Grafting and stabilization of ordered mesoporous silica COK-12 with graphene oxide for enhanced removal of methylene blue

Henning, Laura M.; Simon, Ulla; Gurlo, Aleksander; Smales, Glen J.; Bekheet, Maged F.

Grafting and stabilization of ordered mesoporous silica COK-12 with graphene oxide for enhanced removal of methylene blue

dc.contributor.author	Henning, Laura M.
dc.contributor.author	Simon, Ulla
dc.contributor.author	Gurlo, Aleksander
dc.contributor.author	Smales, Glen J.
dc.contributor.author	Bekheet, Maged F.
dc.date.accessioned	2019-11-26T12:17:36Z
dc.date.available	2019-11-26T12:17:36Z
dc.date.issued	2019-11-07
dc.description.abstract	Large-pore ordered mesoporous silica (OMS) COK-12, analogous to the well-known SBA-15, but synthesized in a more environmentally friendly way and exhibiting a shorter plate-like structure, was grafted with different amounts of graphene oxide (GO) for the first time in an inexpensive and rapid process, that was successfully upscaled. Samples were examined with nitrogen sorption analysis, SAXS, Raman spectroscopy, XPS, and zeta potential analysis. Adsorption experiments with the cationic dye methylene blue (MB) were conducted on the grafted materials and on pure COK-12, taking into account the influence of initial dye concentration (30–600 mg L−1), adsorbent dosage (0.2–14 g L−1), contact time (0.3–300 min), solution pH (4–10), and influence of salts and temperature (0–1 M NaCl, 80 °C) to simulate industrial dye effluent. The adsorption process was found to be represented best by the Langmuir isotherm model, i.e., adsorption is a monolayer process. The calculated maximum adsorption capacities were found to be 20.2 and 197.5 mg g−1 at dosages of 5 and 0.5 g L−1 for pure COK-12 and COK-12 grafted with 50 wt% GO, respectively, at pH 5.65 and MB concentration of 100 mg L−1. Adsorption kinetics were found to follow the pseudo-second order model, i.e., chemisorption is the rate controlling step. The adsorption performances could be well preserved at simulated dye effluent. Desorption was found to be most effective with hydrochloric acid. The COK-12 grafted with GO presented in this work shows superior adsorption properties in comparison to other grafted OMS materials. In addition, grafting with GO remarkably improved the stability of COK-12 in aqueous solution.	en
dc.description.sponsorship	TU Berlin, Open-Access-Mittel - 2019	en
dc.identifier.eissn	2046-2069
dc.identifier.uri	https://depositonce.tu-berlin.de/handle/11303/10375
dc.identifier.uri	http://dx.doi.org/10.14279/depositonce-9335
dc.language.iso	en	en
dc.relation.ispartof	10.14279/depositonce-17848
dc.rights.uri	https://creativecommons.org/licenses/by/3.0/	en
dc.subject.ddc	540 Chemie und zugeordnete Wissenschaften	de
dc.subject.other	mesoporous silica	en
dc.subject.other	graphene oxide	en
dc.subject.other	dyes	en
dc.subject.other	methylene blue	en
dc.subject.other	adsorption	en
dc.title	Grafting and stabilization of ordered mesoporous silica COK-12 with graphene oxide for enhanced removal of methylene blue	en
dc.type	Article	en
dc.type.version	publishedVersion	en
dcterms.bibliographicCitation.doi	10.1039/C9RA05541J	en
dcterms.bibliographicCitation.issue	62	en
dcterms.bibliographicCitation.journaltitle	RSC Advances	en
dcterms.bibliographicCitation.originalpublishername	Royal Society of Chemistry	en
dcterms.bibliographicCitation.originalpublisherplace	Cambridge	en
dcterms.bibliographicCitation.pageend	36284	en
dcterms.bibliographicCitation.pagestart	36271	en
dcterms.bibliographicCitation.volume	9	en
tub.accessrights.dnb	free	en
tub.affiliation	Fak. 3 Prozesswissenschaften::Inst. Werkstoffwissenschaften und -technologien::FG Keramische Werkstoffe	de
tub.affiliation.faculty	Fak. 3 Prozesswissenschaften	de
tub.affiliation.group	FG Keramische Werkstoffe	de
tub.affiliation.institute	Inst. Werkstoffwissenschaften und -technologien	de
tub.publisher.universityorinstitution	Technische Universität Berlin	en