Abstract
Removal of heavy metals from wastewater is mandatory in order to avoid water pollution of natural reservoirs. In the present study, layered double hydroxide (LDH) materials were evaluated for removal of zinc from aqueous solutions. Materials thus prepared were impregnated with cyanex 272 using the dry method. These materials were characterized through X-ray diffraction (XRD), Fourier transform infrared (FTIR), and thermal analysis. Batch shaking adsorption experiments were performed in order to examine contact time and extraction capacity in the removal process. Results showed that the equilibrium time of Zn (II) extraction is about 4 h for Mg2Al-CO3 and Mg2Al-CO3-cyanex 272, 6 h for Zn2Al-CO3, and 24 h for Zn2Al-CO3-cyanex 272. The experimental equilibrium data were tested for Langmuir, and Freundlich isotherm models. Correlation coefficients indicate that experimental results are in a good agreement with Langmuir’s model for zinc ions. Pseudo-first, second-order, Elovich, and intraparticular kinetic models were used to describe kinetic data. It was determined that removal of Zn2+ was well-fitted by a second-order reaction kinetic. A maximum capacity of 280 mg/g was obtained by Zn2Al-CO3-cyanex 272.
Highlights
Heavy metal pollution is a widespread environmental problem that can pose serious threats to human health and the ecosystem [1,2]
The Layered double hydroxides (LDH) materials were synthesized by were synthesized by co-precipitation, and Di (2,2,4- trimethylpentyl) phosphinic acid was provided co-precipitation, and Di (2,2,4- trimethylpentyl) phosphinic acid was provided by Cyanamid (New by Cyanamid (New Jersey, USA) as cyanex 272 (85%) (Figure 1)
Cyanex 272 was dissolved in ethanol, and the solution was left in contact with the LDH material under magnetic stirring at room temperature until total evaporation of ethanol
Summary
Heavy metal pollution is a widespread environmental problem that can pose serious threats to human health and the ecosystem [1,2]. The anions; structure of these solids substitution rise to positively charged with interlayer water molecules is derived the brucite structure in which cations partially the divalent. Can be found in nature as minerals such as hydrotalcite the layered double hydroxide(Mg-Fe after rehydration the presence of the desired anion.interlayer. Double hydroxides environments, LDH minerals are are significant determineLayered the uptake of heavy metal are synthesized quite at laboratory scale. Contaminants studies have focused on sorption of cations on LDHs. An important toThe be considered is include oxyanions, monoatomic anions, organic compounds, and gas. On sorption of cations on LDHs. The introduction of waters contaminated withpollutant zinc into theconsidered ecosystemsis represents present in industrial effluents (such as metallurgical and ceramic wastewaters). Kinetics, and sorption mechanisms were determined and discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
