Oxidation of carbon nanotubes using for Cu(II) adsorption from aqueous solution

• Main Authors: Nguyen Duc Vu Quyen, Tran Ngoc Tuyen, Dinh Quang Khieu, Dang Xuan Tin, Bui Thi Hoang Diem, Nguyen Thi My Tinh, Pham Thi Ngoc Lan
• Format: Article
• Language: English
• Published: HUJOS 2019-06-01
• Series: Tạp chí Khoa học Đại học Huế: Khoa học Tự nhiên
• Subjects: oxidized carbon nanotubes; cuii adsorption capacity; cuii adsorption; potassium permanganate; oxidized cnts.
• Online Access: http://jos.hueuni.edu.vn/index.php/HUJOS-NS/article/view/5216

Carbon nanotubes (CNTs) synthesized by chemical vapour deposition without using hydrogen were oxidized with 0.1 M potassium permanganate at 40oC for 2 hours and exhibited high CuII adsorption capacity from aqueous solution. X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscope (SEM), transmission electron microscope (TEM) and nitrogen adsorption/desorption isotherms were used to characterize the oxidized CNTs. After oxidizing, the obtained CNTs were used to remove CuII from aqueous solution. With CuII initial concentration of 20 mg.L-1, at pH of 4 and adsorbent dosage of 0.2 g.L-1, the oxidized CNTs exhibited high CuII adsorption ability with maximum adsorption capacity of 174.4 mg.g-1.