Chemical modification of chitin with polypyrrole for the uptake of Pb(II) and Cd(II) ions

Rathinam, K.; Meenakshi, Sankaran

doi:10.1016/j.ijbiomac.2015.03.041

Cited by 72 publications

(32 citation statements)

References 24 publications

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“…The obtained dependencies seem to be consistent with other studies that determined the effect of pH on sorption of hazardous metals onto different biomaterials (chitin‐polypirrole, chitin‐cellulose bead, xanthated banana nanocellulose, Cladonia rangiformis ). These observations may support the hypothesis regarding hydrolysis reactions of metal salts and the reaction between the binding sites of the sorbent and the metal ion.…”

Section: Resultssupporting

confidence: 90%

Adhesive Stalks of DiatomDidymosphenia geminataas a Novel Biological Adsorbent for Hazardous Metals Removal

Wysokowski

Bartczak

Żółtowska-Aksamitowska

et al. 2017

CLEAN Soil Air Water

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The application of biomass derived from the nuisance fresh‐water diatom species Didymosphenia geminata toward the adsorption and removal of heavy‐metal ions from water is reported. The cell‐free polysaccharide‐based stalks of these diatoms are used as adsorbents to remove harmful metal ions: Pb(II), Ni(II), and Cd(II). Detailed analyses of the adsorption kinetics using both pseudo‐first‐order model and pseudo‐second‐order models are performed. The results show a strong correspondence to a pseudo‐second‐order kinetic model. The Langmuir and Freundlich models are used to describe the adsorption isotherms. The correlation coefficients (r2) of the Langmuir model are equal to 0.994 (Pb2+), 0.995 (Cd2+), and 0.995 (Ni2+), and the r2 for the Freundlich model are equal to 0.991 (Pb2+), 0.991 (Cd2+), and 0.987 (Ni2+). The experimental data for all metal ions strongly support the Langmuir isotherm model. It is shown that stalks of D. geminata exhibit exceptional sorption capacity (qm) for Pb(II) ions of 175.48 mg g−1. Additionally, a high sorption capacity for Cd(II) (145.86 mg g−1), and Ni(II) (130.27 mg g−1) is observed. The thermodynamic aspects of the adsorption process of selected metal ions are also discussed. Preliminary tests investigating applications of D. geminata stalks for sewage purification from galvanic industry and battery and accumulator production were performed. These comprehensive studies show that D. geminata can be robustly applied for the removal of harmful metal ions from wastewater.

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Section: Resultssupporting

confidence: 90%

Adhesive Stalks of DiatomDidymosphenia geminataas a Novel Biological Adsorbent for Hazardous Metals Removal

Wysokowski

Bartczak

Żółtowska-Aksamitowska

et al. 2017

CLEAN Soil Air Water

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“…FTIR spectra of PPy-EPS nancomposite is shown in Figure 3. The broad peak (3400-3100 cm 21 ) was ascribed to O2H stretching vibration of inter-and intramolecular hydrogen bonding of polymeric compounds [25]. The absorption peak at 2934 cm 21 was assigned to C2H stretching vibration of fatty acids and sugars present in the EPS.…”

Section: Resultsmentioning

confidence: 99%

“…Fourier transform infrared spectroscopy (FTIR) spectra of the nanocomposite were obtained on a spectrometer (Shimadzu, Model 8400S) in a diffuse reflectance mode at a resolution of 4 cm 2 1 in KBr pellets. Scanning was done in the range of 400 2 4000 cm 21 . Powder X-ray diffractogram of the nanocomposite was obtained using a Cu Ka incident beam (k 5 0.1546 nm), monochromated by a nickel filtering wave at a tube voltage of 40 kV and tube current of 30 mA.…”

Section: Characterization Of Ppy-eps Nanocompositementioning

confidence: 99%

Adsorption and subsequent detoxification of hexavalent chromium in aqueous solution using polypyrrole‐bacterial extracellular polysaccharide nanocomposite

Rajeswari¹,

Janaki²,

Shanthi³

et al. 2016

Env Prog and Sustain Energy

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The aim of this study was to assess the adsorption and Cr(VI) detoxification potential of polypyrrole-bacterial extracellular polysaccharide (PPy-EPS) nanocomposite. The nanocomposite was synthesized by in situ chemical oxidative polymerization of pyrrole monomer with bacterial extracellular polysaccharide (EPS). Scanning and transmission electron micrographs showed the nanocomposites to be irregular in shape and mostly present in aggregates. Fourier transform infrared analyses illustrate the characteristic peaks (2934, 1548, 1463, and 1165 cm 21 ) of both pyrrole and bacterial extracellular polysaccharides. X-ray diffractogram showed the amorphous nature of the nanocomposite, and the surface area of the PPy-EPS nanocomposite was measured as 26.21 m 2 g 21 . The nanocomposite efficiently reduced more than 80% of Cr(VI) within 30 min. The X-ray diffractogram corresponding to the crystal planes ( (012), (110)) of Cr 2 O 3 further confirmed the reduction of Cr(VI). The results of the study confirm PPy-EPS nanocomposite as suitable option for the treatment of Cr(VI)-bearing industrial wastewaters.

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“…According to the literature [28,29], low pH values are unfavorable for metal ion adsorption, since in that range they are present in solution in free form as M n+ (Cd 2+ , Cu 2+ and Pb 2+ ), hence in this case there is an electrostatic repulsion between the cation and the more positively charged surface of the adsorbent. With increasing pH, the adsorbent surface becomes more negatively charged more OH -groups are generated and this fact allows metal ions, such as Cd(II) , Pb(II), and Cu(II) to be adsorbed more effectively.…”

Section: Sorption Processmentioning

confidence: 99%

Removal of heavy metals Pb(II), Cd(II) and Cu(II) from waste waters using synthesized chromium doped nickel oxide nano particles

Krishna¹,

Sandhya²,

Babu³

2018

Bull. Chem. Soc. Eth.

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ABSTRACT. Adsorption of metal ions Pb(II), Cd(II) and Cu(II) are observed on chromium doped nickel nano metal oxide. Chromium doped nickel oxide was synthesized by combustion technique using glycine as a fuel. In this work, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) are applied to study the composition and structure of chromium doped nickel oxide. Batch equilibrium experiments were performed to study the removal efficiency of heavy metal ions. The effects of different parameters such as contact time, pH and adsorbent dose on the adsorption process were investigated. The adsorption kinetics and adsorption isotherms studies were also performed. The formation of hydroxide on the surface of chromium doped nickel oxide could be the main factor of cations removal due to its high adsorption affinity for aqueous solutes. Chromium doped nickel oxide may offer a potential remediation method for the removal of metals from water and environment.

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Chemical modification of chitin with polypyrrole for the uptake of Pb(II) and Cd(II) ions

Cited by 72 publications

References 24 publications

Adhesive Stalks of DiatomDidymosphenia geminataas a Novel Biological Adsorbent for Hazardous Metals Removal

Adhesive Stalks of DiatomDidymosphenia geminataas a Novel Biological Adsorbent for Hazardous Metals Removal

Adsorption and subsequent detoxification of hexavalent chromium in aqueous solution using polypyrrole‐bacterial extracellular polysaccharide nanocomposite

Removal of heavy metals Pb(II), Cd(II) and Cu(II) from waste waters using synthesized chromium doped nickel oxide nano particles

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