Mitigation of toxic alexandrium tamiyavanichii using chitosan-silica composite = Mitigasi alexandrium tamiyavanichii bertoksik menggunakan komposit kitosan-silika
The harmful algal bloom (HABs) phenomena affects human health, ecosystems, fishing, and tourism industries. In a single occasion, the loss due to HABs can reach thousands of Ringgit Malaysia. In this study, a chitosan-silica composite (RHA-CHi) was synthesized via sol-gel technique for the mitigat...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English English |
| Published: |
Malaysian Analytical Society
2019
|
| Subjects: | |
| Online Access: | http://irep.iium.edu.my/72392/ http://irep.iium.edu.my/72392/ http://irep.iium.edu.my/72392/ http://irep.iium.edu.my/72392/1/72392%20Mitigation%20of%20toxic.pdf http://irep.iium.edu.my/72392/2/72392%20Mitigation%20of%20toxic%20SCOPUS.pdf |
| Summary: | The harmful algal bloom (HABs) phenomena affects human health, ecosystems, fishing, and tourism industries. In a single
occasion, the loss due to HABs can reach thousands of Ringgit Malaysia. In this study, a chitosan-silica composite (RHA-CHi)
was synthesized via sol-gel technique for the mitigation of Alexandrium tamiyavanichii, a toxic HAB species isolated from
Malaysian waters. Rice husk ash silica was used as the silica precursor in the composite synthesis. The FT-IR spectroscopy
suggests that the chitosan was covalently bonded with the surface silanol groups. Light microscope analysis showed that the
algal cells were stuck on the surface of the composite and underwent lysis. The incorporation of chitosan decreased the surface
negative charge of the silica, hence, increasing the electrostatic attraction between the cells and RHA-Chi. The removal
efficiency of A. tamiyavanichii was 75% using 0.1 mg/mL of RHA-Chi in 2 hours, increasing to 85% after 24 hours. Reduced
removal efficiency (16%) was observed using silica alone. The findings show that the chitosan-silica composite has high
potential to be used in the mitigation of A. tamiyavanichii.
********************************************************************************************************
Fenomena ledakan alga-bahaya mengancam kesihatan manusia, industri perikanan dan pelancongan. Dalam satu kejadian,
kerugian boleh mencecah ribuan Ringgit Malaysia. Dalam kajian ini, komposit kitosan-silika (RHA-CHi) telah disintesis melalui
kaedah sol-gel untuk mitigasi Alexandrium tamiyavanichii, spesis bertoksik HAB yang dipencilkan dari perairan Malaysia. Abu
sekam padi telah digunakan sebagai pelopor silika dalam sintesis komposit. Spektroskopi FT-IR menunjukkan kitosan terikat
secara kovalen dengan kumpulan silanol permukaan. Analisis mikroskopi cahaya menunjukkan sel alga melekat pada permukaan
komposit dan mengalami lisis. Penggabungan kitosan telah mengurangkan cas negatif permukaan silika lalu meningkatkan
tarikan elektrostatik antara sel dan RHA-Chi. Kecekapan penyingkiran A. tamiyavanichii dalam masa 2 jam apabila 0.1 mg/ml
RHA-Chi digunakan adalah 75% dan meningkat ke 85% selepas 24 jam manakala pengurangan kecekapan penyingkiran (16%)
diperhatikan bagi silika sahaja. Penemuan ini menunjukan komposit kitosan-silika mempunyai potensi yang tinggi untuk
digunakan dalam mitigasi ledakan alga-bahaya terutamanya A. tamiyavanichii. |
|---|