Adsorption of arsenic(V) by iron-oxide-coated diatomite (IOCD)

Abstract

This study demonstrated that the granular IOCD was successfully developed and employed to remove the As(V) in aqueous solution. The Freundlich isotherm well fitted the equilibrium adsorption data of As(V) onto IOCD, and both the pseudo-second-order model and the pore diffusion model simulated well the adsorption kinetics. Compared to other iron-oxide-based adsorbents reported in the literatures, the adsorption capacity of IOCD is relatively high and its kinetics is fast.

Removal of basic dyes from aqueous solution by adsorption onto binary iron-manganese oxide coated kaolinite: Non-linear isotherm and kinetics modeling

“…However, the adsorption capacity of the clays is considerably improved upon surface modification. The following methods for clay modifications have been reported in the recent past: (a) acid activation (Hajjaji and El Arfaoui, 2009;Toor and Jin, 2012), (b) thermal activation (Toor and Jin, 2012), (c) intercalation and pillaring (Gil et al, 2011), (d) surfactant treatment (Su et al, 2011), and (e) coating with metal oxides (Pan et al, 2010). The improved adsorption efficiency of the metal oxide coated adsorbents was attributed to increase in surface affinity and surface area.…”

“…The improved adsorption efficiency of the metal oxide coated adsorbents was attributed to increase in surface affinity and surface area. Recently, metal oxide (metal = Mn, Fe and Mg) coated clays (bentonite, sepiolite and diatomite) have received considerable attention for the adsorptive removal of metals and dyes (Eren, 2009;Eren et al, 2009Eren et al, , 2010aEren et al, , 2010bEren et al, , 2010cPan et al, 2010;Eren and Gumus, 2011).…”

The use of superporous p(3-acrylamidopropyl)trimethyl ammonium chloride cryogels for removal of toxic arsenate anions

“…In addition to organic contaminants, inorganic contaminants and different metals types such as arsenic, chromium, lead, mercury and so on, are the main problems for industrial effluents. Water sources can be polluted with arsenic from industrial effluents, and agriculture activities such as fertilizers and pesticides, glass and ceramics industries and medicinal activities, and discharges from chemical processing/manufacturing plants (Jain and Ali, 2000;Pan et al, 2010;Welch et al, 1988).…”

Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

“…The form of arsenic changes with pH and triple-charged As anions (AsO 4 3− ) predominates at pH values higher than 11.5. When an ion transfer process is involved, AsO 4 3− with higher valence may require more functional sites at the CSW surface, which may result in less arsenic uptake [38]. The solution pH is found to mildly fluctuate or decrease after the reaction.…”