نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
2 عضو هیات علمی، گروه علوم و مهندسی کاغذ، دانشکده مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان - ایران
3 گروه علوم و مهندسی کاغذ، دانشکده مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
4 دانشیار گروه علوم و مهندسی کاغذ، دانشکده مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Cellulose extracted from algal sources has attracted considerable attention as a high–value biopolymer due to its unique physicochemical characteristics and wide range of potential applications. Despite recent advances in cellulose extraction techniques from algal biomass, further investigation and optimization of physico mechanical methods are still required to obtain cellulose with desirable properties and enhanced processability. In this study, cellulose was extracted and characterized from the green macroalga Cladophora sp. through a multistep chemo–mechanical process consisting of methanol pretreatment, alkaline treatment (NaOH), and two–stage bleaching using H₂O₂/NaOH and NaClO. The final product was characterized by Fourier Transform Infrared Spectroscopy (FTIR), chemical composition analysis, yield determination, α–cellulose content, intrinsic viscosity, and degree of polymerization (DP). The purification process markedly reduced the protein and ash contents to 0.7% and 0.51%, respectively, while increasing the α–cellulose purity to 91.6%. Although the DP decreased significantly from 2500 to 1290 (approximately 48.5%) during the NaClO bleaching stage, this reduction may facilitate subsequent mechanical treatments for ideal nanocellulose production. The overall yield of cellulose was 69.9%, highlighting the high potential of Cladophora sp. as a sustainable source for producing high–purity cellulose. FTIR results further confirmed the effective removal of non–cellulosic constituents (lipids, hemicelluloses, lignin and pigments) and the corresponding enhancement in cellulose purity. Overall the findings demonstrate the efficiency of the proposed extraction approach for obtaining high–purity cellulose fibers with desirable physicochemical properties compare with previous methods.
کلیدواژهها [English]
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