Adsorption of Hg<sup>2+</sup> by thiol functionalized hollow mesoporous silica microspheres with magnetic cores

Xian, Zhang; Tang, Wilson H.; Zhang, Yunxia; Ng, Dickon H. L.; Zhao, Huijun; Wang, Guozhong

doi:10.1039/c5ra05184c

Cited by 49 publications

(23 citation statements)

References 42 publications

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“…For Fe 3 O 4 @MCM-41-SH, three new peaks were observed in its spectra. The weak peak at 2550 cm À1 proved the presence of -SH groups [40]. Other peaks at 2850 and 2926 cm À1 are related to aliphatic -CH 2 vibrations because of propyl groups introduced during the functionalization procedure [41].…”

Section: Ftir Analysismentioning

confidence: 96%

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Ulu

Noma

Köytepe

et al. 2018

Artificial Cells, Nanomedicine, and Biotechnology

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l-Asparaginase (l-ASNase) is a vital enzyme for medical treatment and food industry. Here, we assessed the use of FeO@Mobil Composition of Matter No. 41 (MCM-41) magnetic nanoparticles as carrier matrix for l-ASNase immobilization. In addition, surface of FeO@MCM-41 magnetic nanoparticles was functionalized with 3-mercaptopropyltrimethoxysilane (MPTMS) to enhance stability of l-ASNase. The chemical structure, thermal properties, magnetic profile and morphology of the thiol-functionalized FeO@MCM-41 magnetic nanoparticles were characterized with Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential thermal analysis (DTA), differential scanning calorimetry (DSC), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray (EDX) spectroscopy and zeta-potential measurement. l-ASNase was covalently immobilized onto the thiol-functionalized FeO@MCM-41 magnetic nanoparticles. The properties of the immobilized enzyme, including optimum pH, temperature, kinetic parameters, thermal stability, reusability and storage stability were investigated and compared to free one. Immobilized enzyme was found to be stable over a wide range of pH and temperature range than free enzyme. The immobilized l-ASNase also showed higher thermal stability after 180 min incubation at 50 °C. The immobilized enzyme still retained 63% of its original activity after 16 times of reuse. The Km value for the immobilized enzyme was 1.15-fold lower than the free enzyme, which indicates increased affinity for the substrate. Additionally, the immobilized enzyme was active over 65% and 53% after 30 days of storage at 4 °C and room temperature (∼25 °C), respectively. Thereby, the results confirmed that thiol-functionalized FeO@MCM-41 magnetic nanoparticles had high efficiency for l-ASNase immobilization and improved stability of L-ASNase.

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Section: Ftir Analysismentioning

confidence: 96%

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Ulu

Noma

Köytepe

et al. 2018

Artificial Cells, Nanomedicine, and Biotechnology

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“…HMS can be also applied for the adsorption of heavy metal ions and dye molecules; the adsorption/removal of heavy metal ions (Hg 2+ , Pb 2+ ) and dyes (basic red 5, methylene blue, rhodamine B) using thiol functionalized HMSs with magnetic cores and MnSiO 3 ‐decorated HMSs, respectively. HMSNs loaded with molecularly imprinted polymers was also reported to exhibit the highly efficient and selective removal of trace lead from aqueous solutions …”

Section: Advanced Applicationsmentioning

confidence: 99%

Hollow Mesoporous Functional Hybrid Materials: Fascinating Platforms for Advanced Applications

Park¹,

Ha²

2017

Adv Funct Materials

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Functionalized hollow nano-and microspheres containing both hollow and mesoporous structures are fascinating materials for a broad range of applications, such as nanoparticle collectors, catalysis, drug delivery systems, immobilization of biomolecules, and the adsorption and separation of gas and pollutants, because of their empty interior. These hollow mesoporous silica materials are synthesized mainly via soft-and hard-templating routes and are usually modified with a range of organic functional groups (SH, NH 2 , CN, CH 3 , CC, benzene, fluorine linked organoalkylsilanes, and ethane-, amine, benzene, and biphenyl-bridged silanes) to improve their performance in many applications. This article outlines the most advanced applications of silica-based and functionalized hollow mesoporous materials that are reported in the last 3 years (January 2014-June 2017). The high applicability of hollow materials in various fields is discussed, including drug delivery and cancer therapy, bioimaging, adsorption/separation, catalysis, thermal and electrical insulators, anticorrosion, sensors, fuel cells, proton conductors, membrane, optics, superhydrophobic surfaces, and fire safety.

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“…To date, several methods have been developed to remove the mercury ions in contaminated industrial effluents . Among them, adsorption using porous adsorbents is always regarded as a superior technology for wastewater purification due to its simplicity and low cost.…”

Section: Introductionmentioning

confidence: 99%

“…To date, several methods have been developed to remove the mercury ions in contaminated industrial effluents. [3,[7][8][9][10][11] Amongthem, adsorption using porous adsorbents is always regarded as as uperior technologyf or wastewater purification due to its simplicity and low cost. Compared to traditional porousm aterials (clays, activatedc arbons, and zeolites) with limited uptake capacity,c urrent research effortsh ave focused on the developmento ffunctional porous adsorbents with various sulfur-based ligands, such as thiol, thiourea,a nd thioether groups,w hich can enhance the removal efficiency of Hg 2 + from contaminated wastewater through soft Lewis acid-based interaction.…”

Section: Introductionmentioning

confidence: 99%

A Polymerization‐Cutting Strategy: Self‐Protection Synthesis of Thiol‐Based Nanoporous Adsorbents for Efficient Mercury Removal

Wang

et al. 2018

Chemistry A European J

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Highly toxic heavy metal ions such as mercury ions (Hg ) are a great threat to human life and the environment. Developing new strategies and materials to remove the toxic heavy metal ions has attracted more and more attentions. Herein a facile self-protection synthesis of thiol-based nanoporous adsorbents for efficient mercury removal via a polymerization-cutting strategy is reported. The direct free-radical polymerization of divinyl disulfide derivative and subsequently cutting off the disulfide linkage, without post-synthesis or modification, can give rise to an exceptionally high density of thiol chelating sites. Moreover, the resultant thiol-based nanoporous adsorbents (NAs-SH) exhibit a high saturation uptake capacity (1240 mg g ) and reused ability for mercury removal from water solution. The proposed polymerization-cutting strategy may provide an alternative and cost-effective method for the design and synthesis of various efficient nanoporous adsorbents at large scale in the future.

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Adsorption of Hg²⁺ by thiol functionalized hollow mesoporous silica microspheres with magnetic cores

Abstract: Thiol functionalized hollow mesoporous silica spheres with magnetic cores were synthesized and found to be highly selective adsorbents of Hg2+.

Cited by 49 publications

References 42 publications

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Hollow Mesoporous Functional Hybrid Materials: Fascinating Platforms for Advanced Applications

A Polymerization‐Cutting Strategy: Self‐Protection Synthesis of Thiol‐Based Nanoporous Adsorbents for Efficient Mercury Removal

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Adsorption of Hg2+ by thiol functionalized hollow mesoporous silica microspheres with magnetic cores

Abstract: Thiol functionalized hollow mesoporous silica spheres with magnetic cores were synthesized and found to be highly selective adsorbents of Hg2+.

Cited by 49 publications

References 42 publications

Magnetic Fe3O4@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Magnetic Fe3O4@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Hollow Mesoporous Functional Hybrid Materials: Fascinating Platforms for Advanced Applications

A Polymerization‐Cutting Strategy: Self‐Protection Synthesis of Thiol‐Based Nanoporous Adsorbents for Efficient Mercury Removal

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Adsorption of Hg²⁺ by thiol functionalized hollow mesoporous silica microspheres with magnetic cores

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization

Magnetic Fe₃O₄@MCM-41 core–shell nanoparticles functionalized with thiol silane for efficient l-asparaginase immobilization