Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (6): 1132.doi: 10.7503/cjcu20170796

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Highly Efficient Utilization of Rice Husk Char to Prepare Carbon Adsorbent and Calcium Silicate

CHENG Yanyan, SUI Guanghui, CHEN Zhimin, LIU Huan, DUAN Yajun, WANG Xiaofeng, YANG Xiaomin*(), WANG Zichen   

  1. College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2017-12-08 Online:2018-06-10 Published:2018-05-15
  • Contact: YANG Xiaomin E-mail:xmyang@jlu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No. 51502108), the Foundation of Jilin Province Development and Reform Commission, China(No.2014N145) and the Development Project of Science and Technology of Jilin Province, China(No.20150520016JH).

Abstract:

A highly efficient method for the comprehensive utilization of rice husk pyrolysis char was reported. Rice husk pyrolysis char was used as C and Si resource. C and Si in rice husk pyrolysis char were separated via the reaction of rice husk pyrolysis char and sodium hydroxide to form carbonaceous matter and sodium silicate. Carbonaceous matter was activated into adsorbent carbon by surface modification of alkali solution. Sodium silicate was converted into calcium silicate by the reaction with calcium oxide. The sodium hydroxide solution was recycled. The adsorption performance of the adsorbent carbon was investigated by the decolourization ratio of malachite green solution. The results show that the decolourization ratio of malachite green solution can achieve 99.9% under the optimized conditions(pH=7, 30 ℃, 60 min). The structures of calcium silicate prepared at different temperatures and Ca/Si ratios were studied by X-ray diffraction. The results show that the structure of calcium silicate is associated with the Ca/Si ratio and heating treatment temperature. αL'-Ca2SiO4 was obtained when the Ca/Si molar ratio was 3 and the heating treatment temperature was 800 ℃. Effect of Ca/Si molar ratio, reaction temperature and time on the recovery rate of alkaline was investigated by statistical method. The influence order is Ca/Si molar ratio> temperature > time. The recovery rate of alkaline can reach 100% under the optimized conditions(Ca/Si molar ratio of 3, 90 ℃, 1 h).

Key words: Biomass comprehensive utilization, Rice husk pyrolysis char, Rice husk based porous carbon, Absorbent, Calcium silicate, Alkali recovery

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