Mosoarca Giannin, Vancea Cosmin, Popa Simona, Boran Sorina
Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, Romania.
Materials (Basel). 2021 Oct 7;14(19):5861. doi: 10.3390/ma14195861.
A new natural adsorbent material, Bathurst burr powder, was used to remove crystal violet dye from synthetic wastewaters. Particle size distribution and SEM and FTIR analyses were performed to characterize it. The effect of the operational adsorption process parameters (pH, ionic strength, initial dye concentration, adsorbent dose, contact time, temperature) onto the adsorption process was evaluated in a batch system. Equilibrium, kinetic, and thermodynamic studies were performed in order to understand the adsorption process. Taguchi method and ANOVA test were used to optimize the dye adsorption conditions and to establish the percentage contribution of each factor, respectively. The accuracy of the Taguchi prediction method was analyzed by correlating the predicted dye removal efficiency with the experimentally determined one. The particle size distribution analysis showed that 82.15% of the adsorbent particles have an average size below 0.5 mm. The adsorption process followed the Langmuir isotherm and pseudo-second order kinetic model. Maximum adsorption capacity value (164.10 mg·g) was higher compared to many similar adsorbents. The process was endothermic, spontaneous, and favorably involving a physisorption mechanism. The Taguchi method showed that the most influential controllable factor was pH (65% contribution in adsorption efficiency) and the data analysis indicates a very good accuracy of the experimental design (R = 0.994). The obtained results demonstrated that Bathurst burr powder can be used as a cheap and efficient adsorbent for crystal violet dye removal from aqueous solution.
一种新型天然吸附材料——巴瑟斯特刺果粉末，被用于去除合成废水中的结晶紫染料。对其进行了粒度分布、扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）分析以对其进行表征。在间歇系统中评估了操作吸附过程参数（pH值、离子强度、初始染料浓度、吸附剂剂量、接触时间、温度）对吸附过程的影响。进行了平衡、动力学和热力学研究以了解吸附过程。分别使用田口方法和方差分析（ANOVA）测试来优化染料吸附条件并确定每个因素的贡献百分比。通过将预测的染料去除效率与实验测定的效率相关联，分析了田口预测方法的准确性。粒度分布分析表明，82.15%的吸附剂颗粒平均尺寸低于0.5毫米。吸附过程遵循朗缪尔等温线和准二级动力学模型。与许多类似吸附剂相比，最大吸附容量值（164.10毫克·克）更高。该过程是吸热的、自发的，且有利于物理吸附机制。田口方法表明，最具影响力的可控因素是pH值（对吸附效率的贡献为65%），数据分析表明实验设计具有非常好的准确性（R = 0.994）。所得结果表明，巴瑟斯特刺果粉末可作为一种廉价且高效的吸附剂，用于从水溶液中去除结晶紫染料。
