Study on the Physical and Chemical Properties of Forestry-waste Biochar under Different Raw Material Sources and Pyrolysis Temperature
Forestry-waste is regarded as an ideal raw material for biochar preparation because of its environmentally friendly characteristics and wide distribution.In order to realize the multistage utilization of forestry-waste,give full play to its renewable characteristics.In this study,the biochar was prepared from Populus alba×P.berolinensis leaves,Pinus sylvestris var.mongolica leaves,Populus alba×P.berolinensis branches,and Pinus sylvestris var.mongolica.branches under anaerobic conditions at 300,500 and 700℃.And then using SEM,XRD and XPS to explore the influence of different raw material sources and pyrolysis temperature on the properties of forestry-waste biochar,and provide a reference for the high-value utilization of forestry-waste.The results show that the pH of biochar is alkaline.With the increase of pyrolysis temperature,the four kinds of biochar have the same pattern of change,all of which are the decrease of average pore size,the increase of specific surface area and total pore volume.The total amount of acidic oxygen-containing functional groups(-OH,C-OOH,O=C-O and-COOR)on the surface of biochar also decreases with the increase of pyrolysis temperature,and the biochar becomes more aromatic and less polar and hydrophilic.Leaf biochar has higher ash content and CaCO3 content;while branch biochar has higher aromatic degree,hydrophobicity and weaker polarity.The surface of biochar from Populus alba×P.berolinensis has abundant C-C,which is more aromatic than the biochar from Pinus sylvestris var.mongolica.Therefore,the raw material source and pyrolysis temperature have significant impacts on the physical and chemical properties of forestry-waste biochar.
biocharforestry-wastephysicochemical propertiessource of raw materialspyrolysis temperature
万方数据
维普
