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以农业废弃物花椰菜的根和叶为原材料,采用限氧裂解法在500℃条件下制备花椰菜根基生物炭(BCR)和叶基生物炭(BCL),探究了吸附时间、温度、Pb(Ⅱ)初始浓度、pH及不同共存离子对2种生物炭吸附性能的影响,并通过扫描电镜(SEM)、能谱分析(EDS)、红外光谱(FTIR)及比表面积测定(BET)等手段对生物炭的结构和性质进行了表征,初步探讨了吸附机理.结果表明,2种生物炭对Pb(Ⅱ)的吸附符合准二级动力学和颗粒内扩散模型,BCR和BCL对Pb(Ⅱ)的吸附分别在3 h和6 h达到吸附平衡;2种生物炭对不同浓度下Pb(Ⅱ)的吸附符合Langmuir和Freundlich等温吸附模型;在25℃条件下,BCR和BCL对Pb(Ⅱ)的最大吸附量分别达到454.55和434.78 mg·g~(-1),BCR和BCL具有良好的吸附效果,可作为优良的生物质基吸附材料.
The roots and leaves of agricultural waste cauliflower were used as raw materials to prepare cauliflower biocoke (BCR) and leaf - based biochar (BCL) at 500 ℃ using oxygen - limited pyrolysis method. The effects of adsorption time, temperature, The effects of initial concentration, pH and different coexisting ions on the biochar adsorption performance were investigated. The effects of biochar on the biochar adsorption properties were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), infrared spectroscopy (FTIR) and BET The results showed that the adsorption of Pb (Ⅱ) by two kinds of biochar was in accordance with the quasi - second order kinetics and intragranular diffusion model, and the adsorption of Pb (Ⅱ) by BCR and BCL Respectively. The adsorption of Pb (Ⅱ) by two kinds of biochar was in accordance with the Langmuir and Freundlich isotherm models. The maximum adsorption of Pb (Ⅱ) by BCR and BCL at 25 ℃ The quantities of BCR and BCL reached 454.55 and 434.78 mg · g -1, respectively. BCR and BCL had good adsorption capacity and could be used as excellent biomass-based adsorbents.