Facile crosslinking synthesis of hyperbranch-substrate nanonetwork magnetite nanocomposite for the fast and highly efficient removal of lead ions and anionic dyes from aqueous solutions

Abstract

The aim of the present work was to investigate the effect of surface functional group density on the adsorption behaviors of functionalized mesoporous Fe 3 O 4 . Amino modified mesoporous Fe 3 O 4 (Fe 3 O 4 -NH 2 ) nanoparticles were firstly prepared through a classical solvothermal method, then a novel three-dimensional hyperbranch structured nanocomposite (Fe 3 O 4 -HBPA) was synthesized though amino terminated hyperbranched polymer (HBPA) modification without any toxic cross-linking agent. The resulting functionalized mesoporous Fe 3 O 4 were characterized by means of TEM, SEM, FTIR, XRD, VSM, TGA and Zeta potential. Adsorptive removal of Pb 2+ and MO in respective single-compoent and binary systems was studied. In heavy metal ion (Pb 2+ , Hg 2+ , Cd 2+ , Cu 2+ etc.) and dye (MO, MGO, MBH, RB and CV), Fe 3 O 4 -HBPA showed higher efficiency removal of Pb 2+ and MO than Fe 3 O 4 -NH 2 . The adsorption of Pb 2+ and MO on Fe 3 O 4 -HBPA was pH dependent with uptake dropping in acidic solution. The Fe 3 O 4 -HBPA adsorbent showed quick adsorption rate, high adsorption capacity, high selectivity for cationic adsorbates. The maximum adsorption capacity was as high as 285.714 mg·g -1 for Pb 2+ and 146.565 mg·g -1 for MO, respectively. The fitness of Langmuir adsorption model and pseudo second-order kinetics for describing the adsorption isotherm and kinetics of Fe 3 O 4 -HBPA for Pb 2+ and MO dye was examined, respectively.

Preparation of Polyaniline/Emulsion Microsphere Composite for Efficient Adsorption of Organic Dyes

“…Because the pseudosecond-order kinetic model is based on the hypothesis of chemical adsorption, the interaction between amino groups in PANI/PSMA and anionic dye molecules was the main driving force for adsorption in the present study. For a better understanding of rate-determining factors in the adsorption process, the adsorption data were analyzed on the basis of the intraparticle diffusion model [35,36] as described in Table 1. The correlation coefficients (R 2 ) were 0.8077 (20 mg/L) and 0.9173 (30 mg/L).…”

Zwitterionic Polymer Brushes Coated with Mesoporous Silica Nanoparticles as Efficient Adsorbents for Dye Removal from Aqueous Solutions

“…Various techniques have been developed to treat polluted water, including oxidation, photocatalytic degradation, biological treatment, and adsorption . The adsorption technique is widely used to remove hazardous materials form wastewater due to the simplicity of operation, safety, and low cost . Various adsorption materials have been developed and used to treat polluted water, including carbon materials, hydrogels, polymer resins, biomass materials, organo-vermiculites, , silica nanosheets, and mesoporous materials …”

“…7 The adsorption technique is widely used to remove hazardous materials form wastewater due to the simplicity of operation, safety, and low cost. 8 Various adsorption materials have been developed and used to treat polluted water, including carbon materials, 9 hydrogels, 10 polymer resins, 11 biomass materials, 12 organo-vermiculites, 13,14 silica nanosheets, 15 and mesoporous materials. 16 Recently, the use of nanomaterials for remediation has been proven to achieve better performance in environmental remediation than other conventional techniques due to their large surface-area-to-volume ratio and high chemical reactivity.…”

Efficient Copper Removal from an Aqueous Anvironment using a Novel and Hybrid Nanoadsorbent Based on Derived-Polyethyleneimine Linked to Silica Magnetic Nanocomposites

“…Because of its solubility in an aqueous environment, it is often immobilized on the particle/support. The combination of the latter has been shown to be not only a biocompatible material in biomedical applications [ 19 ], but also in HM removal applications [ 20 , 21 , 22 ], together with anionic dyes and disinfection [ 23 , 24 , 25 ]. Alternatively, due to the high density of functional groups (i.e., primary amines), bPEI can be crosslinked to an organic functional reactive group, such as the epoxy group.…”