Synthesis of Hierarchically Structured Metal Oxides and their Application in Heavy Metal Ion Removal

Hu, Jin‐Song; Zhong, Liangshu; Song, Weiguo

doi:10.1002/adma.200800623

Cited by 575 publications

(313 citation statements)

References 18 publications

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“…In aqueous systems, both 1-D nanowires and 2-D membranes with crystalline structures were prepared by controlling the ratio of zinc to silicon and the amount of mineralizer. Since silicates are low cost in comparison with other nanostructured absorbents such as iron-based nanoabsorbents [33,34], CeO 2 supported on CNTs [35], and layered titanate nanofibers [36], the prepared zinc silicate samples were used as absorbents to remove toxic metal ions. Compared with magnesium silicate hollow spheres, which we have reported previously [37], the amorphous zinc silicate hollow spheres show better removal capacity for Pb(Ⅱ), Cd(Ⅱ), Cr(Ⅲ), and Fe(Ⅲ) ions in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Fine tuning of the dimensionality of zinc silicate nanostructures and their application as highly efficient absorbents for toxic metal ions

Yang

Zhuang

et al. 2010

Nano Res.

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The controllable synthesis of materials with the desired crystal structure and dimensionality is of great significance in material science. In this work we report the successful synthesis of amorphous and crystalline zinc silicates with different dimensionalities and well-defined shapes, including hollow spheres, nanowires and membranes. The structure-related absorption properties have been studied. A detailed study of their ability to remove Pb(Ⅱ), Cd(Ⅱ), Cr(Ⅲ), and Fe(Ⅲ) ions has been performed. The amorphous zero-dimensional (0-D) hollow spheres show the best removal ability for all the metal ions investigated. In particular, their absorption capacity for Pb(Ⅱ) ions is 129 mg/g, which is double the value reported for magnesium silicate hollow spheres. However, the removal abilities of crystalline one-dimensional (1-D) nanowires and two-dimensional (2-D) membranes are found to be dependent on the charge of the target metal ion. In general, nanowires show better removal capacity for trivalent ions, especially Fe(Ⅲ), while 2-D membranes exhibit better removal capacity for divalent ions.

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Section: Introductionmentioning

confidence: 99%

Fine tuning of the dimensionality of zinc silicate nanostructures and their application as highly efficient absorbents for toxic metal ions

Yang

Zhuang

et al. 2010

Nano Res.

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“…2,30,31 Currently, the heavy metal removal with a higher adsorption capacity and reaction rate is often achieved by using iron or iron oxide nanostructures. [32][33][34][35][36][37] However, there are two major challenges to be solved when using these nanomaterials. One comes from the easy oxidation of the pure Fe nanoparticles (NPs) [38][39][40] and the other is the difficulty to recycle these NPs with such a small size, especially in a continuous flowing system.…”

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confidence: 99%

Magnetic Graphene Nanoplatelet Composites toward Arsenic Removal

Zhu

Sadu

Wei

et al. 2012

ECS J. Solid State Sci. Technol.

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Magnetic graphene nanoplatelet composites (MGNCs) decorated with core-shell Fe-Fe 2 O 3 nanoparticles (NPs) have been synthesized using a facile one-pot thermal decomposition method. The graphene nanoplatelets (GNPs) decorated with uniformly dispersed NPs are observed to exhibit a strong magnetization and can be magnetically separated from the liquid mixture by a permanent magnet. These MGNCs demonstrate an effective and efficient adsorption of arsenic(III) in the polluted water due to the increased adsorption sites in the presence of magnetic NPs. The adsorption behavior is well fitted with both Langmuir and Freundlich models, which show a significantly higher adsorption capacity (11.34 mg/g) than the other adsorption values reported on the conventional iron oxide based adsorbents (∼1 mg/g). The results show a nearly complete As(III) removal within 1 ppb. © 2012 The Electrochemical Society. [DOI: 10.1149/2.010201jss] All rights reserved.Manuscript received March 8, 2012. Published July 17, 2012 Arsenic is known for its toxicity and carcinogenicity to human beings, 1-3 the contaminated water with arsenic is becoming a significantly increasing issue in drinking water throughout the world. Longterm exposure to arsenic can cause cancers of the bladder, lungs, skin, kidney, liver and prostate. 4 Arsenic contaminates include both natural and anthropogenic sources. Anthropogenic arsenic pollutants originate from mining and smelting of non-ferrous metals, burning of fossil fuels, usage of arsenic-containing pesticides in the agriculture 5 and arsenic-containing chemicals in the preservation of timber.6 Arsenic can exit in both inorganic and organic forms. In general, inorganic arsenic compounds are more toxic than organic arsenic compounds, and arsenite [As(III)] is considerably more mobile and toxic than arsenate [As(V)].7 Arsenate (i.e., HAsO 4 2− ) is the primary anion in the aerobic surface water and arsenite (i.e., H 3 AsO 3 or H 2 AsO 3 − ) is the primary species in the ground water. The actual valence states and chemical form, however, depend on the redox environments in the water systems including pH, oxidation-reduction potential, and the presence of complexing ions. There are several requirements that need to be met for arsenic removal such as safe and easy operation, high efficiency and low cost.7 Compared to the conventional water treatment techniques including oxidation/precipitation, 21 membrane/reverse osmosis, coagulation/coprecipitation, 22 and ion exchange, 7 adsorption has the following advantages. For example, it does not need a large volume or additional chemicals for treatment and it is easier to be deployed * Electrochemical Society Active Member.z E-mail: suying.wei@lamar.edu; zhanhu.guo@lamar.edu as a Point of Entry/Point of Use (POE/POU) arsenic removal process. Moreover, adsorption processes produce no sludge as met in the coagulation approach 7 and it does not need a strict control of pH values as met in the oxidation process.23 Adsorption can be dealt with low cost medium, low-tech operatio...

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“…The removal of industrial pollutants from wastewater has attracted considerable attention in recent years [1,2]. As well known, industrial wastewater usually contains heavy metal ions [e.g., Cr(VI), Pb(II), Hg(II)] and organic pollutants (e.g., methyl blue, methyl orange).…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Poly(ionic liquid) for Highly Effective Separation of Methyl Blue and Chromium Ions from Water

Jiang

Kong

2013

Polymers

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Abstract:The hydrophobic poly(ionic liquid) of poly(3-ethyl-1-vinylimidazolium bis(trifluoromethanesulfonyl)imide) (PVI-TFSI) containing imidazolium cations and bis(trifluoromethanesulfonyl)imide anions was synthesized for the separation of methyl blue and chromium ions [Cr(VI)] from water. The adsorption of methyl blue and Cr(VI) in PVI-TSFI/water system reached equilibrium stage within 60 min and 12 h, and the maximum adsorbed percentage for methyl blue and Cr(VI) was 97.6% and 98.0%, respectively. The adsorption regi me of either methyl blue or Cr(VI) for PVI-TFSI was in correspondence with the Langmuir adsorption model. The maximum adsorption capacity of PVI-TFSI for methyl blue and Cr(VI) was determined as 476.2 and 17.9 mg/g, respectively. The hydrophobic poly(ionic liquid) with a remarkable adsorbent capacity of methyl blue and Cr(VI) can be conveniently synthesized and shows potential in water treatment for the effective separation of organic dyes or heavy metal ions.

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Synthesis of Hierarchically Structured Metal Oxides and their Application in Heavy Metal Ion Removal

Cited by 575 publications

References 18 publications

Fine tuning of the dimensionality of zinc silicate nanostructures and their application as highly efficient absorbents for toxic metal ions

Fine tuning of the dimensionality of zinc silicate nanostructures and their application as highly efficient absorbents for toxic metal ions

Magnetic Graphene Nanoplatelet Composites toward Arsenic Removal

Hydrophobic Poly(ionic liquid) for Highly Effective Separation of Methyl Blue and Chromium Ions from Water

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