Kinetics, equilibrium and thermodynamics studies on biosorption of Rhodamine B from aqueous solution by earthworm manure derived biochar
Kinetics, equilibrium and thermodynamics studies on biosorption of Rhodamine B from aqueous solution by earthworm manure derived biochar
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蚯蚓粪生物炭对水溶液中罗丹明 B 的生物吸附动力学、平衡和热力学研究
DOI：
10.1016/j.ibiod.2017.01.026
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发表时间：
2017-05
影响因子：
4.8
通讯作者：
Dekui Shen
中科院分区：
文献类型：
--
作者：
Zhanghong Wang;Dekui Shen
蚯蚓粪（EM）主要由蚯蚓堆肥产生，作为有机固体废物被广泛处理。在本研究中，EM在400-600°C下进行热解，制备一系列生物炭样品（EMCs）。研究了EMCs对罗丹明B （Rhodamine B， RB）的物理化学性质、吸附性能及潜在的吸附机理。n2吸附/解吸等温线和扫描电镜（SEM）分析表明，与原始EM相比，EMCs的比表面积和孔隙结构显著提高，并且在热解过程中保留了丰富的表面含氧官能团，如羟基（-OH）和羧基（-COOH），并大量生成芳香C=C基团，傅里叶变换红外光谱（FTIR）证实。结果表明，EMCs对RB有较好的吸附效果。Langmuir等温线模型可以很好地拟合平衡吸附数据，最大吸附量为14.49 ~ 21.60 mg g−1，而吸附动力学符合拟二级模型。热力学分析表明，吸附过程为自发吸热过程。发现EMCs表面含氧官能团和芳香C=C驱动的离子交换、氢键、静电相互作用和π-π堆积相互作用是吸附RB的主要原因。
Earthworm manure (EM) largely produced as vermicomposting is being widely disposed as organic solid waste. In this study, EM was pyrolyzed at 400–600 °C to prepare a series of biochar samples (EMCs). The physicochemical properties and adsorption capability to Rhodamine B (RB) using the EMCs as well as the underlying adsorption mechanism were thoroughly investigated. N2adsorption/desorption isotherms and scanning electron microscopy (SEM) analysis indicated that the specific surface area and porosity structure of the EMCs were significantly promoted compared with the raw EM. Also, abundant oxygen-containing surface functional groups like hydroxyl (-OH) and carboxyl (-COOH) were retained and aromatic C=C groups were largely generated in the EMCs after pyrolysis process, as evidenced by Fourier transform infrared spectroscopy (FTIR). The adsorption results showed that the EMCs were effective for RB adsorption. The equilibrium adsorption data could be well fitted by Langmuir isotherm model with a maximum adsorption capacity of 14.49–21.60 mg g−1, whereas the adsorption kinetics followed the pseudo-second-order model. Thermodynamic analysis revealed that the adsorption was assigned to a spontaneous and endothermic process. Ion exchange, hydrogen bonding, electrostatic interaction and π-π stacking interaction driven by oxygen-containing surface functional groups and aromatic C=C of EMCs were found to be responsible for RB adsorption.
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