Removal of Cu(II), Pb(II) and Cr(VI) ions from aqueous solution using amidoximated non-woven polyethylene-g-acrylonitrile fabric

Abstract

Pre-irradiation method was applied to graft acrylonitrile (AN) onto non-woven polyethylene film. Graft yield reached 130% at 70 kGy radiation dose, 60% monomer concentration and 4 h reaction time when H 2 SO 4 was used as an additive. The modification of AN grafted films with hydroxyl amine hydrochloride was done for the preparation of amidoxime adsorbent. The constructed adsorbent was characterized using FTIR, DMA and SEM. The amidoxime adsorbent was used for adsorption of Cu(II), Pb(II) and Cr(VI). Adsorption capacity was investigated under different conditions: contact time, pH and initial metal ion concentration. The optimum condition for maximum adsorption was found to be contact time 72 h and initial metal concentration 500 ppm for all the metal ions studied and pH 5.2 for Cu(II), 5.4 for Pb(II), 1.5 for Cr(VI). Kinetic adsorption data was elucidated using pseudo-first-order and pseudo-second-order equations. The equilibrium experimental data of metal adsorption matched Langmuir isotherm model. From the Langmuir equation, the monolayer saturation adsorption capacity (highest adsorption capacity) of the adsorbent was found to be 74.62 mg/g for Cu(II), 107 mg/g for Pb(II) and 156.25 mg/g for Cr(VI). The thermodynamics of metal adsorption was also investigated. Furthermore, desorption and reuse of the adsorbent film was studied. The results suggest that the adsorbent can be effective for adsorption of Cu(II), Pb(II) and Cr(VI).

Synthesis of Amidoxime Adsorbent by Radiation-Induced Grafting of Acrylonitrile/Acrylic Acid on Polyethylene Film and Its Application in Pb Removal

“…The data optioned are shown in Figure 10 d and illustrate that as the concentration of metal ions rises, the sorption also increases until a certain concentration (3 ppm), and after that, it decreases. This may be attributed to the active sites (amidoxime and hydroxyl function groups), which are responsible for chelation, being saturated with the metal ion at certain concentrations and, at very higher concentrations, there is no available space for adsorption, which may lead to the decrease in the sorption percentage [ 41 , 42 ].…”

Removal of Cadmium (II), Chromium (III), and Lead (II) Heavy Metal Ions from Water by Graft Copolymerization of Acrylonitrile onto Date Palm Fiber Using H2O2/Fe++ as an Initiator

“…Where k 1 is the rate constant of pseudo-first-order adsorption (per minute) and qt and q e are the quantity of metal ions adsorbed (milligrams per gram) at time t, and equilibrium respectively [39,49]. The plots of log (q eq t ) versus t demonstrated in Figure (14), give the value rate constant k 1 and www.videleaf.com adsorption density q e from the slope and intercept respectively. Bad linearity was obtained for this model and it was clear from the values of correlation coefficients (R 2 ) which was low for different concentrations.…”

“…Recently many studies have focused on exploring an alternative metal adsorbent and grafted polymers. Grafting is the method in which functional monomers are covalently bonded to the backbone polymer chain [14][15][16][17]. Graft polymerization is significant as it permits implementing different functions of the grafted monomer on the parent polymer while retaining the mechanical features of the parent polymer.…”

Pre-irradiation grafting of acrylic acid and sodium styrene sulfonate on non-woven polyethylene fabric for heavy metal removal

“…The trunk polymer utilized to prepare metal adsorbent in present study is non-woven polyethylene. Numerous researches have reported elimination of toxic heavy metal ions by monomer grafted polyethylene (PE) [30][31][32][33][34]. In present study the preparation of a new adsorbent based on nonwoven PE fabric were attempted by radiation grafting technique using binary monomersacrylic acid (AAc) and sodium styrene sulfonate (SSS).…”