Implementation of Carboxymethyl cellulose/Acrylic acid/ Titanium dioxide Nanocomposite Hydrogel in Remediation of Cd(II), Zn(II) and Pb(II) for Water treatment application

Abstract

I N THIS study Acrylic acid/ Carboxymethylcellulose/Titanium dioxide (AAc/CMC-TiO 2) hydrogel nanocomposite was synthesized by free-radical crosslinking copolymerization via gamma irradiation. It was characterized using FT-IR and swelling properties. The swelling percentage increases with increasing time until reaches a certain limiting value after 6h. The synthesized nanocomposite was used as an adsorbent for remediation of Cd(II), Zn(II) and Pb(II) from aqueous solutions by the static adsorption technique. It was found that the optimum pH for the adsorption is 5 and the sorption process is carried out at fast operating time, 30-40 min, for all investigated metal ions. It was also found that the metal ions sorption capacity decreases with increasing the dosage of AAc/CMC-TiO 2 from 5 to 150 mg. A progressive increase in the metal ions sorption capacity was obtained with increasing the initial metal ion concentration from 0.01 to 0.05 mol L-1 and the saturation of the sorbent active sites was done at initial metal ions concentration at 0.1 mol L-1. No significant interference on the removal of Pb (II) in the presence of NaCl, Na-acetate, KCl, KNO 3 and NH 4 Cl ions while a slight decrease in removal of Cd (II)and Zn(II) was done. The pseudo-second order kinetic model and Freundlich adsorption model describe well the kinetic and isotherm, respectively, of the adsorption process of the investigated ions.

Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

“…However, surpassing the 0.1 g threshold in the nanocomposite did not yield a significant increase in MB dye removal (%). This disparity highlights the superior removal of the nanocomposite, due to the integration of MWCNTs, surpassing the performance of the hydrogel, even with counterpart amounts of adsorbent 38,39 …”

“…This disparity highlights the superior removal of the nanocomposite, due to the integration of MWCNTs, surpassing the performance of the hydrogel, even with counterpart amounts of adsorbent. 38,39 Figure 5c shows the MB dye removal (%) improvement through increasing the contact time with MB dye solution till reaching equilibrium at 300 min. It is obvious that the presence of a fixed amount of nanocomposite in contact with the adsorbate dye solution permits to adsorb of more dye molecules.…”

Characterization and Adsorption Properties of Starch‐Based Nanocomposite for Removal of Simulated Low‐Level Radioactive Waste

“…These models should know the adsorption process control mechanism. [ 27 ] The Pseudo‐1st order model can be referred to: $$$$\begin{equation}{\rm{ln (}}{{\rm{q}}_{\rm{e}}}{\rm{ - }}{{\rm{q}}_{\rm{t}}}{\rm{) }} = \ln {q_e} - {k_1}t\end{equation}$$$$…”

“…These models should know the adsorption process control mechanism. [27] The Pseudo-1st order model can be referred to: ln(q e −q t ) = ln q e − k 1 t…”

Studying the treatability of different types of nanoparticles for oil content removal from oily wastewater produced from refinery process

“…The most popular metal oxides used as adsorbents are iron oxides (FexOy), silicon (Si), titanium (Ti) and tungsten (W). They are at most used for adsorption of heavy metals and radionuclides [15,16]. MCM-41, one of the members of M41S reported by scientists at the Mobil Research & Development Corporation in 1992, is a hexagonal and ordered mesoporous silica material, with uniform mesopores.…”