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PENGEMBANGAN METODE ELEKTRODEPOSISI UNTUK PENGAMBILAN KEMBALI PERAK DARI LIMBAH FOTORONTGEN Kurniasih, Yeti
Indonesian Chemistry and Application Journal Vol 2, No 2 (2018)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/icaj.v2n2.p12-18

Abstract

Silver in its ionic form is one of the heavy metals dangerous if it is discharged into the environment or into the body of humans or other living things. Silver metal pollution sources, one of which comes from waste fixer which is a waste from the photorontgen process. However, silver in its metal form has a high economic value. Therefore, the development of techniques or methods of recovering silver from the waste solution and turning it into a metal form is important to do so that the metal does not pollute the environment and can be reused economically. One method that can be done is by electrolytic deposition or electrodeposition in which silver in the form of a silver thiosulfate complex compound in the photorontgen waste is converted to Ag metal through a redox reaction. To obtain good quality and quantity of silver deposits in the electrodeposition process, it is necessary to optimize several factors that influence, among others, optimization of potential difference, time and pH of the solution. This study aims to determine the effect of potential difference, time and pH of the solution on the efficiency of the electrodeposition process. Electrodeposition efficiency was determined based on the percentage of reduced silver mass calculated from the decrease in Ag concentration in photorontgen waste solution before and after the electrodeposition process. Based on the results of the study obtained the optimum electrodeposition process at a potential difference of 8 V for 75 minutes and the pH of the waste is 3, where the mass percent of silver which is reduced from waste is 86.49%.
Pemberdayaan Petani Jagung melalui Pengembangan Usaha Diversifikasi Produk Olahan Jagung di Labuapi Kabupaten Lombok Barat Kurniasih, Yeti; Ayu Dewi, Citra
Buletin Udayana Mengabdi Vol 18 No 3 (2019): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (213.922 KB) | DOI: 10.24843/BUM.2019.v18.i03.p08

Abstract

Secara umum masalah dan kendala utama yang dihadapi Petani Jagung di daerah Labuapi adalah belum adanya upaya dan pengembangan yang baik dalam usaha diversifikasi produk olahan jagung yang berdaya jual tinggi dan bernilai ekonomis. Kondisi ini dikarenakan masyarakat petani daerah Labuapi belum mengenal teknologi pengolahan tersebut. Selain itu, minat masyarakat terhadap pangan berbasis jagung masih rendah. Hal ini disebabkan oleh kurangnya pengetahuan sebagian masyarakat tentang nilai gizi jagung, tampilan produk pangan dari jagung yang kurang menarik, dan adanya anggapan bahwa jagung hanya dikonsumsi oleh masyarakat berekonomi lemah. Kegiatan KKN-PPM yang telah dilakukan ini bertujuan untuk meningkatkan keanekaragaman produk olahan jagung melalui penerapan teknologi pengembangan diversifikasi produk olahan jagung yang murah dan mudah diaplikasikan oleh petani jagung. Kegiatan KKN-PPM telah dilakukan selama 3 bulan pada semester genap tahun akademik 2016. Adapun kegiatan yang telah dilakukan meliputi: pembekalan KKN-PPM pada mahasiswa, pelatihan dan pendampingan secara langsung pada petani jagung dalam menghasilkan produk berupa diversifikasi olahan jagung seperti susu jagung, mie jagung, dodol jagung dan tempe jagung. Berdasarkan hasil pelatihan yang telah dilakukan didapatkan tingkat pemahaman dan keterampilan masyarakat (petani jagung) di Desa telagawaru memuaskan, sedangkan kualitas produk olahan jagung yang dihasilkan berhasil baik atau maksimal. Kata Kunci: Diversifikasi, Produk Olahan Jagung.
Efektivitas Penggunaan Biji Kelor (Moringa Oleífera, Lam) Sebagai Koagulan Untuk Menurunkan Kadar TDS dan TSS Dalam Limbah Laundry Hak, Ahsanul; Kurniasih, Yeti; Hatimah, Husnul
Hydrogen: Jurnal Kependidikan Kimia Vol 6, No 2 (2018): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (889.292 KB) | DOI: 10.33394/hjkk.v6i2.1604

Abstract

Laundry waste contains detergent which can cause water pollution because itcontains various kinds of substances that can affect various waterparameters, especially such as TDS (total dissolved solids) and TSS (totalsuspended solids). To reduce these parameters is done by the coagulationprocess which is adding moringa seed powder as coagulant. Moringa seedscan work as a coagulant because they contain an active substance, 4-alfa-4-rhamnosyloxy-benzil-isothiocyanate. The coagulation process was carried outby varying several coagulation parameters such as the size of the coagulantpowder (Al (80-100mesh) and A2 (100mesh), stirring speed (slow, medium,and fast), settling time (15, 45 and 75 minutes) and mass ratio to samplevolume (100 mg against 100, 150 and 200 mL) .The samples used in thecoagulation process were taken by grab sampling technique and thedetermination of TDS and TSS levels was carried out by the gravimetricmethod. The data showed the size of moringa seed powder coagulant, stirringspeed, settling time and coagulant mass ratio with sample volume influencethe% decrease in TDS and TSS levels, optimum conditions on coagulantpowder size> 100 mesh, moderate stirring speed, 15 minute deposition timeand coagulant mass ratio to sample volume 1: 1 ( mg / L), where% decreasein TDS is 74.07% from 270000 mg / L to 70000 mg / L and TSS of 82.14%from 56000 mg / L to 10000 mg / L.
PENGARUH PERBANDINGAN VOLUME FASA AIRDENGAN FASA ORGANIK DAN KONSENTRASI AgDALAMFASA AIR PADA EKSTRAKSI PERAKDARI LIMBAH FOTO ROENTGEN Minasari, Minasari; Kurniasih, Yeti; Ahmadi, Ahmadi
Hydrogen: Jurnal Kependidikan Kimia Vol 4, No 1 (2016): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (565.624 KB) | DOI: 10.33394/hjkk.v4i1.45

Abstract

Roentgen photo waste containing silver metal ion (Ag+) in form of silver thiosulfic complex ([Ag(S2O3)2]3-) that danger for health and environment. To prevent contamination to environment by silver metal from roentgen photo waste, separation become need to do. Solvent extraction was one of available separation technique on this case. The aim of this research was to evaluate the influence of few extraction parameters that was water-organic phase ratio and Ag concentration on water phase to silver extraction percentage, and apply optimum condition to roentgen photo waste sample. Silver extraction was applied on various water-organic phase ratios, there were 5 : 10; 10 : 10; 25 : 10; 50 : 10; and 75 : 10 mL and various silver concentration on water phase, there were 10, 20, 30, and 40 ppm. Ag+ ion concentration was measured by AAS in 328.22 nm wavelength before and after extraction process, than calculation of silver extraction percentage could be conducted. Based on research result, optimum condition of silver extraction was obtained on 1 : 2 of water-organic phase ratio and 10 ppm of Ag concentration on water phase. 10,27 % silver extraction was obtained on application of optimum extraction condition on roentgen photo waste.
PENGARUH PERBANDINGAN KONSENTRASI TBP : D2EHPA DAN KONSENTRASI PENGEMBAN DALAM FASAORGANIK PADA EKSTRAKSI PERAK DARI LIMBAH FOTO ROENTGEN Andika Putri, Novita Rusmayanti; Kurniasih, Yeti; Ahmadi, Ahmadi
Hydrogen: Jurnal Kependidikan Kimia Vol 4, No 2 (2016): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (526.134 KB) | DOI: 10.33394/hjkk.v4i2.92

Abstract

Photo roentgen used for examination of internal organs can produce wastes that are harmful to health and the environment because they containing silver metal ion(Ag+) inform of silver thiosulfate complex ([Ag(S2O3)2]-3). Therefore it was necessary for the separation of Ag metal so that the metal does not pollute the environment and can be used economically. One way to separate the metal Ag is by solvent extraction techniques. This study aimed to determine the effect of concentration ratio of TBP:D2EHPA and carrier compound concentration in the organic phase of the percent extraction of silver metal then applied to the sample photo roentgen waste. Extraction of the metals Ag done by varying the ratio of the combined carrier concentration of TBP and D2EHPA in kerosene by concentration ratio was 0: 1; 0.25: 0.75; 0.5: 0.5; 0.75: 0.25 and 1: 0 M as well as by varying the carrier concentration in the organic phase ranging from 0 M; 0.5 M; 1 M and 1.5 M. Measuring the concentration of metal ions Ag+in water phase before and after extraction was determined by atomic absorptionspectrophotometer (AAS) at a wavelength of 328,22 nm then calculated percent extraction. Based on the research that obtained the highest percent extraction on single used carrier compounds and compound concentration carrier D2EHPA in optimum water was 0.5 M with 58.22% percent extraction. Applications optimum conditions to the extraction of silver metal obtained from photo roentgenwaste percent extraction was 10.27%.
PENGARUH JENIS PELARUT DAN SENYAWA PENGEMBAN TERHADAP EFISIENSI PEMISAHAN LOGAM PERAK DENGAN TEKNIK MEMBRAN CAIR BERPENDUKUNG Bahri, Samsul; Kurniasih, Yeti; Ahmadi, Ahmadi
Hydrogen: Jurnal Kependidikan Kimia Vol 5, No 1 (2017): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (399.444 KB) | DOI: 10.33394/hjkk.v5i1.103

Abstract

Silver metal found in the metal plating industry wastewater, industrial process photography and X-ray film process. Wastes that still lack the metallic ions of silver if thrown in the water without further treatment would endanger the life of organisms, mainly bacteria, plants and living things, as silver metal is a metal that is toxic in dissolved form. One separation technique can be used with supported liquid membrane (SLM) technique. This study aimed to identify the type of solvent and carrier compound to percent transport of silver metal from the feed phase to phase receivers with SLM techniques. This type of research used in this study was an experimental research in the laboratory. Percent transport of metal ions Ag + with techniques SLM had done by varying the type of solvent was n-hexane, kerosene, toluene and chloroform to dissolve the compound carrier TBP and D2EHPA with each concentration 1 M. The concentration of the metal ions Ag+ in phase receiver after separation techniques SLM was measured by Atomic Absorption Spectrophotometer (AAS) at a wavelength of 328.1 nm, then the calculated percent metal Ag+ ion transport. Based on the results showed that the percent of the silver metal transport centipede on the use of solvent n-hexane and chloroform, with transport by 33.9% percent. While the percent of the highest transport to the use of compounds that was using the carrier of carrier compound TBP, with transport by 33.9% percent.
EFISIENSI ISOLASI MINYAK ATSIRI DARI KULIT JERUK DENGAN METODE DESTILASI AIR-UAP DITINJAU DARI PERBANDINGAN BAHAN BAKU DAN PELARUT YANG DIGUNAKAN Cahyati, Suci; Kurniasih, Yeti; Khery, Yusran
Hydrogen: Jurnal Kependidikan Kimia Vol 4, No 2 (2016): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.846 KB) | DOI: 10.33394/hjkk.v4i2.97

Abstract

Citrus nobilis L. peel was used as a source of essential oil production through water-stem distillation method. The aim of this research was to compare yield and quality of essential oil from Citrus nobilis L. peel obtained from ratio of 0,2; 0,4 and 0,6 of raw material mass and solvent volume during water-stem distillation. In each run, 1000 mL of water was applied as solvent, and the distillation was performed for 6 hours.. Results show that the best yield and quality of the produced essential oil was obtained on 400 gram/1000 mL ratio. This ratio produced essential oil in a yield of 2.18 %, 0.8484 gram/ mL density, yellowish oil with orange typical aroma, and viscous. GC-MS analysis results of the oil show the composition of Limonene 56,96%, α-Pinene 3,86%, β-Phellandrene 1,02%, β-Pinene 2,40%, β-Myrcene 2,76%, Linalool 7,69%, 3-Cyclohexene-1-methanol 2,04%, Nerol 1,44% and Benzenedicarboxylic acid 14,50%. 
Pengaruh Ukuran Serbuk Pada Aktivasi Tanah Liat Dari Tanak Awu Terhadap Daya Adsorpsinya Pada Pemurnian Minyak Goreng Bekas Nufida, Baiq Asma; Kurnia, Nova; Kurniasih, Yeti
Hydrogen: Jurnal Kependidikan Kimia Vol 2, No 2 (2014): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.201 KB) | DOI: 10.33394/hjkk.v2i2.660

Abstract

This research was aimed to get the effect of particel size of activated natural clay from Tanak Awu to their adsorption capacity for increase reused cooking oil quality. At previous research we done the activation of natural clay using acid (HCl) and got an optimal concentration of acid at 1 molar. Natural clay was grinding until particel size at 50 mesh, 60 mesh and 100 mesh then it was characterized in specific surface area by methylen blue methods and also acidity surface by acid base titration. Then activated natural clay was applied for purifying reused cooking oil by analyzing water content, acid number and peroxide number. The result showed that there are the effect of particel size of natural clay to acidity surface and specific surface area. While the adsorption capacity of natural clay on purifying reused cooking oil got that optimal particel size of activated natural clay at 60 mesh which getting the decrease of water content, acid number and peroxide number by following reach was 89,13%, 58,61% and 60,52%.
PEMISAHAN PERAK DARI LIMBAH FOTORONTGEN DENGAN TEKNIK MEMBRAN CAIR BERPENDUKUNG MENGGUNAKAN PENGEMBAN GABUNGAN TBP DAN D2EHPA Kurniasih, Yeti; Ahmadi, Ahmadi; Nufida, Baiq Asma
Hydrogen: Jurnal Kependidikan Kimia Vol 8, No 1 (2020): Hydrogen: Jurnal Kependidikan Kimia
Publisher : IKIP Mataram

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

Abstract

The photorontgen process produces waste that is harmful to the environment because it contains silver ions that are toxic to living organisms. The silver content in photorontgent waste is 2000 mg / L, while the permissible threshold value for silver in aquatic is 0.1 - 1.0 mg / L, so the disposal of photorontgent waste into the waters will be dangerous. However, silver metal has high economic value so that silver metal separation from x-ray waste is required, in addition to reducing the environmental burden due to silver metal pollution, it is also expected to reuse the silver metal economically. The technique of separation that can be used is a supported liquid membrane (Supported Liquid Membrane, SLM). This technique has the advantage that its separation process is relatively easy because the extraction and stripping process takes place in one stage, the carrying solution as extractant is more stable in the supporting membrane and the amount of extractant required is small. This research studies the effect of waste dilution factors on the effieciency separation of silver from photorontgen waste. Separation was carried out at the optimum SLM condition by using combined carrier compound TBP and D2EHPA with a ratio of 0.25: 0.75, total concentration of 1 M in kerosene and 0.1 M HNO3 as stripping phase. Sample waste was diluted by a factor dilution 25, 50, 75 and 100 times. Measurement of metal content before and after separation is done with AAS. The results showed that the waste dilution factor influenced the efficiency of silver trasnpor through SLM. Percent of silver separation was obtained 21.33% in waste with 100 times dilution.
PEMBUATAN KITOSAN DARI CANGKANG UDANG DAN APLIKASINYA SEBAGAI ADSORBEN UNTUK MENURUNKAN KADAR LOGAM CU Agustina, Sry; Kurniasih, Yeti
Prosiding Seminar Nasional MIPA 2013: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2013
Publisher : Prosiding Seminar Nasional MIPA

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

Abstract

Abstrak Kitosan merupakan modifikasi dari senyawa kitin yang banyak terdapat dalam kulit luar hewan golongan rustaceae seperti udang, lobster dan kepiting. Salah satu sumber daya alam di bidang perikanan yang sangat melimpah adalah udang. Selama ini pemanfaatan cangkang udang hanya terbatas sebagai pakan ternak dan bahkan dibiarkan begitu saja sampai membusuk sehingga menggangu estetika lingkungan. Penelitian ini bertujuan untuk mengetahui seberapa besar rendemen serta kualitas kitin dan kitosan yang dihasilkan dari cangkang udang serta untuk mengetahui seberapa besar kapasitas adsorpsi kitosan dari cangkang udang sebagai adsorben untuk menurunkan kadar logam Cu. Tahap pembuatan kitosan meliputi: tahap demineralisasi dengan HCl 1,5M, tahap deproteinasi dengan NaOH 3,5% serta tahap deasetilasi dengan NaOH 60%. Selanjutnya kitosan yang diperoleh dikarakterisasi dan ditentukan kapasitas adsorpsinya terhadap ion logam Cu. Kadar Cu pada sampel sebelum dan sesudah diadsorpsi diukur dengan AAS (Atomic Absorption Spectroscopy). Dari hasil penelitian diperoleh karakterisasi kitosan sebagai berikut: rendemen 67,08%, memiliki tekstur serbuk bewarna putih, tidak berbau, memiliki kadar air 1,55% serta larut sempurna dalam asam asetat glasial 2%. Kitosan yang diperoleh dari hasil penelitian mampu mengadsorpsi logam Cu sampai konsentrasi 100 ppm dengan persen adsorpsi sebesar 90,37%.