Nine red macroalgae(Amphiroa rigida,Gracilaria bursa-pastoris,Gracilaria gracilis,Grateloupia torture,Jania rubens,Laurencia obtusa,Laurencia pyramidalis,Liagora viscida,and Pterocladiella capillaries)were collected f...Nine red macroalgae(Amphiroa rigida,Gracilaria bursa-pastoris,Gracilaria gracilis,Grateloupia torture,Jania rubens,Laurencia obtusa,Laurencia pyramidalis,Liagora viscida,and Pterocladiella capillaries)were collected from coastal waters of Türkiye,and their proximate,fatty acid,soluble carbohydrate,and mineral profiles were investigated in the present study.According to the results,the crude protein content of the samples was between 4%and 23.8%,and four of the samples(G.turuturu,L.obtusa,L.pyramidalis,and P.capillacea)contained more than 10%protein.The crude lipid content of all the samples was below 1.6%,and the total carbohydrate content was between 38.3%and 76.9%.The macroalgae samples were generally richer in saturated fatty acids,palmitic acid being the most abundant,whereas G.gracilis had the highest content of unsaturated fatty acids(55.8%).All samples exhibited high contents of myo-inositol or glucose.Also,the samples generally had a good composition of minerals.Still,the heavy metal(i.e.,Pb and Cd)content of Gracilaria gracilis was higher(59.6μg/kg,P<0.05)than those of the other algae samples.This study provides valuable insight into the chemical composition and fatty acid,mineral,and soluble carbohydrate profiles of Amphiroa rigida,Gracilaria bursa-pastoris,Gracilaria gracilis,Grateloupia turuturu,Jania rubens,Laurencia obtusa,Laurencia pyrami-dalis,Liagora viscida,and Pterocladiella capillacea from Türkiye.展开更多
One-pot chemical activation and pyrolysis process was developed for biochar production from red macroalgae residue of Gelidium sesquipedale.The macroalgae residue was activated by various catalysts(KOH,NaOH,H_(3)PO_(4...One-pot chemical activation and pyrolysis process was developed for biochar production from red macroalgae residue of Gelidium sesquipedale.The macroalgae residue was activated by various catalysts(KOH,NaOH,H_(3)PO_(4),and CH_(4)ON_(2))with the two concentrations(2.5 wt%and 5 wt%)using a pulverization system followed by slow pyrolysis at 500℃.The activated biochars showed a porous morphology with an increase of water holding capacity compared to the unactivated one.The properties of activated biochar observed by further characterization(i.e.,FTIR,SEM,TGA)revealed their feasibility to be used as an adsorbent.The results of adsorption experiment confirmed that adsorption was dependent not only on the surface area but also on the surface charge,and functional groups.The sorption performance of activated biochars(AcBC),in terms of the adsorption of methylene blue,was comparable to commercial activated charcoal(Norit^(■)).NaOH(2.5 wt%)-activated biochar had the removal efficiency of 87%versus 97%for commercial activated charcoal.展开更多
基金supported by The Scientific and Technological Research Council of Turkey(TUBITAK,Project no:119O149).
文摘Nine red macroalgae(Amphiroa rigida,Gracilaria bursa-pastoris,Gracilaria gracilis,Grateloupia torture,Jania rubens,Laurencia obtusa,Laurencia pyramidalis,Liagora viscida,and Pterocladiella capillaries)were collected from coastal waters of Türkiye,and their proximate,fatty acid,soluble carbohydrate,and mineral profiles were investigated in the present study.According to the results,the crude protein content of the samples was between 4%and 23.8%,and four of the samples(G.turuturu,L.obtusa,L.pyramidalis,and P.capillacea)contained more than 10%protein.The crude lipid content of all the samples was below 1.6%,and the total carbohydrate content was between 38.3%and 76.9%.The macroalgae samples were generally richer in saturated fatty acids,palmitic acid being the most abundant,whereas G.gracilis had the highest content of unsaturated fatty acids(55.8%).All samples exhibited high contents of myo-inositol or glucose.Also,the samples generally had a good composition of minerals.Still,the heavy metal(i.e.,Pb and Cd)content of Gracilaria gracilis was higher(59.6μg/kg,P<0.05)than those of the other algae samples.This study provides valuable insight into the chemical composition and fatty acid,mineral,and soluble carbohydrate profiles of Amphiroa rigida,Gracilaria bursa-pastoris,Gracilaria gracilis,Grateloupia turuturu,Jania rubens,Laurencia obtusa,Laurencia pyrami-dalis,Liagora viscida,and Pterocladiella capillacea from Türkiye.
文摘One-pot chemical activation and pyrolysis process was developed for biochar production from red macroalgae residue of Gelidium sesquipedale.The macroalgae residue was activated by various catalysts(KOH,NaOH,H_(3)PO_(4),and CH_(4)ON_(2))with the two concentrations(2.5 wt%and 5 wt%)using a pulverization system followed by slow pyrolysis at 500℃.The activated biochars showed a porous morphology with an increase of water holding capacity compared to the unactivated one.The properties of activated biochar observed by further characterization(i.e.,FTIR,SEM,TGA)revealed their feasibility to be used as an adsorbent.The results of adsorption experiment confirmed that adsorption was dependent not only on the surface area but also on the surface charge,and functional groups.The sorption performance of activated biochars(AcBC),in terms of the adsorption of methylene blue,was comparable to commercial activated charcoal(Norit^(■)).NaOH(2.5 wt%)-activated biochar had the removal efficiency of 87%versus 97%for commercial activated charcoal.
