Nanoalginate based biosorbent for the removal of lead ions from aqueous solutions: Equilibrium and kinetic studies

Geetha, P.; Latha, M. S.; Pillai, Saumya S.; Koshy, M M

doi:10.1016/j.ecoenv.2015.06.032

Cited by 34 publications

(8 citation statements)

References 34 publications

(30 reference statements)

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“…For CA-GPP, the data were better fitted by the Freundlich isotherm; signifying a heterogenous adsorption. This was consistent with results obtained in [3], [33], [34] and [35]. This can be traced to the effect of the modifying agent (citric acid) which brought in additional surface sites.…”

Section: Adsorption Isothermssupporting

confidence: 81%

Adsorption Studies of Pb2+ From Aqueous Solutions Using Unmodified and Citric Acid – Modified Plantain (Musa paradisiaca) Peels

Aderibigbe¹,

O.U²,

Oluwasina³

et al. 2017

IOSR JAC

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Section: Adsorption Isothermssupporting

confidence: 81%

Adsorption Studies of Pb2+ From Aqueous Solutions Using Unmodified and Citric Acid – Modified Plantain (Musa paradisiaca) Peels

Aderibigbe¹,

O.U²,

Oluwasina³

et al. 2017

IOSR JAC

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“…The experimental equilibrium and kinetic data for sorption of Cd 2+ ions onto dried biosorbent were modelled using the equilibrium and kinetic models described in sections of sorption isotherm and kinetic models [20][21][22]. Different model fitting parameters were employed to compare experimental Water 2020, 12, 264 5 of 19 results to model-based results.…”

Section: Discussionmentioning

confidence: 99%

Batch Study of Cadmium Biosorption by Carbon Dioxide Enriched Aphanothece sp. Dried Biomass

Satya

Harimawan

Haryani

et al. 2020

Water

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The conventional method for cadmium removal in aqueous solutions (1–100 mg/L) is ineffective and inefficient. Therefore, a batch biosorption reactor using a local freshwater microalga (originating from an urban lake, namely, Situ Rawa Kalong-Depok) as dried biosorbent was tested. Biosorbent made from three kinds of cyanobacterium Aphanothece sp. cultivars (A0, A8, and A15) were used to eliminate cadmium (Cd2+) ions in aqueous solution (1–7 mg/L). The biosorbents were harvested from a photobioreactor system enriched with carbon dioxide gas of 0.04% (atmospheric), 8%, and 15% under continuous light illumination of about 5700–6000 lux for 14 d of cultivation. Produced dried biosorbents had Brunauer–Emmet–Teller (BET) surface area ranges of 0.571–1.846 m2/g. Biosorption of Cd2+ was pH and concentration dependent. Sorption was spontaneous (ΔG = −8.39 to −10.88 kJ/mol), exothermic (ΔH = −41.85 to −49.16 kJ/mol), and decreased randomness (ΔS = −0.102 to −0.126 kJ/mol. K) on the interface between solid and liquid phases when the process was completed. The kinetic sorption data fitted best to the pseudo-second-order model (k2 = 2.79 × 10−2, 3.96 × 10−2, and 4.54 × 10−2 g/mg.min). The dried biosorbents of A0, A8, and A15, after modeling with the Langmuir and Dubinin–Radushkevich isotherm models, indicated that cadmium binding occurred through chemisorption (qmax, D-R = 9.74 × 10−4, 4.79 × 10−3, and 9.12 × 10−3 mol/g and mean free energy of 8.45, 11.18, and 11.18 kJ/mol) on the monolayer and homogenous surface (qmax, Langmuir of 12.24, 36.90, and 60.24 mg/g). In addition, the results of SEM, EDX, and FTIR showed that there were at least nine functional groups that interacted with Cd2+ (led to bond formation) after biosorption through cation exchange mechanisms, and morphologically the surfaces changed after biosorption. Biosorbent A15 indicated the best resilient features over three cycles of sorption–desorption using 1 M HCl as the desorbing eluent. These biosorbents can be a potent and eco-friendly material for treating aqueous wastewater.

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“…This homogenized mixture was sonicated for 5 min. Nanoparticles were collected by centrifugation at 3500 rpm for 5 min, washed and dried under vacuum [12]. The ratio of alginate to chitosan was optimized on the basis of their effect on drug entrapment efficiency.…”

Section: Methodsmentioning

confidence: 99%

Alginate/Chitosan Nanoparticles for Improved Oral Delivery of Rifampicin: Optimization, Characterization and in vitro Evaluation

Thomas¹,

Latha²,

Thomas³

2018

Asian J. Chem.

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Alginate/chitosan nanoparticles were synthesized by ionotropic method using natural honey as the stabilizing agent. The nanoparticles were characterized and the potential of these nanoparticles for the controlled oral delivery of antitubercular drug rifampicin was evaluated in terms of entrapment efficiency, swelling behaviour and in vitro release of the drug. Carboxyl content and in vitro cytotoxicity of the nanoparticles were also evaluated. The swelling and in vitro drug release indicates that the system undergoes pH-dependent swelling and release of drug. Drug release was very low in acidic pH and a maximum of only 20 % of the drug was released in 5 h. A sustained release of drug was observed at pH 7.4 and complete release was obtained in 8 h. Kinetics of the drug release was analyzed by fitting the experimental data into Korsmeyer-Peppas equation and show that the mechanism involved in the release was non-Fickian, controlled by a combined mechanism of diffusion and polymer relaxation. This study shows that the obtained nanoparticles can be a potential carrier for the pH controlled oral delivery of rifampicin.

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Nanoalginate based biosorbent for the removal of lead ions from aqueous solutions: Equilibrium and kinetic studies

Cited by 34 publications

References 34 publications

Adsorption Studies of Pb2+ From Aqueous Solutions Using Unmodified and Citric Acid – Modified Plantain (Musa paradisiaca) Peels

Adsorption Studies of Pb2+ From Aqueous Solutions Using Unmodified and Citric Acid – Modified Plantain (Musa paradisiaca) Peels

Batch Study of Cadmium Biosorption by Carbon Dioxide Enriched Aphanothece sp. Dried Biomass

Alginate/Chitosan Nanoparticles for Improved Oral Delivery of Rifampicin: Optimization, Characterization and in vitro Evaluation

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