Development of a superhydrophilic surface using TiO2 nanoparticles for anti-biofouling application in a freshwater environment | |
| Author | Nitsuphang Kongsa |
| Call Number | AIT Thesis no.EV-18-19 |
| Subject(s) | Freshwater biology Fouling Prevention Surfaces (Technology) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-18-19 |
| Abstract | This thesis aims to develop coating on material surface which is an anti - biofouling and environmental friendly. Biofouling is form of microorganisms such as bacteria and diatom and macroorganisms such as macroalgae and snail. Since attachment of freshwater biofouling on material surfaces increases, the surfaces increas e corrosion and loss of properties. To deal with this problem, development of superhydrophilic surface has been studied by using TiO 2 NPs coating. Development of TiO 2 NPs thin film was done on glass panels by using Sparking machine which was provided by Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, Thail and. Various TiO 2 NPs coated layers on glass panels were also studied. Characterization s of TiO 2 NPs coated layers were tested by water contact angle, transmission and absorbance, shown that 15 TiO 2 NPs coated layers was the best condition. It was observed that the developed TiO 2 NPs film was successfully applied by a sparking technique as thinly adsorbed layers on glass panel surfaces . Scanning electron microscope (SEM) imagery shown that the S ize of TiO 2 NPs was found to be 20 - 50 nm, while thickness of th e TiO 2 NPs film was very thin layer. Test of TiO 2 NPs coating on glass panel was studied in AIT fountain pond within 30 days . SEM also shown that TiO 2 NPs still stuck on gl ass surface after 30 days underwater . Environmental analysis after underwater submersion , found that different percentage of total solid, total volati le solid and total organic carbon after 30 days underwater between control and TiO 2 NPs co ated glass was higher than 50%, 6 0% and 60%, respectively. As far as Eukaria were concerned 70% of biofouling was ascribed to microalgae, while 30% was due to protozoans. However, on coated glass panels dead protozoans were found, presumably due to photocatalytic activity. Moreover, Toxicity of TiO 2 NPs to zebrafi sh was also studied. Zebrafishes were exposure to TiO 2 NPs solution in 10 mg/l, 25 mg/l, 50 mg/l and 75 mg/l and test with 10 TiO 2 NPs coated glass panels in water for 96 h. The result shown that TiO 2 NPs size was 35.96 nm after sonication in solution and 20 - 50.0 nm on 10 glass panels. LC50 of TiO 2 NPs to zebrafish was determined to be 75 mg/l after 96 h. Zebrafish were dead due to eating nanoparticles and grills absorption . Since the size of nanoparticles was very small, it was found that toxicity was getting higher with larger size. Once nanoparticles got into zebrafish body, TiO 2 NPs caused death of zebrafish. Production s of photocatalytic activity is reactive oxygen spec ies (ROS) and h ydroxy radical. |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-18-19 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Shipin, Oleg V.; |
| Examination Committee(s) | Ekbordin Winijkul;Hornyak, Gabriel Louis;Bora, Tanujjal; |
| Scholarship Donor(s) | RTG Fellowship; |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2018 |