Zhou Junxia, Li Mengjie, Tao Yu, Zha Lanchang
School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China.
Ordos Institute of Liaoning Technical University, Ordos 017004, China.
Molecules. 2025 Feb 21;30(5):992. doi: 10.3390/molecules30050992.
Aiming at the pollution problem of methylene blue dye wastewater, a new type of methylene blue adsorbent magnesium-modified fly ash (Mg@FA) was prepared by using solid waste fly ash as raw material. The effects of Mg@FA dosage, adsorption time, and methylene blue concentration on the adsorption of methylene blue by Mg@FA and pH values were analyzed. The adsorption characteristics of Mg@FA on methylene blue were investigated by adsorption kinetics, adsorption isotherms, and adsorption thermodynamics, as well as SEM, EDS, XRD, BET, and FTIR. The results showed that when the dosage of Mg@FA was 1.0 g, the adsorption time was 120 min, and the initial concentration of methylene blue was 150 mg/L; the adsorption efficiency of methylene blue by Mg@FA was the highest, which was 95.61%. When the pH of the methylene blue solution was in the range of 7-11, the adsorption efficiency of Mg@FA for methylene blue remained stable at 95.61-98.10%. The adsorption process of methylene blue by Mg@FA follows the second-order kinetic fitting model and Langmuir model. The adsorption of methylene blue by Mg@FA is a spontaneous and endothermic reaction. Mg@FA adsorbs methylene blue through electrostatic interaction and hydrogen bonding. Mg@FA can effectively adsorb methylene blue and promote the waste utilization of fly ash, which provides a promising method for wastewater treatment and fly ash utilization.
针对亚甲基蓝染料废水的污染问题，以固体废弃物粉煤灰为原料制备了一种新型亚甲基蓝吸附剂镁改性粉煤灰（Mg@FA）。分析了Mg@FA投加量、吸附时间、亚甲基蓝浓度对Mg@FA吸附亚甲基蓝的影响以及pH值的影响。通过吸附动力学、吸附等温线、吸附热力学以及扫描电子显微镜（SEM）、能谱仪（EDS）、X射线衍射仪（XRD）、比表面积分析仪（BET）和傅里叶变换红外光谱仪（FTIR）研究了Mg@FA对亚甲基蓝的吸附特性。结果表明，当Mg@FA投加量为1.0 g、吸附时间为120 min、亚甲基蓝初始浓度为150 mg/L时，Mg@FA对亚甲基蓝的吸附效率最高，为95.61%。当亚甲基蓝溶液的pH值在711范围内时，Mg@FA对亚甲基蓝的吸附效率稳定在95.61%98.10%。Mg@FA吸附亚甲基蓝的过程遵循二级动力学拟合模型和朗缪尔模型。Mg@FA对亚甲基蓝的吸附是一个自发的吸热反应。Mg@FA通过静电作用和氢键吸附亚甲基蓝。Mg@FA能有效吸附亚甲基蓝并促进粉煤灰的废物利用，为废水处理和粉煤灰利用提供了一种有前景的方法。
