Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 61-67 |
| Number of pages | 7 |
| Journal | Separation and Purification Technology |
| Volume | 162 |
| DOIs | |
| Publication status | Published - Apr 13 2016 |
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Keywords
- Anti algal
- Nanorods
- Photocatalysis
- Pre-treatment
- Zinc oxide
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation
Cite this
Removal and regrowth inhibition of microalgae using visible light photocatalysis with ZnO nanorods : A green technology. / Sathe, Priyanka; Myint, Myo Tay Zar; Dobretsov, Sergey; Dutta, Joydeep.
In: Separation and Purification Technology, Vol. 162, 13.04.2016, p. 61-67.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Removal and regrowth inhibition of microalgae using visible light photocatalysis with ZnO nanorods
T2 - A green technology
AU - Sathe, Priyanka
AU - Myint, Myo Tay Zar
AU - Dobretsov, Sergey
AU - Dutta, Joydeep
PY - 2016/4/13
Y1 - 2016/4/13
N2 - 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.
AB - 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.
KW - Anti algal
KW - Nanorods
KW - Photocatalysis
KW - Pre-treatment
KW - Zinc oxide
UR - http://www.scopus.com/inward/record.url?scp=84957824914&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84957824914&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2016.02.007
DO - 10.1016/j.seppur.2016.02.007
M3 - Article
AN - SCOPUS:84957824914
VL - 162
SP - 61
EP - 67
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
ER -