Biopolymer-based nanosystem for ferric ion removal from water

Bodnár, Magdolna; Hajdu, István; Rőthi, Eszter; Harmati, Nóra; Csikós, Zsuzsanna; Hartmann, John F.; Balogh, Csaba; Kelemen, Béla; Tamás, János; Borbély, János

doi:10.1016/j.seppur.2013.03.043

Cited by 10 publications

(2 citation statements)

References 39 publications

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“…This is used particularly for remediation of acid mine drainage (AMD), which is a significant source of aqueous metal contamination in countries with active or former mining activities . More advanced physicochemical methods of metal‐contaminated water treatment include solvent extraction, ion exchange (by synthetic resins or abundant, naturally occurring zeolites), or adsorption by organic compounds, as well as flocculation, membrane filtration, and electrochemical methods . However, all of these methods tend to be expensive, difficult to scale, and are inefficient in cases where metal concentration is low.…”

Section: Remediation Methodsmentioning

confidence: 99%

Making light work of heavy metal contamination: the potential for coupling bioremediation with bioenergy production

Raikova

Piccini

Surman

et al. 2019

J of Chemical Tech & Biotech

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Intense anthropogenic activity continues to expose the natural environment to heavy metal contamination. Whilst a number of physical and chemical solutions for remediation exist, the use of higher plants and algae for clean‐up of contaminated landscapes, termed ‘phytoremediation’ and ‘phycoremediation’, respectively, offer an attractive and sustainable alternative. However, these remediation processes will always lead to a high‐moisture, heavy metal‐contaminated biomass, which must be further processed to partition, or render inert, the metal contaminants. Conversion of this metal‐rich biomass into second‐generation biofuels offers a useful route to subsidise the economics of remediation activities. Here we briefly review the various methods for bioremediation of heavy metals, and discuss the potential to produce bioenergy from these biomass sources. Coupling the bioremediation activity to bioenergy production gives far‐reaching social and economic benefits; however, established processes such as direct combustion and anaerobic digestion risk releasing heavy metals back into the environment. Alternatively, thermochemical conversions such as pyrolysis or hydrothermal liquefaction (HTL) offer significant advantages in terms of the segregation of metals into a relatively inert and compact solid phase while producing a biocrude oil for bioenergy production. In addition, preliminary work suggests that the HTL process can also be used to partition essential macronutrients, such as N, P and K, into an aqueous medium, allowing additional nutrient recycling. © 2019 Society of Chemical Industry

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Section: Remediation Methodsmentioning

confidence: 99%

Making light work of heavy metal contamination: the potential for coupling bioremediation with bioenergy production

Raikova

Piccini

Surman

et al. 2019

J of Chemical Tech & Biotech

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“…It has been widely used in medicine, cosmetics, food, agriculture, and water treatment [ 14 ]. Previous studies reported that the carboxyl and amide groups of γ-PGA can complex with various metal ions, including Cu(II), Pb(II), Hg(II), Ni(II), Mn(II), Cd(II), Fe(III), Al(III), Cr(III), and U(VI) [ 15 , 16 , 17 ]. Some researchers have synthesized apatite by wet chemical method in the presence of amino acid and polypeptide, including aspartic acid, glutamic acid poly-L-aspartate, and γ-PGA, to introduce carboxylic groups onto the apatite surface [ 12 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cu(II) by Poly-γ-glutamate/Apatite Nanoparticles

Chen

Zeng

2021

Polymers

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Poly-γ-glutamate/apatite (PGA-AP) nanoparticles were prepared by chemical coprecipitation method in the presence of various concentrations of poly-γ-glutamate (γ-PGA). Powder X-ray diffraction pattern and energy-dispersive spectroscopy revealed that the main crystal phase of PGA-AP was hydroxyapatite. The immobilization of γ-PGA on PGA-AP was confirmed by Fourier transform infrared spectroscopy and the relative amount of γ-PGA incorporation into PGA-AP was determined by thermal gravimetric analysis. Dynamic light scattering measurements indicated that the particle size of PGA-AP nanoparticles increased remarkably with the decrease of γ-PGA content. The adsorption of aqueous Cu(II) onto the PGA-AP nanoparticles was investigated in batch experiments with varying contact time, solution pH and temperature. Results illustrated that the adsorption of Cu(II) was very rapid during the initial adsorption period. The adsorption capacity of PGA-AP nanoparticles for Cu(II) was increased with the increase in the γ-PGA content, solution pH and temperature. At a pH of 6 and 60 °C, a higher equilibrium adsorption capacity of about 74.80 mg/g was obtained. The kinetic studies indicated that Cu(II) adsorption onto PGA-AP nanoparticles obeyed well the pseudo-second order model. The Langmuir isotherm model was fitted well to the adsorption equilibrium data. The results indicated that the adsorption behavior of PGA-AP nanoparticles for Cu(II) was mainly a monolayer chemical adsorption process. The maximum adsorption capacity of PGA-AP nanoparticles was estimated to be 78.99 mg/g.

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