Change search
ReferencesLink to record
Permanent link

Direct link
Removal and regrowth inhibition of microalgae using visible light photocatalysis with ZnO nanorods: a green technology
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.ORCID iD: 0000-0002-0074-3504
2016 (English)In: Separation and Purification Technology, Vol. 162, 61-67 p.Article in journal (Refereed) PublishedText
Abstract [en]

Algal biofouling can be a major problem during membrane filtration processes reducing membrane efficiency. Removal of microalgae by visible light photocatalysis using zinc oxide (ZnO) nanorods was studied in this work. ZnO nanorods were grown on polypropylene support substrates. The treatment unit was constructed by incorporating ZnO nanocoated substrates in a glass tube. Anti-algal activity of the treatment units were tested using green microalga, Dunaliella salina, of 107 cells/mL concentration, which is higher than the concentration of cells during algal blooms. Nearly total algal cell inactivation was achieved within 2 h of continuous visible light illumination in the presence of nanocoated support substrates, as determined by flow cytometry analysis (98%) and trypan blue staining (95%). Uncoated support substrate under light illumination did not lead to algal cell mortality (1.7%). Complete inhibition of any regrowth of algal cells treated with nanocoated substrates was confirmed as no significant changes in the total number of cells were observed even after 2 weeks of incubation of the treated culture. The anti-algal activity of ZnO nanorods was attributed to the formation of reactive oxygen species (ROS) through photocatalytic processes. ZnO nanorod coated substrates used in the treatment units could be a suitable green method to control membrane fouling in water treatment plants avoiding the utilisation of harmful chemicals.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 162, 61-67 p.
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-185134DOI: 10.1016/j.seppur.2016.02.007ISI: 000372937400009ScopusID: 2-s2.0-84957824914OAI: diva2:918341

QC 20160418

Available from: 2016-04-11 Created: 2016-04-11 Last updated: 2016-04-25Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Dutta, Joydeep
By organisation
Functional Materials, FNM
Nano Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 8 hits
ReferencesLink to record
Permanent link

Direct link