基于灰度的生物炭pH值与N和K离子吸附研究

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Abstract

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.

Key words： biochar RGB gray value pH cation adsorption

Received: 08 April 2018

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	Articles by authors
	WANG Ming-feng
	YANG Lu-han
	ZHANG Zheng-yan
	WU Xi-wen
	ZHONG Xuan
	JIANG En-cheng

Cite this article:

WANG Ming-feng,YANG Lu-han,ZHANG Zheng-yan等. Research on pH and adsorption properties of N and K cations of biochar based on gray value[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(11): 4141-4146.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I11/4141

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