Biofuels Bioproducts & Biorefining-Biofpr最新文献_第4页

Potassium hydroxide activation of microalgal biochar for improved adsorption efficiency 氢氧化钾活化微藻生物炭提高吸附效率

IF 3.8 4区生物学

Biofuels Bioproducts & Biorefining-Biofpr Pub Date : 2026-07-04 Epub Date: 2026-04-06 DOI: 10.1002/bbb.70169

Keito Kubota, Numan Luthfi, Takashi Fukushima, Kenji Takisawa

{"title":"Potassium hydroxide activation of microalgal biochar for improved adsorption efficiency","authors":"Keito Kubota, Numan Luthfi, Takashi Fukushima, Kenji Takisawa","doi":"10.1002/bbb.70169","DOIUrl":"https://doi.org/10.1002/bbb.70169","url":null,"abstract":"Activated carbon was prepared from Chlorella by carbonization and potassium hydroxide activation, and its structural properties and methylene blue (MB) adsorption performance were evaluated. Raw Chlorella exhibited an adsorption capacity of 287.2 mg g−1, which decreased to 214.8 mg g−1 after carbonization. Potassium hydroxide (KOH) activation increased the adsorption capacity to 329.7 mg g−1, representing an increase of approximately 15% compared with the raw material and 54% relative to the biochar. This improvement was attributed to the development of a porous structure and the increase in specific surface area induced by the activation process. Adsorption isotherms were analyzed using the Langmuir, Freundlich, and Temkin models. The Langmuir model gave a maximum monolayer adsorption capacity of 379.6 mg g−1, whereas the Freundlich model provided the best fit (R2 = 0.93), indicating predominance of multilayer physisorption. Temkin analysis showed strong adsorption during the initial stages, followed by a gradual decrease in adsorption heat, reflecting surface heterogeneity and a partial contribution of chemisorption. These findings demonstrate that KOH activation effectively enhances the adsorption performance of Chlorella-derived carbon materials and that the adsorption mechanism involves coexistence of monolayer adsorption, multilayer adsorption, and chemisorption.","PeriodicalId":55380,"journal":{"name":"Biofuels Bioproducts & Biorefining-Biofpr","volume":"20 4","pages":"1911-1922"},"PeriodicalIF":3.8,"publicationDate":"2026-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/bbb.70169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148386721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the potential of ucuúba (Virola surinamensis) seed fat 探索ucuúba （vi罗拉苏里南ensis）种子脂肪的潜力

IF 3.8 4区生物学

Biofuels Bioproducts & Biorefining-Biofpr Pub Date : 2026-07-04 Epub Date: 2026-05-07 DOI: 10.1002/bbb.70175

Juan David Marmolejo Tascón, Eduardo Macedo de Melo, Jane Mara Block, Cristiano José de Andrade, Sandra Regina Salvador Ferreira

{"title":"Exploring the potential of ucuúba (Virola surinamensis) seed fat","authors":"Juan David Marmolejo Tascón, Eduardo Macedo de Melo, Jane Mara Block, Cristiano José de Andrade, Sandra Regina Salvador Ferreira","doi":"10.1002/bbb.70175","DOIUrl":"https://doi.org/10.1002/bbb.70175","url":null,"abstract":"Ucuúba (Virola surinamensis) fat is an important income source for Amazonian communities. Local businesses typically process whole seeds for fat extraction; however, seed structural integrity may influence extraction efficiency and fat quality. This study evaluated the effect of seed shelling as a preprocessing strategy on lipid recovery from ucuúba seeds. Fat samples extracted by pressing from whole (WUF) and shelled seeds (SUF) were characterized in terms of fatty acid composition, quality parameters (smoke point, acid value, free fatty acids, peroxide value, slip melting point, saponification value, unsaponifiable matter, iodine value), total phenolic content (TPC), antioxidant activity measured using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) assays, and thermal behavior measured by differential scanning calorimetry (DSC). Shelling increased fat yield, with SUF reaching 52.05% compared with 47.65% for WUF, thereby reducing residual press cake generation. Both samples presented similar quality and showed a predominance of saturated fatty acids, including myristic (72% to 73%) and lauric (17% to 18%). The WUF sample showed a higher TPC than SUF (6.54 and 5.82 mg GAE g−1, respectively), with correspondingly higher antioxidant activity, as determined by ABTS (4.26 μmol TE g−1) and DPPH (12.25 μmol TE g−1). Thermal analysis showed a distinct exothermic event during crystallization and a single endothermic peak upon melting. These results indicate that shelling enhances fat recovery but reduces phenolic content and antioxidant activity, potentially increasing operational costs. The compositional and thermal characteristics of ucuúba fat suggest its suitability for cosmetic and therapeutic applications within Amazonian bioeconomy value chains.","PeriodicalId":55380,"journal":{"name":"Biofuels Bioproducts & Biorefining-Biofpr","volume":"20 4","pages":"1950-1962"},"PeriodicalIF":3.8,"publicationDate":"2026-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/bbb.70175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148386387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 2.9 4区生物学

Biofuels Bioproducts & Biorefining-Biofpr Pub Date : 2026-05-10