Tulashie Samuel Kofi, Kotoka Francis, Botchway Bennett Nana, Adu Kofi
University of Cape Coast, College of Agriculture and Natural Sciences, School of Physical Sciences, Department of Chemistry, Industrial Chemistry Unit, Cape Coast, Ghana.
University of Cape Coast, College of Agriculture and Natural Sciences, School of Physical Sciences, Department of Physics, Industrial Chemistry Unit, Cape Coast, Ghana.
Heliyon. 2022 Oct 3;8(10):e10908. doi: 10.1016/j.heliyon.2022.e10908. eCollection 2022 Oct.
We assess the adsorption capacity of bamboo and calabash biochar (BB and CB). Using 10-50 mg/L Reactive Violet 5 Azo dye (V5R) adsorbate, the kinetics, and adsorption isotherms are investigated. We pyrolyzed the bamboo, and calabash biomass at 500 °C, washed, and oven dried at 120 °C for 48 h. The Brunauer-Emmett-Teller (BET) method indicates that the BB and CB average pore diameters are 21.1 nm and 26.5 nm, with specific surface areas of 174.67 m/g and 44.78 m/g, respectively. The SEM reveals a larger granular shape of the CB having pinholes on the surface, but the BB exhibited interconnected structures like a mesh. The FTIR shows C=C, C=O, O-H, and C-O-C as the predominant functional groups on both BB and CB. The adsorption of V5R on BB and CB follows pseudo-second-order kinetics and favors Langmuir isotherm with maximum adsorption capacities of 5.106 mg/g, and 0.010 mg/g, respectively. The BB adsorbs 70.9-96% V5R, whilst CB adsorbs 0.1-0.2 % only. The results suggest that bamboo biochar has the potential to eliminate 70.9-96% of 10-50 mg/L V5R from an aqueous solution, hence suitable for removing V5R. In this study, we have also presented a prototype expected to eliminate 91.6%-99.8% of the V5R from an aqueous solution.
我们评估了竹炭和葫芦炭（BB和CB）的吸附能力。使用浓度为10 - 50 mg/L的活性紫5偶氮染料（V5R）吸附质，研究了其动力学和吸附等温线。我们将竹子和葫芦生物质在500℃下热解，洗涤后在120℃烘箱中干燥48小时。布鲁诺尔-埃米特-泰勒（BET）方法表明，BB和CB的平均孔径分别为21.1 nm和26.5 nm，比表面积分别为174.67 m²/g和44.78 m²/g。扫描电子显微镜（SEM）显示CB呈较大的颗粒状，表面有针孔，而BB呈现出类似网状的相互连接结构。傅里叶变换红外光谱（FTIR）表明，C = C、C = O、O - H和C - O - C是BB和CB上的主要官能团。V5R在BB和CB上的吸附遵循准二级动力学，且符合朗缪尔等温线，最大吸附容量分别为5.106 mg/g和0.010 mg/g。BB吸附70.9 - 96%的V5R，而CB仅吸附0.1 - 0.2%。结果表明，竹炭有潜力从水溶液中去除70.9 - 96%的10 - 50 mg/L V5R，因此适用于去除V5R。在本研究中，我们还展示了一个原型，预计可从水溶液中去除91.6% - 99.8%的V5R。
