油茶果壳生物炭对氮磷污染物的吸附性能研究

Study on adsorption properties of nitrogen and phosphorus pollutants by biochar from Camellia oleifera fruit shells

为了寻求农林废弃物的资源化利用途径和开发低成本、高效的氮磷污染物吸附剂,本研究以油茶果壳为原料,制备生物炭应用于氮磷污染物的吸附特性研究。结果表明,热解温度为300℃的油茶果壳炭孔隙结构发达,含氧官能团丰富,有利于氮磷污染物的吸附;当生物炭投加量为0.01g、NH4Cl和KH2PO4的浓度为100mg·L^(-1)、pH值为8时,吸附效果最好,NH4+吸附量为66.9mg·g^(-1),PO43-吸附量为193.76mg·g^(-1)。油茶果壳炭对氮磷污染物的吸附过程更符合准一级动力学模型和Langmuir等温模型。

In order to explore the way of resource utilization of agricultural and forestry wastes and develop low cost and high efficiency adsorbents for nitrogen and phosphorus pollutants,this study used Camellia oleifera fruit shells as raw material to prepare biochar for nitrogen and phosphorus pollutants adsorption.The results showed that the pore structure of biochar with the pyrolysis temperature of 300℃was developed,and oxygen-containing functional groups of biochar was abundant,which was conducive to the adsorption of nitrogen and phosphorus pollutants.When the dosage of biochar was 0.01g,the concentration of ammonium chloride and potassium dihydrogen phosphate was 100mg·L^(-1),and the pH value was 8,the adsorption effect was the best.The adsorption capacity of ammonium ion and phosphate ion were 66.9mg·g^(-1)and 193.76mg·g^(-1),respectively.The adsorption process of nitrogen and phosphorus pollutants by biochar was more consistent with the quasi-first-order kinetic model and Langmuir isothermal model.