Chemistry Science and Technology

Biography

Hanen Bessaies perusing her PhD Jointly in Department of Chemistry by Faculty of Sciences of Tunis, Tunis El Manar University, Tunisia and Laboratory of Green Chemistry, Lappeenranta University of Technology, Finland. India. She has published/presented few papers in high repute international journals.

           

 

Abstract

 

The key objective of this present study is to compare two new materials Zn/Al  Layred double hydroxide (LDH) intercalated cellulose (CL) nanocomposite (CL-Zn/Al LDH) and Ca/Al  Layred double hydroxide (LDH) intercalated cellulose (CL) nanocomposite (CL-Ca/Al LDH)  for removal of arsenic (V) and (III). The CL-Zn/Al LDH and CL-Ca/Al LDH were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Elemental analysis EA, Brauner, Emmett and Teller method (BET), Transmission electron microscopy (TEM), Raman (RMN). XRD analysis represented the crystalline nature of LDH nanocomposite and TEM analysis approved the formation of a sheet like structure of LDH for both sorbent. Various parameters including contact time, pH, adsorbent dosage, initial concentration and temperature were optimized to  achieve maximum adsorption capacity. Adsorption kinetics results were analyzed using the pseudo first order, pseudo second order, intraparticles diffusion and  the Boyd model. The adsorption isotherm results showed that the maximum adsorption capacity of As(V) (36.46 mg/g on CL-Zn/Al LDH, 36.29 mg/g on CL-Ca/Al LDH) and As(III) (30.15 mg/g on CL-Zn/Al LDH, 10.91 mg/g on CL-Ca/Al LDH) ions with both sorbents as judged from the Langmuir and Frendlich (R² ≥ 0.9) model. Thermodynamic studies for As(III) and As(V) over CL-Zn/Al LDH and CL-Ca/Al LDH illustrated that the process of adsorption is spontaneous. It could be motionned that Zn/Al Layered double hydroxide (LDH) intercalated cellulose (CL) nanocomposite is more effective for As(III) removal than CL-Ca/Al LDH nanocomposite.

Abstract
The key objective of this present study is to compare two new materials Zn/Al  Layred double hydroxide (LDH) intercalated cellulose (CL) nanocomposite (CL-Zn/Al LDH) and Ca/Al  Layred double hydroxide (LDH) intercalated cellulose (CL) nanocomposite (CL-Ca/Al LDH)  for removal of arsenic (V) and (III). The CL-Zn/Al LDH and CL-Ca/Al LDH were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Elemental analysis EA, Brauner, Emmett and Teller method (BET), Transmission electron microscopy (TEM), Raman (RMN). XRD analysis represented the crystalline nature of LDH nanocomposite and TEM analysis approved the formation of a sheet like structure of LDH for both sorbent. Various parameters including contact time, pH, adsorbent dosage, initial concentration and temperature were optimized to  achieve maximum adsorption capacity. Adsorption kinetics results were analyzed using the pseudo first order, pseudo second order, intraparticles diffusion and  the Boyd model. The adsorption isotherm results showed that the maximum adsorption capacity of As(V) (36.46 mg/g on CL-Zn/Al LDH, 36.29 mg/g on CL-Ca/Al LDH) and As(III) (30.15 mg/g on CL-Zn/Al LDH, 10.91 mg/g on CL-Ca/Al LDH) ions with both sorbents as judged from the Langmuir and Frendlich (R² ≥ 0.9) model. Thermodynamic studies for As(III) and As(V) over CL-Zn/Al LDH and CL-Ca/Al LDH illustrated that the process of adsorption is spontaneous. It could be motionned that Zn/Al Layered double hydroxide (LDH) intercalated cellulose (CL) nanocomposite is more effective for As(III) removal than CL-Ca/Al LDH nanocomposite.