Study of the Interaction of Heavy Metals (Cu(II), Zn(II)) Ions with a Clay Soil of the Region of Naima-Tiaret-Algeria

Abstract

The RM (RM stands for the pristine clay) collected from sites in the Naima-Tiaret-Algeria and its purified phase TM (TM stands for the treated clay) were characterized using XRF, XRD, FT−IR, SEM−EDX, and DC electrical conductivity techniques. The as-prepared clays were used as potential adsorbents for the removal of Cu2+ and Zn2+ metals ions. Highly purified clay TM, exhibiting a basal, spacing of 25.83 Å and CEC of 51 meq/100 g, was obtained. The type of interstratified I/M in the studied sites is S=1, based on the calculation method of Watanabe. The percentage of illite type S=1 is between 80−85% illite. The adsorption equilibrium was established in 60 min with the capacities of 28.57 and 24.39 mg/g for Cu2+ onto RM, 32.25 and 4.95 mg/g for Zn2+ in the presence of TM. D-R isotherm model was more suitable with the adsorption process than Freundlich and Langmuir models suggesting the ion exchange nature of the retention mechanism in most cases (E > 8 kJ/mol). Pseudo second-order model best described the kinetics of adsorption process. The adsorption mechanism was mainly monitored by ion exchange mechanism between exchangeable interlayer cations (Na) in the interstratified I/M and Cu2+ or Zn2+ metals from aqueous matrix. Further, the release of H+ ions from the edge of the layer structure in acidic environments promote the adsorption of heavy metals onto the surfaces interstratified I/M clay soils via electrostatic attraction. Copyright © 2020 BCREC Group. All rights reserved

Cross‐Linked Amidoximated Poly(acrylonitrile‐acrylic acid) Microspheres with Exceptional Adsorption Capacity, Reusability towards Copper(II): Batch and Column Studies

“…Intra-particle diffusion model: (7) where q t (mg g À 1 ) is the adsorption capacity at time t, k 1 (min À 1 ) and k 2 (g mg À 1 ⋅min À 1 ) are the rate constants of the PFO and PSO models, respectively. a (mg g À 1 ⋅min À 1 ) and b (g mg À 1 ) are the rate constants of initial adsorption and desorption.…”

“…Common substrates generally make full use of the surface to adsorb, such as activated carbon, bentonite, zeolite, metal organic frameworks, chitosan-based, and polymer. [6][7][8] For polymer, designable multilevel structures not only bring a large specific surface area, but also provide the surface for functional modification. [9] A lot of effort thus has been devoted to functionalizing the surface of some suitable polymer.…”

“…The techniques to treat heavy metal ion effluents include electrolysis, chemical precipitation, adsorption, ion exchange, membrane separation, and biological methods, [4,5] etc., among which the adsorption method shows great attraction due to its easy operation, simple and low‐cost characteristics for removing heavy metals ions. Common substrates generally make full use of the surface to adsorb, such as activated carbon, bentonite, zeolite, metal organic frameworks, chitosan‐based, and polymer [6–8] . For polymer, designable multilevel structures not only bring a large specific surface area, but also provide the surface for functional modification [9] .…”