Photocatalytic magnetic separable beads for chromium (VI) reduction

Idris, Ani; Hassan, N.S.; Ismail, Nor Hafiza; Misran, Effaliza; Yusof, Noordin Mohd; Ngomsik, Audrey Flore; Bée, Agnès

doi:10.1016/j.watres.2009.11.026

Cited by 105 publications

(62 citation statements)

References 18 publications

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“…The synthesis method of maghemite (c -Fe 2 O 3 ) was described in Idris et al [44]. Briefly, co-precipitation method (Massart, 1981) was used to synthesize the maghemite.…”

Section: Synthesis Of Maghemite (C-fe 2 O 3 )mentioning

confidence: 99%

Characterization of maghemite (γ-Fe2O3)-loaded poly-l-lactic acid/thermoplastic polyurethane electrospun mats for soft tissue engineering

et al. 2016

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This study proposed a new mixture of three different biocompatible and biodegradable materials for soft tissue which needs elasticity and stretchability as well as stiffness. Five different ratios of poly-L-lactic acid (PLLA)/thermoplastic polyurethane (TPU) blend containing 1 % (w/v) maghemite (c-Fe 2 O 3 ) nanoparticles were electrospun and characterized in terms of morphology, degradation rate, biological compatibility, and mechanical properties for tunable properties. Neat PLLA/TPU samples were used for maghemite effect verification. The existence of three components in the electrospun mats was confirmed by Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. Scanning electron microscopy images illustrated well-fabricated nanofibers with smaller diameter distribution for PLLA. The MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay using human skin fibroblast cell indicates desired proliferation and migrant over the samples. Blood biocompatibility results in terms of clotting time, fibrin formation, and hemolysis were almost in the normal range. Samples' degradation rate was investigated over 24 weeks where the PLLA shows 47.15 % mass change, while 6.7 % of TPU mass changed. High tensile strength and an extremely low elongation at break were determined from the stress-strain curve for PLLA, while TPU exhibits high elasticity. The 50:50 % ratio of 1 % (w/v) maghemite-loaded PLLA/TPU scaffold presents an overall satisfaction.

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“…The synthesis method of maghemite (c -Fe 2 O 3 ) was described in Idris et al [44]. Briefly, co-precipitation method (Massart, 1981) was used to synthesize the maghemite.…”

Section: Synthesis Of Maghemite (C-fe 2 O 3 )mentioning

confidence: 99%

Characterization of maghemite (γ-Fe2O3)-loaded poly-l-lactic acid/thermoplastic polyurethane electrospun mats for soft tissue engineering

et al. 2016

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“…A number of adsorbents were used for Cr (VI) removal including biopolymers, activated carbon, metal oxides, microorganisms, bio-waste products, sewage sludge, and nanomaterialimmobilized beads (Lv et al 2013;Vieira et al 2014;Idris et al 2010;Paul et al 2014;Janaki et al 2014;Liu et al 2010) Nano zero valent iron (nZVI) was found to be the most effective adsorbent for Cr (VI) removal from the aqueous solutions compared to the other adsorbents. In the last 20 years, nZVI has been identified to have a significant potential for environmental applications due to its small particle size, large surface area, and greater density of reactive and adsorptive sites (Mueller et al 2012;Singh et al 2011;Savasaria et al 2015;Esfahani et al 2014).…”

Section: Introductionmentioning

confidence: 99%

A comparative study with biologically and chemically synthesized nZVI: applications in Cr (VI) removal and ecotoxicity assessment using indigenous microorganisms from chromium-contaminated site

Ravikumar

Kumar

Rajeshwari

et al. 2015

Environ Sci Pollut Res

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In the present communication, we report a comparative study of Cr (VI) removal using biologically synthesized nano zero valent iron (BS-nZVI) and chemically synthesized nZVI (CS-nZVI), both immobilized in calcium alginate beads. The parameters like initial Cr (VI) concentration, nZVI concentration, and the contact time for Cr (VI) removal were optimized based on Box-Behnken design (BBD) by response surface modeling at a constant pH 7. Under the optimized conditions (concentration of nZVI = 1000 mg L(-1), contact time = ∼ 80 min, and initial concentration of Cr (VI) = 10 mg L(-1)), the Cr (VI) removal by the immobilized BS-nZVI and CS-nZVI alginate beads was 80.04 and 81.08 %, respectively. The adsorption of Cr (VI) onto the surface of alginate beads was confirmed by scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM-EDX), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) analysis. The applicability of the process using both the sorbents was successfully test medium Cr (VI) spiked environmental water samples. In order to assess the ecotoxic effects of nZVI, the decline in cell viability, generation of intracellular reactive oxygen species (ROS), cell membrane damage, and biouptake was studied at 1000 mg L(-1) concentration, with five indigenous bacterial isolates from chromium-contaminated lake sediments and their consortium.

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“…Previous studies (Idris et al, 2010; have showed that γ-Fe 2 O 3 nanoparticles in PVA-alginate beads have been used as adsorbents to remove Pb(II).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of barium removal from radioactive waste water using the combination of maghemite and titania nanoparticles in PVA and alginate beads

Majidnia

Idris

Majid

et al. 2015

Applied Radiation and Isotopes

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Photocatalytic magnetic separable beads for chromium (VI) reduction

Cited by 105 publications

References 18 publications

Characterization of maghemite (γ-Fe2O3)-loaded poly-l-lactic acid/thermoplastic polyurethane electrospun mats for soft tissue engineering

Characterization of maghemite (γ-Fe2O3)-loaded poly-l-lactic acid/thermoplastic polyurethane electrospun mats for soft tissue engineering

A comparative study with biologically and chemically synthesized nZVI: applications in Cr (VI) removal and ecotoxicity assessment using indigenous microorganisms from chromium-contaminated site

Efficiency of barium removal from radioactive waste water using the combination of maghemite and titania nanoparticles in PVA and alginate beads

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