Preparation and Heavy Metal Ions Chelating Properties of Multifunctional Polymer-Grafted Silica Hybrid Materials

Abstract

In this research work, novel hybrid materials based on multifunctional polymers and silica were developed and investigated in view of possible employment as sorbents for removal of heavy metal ions from water in presence of various ions. Organic-inorganic hybrid materials were prepared by covalent bonding of vinyl-terminated polyamidoamine (PAA) onto aminated silica particles. Two series of polyamidoamine-grafted silica, differing in the PAA chemical structure, were synthesized, and their heavy metal ions chelating properties were investigated. Column adsorption procedure for Cu, Zn, and Ni in aqueous solution was successfully established. Moreover, the adsorption behaviour of the materials was evaluated in different ionic strength solutions as well as in distilled and natural water. Organic-inorganic hybrid materials exhibited excellent chelating properties and selectivity for different metal ions. The hybrid columns showed exceptional eluting and regenerating property using diluted hydrochloric acid solution as eluent. In particular, the hybrid materials containing more carboxy groups possessed superior adsorption ability, reusability, and stability. The consecutive adsorption-desorption experiments exhibited that this material could be reused more than 20 cycles without almost any loss of adsorption capability. These new organic-inorganic sorbents appear very promising as an effective solid-phase extraction material for the selective preconcentration or removing of heavy metal ions from the environment.

Fast and Reliable Synthesis of Melanin Nanoparticles with Fine-Tuned Metal Adsorption Capacities for Studying Heavy Metal Ions Uptake

“…In addition to the sorbent cases mentioned in Table 2 , our preliminary findings with the new melanin nanoparticles show better removal rates for Cu 2+ , Ni 2+ and Zn 2+ compared to other sorbents, such as polymer-grafted silica systems. 27 In all literature cases examined, we observed that melanin nanoparticles exhibit significantly higher removal capacity of Zn 2+ ions.…”

“…19 The most common adsorption methods are adsorption on activated carbon, [20][21][22] as well as on natural or synthetic polymers. [23][24][25][26][27] Inexpensive powders and natural feedstocks and waste products have also been used in adsorption methods either as such or after conversion to activated carbons. 25 Melanins are a family of polymeric bio-pigments found in many parts of the human body including the hair, skin, and eyes, [28][29][30] and are known to bind a variety of inorganic and organic species.…”

Removal of Ferrous using Citric Acid in Patchouli Oil Purification by Complexometry

“…The dark colour of the oil causes the level the clarity of the oil to be very low, and this is due to its high iron content [ [13], [14]] argues that contamination by iron occurs during the distillation process which uses a metal iron distiller. Iron ions can stimulate oxidation reactions in conjugated double bonds found in patchouli alcohol compounds in patchouli oil to produce colour-forming chromophore compounds from groups >C=C< or >C=C [15].…”

Effect of Salinity on Cr(VI) Bioremediation by Algal-Bacterial Aerobic Granular Sludge Treating Synthetic Wastewater

“…The rapidly increasing global population, along with the development of industrialization, has triggered various environmental issues in many countries worldwide. Heavy metal (HM) in wastewater has emerged as a global environmental concern because of its adverse effects on human beings and ecosystems [1]. Among the HMs commonly found in wastewater, hexavalent chromium (Cr(VI)) is considered as one of the most harmful and toxic metal forms because of its high carcinogenic and mutagenic properties [2,3].…”