Batch and continuous studies on the removal of heavy metals from aqueous solution using biosynthesised melanin-coated PVDF membranes

Manirethan, Vishnu; Gupta, N.K.; Balakrishnan, Raj Mohan; Raval, Keyur

doi:10.1007/s11356-019-06310-8

Cited by 44 publications

(28 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An upward behavior of the Cr (VI) removal percentage was found concerning temperature increase, suggesting that the process is endothermic [38]; this could be due to the temperature-proportional increase of the collision frequency between the adsorbent and the metal ions, which reach more kinetic energy to diffuse from the solution phase to the solid phase of the adsorbent [39], so at higher temperatures, some of the components on the surface can dissociate leading to the generation of more active sites to which the heavy metal can bond [40][41]. The behavior shown by the adsorption efficiency with regard to the adsorbent dose is due to the increase of the residence time of the solution inside the column, so Cr (VI) has more time to diffuse into the solid phase, dominating over the axial dispersion, which at low bed heights predominates in the mass transfer and reduces the diffusion of metallic ions [42][43][44].…”

Section: B Effect Of Bed Height and Temperature On Cr (Vi) Adsorptionmentioning

confidence: 99%

Optimization of the Effect of Temperature and Bed Height on Cr (VI) Bioadsorption in Continuous System

et al. 2020

View full text Add to dashboard Cite

In the present paper, the residues of the plantain starch extraction process are proposed as an adsorbent to remove Cr (VI) in a continuous fixed bed-system, varying the temperature in 33, 40, 55, 70 y 76 °C and bed height in the range of 15.5, 30, 65, 100, 114.5 mm. The adsorbent material was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-ray Diffraction Analysis (XRD). The Cr (VI) solution at 100 ppm had contact with the column by gravity, with a flow rate of 0.75 mL/s at the different working conditions. At the end of the process, the residual concentration of the metal was measured by UV-Vis spectroscopy using the standard method for the determination of Cr (VI) in water ASTM D1687-17. From the results, it was established that the bioadsorbent has the presence of hydroxyl, carboxyl and methyl functional groups and that the adsorption process is controlled by electrostatic interactions; the variables evaluated had a significant influence on the process because applying the RSM methodology it was observed that the optimal operating conditions are 81.49 mm of bed height and temperature of 68 ºC. Based on the behavior of the rupture curve, it was found that the bio-material has the potential to be used as a filler in an adsorption column with the purpose of remove Cr (VI).

show abstract

Section: B Effect Of Bed Height and Temperature On Cr (Vi) Adsorptionmentioning

confidence: 99%

Optimization of the Effect of Temperature and Bed Height on Cr (VI) Bioadsorption in Continuous System

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Fig. 3 shows the IR spectrum of the PP before and after the Cr (VI) and Ni (II) removal process, and shows the representative peaks corresponding to the vibration and stretching of the OH, C-H, C=O, COOH groups [31], [32]. From the spectrum of Fig.…”

Section: A Adsorbent Characterizationmentioning

confidence: 99%

Breakthrough and thermodynamic adsorption of Cr (VI) y Ni (II) bioadsorption in continuous system

Tovar¹,

López²,

Lara³

2021

Sci. tech

View full text Add to dashboard Cite

The removal of heavy metals present in water is an issue of environmental interest, due to bioaccumulation, biomagnification and the carcinogenic and mutagenic effects on living beings. The objective of the present study was to use plantain peel residues in Chromium (VI) and Nickel (II) removal in continuous system, evaluating the effect of bedheight, temperature and adsorbent particle size on the process; obtaining a 98.7% 99.71% removal yield for Cr (VI) and Ni(II), respectively. The FTIR showed that the bioadsorbent has a heterogeneous structure with the presence of hydroxyl groups, saturated and unsaturated hydrocarbons, carbonyls, carboxyl, among others, and it was established that the process is controlled by electrostatic reactions between the active centers and the metal. The breaka ge curve was carried out under the optimal conditions established by the Response Surface Methodology (RSM) and it was established that the bioadsorbent has an extensive useful life, as it was not saturated throughout the process. The hermodynamic parameters established that the process is exothermic and irreversible, being favored at room temperature. Taking into account the behavior of plantain peels during the breakage curve, it is recommended to use it as a filler in a packed bed to remove Cr (VI) and Ni (II).

show abstract

“…Nickel is not biodegradable and is particularly harmful to humans and other organisms, even in minimal concentrations; it can cause dermatitis, long-term exposure to high doses of nickel can lead to kidney and lung damage, pulmonary fibrosis, gastrointestinal failure, renal oedema, gastrointestinal disorder, cancer and teratogenicity [4]. Besides, nickel carbonyl that is easily absorbed into the skin has been reported to be lethal in humans at atmospheric exposure of 30 mg/L per 30 min [5]. The US-EPA established a maximum concentration of 0.5 mg/L of nickel in drinking water [6]; therefore, the treatment of effluents contaminated with this metal is a priority.…”

Section: Introductionmentioning

confidence: 99%

Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

Tovar

Villabona-Ortíz

Cortina-Góngora

et al. 2021

Rev.Fac.Ing.Univ.Antioquia

View full text Add to dashboard Cite

The presence of heavy metals in aqueous media represents a severe threat to ecosystems because they are non-biodegradable, toxic, and carcinogenic. In the present work, the utilization of agro-industrial residues from obtaining plantain starch for removing Ni (II) was studied, establishing the effect of temperature, adsorption dose, and initial concentration. The kinetics, equilibrium, and thermodynamic parameters that determine the process were studied. For this purpose, tests were carried out in a batch system maintaining constant stirring (200 rpm), pH (2), and solution volume (100 mL). The remaining metal concentration was determined by atomic adsorption at 237 nm. It was found that the best adsorption conditions were given at 55 ºC, 0.6775 g, and 368 mg/L obtaining a maximum adsorption capacity of 47.57 mg/g corresponding to a removal of 87%. The kinetic model that best fits the experimental data was a pseudo-second-order model, and the isotherm that describes the process is Langmuir and Freundlich, so the adsorption is given by chemisorption and multilayers. The thermodynamic parameters determined suggest that the process is favourable, not spontaneous, endothermic, and irreversible under the studied conditions. The results show that the residual biomass from the obtaining of plantain starch is a good precursor for absorbing Ni (II) in an aqueous solution.

show abstract

Batch and continuous studies on the removal of heavy metals from aqueous solution using biosynthesised melanin-coated PVDF membranes

Cited by 44 publications

References 39 publications

Optimization of the Effect of Temperature and Bed Height on Cr (VI) Bioadsorption in Continuous System

Optimization of the Effect of Temperature and Bed Height on Cr (VI) Bioadsorption in Continuous System

Breakthrough and thermodynamic adsorption of Cr (VI) y Ni (II) bioadsorption in continuous system

Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

Contact Info

Product

Resources

About