Functionalized halloysite nanotubes for enhanced removal of lead(II) ions from aqueous solutions

Abstract

In this study, environmental friendly halloysite nanotubes and their amino derivatives were used as adsorbent materials for lead(II) ions. The adsorption ability of both nanomaterials towards Pb 2+ ions has been studied in NaCl aq , at I = 0.1 mol L -1 , in the pH range 3 -6. Moreover, the effect of ionic strength on the adsorption process was evaluated at the pH of maximum efficiency of the adsorbent materials. Kinetic and equilibrium experiments were carried out by using the Differential Pulse Anodic Stripping Voltammetry (DP-ASV) technique to check the metal ion concentration in solution after contact with the two adsorbents. Different isotherm and kinetic equations were used to fit the experimental data. The speciation of metal ion and the characterization of the adsorbents with different techniques were considered in order to establish the suitable experimental conditions for the metal ion removal. The collected data showed that the functionalization of halloysite enhances the adsorption ability of the clay mineral and it makes the nanoclay a good candidate for metal removal from aqueous solutions.

Halloysite Nanotubes as Adsorptive Material for Phosphate Removal from Aqueous Solution

“…Several models have been proposed to investigate the mechanism of adsorption onto several HNTs [19,21].…”

“…However, except adsorption, most of these methods involve high capital cost with recurring expenses, which are not suitable for many parts of the world [15][16][17][18]. Several adsorbents have been investigated in various studies for the removal of phosphate from aqueous solution such as nanoparticles [19,20], nanoscale zero-valent materials [21], activated red mud [22], biogenetic calcium carbonate minerals [23], hybrid impregnated polymeric sorbent containing hydrated ferric oxide [24], industrial acidified laterite by-product [25], mixture of sand and dolomite [26], slag and fly ash [27], steel slags [28], silicate hybrid materials [29], schwertmannite (which is ferric oxyhydroxide sulphate) [30], and volcanic rocks [31]. Nanoparticle clay mineral receives much more attention among the natural adsorbents due to the high specific surface area, high adsorption rates compared to other adsorbents, low toxicity, easy operation, and, to some extent, cost-effectiveness.…”

Mxene/alginate composites for lead and copper ion removal from aqueous solutions

“…In recent years, with the development of wastewater technologies, such as adsorption, membrane ltration, chemical precipitation and ion exchange, great progress has been made in the treatment and purication of heavy metals in wastewater. [3][4][5] Among these methods, adsorption is regarded as a promising method given its simple operation, high treatment efficiency, low-cost, and excellent recyclability. 6 Mxene, a new graphene-like 2D material, has a wide range of applications in energy storage, catalysis and sewage treatment due to its unique layered structure and hydrophilic surface.…”

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

“…Several kinds of natural or chemically modified materials including activated carbons, carbon nanotubes, zeolites and clays [8,[49][50][51][52][53][54][55][56][57][58], were investigated to remove contaminants from effluents. In recent years, there has been growing interest in clay minerals which are green, inexpensive and effective adsorption substrates [5,[59][60][61][62][63][64][65].…”