改性鸡粪生物炭对化肥吸附性能的影响

Effect of Modified Chicken Manure Biochar on the Adsorption of Fertilizer

以畜禽粪便中典型的鸡粪为原料,在马弗炉中限氧500℃温度下制备生物炭,并对其微波加热和紫外线照射两种方式进行改性。通过pH、电导率、比表面积和傅里叶红外光谱对改性前后的鸡粪生物炭进行表征,结合吸附动力学模型和吸附等温线模型,探讨改性前后的鸡粪生物炭对化肥的吸附机理。结果表明,两种改性方法均使生物炭对化肥的吸附效果有所提升,其中经过微波加热改性的鸡粪生物炭对化肥的吸附量提升了1.65 mg/g,经过紫外改性的鸡粪生物炭对化肥的吸附量提升了2.44 mg/g;3种鸡粪生物炭对化肥的吸附过程均符合准二阶动力学模型和Langmuir模型,表明吸附过程中化学吸附占主导且为单层吸附。

In this paper,biochar was prepared from chicken manure in muffle furnace at 500℃oxygen limiting temperature,and modified by microwave heating and ultraviolet irradiation.The biochar was characterized by pH,electrical conductivity,specific surface area and Fourier infrared spectroscopy.The biochar was characterized by adsorption kinetics model and absorption isotherm model,the adsorption mechanism of biochar from chicken manure before and after modification was studied.The results showed that the adsorption capacity of biochar on fertilizer was increased by 1.65 mg/g,and the adsorption capacity of chicken manure biochar was increased by 1.65 mg/g,the adsorption capacity of the biochar modified by UV was increased by 2.44 mg/g,and the adsorption processes of the three biochars were all in accordance with the quasi-second-order kinetic model and Langmuir model,the results show that the chemical adsorption is dominant and monolayer adsorption.