芹菜源生物炭对重金属离子的吸附性能

目的]寻找高效低成本的吸附重金属污染物的材料。方法]以农业剩余物芹菜为原料,研究芹菜源生物炭对一些典型重金属离子Cu2+、Cd2+、Cr(VI)]的吸附性能。结果]中温(350、500℃)限氧热解制备的芹菜源生物炭对Cu2+的吸附量可超过50 mg/g,对Cd2+、Cr(VI)等重金属离子也表现出良好的吸附性能。Freundlich和Langmuir吸附方程能较好地描述吸附过程。结合红外光谱、扫描电镜与能谱等表征手段,证明芹菜源生物炭对重金属离子的高吸附性能与其表面沉淀作用、表面络合和离子交换反应有关。结论]芹菜源生物炭对重金属离子有较强的吸附性能,应用前景广阔。

Adsorption Performance of Biochars Derived from Celery Biomass for Heavy Metals

Objective]To find efficient and low-cost adsorption materials to remove heavy metal pollutants.Method]Taking celery as the raw material, the adsorption properties of biochars derived from Celery biomass on some typical heavy metal ions Cu2+, Cd2+, Cr (VI)] were studied.Result]The results showed that the biochars obtained by oxygen limited pyrolysis of celery biomass in mesotherm(350、500℃)can adsorb Cu2+ with a capacity of more than 50 mg/g, and also exhibited good adsorption to Cd2+ and Cr(VI) ions.The adsorption process can be well described by Freundlich and Langmuir adsorption equations.The high adsorption of biochars derived from celery biomass to heavy metal ions was discussed by combining infrared spectra, scanning electronic microscope and energy-dispersing spectra, and was related to its surface precipitation, complexation and ion exchange.Conclusion]Biochars derived from celery biomas has strong adsorption properties to heavy metal ions, and has broad application prospects.