Synthesis of silica gel supported salicylaldehyde modified PAMAM dendrimers for the effective removal of Hg(II) from aqueous solution

Niu, Yuzhong; Qu, Rongjun; Hou, Chen; Mu, Lei; Liu, Xiguang; Wang, Ting; Zhang, Yue; Sun, Changmei

doi:10.1016/j.jhazmat.2014.06.012

Cited by 216 publications

(115 citation statements)

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“…The weight loss under 200°C is attributed to the evaporation of physically adsorbed water. [40] As can be seen, the amount of organic moieties bonded on the surface of the MNPs is relatively high, which indicates the successful construction of the dendrimer on the surface. [40] As can be seen, the amount of organic moieties bonded on the surface of the MNPs is relatively high, which indicates the successful construction of the dendrimer on the surface.…”

Section: Thermogravimetric Analysismentioning

confidence: 91%

Cobalt supported on dendronized magnetic nanoparticles: A new highly efficient and recyclable catalyst for the Mizoroki–Heck cross‐coupling reaction

Arghan

Koukabi

Kolvari

2019

Applied Organom Chemis

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Funding information Semnan UniversityPolyamidoamine (PAMAM) is one of the most interesting types of hyperbranched polymers that carry a large number of amino groups on its surface. PAMAM has gained significant attention from synthetic organic chemists due to its structural characteristics, controllable structure, inner porosity, and ability to trap a wide range of ions and molecules. So, in this work, the PAMAM dendrimer was synthesized, grafted onto the surface of magnetite nanoparticles, and the resulting hybrid nanoparticles were then employed as suitable host for immobilizing cobalt nanoparticles. The newly developed catalyst was well characterized by Fourier transform-infrared, X-ray diffraction, thermogravimetric analysis, field emission-scanning electron microscopy, transmission electron microscopy, atomic absorption spectroscopy, element mapping and energy-dispersive X-ray analysis. The efficiency of the as-prepared nanocatalyst was evaluated for the Mizoroki-Heck crosscoupling reactions. The MNP@PAMAM-Co represented perfect catalytic efficiency and high selectivity for the Mizoroki-Heck cross-coupling reaction compared with previously reported catalysts. The catalyst separation from the reaction mixture was easily achieved with the assistance of an external magnetic field, and its recycling was also investigated for five consecutive runs. Hot filtration confirmed no leaching of the active metal during the Heck coupling.

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Section: Thermogravimetric Analysismentioning

confidence: 91%

Cobalt supported on dendronized magnetic nanoparticles: A new highly efficient and recyclable catalyst for the Mizoroki–Heck cross‐coupling reaction

Arghan

Koukabi

Kolvari

2019

Applied Organom Chemis

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“…Therefore, the adsorption of Hg(II) in acidic solution was unfavorable. As pH increases, most of the protonated -NH 2 and -OH groups are gradually deprotonated and more active binding sites available, which would promote the formation of the complex with Hg(II), and hence the adsorption capacity increased [31]. The high adsorption capacity of AO-PNS-g-PAN for Hg(II) further demonstrated that the chelating effect of amidoxime groups and loose structure played an important role in the adsorption process.…”

Section: Optimization Of the Adsorption Phmentioning

confidence: 98%

Synthesis of peanut shell/polyacrylonitrile copolymer via Cu(0)-mediated RDRP and its adsorption behavior after modification

et al. 2015

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Peanut shell (PNS) was used to prepare a novel adsorbent to achieve resource recovery of the agricultural residue. The hydroxyl groups of peanut shell were turned into -C(CH 3 ) 2 -Br pendant groups to initiate polymerization of acrylonitrile. Graft copolymer peanut shell/polyacrylonitrile (PNS-g-PAN) was modified by hydroxylamine hydrochloride to transform the cyano groups into amidoxime (AO) groups. The modified copolymer of AO-PNS-g-PAN was used as adsorbent. The maximum adsorption capacity for Hg(II) was 4.45 mmol g -1 . The adsorption process fitted well the Freundlich isotherm model and followed pseudo-second-order model. The modified copolymer demonstrated its potential as an efficient adsorbent to solve the problem of Hg(II) contamination. Graphical abstract The peanut shell (PNS) macroinitiator was obtained by acylation of hydroxyl groups on the cellulose backbone of the peanut shell and initiated by Cu(0)-mediated RDRP of acrylonitrile. PNS-g-PAN was modified by NH 2 OHÁHCl and used to remove heavy metal ions. The maximum adsorption capacity of Hg(II) was 4.45 mmol g -1 .

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“…Dendrimer-like polyamidoamine (PAMAM) has attracted considerable attention in metal ions adsorption due to its end amine and ester groups [8][9][10][11]. Considering that if silica-gel could be modified with dendrimer-like PAMAM and functional group for adsorption could be linked to the generous peripheral amine group of PAMAM, it would be possible to improve the adsorption capacity of silica-gel and selectivity.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Lead with Silica Gel Modified with Polyamidoamine Dendrimer and Thiomalic Acid

Chen

Luo

et al. 2016

MATEC Web Conf.

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Abstract.New adsorbents PAMAM-n.0TMSG (n=1,2,3,4) with thiomalic acid as functional group has been prepared based on polyamidoamine dendrimer modified silica gel and characterized with FTIR, SEM and TG. Microcolumn enrichment and measurement of Pb 2+ with graphite furnace atomic absorption spectroscopy (GFAAS) was investigated with PAMAM-n.0TMSG (n=1,2,3,4) as adsorbent. The adsorption conditions were optimized. The increase of grafted generation of PAMAM-n.0TMSG could effectively improved the adsorption performance of adsorbents. The adsorption capacity of adsorbents was 14. 42, 16.19, 20.79 and 25.32 mg g -1 respectively, With PAMAM-4.0TMSG as adsorbent, microcolumn enrichment and measurement of Pb 2+ with GFAAS was proposed. The relative standard deviation (R.S.D.) was 1.4% (n=11) for 0.2 μg mL -1 of Pb 2+. The limit of detection (LOD) of 2.9ng mL í1 was achieved. The proposed column enrichment method was applied for detection of Pb 2+ in tap water and sea water samples successfully.

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Synthesis of silica gel supported salicylaldehyde modified PAMAM dendrimers for the effective removal of Hg(II) from aqueous solution

Cited by 216 publications

References 50 publications

Cobalt supported on dendronized magnetic nanoparticles: A new highly efficient and recyclable catalyst for the Mizoroki–Heck cross‐coupling reaction

Cobalt supported on dendronized magnetic nanoparticles: A new highly efficient and recyclable catalyst for the Mizoroki–Heck cross‐coupling reaction

Synthesis of peanut shell/polyacrylonitrile copolymer via Cu(0)-mediated RDRP and its adsorption behavior after modification

Adsorption of Lead with Silica Gel Modified with Polyamidoamine Dendrimer and Thiomalic Acid

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