ARTICLE
TITLE

Comparison of the efficiency of mesoporous silicas as absorbents for removing naphthalene from contaminated water

SUMMARY

Mesoporous silicas MCM-48 and SBA-15 were synthesized and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. Adsorption capacity of two mesoporous silica for removing naphthalene from waste water was determined. The results indicate that under similar conditions, SBA-15 had a better adsorption capacity than MCM-48. In this context, SBA-15 was modified using 3-aminopropyltrimethoxysilane and the effect of contact time, adsorbent dose, solution pH and concentration of naphthalene was investigated in batch adsorption systems. Solution pH appeared to be a key factor affecting the adsorption of naphthalene by NH2-SBA-15. The adsorption experiments revealed that a higher percentage of up to 79.3% of naphthalene was adsorbed in highly acidic media (pH of 2). The equilibrium data were analyzed using Langmuir and Freundlich isotherms and nonlinear regression analysis. This revealed that based on the correlation coefficient (R2 = 0.979) the Langmuir model provided the best fit to the results. The adsorption kinetic was determined using the pseudo-first order, pseudo-second order and Elovich kinetic models. Of the kinetics models tested, the pseudo-first-order equation provided the best fit to the results (R2 = 0.991) of the absorption of naphthalene by the adsorbent.

 Articles related

Argadjendra Sentot,Moch Isnaeni,Slamet Suhartono,Endang Prasetyawati    

The concept of non-performing loan settlement as stipulated in the banking legal system in Indonesia, especially settlement through litigation in court, is not in accordance with the demands of efficiency in the business world and the dynamics of nationa... see more


V. Andrusiak,V. Kravchenko    

The paper explored the features of information acquisition by people with different individual learning styles in accordance with the VARK classification (Visual, Auditory, Reading, Kinesthetic), which is popular in the educational field, using a compara... see more


H? Tú Linh,Wang Yi Xia,Nguy?n Ðình Chi?n DOI: 10.26459/hujos-ssh.v70i1.3431    

This paper compared the efficiency of IPO pricing mechanisms namely Fixed Price (FP) and Book-Building (BB) in China by analyzing IPOs' underpricing level. Findings include (1) the FP regime was more efficient than the BB one because the BB did not reduc... see more


Sakineh Saghaeiannejad_Isfahani,Reza Hoveida,Saeed RajaeePour,Saeideh Ketabi    

Providing a valuable tool for the realization of the nation’s aspirations, the teaching system of the nations is deemed as one of their critical assets in dealing with their future potential challenges. Accordingly, assessing the teaching systems would b... see more


Judit Kimpian,Paola Marrone,Lucia Martincigh,Dejan Mumovic    

Environmental quality and energy efficiency are strategic objectives which can highlight the ‘effectiveness’ of design and technological choices, as well as the impact of management strategies and user behaviour. Studies show it is possible to narrow the... see more