Physicochemical Properties of Tomato Vine Biochar Prepared by Different Pyrolytic Temperatures
[Objective]Effect of processing temperature in pyrolysis of discarded tomato vines on the physiochemical properties of the resulting biochar was studied.[Methods]Biochar of waste tomato vines were prepared under the pyrolytic temperatures of 300℃,500℃,and 700℃for 2h.Surface characteristics,element,and functional groups of the biochar were examined by means of electron microscope scanning,elemental analysis,and Fourier transform infrared spectrometer.[Results]The biochar prepared under different pyrolytic temperatures had a pH ranging 9.83-10.67.High process temperature reduced the yield but increased the ash content of the biochar.At 500℃,the biochar had the least amount of total nitrogen,but the highest at 300℃.At 500℃,the fixed carbon content peaked at 51.42%,and the C/N ratio at 36.63.More pores appeared on the biochar made by a lower than a higher temperature,under which ash and/or molten elements tended to cover the surface reducing the porosity.A high pyrolytic temperature,comparing 700℃to 300℃or 500℃,also raised the aromatization,as shown by the declined Fourier transform infrared spectroscopy spectrum absorption,especially at 500-800cm-1 region.[Conclusion]The temperature applied in pyrolysis affected the physics,chemistry,and microstructure of the tomato vine biochar.Overall,a pyrolysis process of 300-500℃for 2 h appeared to deliver desirable results.
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万方数据
维普
