碳纤维负载硅酸镁铝的制备及其吸附DSP聚醚中过渡金属离子性能OA

This study focuses on the challenge of efficiently removing transition metal ion impurities present in DSP polyethers used in advanced integrated circuit manufacturing processes.It aims to develop a novel composite material that exhibits high adsorption performance,easy separation and recovery,and excellent cycling stability.Traditional powdered magnesium aluminosilicate(MAS)adsorbents suffer from limitations such as a tendency to agglomerate and difficulties in recovery during application.To address these issues,this study employed a strategy combining nitric acid oxidation pretreatment with hydrothermal synthesis to successfully load MAS onto the surface of carbon fibers(CF),thereby preparing CF-MAS fiber composite adsorbent materials. The materials were characterized using SEM,FTIR,XRD and BET.The results indicate that the hydrothermal method enabled uniform loading of MAS onto the CF surface.The composite retained the porous structure and characteristic functional groups of MAS while the fibrous skeleton of CF remained intact.Under optimal preparation conditions(hydrothermal temperature of 160℃and time of 16 h),the obtained CF-MAS material exhibited a specific surface area of 297.3 m2/g and a pore volume of 0.33 cm3/g,providing abundant pore structure and active sites.Adsorption performance tests showed that under optimized conditions(adsorbent dosage of 50 mg,solution pH 2-6,adsorption time of 30 min,temperature of 25℃),CF-MAS achieved a removal rate of 99.9%for Cu(Ⅱ)with an adsorption capacity of 9.6 mg/g.The material maintained stable adsorption performance across a wide acidic range,demonstrating good acid resistance.Cycling experiments further revealed that after eight adsorption-desorption cycles,the removal rate for Cu(Ⅱ)remained above 90.2%,indicating excellent regeneration capability and potential for repeated use.In simulated DSP polyether aqueous solutions representing practical systems,CF-MAS achieved removal rates exceeding 96.33%for Fe(Ⅲ),Cu(Ⅱ)and Zn(Ⅱ),with adsorption capacities above 8.67 mg/g,confirming its efficient and stable adsorption capability in complex environments.Kinetic fitting analysis indicated that the adsorption process better conformed to the pseudo-second-order kinetic model,suggesting that chemical adsorption played a dominant role.The isothermal adsorption data showed good agreement with the Langmuir model,confirming that the adsorption followed a monolayer mechanism with a relatively uniform distribution of surface active sites.Based on the combined structural characterization and adsorption experimental results,it is inferred that the adsorption mechanism of CF-MAS for transition metal ions involves surface electrostatic attraction,physical adsorption within pores,and chemical complexation through active groups such as surface hydroxyls,with chemical adsorption serving as the primary mechanism. The CF-MAS composite adsorbent material developed in this study offers a straightforward preparation method and possesses multiple advantages,including high adsorption capacity,good structural stability,easy recovery,and reusability.It thus presents a feasible material-based solution for the efficient removal of transition metal ion impurities from DSP polyether systems.