Articles

Found 5 Documents
Search

EKSTRAKSI Cu DENGAN LIGAN N,N’-BUTIL-BIS-(2-PIKOLINAMIDA) MENGGUNAKAN METODE TRANSPORT MEMBRAN CAIR Martini, Tri; Masykur, Abu; Wibowo, Atmanto Heru; Pudiastuti, Weny
Alchemy Jurnal Penelitian Kimia Vol 4, No 2 (2005)
Publisher : Alchemy Jurnal Penelitian Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Telah dilakukan penelitian tentang ekstraksi Cu dengan ligan N,N’-butil-bis(2-pikolinamida) menggunakan metode transport membran cair. Penelitian ini bertujuan untuk mengetahui selektivitas ligan N,N’-butil-bis(2-pikolinamida) dalam ekstraksi Cu terhadap logam pengganggu menggunakan metode transport cair,untuk itu perlu ditentukan kondisi optimum ekstraksi meliputi pH fase sumber, konsentrasi ligan, pH fase penerima, jenis asam di fasa penerima dan waktu transport.Ekstraksi dilakukan menggunakan gelas sel tipe U, pH fase sumber (2,0 – 8,7), konsentrasi ligan (1.10-5 – 1.10-2 )M , Konsentrasi H2SO4 di fase penerima (5.10-4 – 5,00 ) M, jenis asam di fasa penerima yaitu HCl, H2SO4 , dan HNO3 pada pH 1,6 , dan waktu transport (1 – 30) jam, ion penggangu yang diujikan yaitu Co2+.Ni2+ ,dan Zn2+. Penentuan konsentrasi logam dengan AAS.Hasil penelitian menunjukkan bahwa kondisi optimum ekstraksi Cu dengan ligan N,N’-butil-bis(2-pikolinamida) menggunakan metode transport membran cair yaitu : pH fase sumber 7,6 , konsentrasi ligan 1.10-3 M, konsentrasi H2SO4 di fase penerima 5.10-2 M dan waktu transport 24 jam. Hasil uji selektivitas menunjukkan bahwa ligan N,N’-butil-bis(2-pikolinamida) selektip terhadap ion Cu . Ukuran selektivitas ferhadap logam pengganggu dalam transport tunggal dan bersaingan adalah Co2+> Ni2+> Zn2+ . Hasil penelitian juga menunjukkan jumlah mol ligan (n) dalam kompleks Cu-N,N’-butil-bis(2-pikolinamida) adalah 1.
Synthesis and Thermal-Stability Study of Polybutylene Itaconate Modified with Divinyl Benzene and Glycerol Wibowo, Atmanto Heru; Makhnunah, Ninis; Irawati, Deny; Purnawan, Candra; Nurhayati, Nanik Dwi; Storz, Henning
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.802 KB) | DOI: 10.22146/ijc.21240

Abstract

Polybutylene itaconate (PBI) for modification with divinyl benzene (DVB) and glycerol has been synthesized at 180 °C for 3 h via polycondensation of itaconic acid (IA) and butanediols using catalyst of Ti(OBu)4. Modification on PBI was done with addition of 15%, 20% and 25% DVB (w/w) using benzoyl peroxide. With glycerol, weight variations of glycerol:1,4-butanediol (BDO) in the synthesis were 10%, 30%, and 50% (mole/mole). PBI and PBI modified with DVB and glycerol were characterized with FTIR and TG-DTA. PBI showed a wavenumber shift from 1703 cm-1 to 1728 cm-1 of the C=O functional group from acid to esther. The DVB modification on PBI also showed that the intensity decrease of C=C stretching was due to the formation of crosslinking on the double bond. In the modification with glycerol, three dimensional networking on the polyester occurred through bonding between hydroxyl of glycerol and acid group of IA. Constant intensity of C=C stretching on polyester was seen. The thermal stability of PBI modified with DVB increased, accompanied by rigidity change of the structure. The thermal stability of PBI modified with glycerol decreased, caused by the decrease of regularity degree and the elasticity increase of the three dimensional structure of polyester.
The Fermentation of Green Algae (Spirogyra majuscule Kuetz) using Immobilitation Technique of Ca-Alginate for Saccharomyces cerevisiae Entrapment Wibowo, Atmanto Heru; Mubarokah, Lailatul; Suratman, Adhitasari
Indonesian Journal of Chemistry Vol 13, No 1 (2013)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2584.791 KB) | DOI: 10.22146/ijc.21319

Abstract

A study of batch fermentation of green algae (Spirogyra majuscula Kuetz) from Pengging Lake, Boyolali, Central Java for bioethanol source using immobilization technique of Ca-alginate for Saccaromyces cerevisiae entrapment has been done. The scope of the study emphasized on the best condition for the processes of hydrolysis and fermentation. Concentration of sulfuric acid and hydrolysis time were varied with 0.1, 0.2, 0.3, 0.4 and 0.5 M for 30, 90, 150, 210, 270, 330, 360, 390, 420, and 450 min to obtain the maximum glucose content of UV analysis. Na-alginate : yeast ratio and fermentation time were varied with 1:5, 2:4, 3:3, 4:2 and 5:1 (w/w) for 1, 2, 3, 4, 5, 6 and 7 days. Distillation at 70-80 °C was deployed to purify the fermentation product. The ethanol content in the product was analyzed using gas chromatography-flame ionization detector (GC-FID). The result of study showed that maximum glucose content was obtained 2.1% from 0.2 M sulfuric acid for 6 h of hydrolysis. Maximum ethanol content was obtained 54.1% from 2:4 ratio of Na-alginate : yeast (w/w) for 4 days of fermentation. The study also concludes that immobilization technique of Ca-alginate increase alcohol content compared to without immobilization of green-algae fermentation.
Pelapisan Urea dengan Arang Aktif yang Diperkaya Mikroba Indegenus dapat Menurunkan Konsentrasi Endrin Wahyuni, Sri; Indratin, Indratin; Dewi, Widyatmani Sih; Wibowo, Atmanto Heru
Bioedukasi: Jurnal Pendidikan Biologi Vol 9, No 1 (2016): BIOEDUKASI
Publisher : Department of Biology Education Faculty of Teacher Training and Education Sebelas Maret Un

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/bioedukasi-uns.v9i1.3882

Abstract

Endrin residues are still remain in the  land field these compounds are no longer used by farmers and have been banned by the government. This residue can stay in the soil longer and persistant. Microbial enrichment is expected to accelerate the degradation of pesticide residues. Microbes stretcher are Bacillus substillis, Heliothrix oregonensis, Catenococcus thiocycli, and Achoromobacter sp obtained from the preliminary research results  from soil isolation of idegenus in LIPI Cibinong Microbiology Laboratory.  Soil for the planting medium obtained from the village of Karawang, Regency Cilamaya Wetan, Cilamaya District. The experiment was conducted in the field by using lysimeter at the Experiment Jakenan station from July 2013 to December 2013. The objective of the was to obtain technology of activated carbon-coated urea and biochar which  enriched microbial indegenus. The experiment was used randomized block design (RCBD) with 3 replications.  Plant used are rice. Insecticide residue analysis was carried out in the laboratory in Bogor Balingtan using gas wchromatography (GC), with the SNI method 06-6991.1-2004. The purpose of this study knowing the capabilities of urea coating with activated carbon enrichment microbia in reducing the concentration of residues endrin. The  objective were urrea coated activated carbon from coconut shell were enriched with microbes on paddy field can lower pesticide residues of endrin until 33.65%.  This carbon as the preferred home. Enrichmentwith microbial indegenuscan improve theeffectivenessof ureacoating biochar andureacoatingactivated carbon coconut shell todecrease concentration of endrin.
Pengaruh Natrium Terhadap Adsorpsi Lithium Pada Proses Pengendapan Menggunakan Mangan Hidroksida Yunita, Fariza Eka; Lalasari, Latifa Hanum; Ardhi, Bagaskoro Pranata; Wibowo, Atmanto Heru
Prosiding Semnastek PROSIDING SEMNASTEK 2019
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Litium mangan oksida atau LMO (LiMn2O4) merupakan salah satu senyawa litium yang digunakan sebagai katoda baterai. Pada penelitian sebelumnya, diketahui bahwa LMO dapat dipreparasi menggunakan metode presipitasi di dalam fasa aqueous menggunakan prekursor anorganik. Serangkaian percobaan dilakukan untuk menyelidiki proses adsorpsi litium dalam campuran LiCl, MnSO4, NH4OH serta pengaruh ion natrium terhadap proses tersebut. Mangan sulfat dengan massa 25 gram dilarutkan dalam 200 ml air distilasi dengan ammonia sesuai perhitungan stoikiometri. Larutan ini kemudian ditambahkan LiCl serta NaCl dengan berbagai variasi perbandingan konsentrasi dan diaduk selama 1 jam. Residu yang dihasilkan kemudian dikeringkan dan dikalsinasi. Hasil penelitian menunjukkan bahwa adsorpsi ion litium pada proses pengendapan mangan hidroksida akan terganggu dengan penambahan natrium. Selektivitas adsorpsi ion litum akan menurun seiring dengan penambahan konsentrasi ion natrium, sehingga diharapkan prekursor yang akan digunakan dalam sintesis katoda LMO harus bebas dari unsur-unsur pengotor lainnya terutama natrium.