化工进展2024，Vol.43Issue(z1)：650-661,12.DOI:10.16085/j.issn.1000-6613.2024-0813
油页岩灰基分子筛的制备及对亚甲基蓝的吸附
Synthesis and methyl blue adsorption performance of oil shale ash-based zeolites
摘要
Abstract
The structure-function relationship between the type and structure of the oil shale ash-based zeolite and its ability to adsorb dyes is unclear.NaP1,NaX and NaA zeolites were prepared from Beipiao oil shale ash(BPA)and used to adsorb methylene blue(MB).The effects of zeolite dosage,initial MB concentration,pH,adsorption temperature and time on the MB adsorption performance were investigated,and the adsorption mechanism was revealed.The structure-function relationship between the type of zeolite and its ability to adsorb MB was explored.The results showed that the specific surface area and pore structure of the zeolite have great effects on its adsorption capacity.Under the optimal adsorption conditions,the MB removal percentages by NaP1,NaX and NaA zeolites are 99.7％,94.5％and 96.5％,respectively.The synthesized zeolites have excellent recyclability.The adsorption processes conform to the pseudo-second-order kinetic and the Langmuir isothermal adsorption models.The adsorption thermodynamics results show that the MB adsorption on the NaP1 zeolite is a spontaneous endothermic process of increased entropy while that on the NaX and NaA zeolites is a spontaneous exothermic process of decreased entropy.The study of adsorption mechanism showed that electrostatic attraction,hydrogen bond and pore diffusion are the main driving forces during the MB adsorption on the zeolites.This work can provide valuable practical and theoretical reference for the efficient utilization of oil shale ash and low-cost treatment of dyeing wastewater by adsorption method.关键词
油页岩灰/分子筛/亚甲基蓝/吸附机理/构效关系Key words
oil shale ash/zeolite/methylene blue/adsorption mechanism/structure-function relationship分类
化学化工引用本文复制引用
石磊,王倩,赵晓胜,刘宏臣,车远军,段玉,李庆..油页岩灰基分子筛的制备及对亚甲基蓝的吸附[J].化工进展,2024,43(z1):650-661,12.基金项目
国家自然科学基金(22008187,22208256,22308269). （22008187,22208256,22308269）
