TAILIEUCHUNG - Preparation of red mud graphene composite and its application for adsorption of As(III) from aqueous solution

In this study, we produce a red mud/graphene composite (REEG) via electrochemical activation graphite in basic red mud slurry. The adsorption properties for As(III) on REEG were investigated by batch method. The influence of pH (2-12), contact time (0-300 min), and the amount of adsorbent ( g) on As(III) removal efficiency by the REEG were also determined. | Vietnam Journal of Science and Technology 55 (4C) (2017) 217-223 PREPARATION OF RED MUD/GRAPHENE COMPOSITE AND ITS APPLICATION FOR ADSORPTION OF As(III) FROM AQUEOUS SOLUTION Ha Xuan Linh1, Hoang Duc Thuan1, Dang Thi Hong Phuong2, Nguyen Thi Thuy3, Nguyen Thanh Hai4, Nguyen Nhat Huy5, * Dang Van Thanh4, 6, * 1 TNU-Department of Administrative Affairs,Tan Thinh Ward, Thai Nguyen City 2 TNU-University of Agriculture and Forestry, Quyet Thang Ward, Thai Nguyen City 3 HCMC University of Food Industry, 140 Le Trong Tan Street, Tan Phu, Ho Chi Minh City 4 Research and Development Center for Advanced Technology, 21 Dao Tan Road, Ha Noi City 5 HCMC University of Technology, VNU-HCM, 268 Ly Thuong Kiet Street, Ho Chi Minh City 6 TNU-University of Medicine and Pharmacy, 284 Luong Ngoc Quyen Road, Thai Nguyen City * Email: thanhdv@, nnhuy@ Received: 1 August 2017; Accepted for publication: 15 October 2017 ABSTRACT In this study, we produce a red mud/graphene composite (REEG) via electrochemical activation graphite in basic red mud slurry. The adsorption properties for As(III) on REEG were investigated by batch method. The influence of pH (2-12), contact time (0-300 min), and the amount of adsorbent ( g) on As(III) removal efficiency by the REEG were also determined. Results showed that the equilibrium time, the optimal pH, and mass of adsorbent were 240 min, pH and g, respectively. The maximum adsorption capacity (qmax) calculated by Langmuir isotherm model was found to be mg/g. The results showed that REEG promises to be a good absorbent for As(III) removal from aqueous solution. Keywords: red mud; graphene; adsorption; arsenic; Langmuir. 1. INTRODUCTION Water pollution by arsenic is a worldwide problem mainly related to its extensive presence in water resources [1]. Arsenic appears in water due to a combination of natural processes, mainly dissolution of arsenic-containing rocks and soil, and anthropogenic sources

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