扬州大学学报（农业与生命科学版）2026，Vol.47Issue(3)：113-123,11.DOI:10.16872/j.cnki.1671-4652.2026.03.013
热解温度对茶树枝生物炭性能及其对铅、镉吸附能力的影响
The effect of pyrolysis temperature on the properties of tea branch biochar and its adsorption capacity for lead and cadmium
摘要
Abstract
Lead(Pb)and cadmium(Cd)have caused severe threats to aquatic environments due to industrial activities and the development of efficient and cost-effective adsorbent materials is an urgent task.In this study,tea tree branches,an agricultural waste,were used as the raw material to prepare biochar at different pyrolysis temperatures(300℃,400℃,and 500℃).The surface characteristics of the biochar were characterized using scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and X-ray diffraction(XRD)techniques.Adsorption kinetics and isotherm experiments were conducted to investigate the adsorption properties and mechanisms of biochar towards Pb2+and Cd2+.The results showed that the pyrolysis temperature significantly influenced the structural characteristics and adsorption performance of the biochar.As the pyrolysis temperature increased,the alka-linity and heavy metal adsorption capacity of the biochar were notably enhanced.The biochar prepared at 500℃ exhibited the best adsorption performance,with maximum adsorption capacities for Pb2+and Cd2+of 33.09 mg·g-1 and 6.28 mg·g-1,re-spectively.Kinetic analysis revealed that the adsorption process of the biochar was mainly controlled by chemical adsorp-tion,and the Langmuir isotherm model provided the best fit for the adsorption data.Adsorption mechanism studies indicated that the biochar primarily removed heavy metals through a mineral precipitation mechanism.In conclusion,this study demonstrates the promising application potential of tea tree branch biochar for the removal of Pb2+and Cd2+from aqueous solutions,providing new insights for the resource utilization of agricultural waste and the development of low-cost,effi-cient water treatment materials.关键词
农业废弃物/茶树枝/生物炭/重金属吸附/铅/镉Key words
agricultural waste/tea branch/biochar/heavy metals adsorption/lead/cadmium分类
资源环境引用本文复制引用
范嘉璐,王晶晶,尹微琴,王小治,徐乔..热解温度对茶树枝生物炭性能及其对铅、镉吸附能力的影响[J].扬州大学学报（农业与生命科学版）,2026,47(3):113-123,11.基金项目
扬州大学"青蓝工程"优秀青年骨干教师培养计划项目[扬大人资(2024-22)] （2024-22）
扬州大学教学改革研究课题立项支持项目(YZUJX2023-D10) （YZUJX2023-D10）
