Research on pH and adsorption properties of N and K cations of biochar based on gray value
WANG Ming-feng, YANG Lu-han, ZHANG Zheng-yan, WU Xi-wen, ZHONG Xuan, JIANG En-cheng
Key laboratory of Ministry of Agriculture Energy Plant Resources and the Use, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
According to statistics of the past 40years, average fertilizer use efficiency is only about 50%. The low fertilizer efficiency not only causes energy loss but also causes environmental pollution and ground and surface water contamination. A new fertilizer using biochar as carrier has a great potential to solve this issue. In this research, the biochars made from rice husk, cassava straw and corn stover were obtained by a horizontal fixed bed quartz tube pyrolysis reactor with varied temperatures (350, 450, 500, 550, and 600℃). The RGB values and corresponding gray value of these biochars were analyzed by image recognition technology. The relationship between pH and gray value and the relationship between adsorption capacities of N and K cations (NH4+-N and K+-K,) and gray value were studied. In general, the pH value of biochar increased as gray value increased with R2 of 0.9766, 0.9592, and 0.9219, respectively, and the trend fitted well with the DoseResp model. NH4+-N and K+-K adsorption capacity of those three biochars followed the one-dimensional high-order nonlinear models with R2 ranged from 0.8595 to 0.9999, except the negative linear correlation between K+-K adsorption capacity and gray value for corn stover. This study provides theoretical basis for development of rapid method to predict pH and cation adsorption properties of biochar, and also has a potential to develop portable equipment for online testing.
王明峰, 杨璐菡, 张争艳, 吴西文, 钟旋, 蒋恩臣. 基于灰度的生物炭pH值与N和K离子吸附研究[J]. 中国环境科学, 2018, 38(11): 4141-4146.
WANG Ming-feng, YANG Lu-han, ZHANG Zheng-yan, WU Xi-wen, ZHONG Xuan, JIANG En-cheng. Research on pH and adsorption properties of N and K cations of biochar based on gray value. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(11): 4141-4146.
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