphite was selected as the effective adsorbent for aniline removal in the subsequent optimisation studies. The results also revealed the R% of graphite was the highest at acidic condition (pH 4) for two wavelengths (230 nm and 280 nm) as the point of zero charge for graphite was pH 6 [12] and leads to the protonation of aniline to anilinium ions. The surface of graphite will be positively charged when the pH was below 6 and the anilinium ions displayed high affinity to graphite, removed from the solution by adsorbing on the surface of graphite [13].…”

Section: Resultsmentioning

confidence: 85%

Optimization of aniline removal using graphite assisted by response surface methodology and box-behnken design

Tan

Wong

Yeap

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The effectiveness of graphite as adsorbent in the removal of aniline by adsorption was investigated in batch mode based on four manipulated variables: pH of aniline solution (3, 7, 11), temperature of the incubator shaker (30°C, 40°C, 50°C), initial aniline concentration (5 ppm, 15 ppm, 25 ppm) and graphite dosage (0.5 g, 1.5 g, 2.5 g). The four manipulated variables were studied systematically through responses surface methodology (RSM) with 4-level of Box-Behnken design. A total number of 27 sets of designs with 3 centre points were created. The peak wavelengths of aniline working samples were measured at 230 nm and 280 nm using spectrophotometric method. Optimal condition of aniline adsorption revealed 15 ppm of aniline concentration with pH 3 at temperature 40°C using 1.5 g of graphite. The surface morphologies and atomic percentage of fresh and used graphite were examined by FESEM-EDX. Ultimately, graphite is proven to be an alternative in aniline removal, and more importantly, it is accessible easily as they require less processing and are abundant in nature.

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Comparative adsorptive and kinetic study on the removal of Malachite Green in aqueous solution using titanium coated graphite and titanium coated graphite with CNT-ABS nanocomposite

Cited by 6 publications

References 0 publications

Preparation and characterization of low-cost adsorbents for the efficient removal of malachite green using response surface modeling and reusability studies

Preparation and characterization of low-cost adsorbents for the efficient removal of malachite green using response surface modeling and reusability studies

Optimization study of the adsorption of malachite green removal by MgO nano-composite, nano-bentonite and fungal immobilization on active carbon using response surface methodology and kinetic study

Optimization of aniline removal using graphite assisted by response surface methodology and box-behnken design

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