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    Microbial-induced CaCO3 filled seaweed-based film for green plasticulture application

    Year: 2018

    Journal: J. Clean Prod., Volume 199, OCT 20, page 150–163

    Authors: Khalil, H. P. S. Abdul; Chong, E. W. N.; Owolabi, F. A. T.; Asniza, M.; Tye, V. Y.; Tajarudin, H. A.; Paridah, M. T.; Rizal, S.

    Organizations: Ministry of Higher Education [FRGS-203/PTEKIND/6711531]

    Keywords: Bacillus sphaericus; Biodegradable polymers; Biopolymers; Calcium carbonate; Red seaweed

    This work aimed to develop green biodegradable film using red seaweed (Kappaphycus alvarezii) as a base matrix and calcium carbonate (CaCO3) as a filler to enhance the properties of the red seaweed material for plasticulture purpose. CaCO3 which was produced by microbially induced precipitation (MB-CaCO3) using Bacillus sphaericus, was characterized and compared with the commercial CaCO3 (C CaCO3). FESEM image revealed that the size of MB-CaCO3 was smaller and more uniform compared to C-CaCO3. FTIR and XRD analyses confirmed the existence of crystalline polymorph of calcite in MB-CaCO3, which contained a higher percentage of calcite than C-CaCO3. However, the crystallinity and thermal stability of MB-CaCO3 was lower than C-CaCO3. From the results of physical, mechanical and thermal properties of composite films filled with C-CaCO3 and MB-CaCO3 fillers, the optimum loading of C-CaCO3 and MB-CaCO3 was found at 0.1% and 0.15%, respectively. Composite films filled with MB-CaCO3 promote brighter film, better water barrier, hydrophobicity and biodegradability compared to C-CaCO3. Since the effect of MB-CaCO3 on film functional properties was comparable to C-CaCO3, it can be used as an alternative to C-CaCO3 as inorganic filler for composite films in agriculture applications. (C) 2018 Elsevier Ltd. All rights reserved.
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