F Febiyanto
My research interests are semiconductor based materials, photocatalysis and wastewater treatments. Recently, I am conducting a research focus in silver phosphate based photocatalyst for the dye and organic molecules photodegradation under visible light irradiation. The research has been investigated by enhancing and predicting the specific morphology-activated photocatalytic activities of silver phosphate material under the addition of the organic polimers, surfactants, and/or solvents.
Supervisors: Prof. Indriana Kartini and Prof. Eko Sri Kunarti
Address: Jawa Barat Indonesia.
Supervisors: Prof. Indriana Kartini and Prof. Eko Sri Kunarti
Address: Jawa Barat Indonesia.
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have not yet been identified thoroughly. The soil is
estimated to contain nanoscale natural clays, such as
halloysite or imogolite. The occurrence of nanoclays in
the soil will support the development of many applica-
tions in nanotechnologies from nature. The objective of
the present study was to characterize soil samples from
five different locations around the volcano at three dif-
ferent depths from the soil surface. A total of 50 g of dry
soil sample was stirred slowly in 300 mL of distilled
water. Stirring was stopped after the addition of 10 mL
of 30% H2O2 and then allowed to stand for 24 h. The
small floating particles with dimensions of <2 μm were
separated from the mixture and collected using a centri-
fuge at 4000 rpm (1790×g) for 30 min. About 5 g of
solid sample was obtained for further characterization.
X-ray diffraction results showed the presence of
halloysite, allophane, and kaolinite. Morphology ana-
lysis by scanning and transmission electron microscopy
of some representative samples showed short tubes 10–
20 nm in diameter and 50–100 nm long with the
halloysite structure. Halloysite was found at 70 cm
depth from the soil surface at almost all locations. The
surface area determined by the surface area analyzer
using the BET equation was as much as 112.51 m2
/g. This surface area is thought to be the largest ever deter-
mined for a natural nanoclay, paving the way for future
application as catalytic or photocatalytic-supporting
materials.
maintained from air pollution because almost 90% of people living in the room. The air pollution in the room arising
from the activity of people in industrial and transportation sectors. This was reported by EPA in 1989 that study of
indoor air pollution is more severe than the outdoors. It reduce the labor productivity up to US $10 billion. People
generally use Air Conditioner (AC) and air freshener to decrease the bad smell in the room. However, use of Air
Conditioner has a bad impact because it contains Chlor (Cl) like Freon and CFC (Chlorofluorocarbon). It was
decreasing the ozon layer causing global warming. Then, it also consumses of 45-66% electrical energy. The
alternative solution to solve this problem is to use activated carbon as adsorbent which is more saving energy and
friendly technology. The use of activated carbon is one application of Green Building. The activated carbon is a good
adsorbent for purification, decreasing dye and smell, dechlorination, detoxification, filtration, separation as well as a catalyst. The activated carbon has long been studied because its ability to absorb the air pollution. For example, Basuki
(2007), make a media-coated exhaust activated carbon without the insertion of TiO2 can reduce HC air pollution with
long media 5,10 and 15 cm are 142,67; 122,67 and 90,67 ppm respectively, from initial concentration 663 ppm.
Whereas, SO2 gas can be decreased to 477,950; 367,353; 215,95 μg/m3 respectively, from initial concentration 930,41
μg/m3 etc.The activated carbon with a specific method can be packed into a painting. Through the use of activated
carbon as a panting not only can absorb the odors but also improve the aesthetics of the room (2 in 1).
a co-preciptation method by mixing H3PO4 ethanol solution and AgNO3 ethanol aqueous
solution, where the percentage of ethanol in AgNO3 ethanol aqueous solution was varied at 0, 50,
80, 90 and 100 % (v/v). The photocatalytic performance of the synthesized samples was
evaluated by photodegradation of Rhodamine B (RhB) under blue light irradiation (λ=455 nm).
The results showed that the morphology of the Ag3PO4 particles greatly changed depending on
the ethanol content in the reaction solution. Excellent photocatalytic activity was observed at 80 %
(v/v) of ethanol, where the Ag3PO4 showed saddle-like morphology derived from the tetrahedron
structure.
compared to the pure Ag3PO4 under visible light irradiation. The enhanced photocatalytic activity could be attributed to the effective separation of hole (+) and electron pairs in the iron oxide-silver orthophosphate composite.
have not yet been identified thoroughly. The soil is
estimated to contain nanoscale natural clays, such as
halloysite or imogolite. The occurrence of nanoclays in
the soil will support the development of many applica-
tions in nanotechnologies from nature. The objective of
the present study was to characterize soil samples from
five different locations around the volcano at three dif-
ferent depths from the soil surface. A total of 50 g of dry
soil sample was stirred slowly in 300 mL of distilled
water. Stirring was stopped after the addition of 10 mL
of 30% H2O2 and then allowed to stand for 24 h. The
small floating particles with dimensions of <2 μm were
separated from the mixture and collected using a centri-
fuge at 4000 rpm (1790×g) for 30 min. About 5 g of
solid sample was obtained for further characterization.
X-ray diffraction results showed the presence of
halloysite, allophane, and kaolinite. Morphology ana-
lysis by scanning and transmission electron microscopy
of some representative samples showed short tubes 10–
20 nm in diameter and 50–100 nm long with the
halloysite structure. Halloysite was found at 70 cm
depth from the soil surface at almost all locations. The
surface area determined by the surface area analyzer
using the BET equation was as much as 112.51 m2
/g. This surface area is thought to be the largest ever deter-
mined for a natural nanoclay, paving the way for future
application as catalytic or photocatalytic-supporting
materials.
maintained from air pollution because almost 90% of people living in the room. The air pollution in the room arising
from the activity of people in industrial and transportation sectors. This was reported by EPA in 1989 that study of
indoor air pollution is more severe than the outdoors. It reduce the labor productivity up to US $10 billion. People
generally use Air Conditioner (AC) and air freshener to decrease the bad smell in the room. However, use of Air
Conditioner has a bad impact because it contains Chlor (Cl) like Freon and CFC (Chlorofluorocarbon). It was
decreasing the ozon layer causing global warming. Then, it also consumses of 45-66% electrical energy. The
alternative solution to solve this problem is to use activated carbon as adsorbent which is more saving energy and
friendly technology. The use of activated carbon is one application of Green Building. The activated carbon is a good
adsorbent for purification, decreasing dye and smell, dechlorination, detoxification, filtration, separation as well as a catalyst. The activated carbon has long been studied because its ability to absorb the air pollution. For example, Basuki
(2007), make a media-coated exhaust activated carbon without the insertion of TiO2 can reduce HC air pollution with
long media 5,10 and 15 cm are 142,67; 122,67 and 90,67 ppm respectively, from initial concentration 663 ppm.
Whereas, SO2 gas can be decreased to 477,950; 367,353; 215,95 μg/m3 respectively, from initial concentration 930,41
μg/m3 etc.The activated carbon with a specific method can be packed into a painting. Through the use of activated
carbon as a panting not only can absorb the odors but also improve the aesthetics of the room (2 in 1).
a co-preciptation method by mixing H3PO4 ethanol solution and AgNO3 ethanol aqueous
solution, where the percentage of ethanol in AgNO3 ethanol aqueous solution was varied at 0, 50,
80, 90 and 100 % (v/v). The photocatalytic performance of the synthesized samples was
evaluated by photodegradation of Rhodamine B (RhB) under blue light irradiation (λ=455 nm).
The results showed that the morphology of the Ag3PO4 particles greatly changed depending on
the ethanol content in the reaction solution. Excellent photocatalytic activity was observed at 80 %
(v/v) of ethanol, where the Ag3PO4 showed saddle-like morphology derived from the tetrahedron
structure.
compared to the pure Ag3PO4 under visible light irradiation. The enhanced photocatalytic activity could be attributed to the effective separation of hole (+) and electron pairs in the iron oxide-silver orthophosphate composite.
22,48% hemiselulosa dapat dihidrolisis menjadi xilosa kemudian dihidrogenasi
menjadi gula rendah kalori xilitol.
Karya tulis ini dibuat dengan tujuan untuk memberikan wawasan serta
informasi pemanfaatan limbah sekam padi yang dapat dioptimalkan untuk
dijadikan gula bagi penderita diabetes. Mengupayakan kehidupan yang lebih sehat
melalui inovasi gula rendah kalori (xilitol) dari limbah sekam padi bagi penderita
diabetes. Mengoptimalkan potensi limbah sekam padi yang saat ini belum bisa
dimanfaatkan.
Metode penulisan yang digunakan dalam proses penyusunan karya tulis ini
adalah dengan metode pengumpulan data, proses penyeleksian dan konsultasi
dengan dosen ahli, diskusi dan uraian singkat, kemudian data yang sudah
didapatkan diolah, disusun secara sistematis, kemudian ditarik kesimpulan.
Pemanfaatan limbah sekam padi sebagi gula bagi penderita diabetes ditujukan
bagi seluruh masyarakat Indonesia khusunya bagi penderita diabetes yang
menginginkan kehidupan yang lebih sehat tanpa gula tinggi kalori. Langkah yang
diambil untuk mencapai tujuan ini yakni pertama, identifikasi bahan dalam skala
riset sehingga dihasilkan produk yangs sesuai; kedua, pengujian produk ke
lembaga pemerintahan seperti Kemenkes dan BPOM agar layak konsumsi melalui
uji klinis; ketiga, menjalin kerja sama dengan pihak indutri dalam memproduksi
xilitol.
bahan bangunan. Namun, pemanfaatan biji ketapang khusunya menjadi minyak saat ini belum diterapkan di masyarakat Cilacap sehingga biji ketapang terbuang
percuma atau manfaatnya belum bisa dimaksimalkan. Minyak Ketapang (MiyKe) menjadi solusi yang tepat guna dengan mengkonversi biji ketapang menjadi
minyak goreng sebagai pemecah masalah sekaligus sumber alternatif. Karya tulis ini bertujuan merumuskan konsep untuk menyadarkan masyarakat daerah Cilacap akan kebermanfaatan biji.Penginformasian gagasan ini
dilaukan beberpa tahap. Pertama adalah dengan sosialisasi kepada masyarakat Cilacap. Tahap kedua adalah dengan pendidikan dan pembinaan. Pada tahap ke
tiga adalah dilakukannya proses produksi baik dari segi kecil-menengah bagi masyarakat kekuatan potensial kecil atau bahkan menengah ke atas bagi masyarakat yang mampu secara mandiri dan potensi yang dimilki. Terakhir
adalah proses pendampingan yang di dalamnya mencakup pengawasan dan media konsultasi. Gagasan ini ditulis dengan dengan analisis dari beberapa permasalahan yang terjadi didaerah Cilacap, yang dikombinasi dengan solusi logis berdasarkan tinjauan pustaka yang ada.
Latar belakang daerah Cilacap yang mendukung serta diterapkannya gagasan ini dapat menjadi solusi dalam pemecahan masalah biji ketapang yang kurang termanfaatkan. Produk yang dihasilkan bisa menjadi sumber alternatif selain pengunaan minyak goreng dari kelapa sawit serta bisa menjadi sarana perkembangan indutrial di kawasan tersebut yang mampu membuka lapangan pekerjaan baru sehingga meningkatkan pendapatan daerah di Cilacap
ix
didoping dan dikombinasikan dengan suatu material adsorben seperti karbon aktif sehingga dapat bekerja maksimal dibawah sinar tampak. Mekanisme penurunan kadar polutan udara menggunakan ACe pada filter ventilasi yakni ketika nano-TiO2 terdoping yang dikombinasikan dengan karbon aktif diaktivasi menggunakan sinar (hv) pada panjang gelombang tertentu akan menghasilkan elektron spesis kimia (e-) dan hole (h+). Hole (h+) akan berinteraksi dengan uap air (H2O) di udara menghasilkan OH radikal (•OH) yang bersifat sebagai oksidator kuat. Elektron (e-) akan bereaksi dengan O2 di udara membentuk radikal superoksida (•O2-) yang bersifat sebagai reduktor. Spesis radikal kimia yang dihasilkan bersama-sama akan digunakan untuk mendegradasi polutan udara yang akan masuk ke dalam ruangan melalui sistem filter ventilasi. Pemanfaatan Air Cleaning System (ACe) menggunakan nano-TiO2 terdoping yang dikombinasikan dengan karbon aktif yang dipasang pada sistem ventilasi akan dapat menurunkan kadar polutan udara sehingga udara menjadi bersih dan lebih sehat bagi penghuni bangunan atau rumah.
asetat, asam sulfida sehingga mengurangi kemampuan lingkungan dan mengganggu lingkungan. Teknologi untuk memecahkan masalah ini sangat penting dimana dampak buruk dari kadar BOD dan COD yang tinggi di lingkungan. Teknologi berbasis fotokatalis TiO2 yakni dengan melapisi reaktor dengan fotokatalis TiO2. TiO2 disinari cahaya UV dengan energi yang sesuai maka akan terbentuk pasangan elektron–hole (e- dan h+, elektron dan lubang positif) pada permukaan lapisan. Lubang positif (hole) yang terbentuk akan berinteraksi dengan air atau ion OH- menghasilkan radikal hidroksil (·OH). Radika hidroksil ini merupakan spesies yang sangat reaktif menyerang molekul-molekul organik dan dapat mendegradasinya menjadi CO2 dan H2O (dan ion halida jika molekul organik mengandung halogen) (Linsebigler, 1995). Dengan menggunakan TiO sebagai fotokatalis yang dijadikan sebuah lapisan reaktor bisa mendegradasi kandungan dari limbah cair tahu dimana masih tertinggal sehingga penurunan COD dan BOD bisa dioptimalisasi dan tidak berbahaya bagi lingkungan.