Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Thamrin Usman"'
Publikováno v:
Indonesian Journal of Chemistry, Vol 24, Iss 3, Pp 691-700 (2024)
Deep eutectic solvents (DES) were prepared by precise combinations of mol fractions of chemical compounds, resulting in a lowered melting point due to hydrogen bonding. This research aimed to elucidate the physicochemical attributes of DES and its ef
Externí odkaz:
https://doaj.org/article/48a0ada671e440f2965f9deeed54127e
Publikováno v:
EduChemia, Vol 9, Iss 2 (2024)
Abstract: The relatively high content of free fatty acid in crude palm oil inhibits the direct synthesis of biodiesel in crude palm oil. The use of a bifunctional solid heterogeneous catalyst allows for simultaneous transesterification-esterification
Externí odkaz:
https://doaj.org/article/76ff0e47e2a3495199ed03a64fc3a56b
Publikováno v:
Jurnal Presipitasi, Vol 20, Iss 2, Pp 267-279 (2023)
Methyl esters synthesis from bleached crude palm oil (BCPO) containing 0.36 and 20.86% of free fatty acids using Sn-zeolite and red mud has been done. This study aims to determine the esterification, transesterification, and transesterification-ester
Externí odkaz:
https://doaj.org/article/943a3b581f5a451daaaad73383c45c36
Publikováno v:
Jurnal Kelautan Tropis, Vol 24, Iss 3, Pp 311-322 (2021)
Shrimp is one of the aquatic organisms that contain several active compounds, including astaxanthin. Cincalok is one of the fermented shrimp products containing astaxanthin. This study aims to determine the characteristics of astaxanthin extract from
Externí odkaz:
https://doaj.org/article/2cebe2a89c444f7c92081a6068e9a379
Autor:
Winda Rahmalia, Imelda H. Silalahi, Thamrin Usman, Jean-François Fabre, Zéphirin Mouloungui, Georges Zissis
Publikováno v:
Materials for Renewable and Sustainable Energy, Vol 10, Iss 2, Pp 1-10 (2021)
Abstract In this research, treated metakaolinite (TMK) was introduced into the TiO2 photoelectrode to fabricated dye-sensitized solar cells (DSSCs). The photovoltaic cells have four main natural components, i.e., a photosensitizer (carotenoid bixin),
Externí odkaz:
https://doaj.org/article/6d39b14f2ec64230aeb25bf4b2835aa0
Autor:
Winda Rahmalia, Septiani Septiani, Uray Amira Naselia, Thamrin Usman, Imelda Hotmarisi Silalahi, Zéphirin Mouloungui
Publikováno v:
Indonesian Journal of Chemistry, Vol 21, Iss 3, Pp 669-678 (2021)
Bixin is one of the potential natural sensitizers used in dye-sensitized solar cells (DSSCs). In this study, bixin was complexed with Cu(II) and Zn(II) to increase its stability. The formation of the complexes was indicated by shifting peaks absorpti
Externí odkaz:
https://doaj.org/article/224e0d69082c47e1b7b5434757ead202
Publikováno v:
Positron, Vol 10, Iss 1, Pp 19-26 (2020)
TiO2 (titanium dioksida) merupakan satu di antara material semikonduktor yang banyak dipelajari karena sifat optik dan elektroniknya yang baik. Secara struktur, TiO2 mempunyai tiga fase kristal yaitu anatase, rutile, dan brookite. Dari ketiga fase te
Externí odkaz:
https://doaj.org/article/78541b22271b4f4ca906a979c4b42f38
Publikováno v:
Indonesian Journal of Chemistry, Vol 20, Iss 4, Pp 791-800 (2020)
This study aims to prepare dealuminated metakaolinite which has a high surface area by using NH4OH as an activator. The natural kaolinite sample was treated at 600 °C for 6 h in order to obtain metakaolinite. A dealuminated metakaolinite was then pr
Externí odkaz:
https://doaj.org/article/581725063a9946b39819085ed664a536
Publikováno v:
Bioinorganic Chemistry and Applications, Vol 2018 (2018)
The adsorption of bixin in aprotic solvents onto acid- and alkali-treated kaolinite was investigated. Kaolinite was treated three times, for 6 h each, with 8 M HCl or 5 M KOH. The adsorbents were characterized by XRD, FT-IR, EDS, and BET-N2. The effe
Externí odkaz:
https://doaj.org/article/6062f09351484fa5835eb240c9a49846
Publikováno v:
Indonesian Journal of Chemistry, Vol 9, Iss 3, Pp 491-499 (2010)
Esterification of fatty acids from palm oil waste (sludge oil) as biodiesel liquid base has been done by using alum [Al2(SO4)3.14H2O] catalyst. Some reaction variables like reaction time, catalyst quantity, and molar ratio of sample-reactant was appl
Externí odkaz:
https://doaj.org/article/08796dd83ea5480aa265c701ebc65892