Removal of heavy metal ions and humic acid from aqueous solutions by co-adsorption onto thermosensitive polymers

Tokuyama, Hideaki; Hisaeda, Junichi; Nii, Susumu; Sakohara, Shuji

doi:10.1016/j.seppur.2009.11.005

Cited by 58 publications

(28 citation statements)

References 20 publications

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“…Machado et al (2010) examined the biosorption of metal ions by yeast cells of Saccharomyces cerevisiae (12 g dry weight L -1 of yeast cells) and found that concentration of nickel in the real effluent (34 lmol/L) reached under the quality criteria for industrial effluent discharge, leading to removal of nickel up to 89 %. Tokuyama et al (2010) developed an enhanced metal separation technique [a model system consisting of metal ions (Cu 2? or Cr 3?…”

Section: Biosorptionmentioning

confidence: 99%

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Mani

Kumar

2013

Int. J. Environ. Sci. Technol.

503

137

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The ability of heavy metals bioaccumulation to cause toxicity in biological systems-human, animals, microorganisms and plants-is an important issue for environmental health and safety. Recent biotechnological approaches for bioremediation include biomineralization (mineral synthesis by living organisms or biomaterials), biosorption (dead microbial and renewable agricultural biomass), phytostabilization (immobilization in plant roots), hyperaccumulation (exceptional metal concentration in plant shoots), dendroremediation (growing trees in polluted soils), biostimulation (stimulating living microbial population), rhizoremediation (plant and microbe), mycoremediation (stimulating living fungi/mycelial ultrafiltration), cyanoremediation (stimulating algal mass for remediation) and genoremediation (stimulating gene for remediation process). The adequate restoration of the environment requires cooperation, integration and assimilation of such biotechnological advances along with traditional and ethical wisdom to unravel the mystery of nature in the emerging field of bioremediation. This review highlights better understanding of the problems associated with the toxicity of heavy metals to the contaminated ecosystems and their viable, sustainable and eco-friendly bioremediation technologies, especially the mechanisms of phytoremediation of heavy metals along with some case studies in India and abroad. However, the challenges (biosafety assessment and genetic pollution) involved in adopting the new initiatives for cleaning-up the heavy metals-contaminated ecosystems from both ecological and greener point of view must not be ignored.

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Section: Biosorptionmentioning

confidence: 99%

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Mani

Kumar

2013

Int. J. Environ. Sci. Technol.

503

137

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“…[24] However, synergistic adsorption of heavy metal ions and humic acid molecules is still a challenge because of their competitive adsorption onto most adsorbents [25]–[27]. To the best of our knowledge, there have been few studies that have evaluated the use of functionalized magnetic mesoporous silica and graphene oxide in the synergistic adsorption of two kind of pollutants.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Removal of Pb(II), Cd(II) and Humic Acid by Fe3O4@Mesoporous Silica-Graphene Oxide Composites

et al. 2013

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The synergistic adsorption of heavy metal ions and humic acid can be very challenging. This is largely because of their competitive adsorption onto most adsorbent materials. Hierarchically structured composites containing polyethylenimine-modified magnetic mesoporous silica and graphene oxide (MMSP-GO) were here prepared to address this. Magnetic mesoporous silica microspheres were synthesized and functionalized with PEI molecules, providing many amine groups for chemical conjugation with the carboxyl groups on GO sheets and enhanced the affinity between the pollutants and the mesoporous silica. The features of the composites were characterized using TEM, SEM, TGA, DLS, and VSM measurements. Series adsorption results proved that this system was suitable for simultaneous and efficient removal of heavy metal ions and humic acid using MMSP-GO composites as adsorbents. The maximum adsorption capacities of MMSP-GO for Pb(II) and Cd (II) were 333 and 167 mg g−1 caculated by Langmuir model, respectively. HA enhances adsorption of heavy metals by MMSP-GO composites due to their interactions in aqueous solutions. The underlying mechanism of synergistic adsorption of heavy metal ions and humic acid were discussed. MMSP-GO composites have shown promise for use as adsorbents in the simultaneous removal of heavy metals and humic acid in wastewater treatment processes.

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“…NIPA polymer was synthesized by free radical polymerization following a procedure reported previously [25,26]. The weight average molecular weight of the NIPA polymer was 4.3 Â 10 6 , which was determined by size-exclusion chromatography.…”

Section: Preparation Of Composite and Macroporous Hydrogelsmentioning

confidence: 99%

Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

Sato

Noma

Tokuyama

2015

European Polymer Journal

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Removal of heavy metal ions and humic acid from aqueous solutions by co-adsorption onto thermosensitive polymers

Cited by 58 publications

References 20 publications

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Synergistic Removal of Pb(II), Cd(II) and Humic Acid by Fe3O4@Mesoporous Silica-Graphene Oxide Composites

Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

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