TY - JOUR
T1 - Adsorptive removal of nitro- or sulfonate-containing dyes by a functional metal–organic framework
T2 - Quantitative contribution of hydrogen bonding
AU - Woo, Ho Chul
AU - Jhung, Sung Hwa
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - The removal of organic dyes from water is important from the perspective of sustainability. In this study, the adsorptive removal of four dyes having nitro or sulfonate groups was performed using highly porous metal–organic frameworks (MOFs, MIL101s) with or without further functionalization. In particular, a melamine-functionalized MOF (MIL101-Mela) was effective in the removal of martius yellow (MY), naphthol yellow S, orange G, and sunset yellow FCF. For example, the adsorbed quantity of MY over MIL101-Mela, even after the fourth recycle, was 6.9 times that over the fresh activated carbon. Moreover, MIL101-Mela showed higher adsorption capacity for the four studied dyes than previously reported any adsorbent. The adsorption results suggest the importance of the number of hydrogen donors and hydrogen acceptors in adsorbents and dyes, respectively, for improved performance in dye removal. Importantly, the mechanism of the dyes adsorption over the functionalized MIL101s is explained by the formation of six-membered rings between the studied MOFs and the dyes via hydrogen bonding. This work will pave the way toward the development of effective adsorbents for organics having high concentration of nitro or sulfonate groups.
AB - The removal of organic dyes from water is important from the perspective of sustainability. In this study, the adsorptive removal of four dyes having nitro or sulfonate groups was performed using highly porous metal–organic frameworks (MOFs, MIL101s) with or without further functionalization. In particular, a melamine-functionalized MOF (MIL101-Mela) was effective in the removal of martius yellow (MY), naphthol yellow S, orange G, and sunset yellow FCF. For example, the adsorbed quantity of MY over MIL101-Mela, even after the fourth recycle, was 6.9 times that over the fresh activated carbon. Moreover, MIL101-Mela showed higher adsorption capacity for the four studied dyes than previously reported any adsorbent. The adsorption results suggest the importance of the number of hydrogen donors and hydrogen acceptors in adsorbents and dyes, respectively, for improved performance in dye removal. Importantly, the mechanism of the dyes adsorption over the functionalized MIL101s is explained by the formation of six-membered rings between the studied MOFs and the dyes via hydrogen bonding. This work will pave the way toward the development of effective adsorbents for organics having high concentration of nitro or sulfonate groups.
KW - Adsorption
KW - Dyes
KW - Hydrogen bond
KW - Metal–organic frameworks
KW - Six-membered ring
UR - http://www.scopus.com/inward/record.url?scp=85107664544&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.130598
DO - 10.1016/j.cej.2021.130598
M3 - Article
AN - SCOPUS:85107664544
SN - 1385-8947
VL - 425
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 130598
ER -