Synthesis of Iron-Modified Biochar Derived from Rice Straw and Its Application to Arsenic Removal

• Main Authors: Thi Hanh Nguyen, Thi Huong Pham, Hong Tham Nguyen Thi, Thi Nham Nguyen, Minh-Viet Nguyen, Trinh Tran Dinh, Minh Phuong Nguyen, Trung Quang Do, Thao Phuong, Thu Trang Hoang, Thanh Tung Mai Hung, Viet Ha Tran Thi
• Format: Article
• Language: English
• Published: Hindawi Limited 2019-01-01
• Series: Journal of Chemistry
• Online Access: http://dx.doi.org/10.1155/2019/5295610

A novel iron-modified biochar (FMBC) derived from rice straw was synthesized using FeCl3 modification for efficient As(V) removal from aqueous solution. FTIR and SEM-EDX analyses were carried out to determine the mechanism involved in the removal process and also demonstrated that Fe had loaded successfully on the surface of modified biochar. The iron-modified biochar showed higher arsenic removal ability than the raw biochar. The iron-modified biochar showed a maximum adsorption with an initial solution pH of 5.0. Moreover, for the tested biochar, the As(V) removal kinetics data were well fitted by the pseudo-second-order model. Furthermore, the As(V) removal data upon being well fitted by the Langmuir model showed the maximal removal capacity of 28.49 mg/g. The simple preparation process and high adsorption performance suggest that the iron-modified biochar derived from rice straw could be served as an effective, inexpensive, and environmentally sustainable adsorbent to replace typical granular activated carbon (AC) for As(III) removal from aqueous solution.