Investigation of performance of bimodal/functionalized mesoprorous silica nanoparticles on the adsorption of methylene blue from aqueous solution

Journal of Nanoanalysis

مقاله 3، دوره 5، شماره 1، خرداد 2018، صفحه 17-25   

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.22034/jna.2018.541846

نویسندگان

Shahnaz Nayyeri¹؛ Amir Vahid^{* 2}؛ Majid Abdous¹؛ Aliakbar Miran Beigi³

¹Faculty of chemistry, Amirkabir University of Technology, Tehran, Iran

²Downstream Devision, Research institute of petroleum industry, Tehran, Iran

³Research institute of petroleum industry, Tehran, Iran

چکیده

In this study, bimodal mesoporous silica, i.e. UVM-7, was synthesized and functionalized with
sulfonic acid and characterized using XRD, nitrogen physisorption, SEM, TEM and acid/base
titration. The results displayed that bimodal mesopore structure was firmly formed and acidic
functional groups were grafted on the surface of the UVM-7. The concentration of the acidic
functional groups was determined via titration by the standard NaOH solution. At the second
step, the adsorption of methylene blue from aqueous solutions onto UVM-7 and UVM-7/
SO3H was investigated. The effect of PH, temperature, dye concentration, salt concentration
and contact time on the adsorption of methylene blue was studied. The adsorption equilibrium
isotherms were well fitted to Langmuir rather than Freundlich model. Methylene blue
adsorption on UVM-7 increases with increasing the temperature and PH, which indicates
that the process is endothermic. Maximum adsorption capacity of methylene blue by UVM-7
and UVM-7/SO3H were 107.5 mg/g and 129.9 mg/g, respectively. The adsorption kinetics of
methylene blue for both UVM-7 and UVM-SO3H were pseudo-second order and well fitted to
Langmuir model.

کلیدواژه‌ها

Adsorption؛ Isotherm؛ Methylene Blue؛ Mesoporous silica؛ Wastewater treatment