Nanoclay-Supported Zero-Valent Iron as an Efficient Adsorbent Material for Arsenic

Abstract

The release of arsenic to aqueous environment imposes threats to human health. Montmorillonite supported zero-valent iron (ZVI-MMT) is a material with capability of immobilizing arsenic from aqueous environment. The arsenic adsorption efficiency of ZVI-MMT was obtained. In addition, adsorption kinetics of arsenic contaminated water on the material was determined. Arsenic and iron content was quantified by an inductively coupled plasma mass spectrometer (ICP-MS), interplanar distance of the adsorbent was measured by x-ray diffractometer (XRD), and the morphology of the adsorbent was obtained from a transmission electron microscope (TEM). Isotherm data were analyzed using the Langmuir and Freundlich isotherms. The data fitted well to Langmuir isotherm with derived adsorption capacity of 20.1 mg/g. Kinetics data were analyzed using intra-particle model, Elovich equation, pseudo first-, and pseudo second-order models. Elovich equation and pseudo second-order equation fitted the experimental data with pseudo second-order rate constant of 61.2 x 10-4 g/mg-min.

Kinetics and Isotherms of an Iron-Modified Montmorillonite/Polycaprolactone Composite Nanofiber Membrane for the Adsorption of Cu(II) Ions

“…Iron Modification of Montmorillonite Clay. The Fe-MMt clay preparation stage was adapted from the research of [4]. An FeCl3 solution was added dropwise while dispersing Nanofil 116 into a beaker with distilled water, with subsequent addition of NaOH solution and more distilled water.…”

“…One of the most viable ways to remove heavy metals in water is through adsorption using clay minerals. Montmorillonite clay particles and its derivatives have already been successfully utilized as adsorbent for heavy metal ions including copper and arsenic as observed in prior studies [3,4]. This study is focused on using an electrospun Fe-MMt/PCL nanofiber membrane to provide an adsorbent that is easier to use and collect after treatment.…”

Effect of Processing Parameters on the Diameter and Morphology of Electrospun Iron-Modified Montmorillonite (Fe-MMT)/Polycaprolactone Nanofibers

“…Cloisite Na+ obtained from Southern Clay Products, ferric chloride (FeCl3) and analytical grade sodium hydroxide from Techno Pharchem were used in preparation of iron-modified montmorillonite (Fe-MMT). The procedure used for the modification is that of Dela Cruz, et al [1].…”

“…Iron-modified montmorillonite (Fe-MMT) has been widely studied as an effective adsorbent of arsenate (As (V)), mercury (Hg (II)), anionic dyes, hydrogen sulfide, and other wastewater chemical contents [1][2][3][4][5]. To provide ease of handling and easier separation from wastewater, the immobilization of the clay particle in a polycaprolactone (PCL) nanofiber matrix through electrospinning was previously studied.…”

Nanoclays as Eco-friendly Adsorbents of Arsenic for Water Purification

“…Nanoclay-supported zero-valent iron was tested as a material for adsorption of arsenic in a study by Dela Cruz et al [42]. Sodium montmorillonite was mixed with anhydrous FeCl 3 , then Fe 3+ ions were reduced to Fe 0 with use of NaBH 4 .…”