Removal of diazinon pesticide from aqueous solutions using MCM-41 type materials: isotherms, kinetics and thermodynamics

2017 ◽  
Vol 15 (6) ◽  
pp. 1301-1312 ◽  
Author(s):  
M. A. Amani ◽  
A. M. Latifi ◽  
K. Tahvildari ◽  
R. Karimian
Keyword(s):  
Aqueous Solutions ◽  
Kinetics And Thermodynamics ◽  
Mcm 41

Adsorption of safranine T from aqueous medium by nano mesoporous MCM-41: adsorption equilibrium, kinetics, and thermodynamics

2020 ◽  
Vol 10 ◽  
Author(s):  
Xiao-Dong Li ◽  
Qing-Zhou Zhai
Keyword(s):  
Electron Microscopy ◽  
Ph Value ◽  
Particle Diameter ◽  
Spherical Particles ◽  
Practical Significance ◽  
Average Particle ◽  
Average Pore ◽  
Kinetics And Thermodynamics ◽  
Safranine T ◽  
Mcm 41

Introduction: In industrial production, a small amount of saffron T emissions will cause increase of water color and increase of chemical oxygen consumption, so study of the decolorization of saffron T wastewater has an important practical significance. Methods: MCM (Mobil Composition of Matter)-41 molecular sieve was synthesized by hydrothermal method. Power Xray diffraction and scanning electron microscopy were used to characterize the sample. Safranine T dye was adsorbed from water by the MCM-41 prepared. Kinetics and thermodynamics of the adsorption were studied. Results: The MCM-41 sample presented spherical particles and regular. The BET (Brunner-Emmett-Teller) specific surface area of the sample determined by 77 K low temperature nitrogen adsorption-desorption isotherm was 932 m2 /g. Its average particle diameter was 110 nm. TEM (transmission electron microscopy) results showed that the sample structure presented a honeycomb pore structure and the average pore diameter was 3.0 nm. The results showed that when room temperature was 20 ± 1 ℃, adsorbate safranine T: adsorbent MCM-41 = 20 : 1，the optimum pH value of adsorption was 4.0 and contact time was 20 min, the adsorption rate reached 98.29% and the adsorption capacity was 19.66 mg/g. The entropy change and enthalpy change of the adsorption system are respectively ΔS0 = 157.5 J/(mol·K); ΔH0 = 21.544 kJ/mol. When temperature was 277.15, 293.15, 303.15 K，the free energy change was respectively △G1 0 = -22.107 kJ/mol, △G2 0 = -24.627 kJ/mol, △G3 0 = -26.202 kJ/mol. Conclusion: The adsorption of safranine T by MCM-41 belongs to a pseudo-second-order adsorption. This adsorption accords with the Freundlich equation and belongs to a heterogeneous adsorption. The adsorption is an endothermic reaction of entropy increase, being spontaneous.

scholarly journals Enhanced Adsorption of Methylene Blue and Congo Red from Aqueous Solutions by MCM-41/HKUST-1 Composites

2019 ◽  
Vol 31 (8) ◽  
pp. 1675-1682 ◽  
Author(s):  
D.O. Sulistiono ◽  
E. Santoso ◽  
R. Ediati
Keyword(s):  
Methylene Blue ◽  
Mesoporous Silica ◽  
Aqueous Solutions ◽  
Congo Red ◽  
Metal Organic Framework ◽  
Solvent Mixture ◽  
Sem Images ◽  
Enhanced Adsorption ◽  
Xrd Patterns ◽  
Mcm 41

Impregnation of mesoporous silica MCM-41 on metal organic framework type HKUST-1 or often called CuBTC (BTC = 1,3,5-benzenetricarboxylate) has been successfully carried out by solvothermal methods in a solvent mixture of water, ethanol and N,N-dimethylformamide (DMF). The XRD patterns of the obtained solids showed that MCM-41/HKUST-1 composites had the same crystalline phase as pure as HKUST-1. SEM images revealed that the impregnation of the mesoporous silica to HKUST-1 did not alter the surface morphology of the original HKUST-1, which had octahedral shapes. In addition, the thermal stability of the MCM-41/HKUST-1 composites reached 302 °C, increased by 292 °C in comparison to the HKUST-1, even though the impregnation process resulted in a decreased in the specific surface area of the composites. Furthermore, MCM-41/HKUST-1 composites showed outstanding performance as adsorbent of methylene blue and Congo red in aqueous solutions. Results of adsorption studies showed that a pseudo-second order kinetics and Langmuir isotherm were observed for both types of dyes.

Adsorptive removal of copper (II) from aqueous solutions on phosphates: equilibrium, kinetics, and thermodynamics

2015 ◽  
pp. 1-10 ◽  
Author(s):  
L. El Fakir ◽  
M. Flayou ◽  
A. Dahchour ◽  
S. Sebbahi ◽  
F. Kifani-Sahban ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Kinetics And Thermodynamics ◽  
Adsorptive Removal

Hydrogen Production from Aqueous Solutions of Glycerol on TiO2/Ru-MCM-41 Photocatalysts Using Solar Light

2017 ◽  
Vol 60 (15-16) ◽  
pp. 1196-1209 ◽  
Author(s):  
Fabielle C. Marques ◽  
Maria Cristina Canela ◽  
Alexandre M. Stumbo
Keyword(s):  
Hydrogen Production ◽  
Aqueous Solutions ◽  
Solar Light ◽  
Mcm 41

Equilibrium, kinetics, and thermodynamics studies of Cr(VI) adsorption from aqueous solutions on organoclay using ionic liquid-type imidazolium surfactants

2017 ◽  
Vol 100 ◽  
pp. 135-144 ◽  
Author(s):  
Yaqin Liang ◽  
Yan Li ◽  
Shuping Zhang ◽  
Hui Li ◽  
Xiaoming Mao ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Aqueous Solutions ◽  
Kinetics And Thermodynamics ◽  
Liquid Type

Comparative Study of Silylation Methods to Improve the Stability of Silicate MCM-41 in Aqueous Solutions

2003 ◽  
Vol 15 (3) ◽  
pp. 619-624 ◽  
Author(s):  
Jenny M. Kisler ◽  
Michelle L. Gee ◽  
Geoffrey W. Stevens ◽  
Andrea J. O'Connor
Keyword(s):  
Comparative Study ◽  
Aqueous Solutions ◽  
The Stability ◽  
Mcm 41
Sign in / Sign up

Export Citation Format

Share Document