Comparison of ordered mesoporous materials sorption properties towards amino acids

Abstract

The adsorption of amino acids such as L-phenylalanine and L-histidine was carried out on a series of mesoporous carbons obtained with the use ordered silicas KIT-6, SBA-16, SBA-15 as templates and furfuryl alcohol as carbon precursor. Small angle XRD analysis confirmed the ordered mesoporous structures of all materials obtained. They were also characterised by well-developed surface areas and high pore volumes. Adsorption behaviour of amino acids on ordered mesoporous carbons was investigated in potassium phosphate buffer solutions with adjustable L-phenylalanine and L-histidine concentration, ion strength, and pH. The highest sorption capacity towards the amino acids were observed at pH close to the isoelectric point of L-phenylalanine (pI = 5.48) and L-histidine (pI = 7.59). Electrostatic, hydrophobic and steric interactions had very strong effect on the adsorption of amino acids on mesoporous carbons. The amount of L-phenylalanine and L-histidine adsorbed decreased in the following sequence: C [ C SBA-16 [ C SBA-15 that was strongly related to their structure, surface areas and average pore diameters.

Adsorption capability of activated carbon synthesized from coconut shell

“…Additionally, these adsorbents need a long contact time with the adsorbate [18][19][20][21][22]. Therefore, with a high specific surface area, large pore volume, suitable pore size (2-50 nm), high degree of surface reactivity and effective adsorption quality, activated carbon has become the most desirable adsorbent [23][24][25][26].…”

Equilibrium and kinetic studies of chromotrope 2R adsorption onto ordered mesoporous carbons modified with lanthanum

“…Recently much attention has been paid to the ordered mesoporous carbons (pore size range from 2 to 50 nm) possessing unique physical and chemical properties, such as high surface area, large pore volume, specific chemical properties and good mechanical stability [21][22][23].…”

Sorptive properties of aluminium ions containing mesoporous silica towards l-histidine

“…Another scientific group has investigated the sorption behaviour of five selected amino acids such as glutamic acid, arginine, phenylalanine, leucine, and alanine on mesoporous materials (SBA-15, Al-SBA-15, CH 3 (10 %)-SBA-15, and CH 3 (20 %)-SBA-15) . We have found that L-histidine has been so far adsorbed on mesoporous carbon CMK-3 (Vinu et al 2006) and C SBA-16 and C SBA-15 (Goscianska et al 2013c). Up to date, there have been a few publications concerning the potential application of modified ordered mesoporous silica for L-histidine adsorption.…”