4.7 Article

Adsorption of NH3-N onto rice straw-derived biochar

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ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2019.103039

关键词

Adsorption; Agricultural waste; Biochar; NH3-N; Recycle; Rice straw

资金

  1. Science and Technology Support Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT(MSIT) [2019K1A3A9A01000029]
  2. BK21 PLUS research program of the National Research Foundation of Korea
  3. National Research Foundation of Korea [2019K1A3A9A01000029] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this study, potential of rice straw-derived biochar as an NH3-N was evaluated. The aims of this study are to evaluate the NH3-N adsorption kinetics, examine NH3-N adsorption capacity, suggest the optimal pyrolysis temperature for NH3-N removal, and investigate the effect of solution pH on the NH3-N removal by rice straw-derived biochar. In order to achieve these goals, series of experiments on NH3-N adsorption by rice straw-derived biochar specimens obtained at four different temperatures (300, 400, 500, and 600 degrees C) were conducted. The results show that more than half of mass transfer was finished in 2 h, and this ensures feasibility for in-situ operation. According to the adsorption isotherm experiments, NH3-N adsorption capacity by rice straw-derived biochar increased with initial NH3-N concentration and it seems to result from multilayer adsorption behaviors. The optimal pyrolysis temperature for NH3-N removal was around 400 degrees C. It seems that enlargement of surface area compensated the dissipation of functional groups associated with NH3-N removal. The influence of pH on NH3-N removal was distinguished depending on the pyrolysis temperature. Adsorption envelopes of NH3-N by BC300 and BC400 resembled those of common cationic species, however those of BC500 and BC600 showed different patterns. Solution pH should be carefully managed for NH3-N adsorption process by rice straw-derived biochar.

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