Synthesis of Poly(hydroxamic acid) Ligand from Polymer Grafted Khaya Cellulose for Transition Metals Extraction

• Main Authors: Lutfor, M. R., Manda, Bablu Hira, Sarkar, Shaheen M., Nor Asiken, Abdul Wahab, M. M., Yusoff, Sazmal E., Arshad, Musta, Baba
• Format: Article
• Language: English
• Published: The Korean Fiber Society 2016
• Subjects: QD Chemistry
• Online Access: http://umpir.ump.edu.my/id/eprint/16780/1/fist-2016-lutfor-Synthesis%20of%20Poly%28hydroxamic%20acid1.pdf; http://umpir.ump.edu.my/id/eprint/16780/; http://dx.doi.org/10.1007/s12221-016-6001-2

A cellulose-graft-poly(methyl acrylate) was synthesized by free radical initiating process and the ester functional groups were converted into the hydroxamic acid ligand. The intermediate and final products are characterized by FT-IR, FESEM, HR-TEM and XPS technique. The pH of the solution acts as a key factor in achieving optical color signals of metalcomplexation. The reflectance spectra of the[Cu-ligand]n+ complex was found to be a highest absorbance at 99.8 % at pH 6 and it was increased upon increasing of Cu2+ ion concentrations and a broad peak at 700 nm was observed which indicated the charge transfer (π-π transition) metals-Cu complex. The adsorption capacity of copper was found to be superior (336 mg g-1)rather than other transition metals such as Fe3+, Co3+, Cr3+, Ni2+, Mn2+ and Zn2+ were 310, 295, 288, 250, 248 and 225 mg g-1, respectively at pH 6. The experimental data of all metal ions fitted significantly with the pseudo-second-order rate equation. The transition metal ions sorption onto ligand were well fitted with the Langmuir isotherm model (R2>0.99), which suggested that the cellulose-based adsorbent known as poly(hydroxamic acid) ligand surface is homogenous and monolayer. The reusability of the poly(hydroxamic acid) ligand was checked by the sorption/desorption process up to ten cycles without any significant loss in its original sensing and removal performances.