Novel polyamidoamine dendrimer-functionalized palygorskite adsorbents with high adsorption capacity for Pb2+ and reactive dyes

Zhou, Shouyong; Xue, Ailian; Zhang, Yan; Li, Meisheng; Li, Kang; Zhao, Yijiang; Xing, Weihong

doi:10.1016/j.clay.2015.01.032

Cited by 74 publications

(22 citation statements)

References 64 publications

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“…Dendrimers were tethered to silica gel, mesoporous silica (SBA-15), natural clay, fiber, graphene oxide, etc. [6][7][8][9][10]. By combining dendrimers with other materials, the resultant sorbents can acquire the mechanical stability of the other materials in addition to the high binding capacity of the dendrimers.…”

Section: Introductionmentioning

confidence: 98%

Carboxymethyl chitosan-modified magnetic-cored dendrimer as an amphoteric adsorbent

Kim

Jang²,

Park

2016

Journal of Hazardous Materials

104

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Section: Introductionmentioning

confidence: 98%

Carboxymethyl chitosan-modified magnetic-cored dendrimer as an amphoteric adsorbent

Kim

Jang²,

Park

2016

Journal of Hazardous Materials

104

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“…Zhou et al . modified PAL with polyamidoamine dendrimer to improve its chelating capacity to both the Pb(II) and dye29. It is well known that the primary factors limited the adsorption performance of low-grade PAL clay are: (i) the associated minerals in PAL clays show no adsorption activity; (ii) the low specific surface area (<100 m 2 /g) as well as negative charge of raw PAL; (iii) the scanty of Si(M)-OH groups, which is believed to response to the high adsorption capacity.…”

mentioning

confidence: 99%

All-into-one strategy to synthesize mesoporous hybrid silicate microspheres from naturally rich red palygorskite clay as high-efficient adsorbents

Wang

Tian

Wang

et al. 2016

Sci Rep

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A mesoporous hybrid silicate microsphere with superior adsorption performance has been successfully synthesized by employing an “all-into-one” strategy and a simple one-pot hydrothermal process using naturally abundant low-grade red palygorskite (PAL) clay as raw material in the presence of non-toxic SiO32− and Mg2+ ions. As is expected, both the PAL and associated minerals transformed into a new amorphous mesoporous hybrid silicate microsphere without using any additional pore-forming template. The mesoporous silicate microsphere shows a large pore size of 37.74 nm, high specific surface area of 489.81 m2/g (only 54.67 m2/g for raw PAL) and negative surface potential of −43.3 mV, and its maximum adsorption capabilities for Methylene bule (MB) and Crystal violet (CV) reach 407.95 mg/g and 397.22 mg/g, respectively. Meanwhile, 99.8% of MB (only 53% for raw PAL) and 99.7% of CV (only 43% for raw PAL) were sucessfully removed from 200 mg/L of initial dye solution by only using 1 g/L of the adsorbent. In addition, the spent adsorbent can be easily regenerated and repeatly reused for muptiple cycles. The study on adsorption mechanism revealed that electrostatic attraction, hydrogen bonding and chemical complexing interactions are the main factors contributed to the high dye adsorption.

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“…The preparation process of hyperbranched-nano-palygorskite can be described using the schematic diagram in Figure 1. PAMAM-Pal were prepared via a multistep in-situ polymerization during the Michael addition and amidation reaction [30]. The preparation of a PAMAM-Pal nano-clay involved a two-step reaction.…”

Section: Methodsmentioning

confidence: 99%

Preparation of PVDF/Hyperbranched-Nano-Palygorskite Composite Membrane for Efficient Removal of Heavy Metal Ions

et al. 2019

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In this work, three kinds of hyperbranched polyamidoamine-palygorskite (PAMAM-Pal) were designed and synthesized by grafting the first generation polyamidoamine (G1.0 PAMAM), G2.0 PAMAM and G3.0 PAMAM onto Pal surfaces, respectively. Then, these PAMAM-Pals were used as additives to prepare polyvinylidene fluoride (PVDF)/hyperbranched polyamidoamine-palygorskite bicomponent composite membranes. The structures of the composite membranes were characterized by Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TEM), X-ray photoelectron spectroscopy (XPS), field-emission scanning electronmicroscopy (SEM), atomic force microscope (AFM) and Thermogravimetric analysis (TGA). The adsorption properties of composite membranes to heavy metal ions was studied, and the results found that the maximum adsorption capacities for Cu(II), Ni(II) and Cd(II) could reach 155.19 mg/g, 124.28 mg/g and 125.55 mg/g, respectively, for the PVDF/G3.0 PAMAM-Pal membrane, while only 23.70 mg/g, 17.74 mg/g and 14.87 mg/g could be obtained for unmodified membranes in the same conditions. The high adsorption capacity can be ascribed to the large number of amine-terminated groups, amide groups and carbonyl groups of the composite membrane. The above results indicated that the prepared composite membrane has a high adsorption capacity for heavy metal ions removal in water treatment.

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Novel polyamidoamine dendrimer-functionalized palygorskite adsorbents with high adsorption capacity for Pb2+ and reactive dyes

Cited by 74 publications

References 64 publications

Carboxymethyl chitosan-modified magnetic-cored dendrimer as an amphoteric adsorbent

Carboxymethyl chitosan-modified magnetic-cored dendrimer as an amphoteric adsorbent

All-into-one strategy to synthesize mesoporous hybrid silicate microspheres from naturally rich red palygorskite clay as high-efficient adsorbents

Preparation of PVDF/Hyperbranched-Nano-Palygorskite Composite Membrane for Efficient Removal of Heavy Metal Ions

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