In this study, crumpled graphite oxides (CGOs) were fabricated from graphite electrode of exhausted dry batteries (RG) by cathodic plasma electrolysis method (CPE) and applied for removing Cd(II) from aqueous solutions. | Vietnam Journal of Science and Technology 55 (4C) (2017) 8-13 REMOVAL OF Cd(II) FROM AQUEOUS SOLUTIONS BY CRUMPLED GRAPHITE OXIDE Ha Xuan Son1, Hac Van Vinh1, Nguyen Thanh Hai1, Dang Thi Hong Phuong2, Nguyen Thi Kim Ngan3, Pham Van Hao4, Dang Nhat Minh5, Dang Van Thanh1,*, Phan Ngoc Hong5,6,*, Phan Ngoc Minh6 1 TNU - University of Medicine and Pharmacy, 284 Luong Ngoc Quyen, Thai Nguyen, Viet Nam 2 TNU - University of Agriculture and Forestry, Quyet Thang ward, Thai Nguyen, Viet Nam 3 TNU - University of Science, Thai Nguyen University, Tan Thinh, Thai Nguyen, Viet Nam 4 TNU - University of Information and Communication Technology, Tan Thinh ward, Thai Nguyen City, Viet Nam 5 Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam 6 Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam * Email: hongpn@, thanhdv@ Received: 8 August 2017; Accepted for publication: 15 October 2017 ABSTRACT In this study, crumpled graphite oxides (CGOs) were fabricated from graphite electrode of exhausted dry batteries (RG) by cathodic plasma electrolysis method (CPE) and applied for removing Cd(II) from aqueous solutions. The effects of pH, contact time, and initial concentrations on the removal of Cd(II) ions were studied. A removal efficiency of ∼98 % was obtained after 120 min, via the dispersion of 15 mg of CGO in Cd(II) solutions (40 mL, 1 ppm) at pH 6. The maximum adsorption capacity (qmax) was calculated to be mg/g. Results showed that CGO is an effective adsorbent for the removal of Cd(II) from aqueous environment and acts as a promising adsorbent for the removal of other heavy metals from the polluted water. Keywords: adsorption; cadmium, graphite oxides, plasma electrolysis. 1. INTRODUCTION Cadmium is a highly toxic heavy metal, which is usually found in sewage sludge, industrial wastes from metallization, and production of batteries, pesticides, paints, colored
