Synthesis of Zero-valent iron nanoparticles by microfluidic reactor for organic dye treatment
Nguyen, Kieu Anh (2020)
Nguyen, Kieu Anh
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020060116012
https://urn.fi/URN:NBN:fi:amk-2020060116012
Tiivistelmä
The textile and garment industry has been a crucial sector to Vietnamese economy for the last five years. Since the industry relies on water resources for its production and its wastewater contains organic dyes which are hazardous to environment, it is essential that advanced technology be applied to replace old-fashioned treatment methods. Particularly, application of iron nanomaterial in textile wastewater treatment was proposed in this project.
In this study, iron nanomaterial was synthesized by a reaction of FeCl3 with NaBH4 using microfluidic device as a microreactor which was fabricated from polydimethylsiloxane by photolithography and soft lithography processes. The design had double spiral micromixers to ensure highest mixing rate. The morphology and structure of the as-prepared nanomaterial were characterized by scanning microscope and X-ray diffraction analyses. The collected product was zero valent iron material in the shape of nano-sheet with average thickness of approximately 50 nm. Organic dye molecules from methyl orange and methylene blue solutions could be removed by the as-prepared iron nanomaterial. The removal of dye ions was determined and assessed by the visible ultraviolet absorption spectroscopy. The absorbance was directly proportional to the amount of nanomaterial used and was impacted by pH conditions.
The removal of dye ions with iron nanomaterial synthesized by microfluidic reactor resulted in great efficiency, mostly above 80%. In addition, this new approach could minimize drawbacks of conventional methods and offer outstanding advances: even-sized nanoparticles, compact design, low operation cost, automated process, etc.
The project in the early stage still experienced difficulties and limitations, yet the overall data showed promising potential of microfluidic device in textile wastewater treatment. In the next stages, the project planned to complete final model of the device and test it with wastewater from textile factories and weaving village in Vietnam. Green chemicals were examined to replace NaBH4 as well to reduce possible toxic by-products.
In this study, iron nanomaterial was synthesized by a reaction of FeCl3 with NaBH4 using microfluidic device as a microreactor which was fabricated from polydimethylsiloxane by photolithography and soft lithography processes. The design had double spiral micromixers to ensure highest mixing rate. The morphology and structure of the as-prepared nanomaterial were characterized by scanning microscope and X-ray diffraction analyses. The collected product was zero valent iron material in the shape of nano-sheet with average thickness of approximately 50 nm. Organic dye molecules from methyl orange and methylene blue solutions could be removed by the as-prepared iron nanomaterial. The removal of dye ions was determined and assessed by the visible ultraviolet absorption spectroscopy. The absorbance was directly proportional to the amount of nanomaterial used and was impacted by pH conditions.
The removal of dye ions with iron nanomaterial synthesized by microfluidic reactor resulted in great efficiency, mostly above 80%. In addition, this new approach could minimize drawbacks of conventional methods and offer outstanding advances: even-sized nanoparticles, compact design, low operation cost, automated process, etc.
The project in the early stage still experienced difficulties and limitations, yet the overall data showed promising potential of microfluidic device in textile wastewater treatment. In the next stages, the project planned to complete final model of the device and test it with wastewater from textile factories and weaving village in Vietnam. Green chemicals were examined to replace NaBH4 as well to reduce possible toxic by-products.