Biochar was prepared from rice straw using hydrothermal carbonization method which consisted of zinc chloride treatment. The effects of hydrothermal temperature, time and biomass/water rate on methylene blue removal from aqueous solution were investigated. Besides, response surface modeling (RSM) and the central composite design – face centered (CCF) method will be used in designing experiments. | Journal of Science and Technology 55 (1B) (2017) 223–229 EFFECT OF PREPARATION CONDITIONS OF BIOCHAR FROM RICE STRAW BY HYDROTHERMAL CARBONIZATION Ngoc Bich Nguyen1, 2, *, Cao Thanh Tung Pham1, 3, Dinh Thanh Nguyen1, 4 1 Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Nghia Do Ward, Cau Giay District, Ha Noi, Vietnam 2 Centre of Chemical Analysis, Dong Thap University 783 Pham Huu Lau Street, Ward 6, Cao Lanh City, Dong Thap Province, Viet Nam 3 4 Institute of Chemical Engineering, Viet Nam Academy of Science and Technology 1 Mac Dinh Chi Street, Ben Nghe Ward, District 1, Ho Chi Minh City, Vietnam Institute of Applied Material Science, Viet Nam Academy of Science and Technology 1 Mac Dinh Chi Street, Ward 14, District 1, Ho Chi Minh City, Vietnam * Email: nnbich2906@ Received: 30 December 2016; Accepted for publication: 6 March 2017 ABSTRACT Biochar was prepared from rice straw using hydrothermal carbonization method which consisted of zinc chloride treatment. The effects of hydrothermal temperature, time and biomass/water rate on methylene blue removal from aqueous solution were investigated. Besides, response surface modeling (RSM) and the central composite design – face centered (CCF) method will be used in designing experiments. It was found that the optimal conditions for high efficiency of biochar were such that: temperature of °C, hours and biomass/water ratio of 10 wt%, which resulted methylene blue removal of %. Keywords: hydrothermal carbonization, biochar, rice straw, methylene blue. 1. INTRODUCTION Agricultural waste would be an attractive starting precursor for carbonaceous materials because of its abundance, low cost, excellent properties and special structures [1, 2]. Accordingly, numerous carbonaceous materials derived from renewable biomass have been reported, and some of them were applied in water purification [3]. In addition, most of .
