Wang Yihan, Dong Yanrong, Shao Junli, Zhao Zilong, Zhai Hongyu
College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China.
College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China.
Molecules. 2024 May 7;29(10):2183. doi: 10.3390/molecules29102183.
Efficient and thorough treatment of dye wastewater is essential to achieve ecological harmony. In this study, a new type of calcium-based modified coal gangue (Ca-CG) was prepared by using solid waste coal gangue as raw material and a CaCl modifier, which was used for the removal of malachite green, methylene blue, crystal violet, methyl violet and other dyes in water. When the dosage of Ca-CG was 1-5 g/L, the dosage of Ca-CG was the main factor affecting the dye adsorption effect. The adsorption effects of Ca-CG on four dyes were as follows: malachite green > crystal violet > methylene blue > methyl violet. Kinetics, isotherms and thermodynamic analysis showed that the adsorption of malachite green, methyl blue, crystal violet and methyl violet by Ca-CG fitted the second-order kinetic model, and adsorption with chemical reaction is the main process. The adsorption of four dyes by Ca-CG conformed to the Freundlich model, which is dominated by multi-molecular layer adsorption, and the adsorption was easy to carry out. The adsorption process of Ca-CG on the four dyes was spontaneous. The results of FTIR, XRD and SEM showed that the calcium-based materials such as lipscombite and dolomite were the key to the adsorption of malachite green by Ca-CG, and the main mechanisms for the adsorption of malachite green by Ca-CG are surface precipitation, electrostatic action, and chelation reaction. Ca-CG adsorption has great potential for the removal of dye wastewater.
高效且彻底地处理染料废水对于实现生态和谐至关重要。在本研究中，以固体废弃物煤矸石为原料，采用氯化钙改性剂制备了一种新型钙基改性煤矸石（Ca-CG），用于去除水中的孔雀石绿、亚甲基蓝、结晶紫、甲基紫等染料。当Ca-CG投加量为1 - 5 g/L时，Ca-CG投加量是影响染料吸附效果的主要因素。Ca-CG对四种染料的吸附效果依次为：孔雀石绿＞结晶紫＞亚甲基蓝＞甲基紫。动力学、等温线及热力学分析表明，Ca-CG对孔雀石绿、亚甲基蓝、结晶紫和甲基紫的吸附符合二级动力学模型，且以化学反应吸附为主过程。Ca-CG对四种染料的吸附符合Freundlich模型，以多分子层吸附为主，吸附易于进行。Ca-CG对四种染料的吸附过程是自发的。傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）结果表明，钙镁石和白云石等钙基材料是Ca-CG吸附孔雀石绿的关键，Ca-CG吸附孔雀石绿的主要机制为表面沉淀、静电作用和螯合反应。Ca-CG吸附在去除染料废水方面具有巨大潜力。
