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

Abstract

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.

The Adsorption of Heavy Metal Ions by Poly (Amidoamine) Dendrimer-Functionalized Nanomaterials: A Review

“…Considering their high-affinity interaction with heavy metal ions, PAMAM dendrimers were used to modify membrane materials and improved their adsorption capacity [ 82 , 83 , 84 , 85 ]. With PDVF as a raw substrate, Kotte et al reported a one-pot method for the preparation of a new family of mixed matrix PVDF membranes with in situ synthesized PAMAM dendrimers [ 83 ].…”

Photocatalytic and Adsorptional Removal of Heavy Metals from Contaminated Water using Nanohybrids

“…Metal, zeolite and carbon based nanosorbent are commonly applied adsorbent for water purification. For the adsorptional removal of HMIs different types of adsorbent like humic acid [87], activated carbons [88], bio-chars, sawdust [89], coal ash [90], resin [91], carbon nanotubes [92], graphene oxide [93], zeolites [94], bio-chars [95], sepiolites [96], palygorskite [97], mesoporous materials [98], and layered double hydroxides (LDHs) [99] were reported for heavy metal ion removal. A broad range of nano-adsorbents based on polyaniline (PANI) and its derivatives also appeared as promising candidate for the removal of heavy metals form polluted water [100].…”

Study of antifouling and decolorization effect in polyethersulfone membranes improved with dendrimer‐modified metal–organic frameworks

“…Compared to other macromolecules, polyamidoamine (PAMAM) dendrimers owing to the hyper‐branched and symmetric structure have more amine groups in their spherical structure. Hence, PAMAM is widely applied for the modification of hydrophilicity features and contaminated adsorption in the field of membrane technology 24–29 …”

“…Hence, PAMAM is widely applied for the modification of hydrophilicity features and contaminated adsorption in the field of membrane technology. [24][25][26][27][28][29] Also, chitosan is a natural polysaccharide, non-toxic and inexpensive, with adsorption capability on negative pregnant surfaces due to its polyelectrolyte nature in acidic areas as well as the ability to form a gel, thermal and chemical stability and antibacterial properties can be used as a coating for the MOF. The chitosan surface could be further functionalized due to the high presence of amino, hydroxyl and carboxyl groups.…”