Equilibrium, kinetics and thermodynamics of hexavalent chromium biosorption on pristine and zinc chloride activated <i>Senna siamea</i> seed pods

Ajmani, Abhishek; Shahnaz, Tasrin; Narayanan, S. Lakshmi; Narayanasamy, Selvaraju

doi:10.1080/02757540.2019.1584614

Cited by 48 publications

(22 citation statements)

References 29 publications

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“…Higher chromium adsorption percentage with the increase in the adsorbent dose can be attributed to increasing in surface area and the availability of more binding sites for adsorption (Karthik et al 2018;Rao et al 2002;Reddy et al 2014;Umoren et al 2013). The decrease in uptake of Cr in mg/g with increased adsorbent dose may be due to the unchanged initial concentration of metal ion and the substantial adsorption capacity of the smallest adsorbent dose or less availability of surface area per unit weight (Ajmani et al 2019a). Similar trends have also been reported by other authors relating to the effect of adsorbent doses on adsorption efficiency of Cr (Garg et al 2007;Ghorbani et al 2008).…”

Section: Effect Of Adsorbent Dosesupporting

confidence: 83%

Removal of chromium from synthetic wastewater by adsorption onto Ethiopian low-cost Odaracha adsorbent

2020

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Nowadays, Cr-loaded wastewater released from industrial activities pose an increasing risk to human health and the environment. Adsorption processes have been widely used for the removal of chromium from the waste stream. In this regard, natural adsorbents are the most preferable and cost-effective methods. In this study, the efficiency of Odaracha adsorbent as a novel green technology in the removal of chromium from synthetic wastewater is analyzed. Batch adsorption experiments were conducted to evaluate the effect of contact time, pH, adsorbent dose, and initial concentration of adsorbate on Cr removal. The surface morphology of Odaracha adsorbent was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray powder diffraction. Experimental results showed that Odaracha adsorbent could perform effectively in a wide range of experimental conditions. However, in optimum experimental conditions, such as 180-min contact time, pH 3, and 15 g/L of adsorbent dose Odaracha adsorbent removes 94.68% of Cr from an aqueous solution having 110 mg/L of Cr concentration.

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Section: Effect Of Adsorbent Dosesupporting

confidence: 83%

Removal of chromium from synthetic wastewater by adsorption onto Ethiopian low-cost Odaracha adsorbent

2020

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“…Finally, the un-adsorbed concentrations of Cr +6 metal ions were measured by making complex with a fixed amount of DPC. Solutions were made up with H 2 SO 4 (0.1M) up to the mark [3]. The results were analyzed by Visible spectrophotometer at 540 nm.…”

Section: Biosorption Proceduresmentioning

confidence: 99%

“…The obtained spectrum results showed the presence of Cr +6 metal ions in treated sample which indicates the successful adsorption of Cr +6 metal ions. However, presence of the other small metal ions impurities may have arisen due to the number of other plant constituents [3].…”

Section: Characterizationmentioning

confidence: 99%

Biosorption of hexavalent chromium metal ions from an aqueous solution of leaves and bark of Cinnamomum verum via green route

et al. 2020

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In present research work Cinnamomum verum leaves (CL) and barks (CB) are exploited to encounter their effectiveness against the concentration of hexavalent chromium (Cr +6 metal ions) through biosorption process. To achieve this goal optimal conditions were set and broken into various parts such as; doses of adsorbents, concentrations of adsorbates, variations in contact and stirring time (5-100 min), temperatures (10 °C to 50 °C) and pHs from acidic to basic range (1 to 12). Thermodynamic parameters were also applied to validate the assay, which shows that the process is endothermic with positive ∆H° values, while negative values of ∆G° proved the spontaneous nature of sorption. Moreover, Lagergren's kinetic equations were employed, which suggest that the observed reaction process followed the dynamics of pseudosecond order. Equilibrium adsorption isotherms namely Langmuir and Freundlich have been applied to study the adsorbate materials attraction towards Cr +6 metal ions. The determined adsorption capability, i.e. q e was found to be 11.33 and 26.85 mg/g acquired by CL and CB at 30 °C and 40 °C, respectively. FT-IR spectrums of loaded and unloaded metal ions were taken, which confirmed the participated functional groups of herbal plants in biosorption process. EDX analysis revealed the presence of Cr +6 metal ions after biosorption process. Furthermore, irregularities on surface of adsorbent material obtained from SEM images have provided more support to results for validation.

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“…It is generally found as trivalent and hexavalent states in aqueous environments [1,5]. More specifically, Cr(III) is relatively non-toxic and required in micro quantities in human food [6]. Under certain conditions, Cr(III) can be oxidized to more carcinogen and mutagen Cr(VI) in the environment [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, biosorption has become one of the alternative methods that has been widely applied for detoxification of heavy metals [1,2]. It has many advantages over conventional methods such as low cost, easy operating system, high removal efficiency, removal of metal ions at low concentrations, high metal binding ability, low biological sludge formation, eco-friendly, recycling of biosorbents, and high recovery of metal ions from metal-loaded biosorbents [2,6,8].…”

Section: Introductionmentioning

confidence: 99%

Calcium alginate entrapped Eupatorium adenophorum Sprengel stems powder for chromium(VI) biosorption in aqueous mediums

Aryal

2019

PLoS ONE

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A novel biosorbent, Eupatorium adenophorum Sprengel-alginate beads was used for chromium(VI) biosorption from aqueous solutions. Biosorption process was optimized at pH 2.0, biomass concentration 1.0 g/L, contact time 60 min, and temperature 30 o C respectively. Maximum uptake capacity of Cr(VI) was calculated at 28.011 mg/g. It was found that the overall biosorption process was best described by pseudo second-order kinetics with high correlation coefficient values. Intraparticle diffusion model suggested that Cr(VI) biosorption may proceed within multiple steps. Data obtained from the batch studies confirmed well to the Langmuir, Temkin, and Hill-der Boer isotherm models. Scatchard plot analysis further supported the mono-layer biosorption of Cr(VI) ions on Eupatorium adenophorum Sprengel-alginate beads as described by Langmuir isotherm model. Numerical values of E obtained from Dubinin-Radushkevich isotherm model identified the physisorption as predominant mechanism for Cr(VI) biosorption. The negative values of Δ G o confirmed the spontaneous and feasibility nature, whereas positive value of Δ H o showed the endothermic nature of biosorption process. Positive value of Δ S o indicated an increase in the randomness at the solid/solution interface during the biosorption process. The endothermic nature of Cr(VI) biosorption was also described by Temkin isotherm model. The results indicated that Cr(VI) biosorption was not significantly affected by the presence of co-ions at lower concentrations. Desorption of Cr(VI) ions from metal-loaded Eupatorium adenophorum -alginate beads was observed at 92.091% with 0.5 M HNO 3 solution in solid to liquid ratio of 1.0 g/L.

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Equilibrium, kinetics and thermodynamics of hexavalent chromium biosorption on pristine and zinc chloride activated Senna siamea seed pods

Cited by 48 publications

References 29 publications

Removal of chromium from synthetic wastewater by adsorption onto Ethiopian low-cost Odaracha adsorbent

Removal of chromium from synthetic wastewater by adsorption onto Ethiopian low-cost Odaracha adsorbent

Biosorption of hexavalent chromium metal ions from an aqueous solution of leaves and bark of Cinnamomum verum via green route

Calcium alginate entrapped Eupatorium adenophorum Sprengel stems powder for chromium(VI) biosorption in aqueous mediums

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