Adsorption of Methylene Blue dye and Cu(II) ions on EDTA-modified bentonite: Isotherm, kinetic and thermodynamic studies

Castro, Maria Leah Flor A. De; Abad, Melody Love B.; Sumalinog, Divine Angela G.; Abarca, Ralf Ruffel M.; Paoprasert, Peerasak; Luna, Mark Daniel G. de

doi:10.1016/j.serj.2018.04.001

Cited by 125 publications

(45 citation statements)

References 34 publications

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“…Bentonite is a natural soil amendment which is very abundant in China, with over 8.0 Pg of proven reserves 26 . At present bentonite is widely used for adsorbing metal ions and dye, disposing radioactive wastes and purifying viral RNA and waste water due to its strong adsorption properties 27 – 30 . Furthermore, its use as a soil amendment may be an effective approach for solving some of the agronomic/environmental problems related to drought stress and soil degradation in agricultural systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of bentonite as a soil amendment on field water-holding capacity, and millet photosynthesis and grain quality

Gregorich

et al. 2020

Sci Rep

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A field experiment was conducted in a semi-arid region in northern China to evaluate the effects of bentonite soil amendment on field water-holding capacity, plant available water, and crop photosynthesis and grain quality parameters for millet [Setaria italic (L.) Beauv.] production over a 5-year period. Treatments included six rates of bentonite amendments (0, 6, 12, 18, 24 and 30 Mg ha−1) applied only once in 2011. The application of bentonite significantly (P < 0.05) increased field water-holding capacity and plant available water in the 0–40 cm layer. Bentonite also significantly (P < 0.05) increased the emergence rate, above-ground dry matter accumulation (AGDM), net photosynthesis rate (Pr), transpiration rate (Tr), soil and plant analysis development (SPAD) and leaf water use efficiency (WUE). It also increased grain quality parameters including grain protein, fat and fiber content. Averaged over all the years, the optimum rate of bentonite was 24 Mg ha−1 for all plant growth and photosynthesis parameters except for grain quality where 18 Mg ha−1 bentonite had the greatest effect. This study suggests that bentonite application in semi-arid regions would have beneficial effects on crop growth and soil water-holding properties.

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Section: Introductionmentioning

confidence: 99%

Effect of bentonite as a soil amendment on field water-holding capacity, and millet photosynthesis and grain quality

Gregorich

et al. 2020

Sci Rep

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“…Zhang et al [15] used modified kaolinite (kaolinite monolayer grafted with 3-aminopropyl triethoxysilane) for removal of Congo red from water. Removal of Methylene blue and Cu(II) has been reported by using EDTA modified bentonite [16].…”

Section: Introductionmentioning

confidence: 99%

Removal of hazardous basic dyes from aqueous solution by adsorption onto kaolinite and acid-treated kaolinite: kinetics, isotherm and mechanistic study

Sarma

Gupta²,

Bhattacharyya

2019

SN Appl. Sci.

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Presence of dye molecules in water causes various harmful effects for both human and aquatic species. Herein, we tried to remove two cationic dyes, namely Crystal violet and Brilliant green, from water by kaolinite clay mineral. The kaolinite clay mineral is further treated with 0.25 M and 0.05 M H 2 SO 4 to increase its adsorption capacity. The structural changes due to acid treatment were analyzed by XRD, zeta potential, FTIR, SEM, cation exchange capacity, BET surface area, and pore volume measurements. Kinetic data were analyzed by using five different kinetic models and the data fitted best to pseudo-second-order model. Langmuir isotherm showed best fit to the adsorption of both Crystal violet and Brilliant green. Acid-treatment has slightly increased the adsorption capacities for both the dyes. The Langmuir monolayer adsorption capacity of raw kaolinite was found to be 47.17 and 25.70 mg g −1 for Crystal violet and Brilliant green, respectively, which increased to 49.50 and 50.51 mg g −1 for 0.25 M and 0.50 M acid-treated kaolinite in case of Crystal violet and to 26.45 and 26.88 mg g −1 in case of Brilliant green at 303 K. Crystal violet adsorption was exothermic with increase in ∆G values, whereas Brilliant green adsorption was endothermic in nature with decrease in ∆G in the temperature range 293-323 K. Reusability study showed the adsorbents could be successfully used up to 3rd cycle without much loss of adsorption capacity.

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“…Further increase in pH can result into metal hydroxide and hydrated oxide formation hence limited metal ion will be available for uptake, this consequently will results in decrease in Cu 2+ removal [Teow et al, 2018]. Some previous reports had optimum adsorption of Cu 2+ at pH 5 and 5.5 [Demiral and Güngor, 2016;De Castro et al, 2018].…”

Section: Operational Parameters Effects On Cu 2+ Adsorption Onto Rhe mentioning

confidence: 98%

Copper scavenging efficiency of adsorbents prepared from Raphia hookeri fruit waste

Inyinbor

Adekola

Olatunji

2019

Sustainable Chemistry and Pharmacy

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Low cost adsorbents prepared from the epicarp of Raphia hookeri fruit were used for the removal of copper (II) ion from aqueous solution. The effects of operational parameters such as pH, concentration and contact time, dosage as well as interference of other ions were studied. Optimum pH for raw and modified biomass were 5.0 and 5.5 with percentage removal of 75.08% and 95.62% respectively. Concentration of competing ions greatly reduced Cu 2+ removal with both adsorbents while agitation speed had negligible effect on Cu 2+ uptake. Adsorbents surfaces were activated as temperature increased thus enhancing adsorbent adsorption capacity at high temperature. Adsorption kinetic data fitted best into the pseudo second order model while the thermodynamics studies confirmed adsorption spontaneity and feasibility. The Freundlich adsorption isotherm best described the adsorption process and the Langmuir maximum monolayer adsorption capacity for the raw (RHE) and acid treated (ARHE) biomass were 81.97 and 103.09 mg/g respectively. Chemisorption predominate the Cu 2+ -ARHE system hence desorption efficiency was obtained to be 72.65% with CH 3 COOH as eluent.

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Adsorption of Methylene Blue dye and Cu(II) ions on EDTA-modified bentonite: Isotherm, kinetic and thermodynamic studies

Cited by 125 publications

References 34 publications

Effect of bentonite as a soil amendment on field water-holding capacity, and millet photosynthesis and grain quality

Effect of bentonite as a soil amendment on field water-holding capacity, and millet photosynthesis and grain quality

Removal of hazardous basic dyes from aqueous solution by adsorption onto kaolinite and acid-treated kaolinite: kinetics, isotherm and mechanistic study

Copper scavenging efficiency of adsorbents prepared from Raphia hookeri fruit waste

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