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All Journal Majalah Kulit, Karet, dan Plastik

Christiana Maria Herry Purwanti, Christiana Maria Herry

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Engineering

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Optimasi waktu reaksi pembentukan kompleks indofenol biru stabil pada uji n-amonia air limbah industri penyamakan kulit dengan metode fenat Murti, Rihastiwi Setiya; Purwanti, Christiana Maria Herry
Majalah Kulit, Karet, dan Plastik Vol 30, No 1 (2014): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Optimization of the reaction time on the formation of indofenol blue complex for N-Ammonia analysis in the tannery wastewater using phenate method has been carried out. The aim of the study was to determine the optimum time for complex formation ofÂ indophenol blue. Variations of reaction time were 1; 2; 2,5; 3; and 21 hours. Accuracy and precision were evaluated to determine the feasibility of developing the method. Analysis of N-Ammonia was done by using a spectrophotometry at a wavelength of 630 nm. Optimum reaction time on the formation of indofenol blue complex for ammonia analysis in the tannery wastewater was achieved at a minimum time of 2 hours at the temperature test of 25oC. The accuracy and relative percent different were 90-97% and <5% respectively, met the SNI-6989.30-2005 so that the method was feasible to be developed and used in the laboratory.ABSTRAKTelah dilakukan penelitian optimasi waktu reaksi pembentukan kompleks indofenol biru pada pengujian N-Amonia dalam limbah cair industri penyamakan kulit menggunakan metode Fenat. Penelitian ini bertujuan untuk menentukan waktu optimum untukÂ pembentukan kompleks indofenol biru. Variasi yang dilakukan adalah waktu reaksi yaitu 1 jam, 2 jam, 2,5 jam, 3 jam, dan 21 jam. Akurasi dan presisi juga dievaluasi untuk mengetahui kelayakan pengembangan metode. Analisis N-Amonia dilakukan dengan menggunakan spektrofotometri pada panjang gelombang 630 nm. Waktu reaksi optimum pembentukan kompleks indofenol biru pada pengujian amonia dalam limbah cair industri penyamakan kulit dicapai pada waktu minimal 2 jam pada suhu uji 25oC. Nilai akurasi sebesar 90-97% dan relative percent different < 5% memenuhi SNI-6989.30-2005 sehingga metode ini layak untuk dikembangkan dan digunakan di laboratorium.

Adsorpsi amonia dari limbah cair industri penyamakan kulit menggunakan abu terbang bagas Murti, Rihastiwi Setiya; Purwanti, Christiana Maria Herry; Suyatini, Suyatini
Majalah Kulit, Karet, dan Plastik Vol 29, No 2 (2013): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

ABSTRACTThe aim of this study is to reduce ammonia concentration in tannery wastewater using bagasse fly ash in a batch adsorption system. Experiments were conducted to study the effect of various parameters such as adsorbent dose and contact time. Data analysis was performed by calculating the efficiency of adsorption and fitting the data into Freundlich and Langmuir isotherm models. Correlation coefficient and mean squared error were used to evaluate the performance of the models. From the results, it was found that the operating conditions to achieve an optimum removal efficiency of 45.72% are 1 hour contact time and 2 grams of bagasse fly ash. The results also indicate that the data fits Langmuir model well where Langmuir constant Qo, b, and correlation coefficient were found to be 0.706 mg/g, 0.209 L/mg, and 0.9424, respectively.Keywords: Ammonia, adsorption, bagasse fly ash, tannery wastewaterABSTRAKPenelitian ini bertujuan untuk mengurangi kadar amonia dalam limbah cair industri penyamakan kulit menggunakan abu terbang bagas secara batch. Variasi percobaan secara batch yaitu berat abu terbang bagas dan waktu adsorpsi. Analisis data dilakukan dengan penghitungan efisiensi penjerapan dan memasukkan data ke persamaan isotherm Freundlich dan Langmuir. Koefisien korelasi dan mean squared error digunakan untuk mengevaluasi model terbaik. Kondisi optimum adsorpsi amonia secara batch dalam penelitian ini berada pada waktu kontak 1 jam, berat abu terbang bagas 2 gram, dan efisiensi penjerapan 45,72%. Persamaan yang cocok untuk menggambarkan adsorpsi amonia dalam limbah cair industri penyamakan kulit menggunakan abu terbang bagas ini adalah persamaan Langmuir. Konstanta persamaan Langmuir Qo, b, dan koefisien korelasi yang diperoleh masing-masing 0,706 mg/g, 0,209 L/mg, dan 0,9424.Kata kunci: Amonia, adsorpsi, abu terbang bagas, limbah cair industri penyamakan kulit

Pembuatan bahan penyamak nano nabati dan aplikasinya dalam penyamakan kulit Herminiwati, Herminiwati; Waskito, Sri; Purwanti, Christiana Maria Herry; Prayitno, Prayitno; Ningsih, Dwi
Majalah Kulit, Karet, dan Plastik Vol 31, No 1 (2015): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

This study aimed to create nano vegetable tanning materials of acacia bark extract. The process started with size reduction of acacia bark (16.7 mm x 4.9 mm x 1.8 mm), followed by counter current extraction of acacia bark with water at 80ÂºC with 1:3 bark to water ratio in order to obtain extracts with density of 9-10ÂºBe. Drying was done with a spray dryer. Particle size of the resulting powders was measured with particle size analyzer. Planetary ball mill was used for 6 hours to obtain average particle size of 72.9 nm. A variety of vegetable tanning materials were applied in the vegetable tanning process with varied concentrations of 15, 20, and 25%. The use of 25% nano vegetable tanning material of acacia bark extract gave the best results compared to liquid extract of acacia bark and mimosa. The properties of the leather obtained were tensile strength of 27.04 kg/cm2, elongation at break of 50%, shrinkage temperature of 84oC, and degree of tannage of 79.65%.Keywords: vegetable tanning material, nano particle, acacia bark, extraction, planetary ball mill.ABSTRAKPenelitian ini bertujuan untuk membuat bahan penyamak nano nabati dari ekstrak kulit kayu akasia. Proses pembuatannya dilakukan melalui tahapan pengecilan ukuran kulit kayu akasia (16,7 mm x 4,9 mm x 1,8 mm), dilanjutkan dengan ekstraksi kulit kayu akasia secara counter current menggunakan air 1:3 dengan suhu air awal 80ÂºC sehingga diperoleh ekstrak dengan densitas 9-10ÂºBe. Pengeringan dilakukan dengan spray dryer. Serbuk hasil spray dryer diukur partikelnya dengan particel size analyzer, kemudian diteruskan dengan pengecilan ukuran menggunakan planetary ball mill selama 6 jam sehingga diperoleh partikel berukuran rata-rata 72,9 nm. Berbagai bahan penyamak nabati diaplikasikan dalam proses penyamakan nabati pada kadar 15, 20, dan 25%. Penggunaan ekstrak nano nabati kulit kayu akasia sebesar 25% memberikan hasil terbaik dibanding ekstrak cair kulit kayu akasia maupun mimosa impor. Kulit tersamak yang dihasilkan memiliki kuat tarik sebesar 27,04 kg/cm2, kemuluran sebesar 50%, suhu kerut sebesar 84oC, dan derajat penyamakan sebesar 79,65%.Kata kunci: bahan penyamak nabati, partikel nano, kulit kayu akasia, ekstraksi, planetary ball mill.

Poliester tak jenuh sebagai bahan baku pembuatan helm pengaman Nadilah, Sri; Winursito, Isananto; Wahyuni, Sri; Budiasih, Sri; Purwanti, Christiana Maria Herry
Majalah Kulit, Karet, dan Plastik Vol 19, No 1 (2003): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Unsaturated polyester is applied in many products such as aircraft sections, boats, building, panels, automotive accessories and modifications, etc. In this Â research, unsaturated polyester was used as a raw material, which was reinforced with a fiberglass mat, and casted in a silicon rubber mold. The concentrations of methyl ethyl ketone peroxide (1-3 phr) as an initiator and cobalt naphtanate (0-2 phr) as an accelerator were used in the preparation of safety helmet. Subsequently, the effects of the compounds to the reaction time, the brittleness of the products, an the physical properties, were studied. The results showedÂ that the compound composed by 100 phr unsaturated polyester, 2 phr methyl ethyl ketone peroxide, 2 phr cobalt naphtanate, 40 phr silica, 20 phr fiberglass mat and 1 phr pigment was not brittle, had a good reaction time and nonflammable, gave 4.82 mm in resistance to penetration, and the deflection of A and B were 4.5 and 0.0 mm, respectively. Â Keywords : unsaturated polyester, safety helmet, methyl ethyl ketone peroxide, cobalt-naphtenate.

Penggunaan karet nitril untuk pembuatan kompon oil seal Rochani, Siti; Purwanti, Christiana Maria Herry
Majalah Kulit, Karet, dan Plastik Vol 15, No 2 (1999): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Co-Authors Dwi Ningsih, Dwi Herminiwati Herminiwati, Herminiwati Isananto Winursito, Isananto Prayitno Prayitno Rihastiwi Setiya Murti, Rihastiwi Setiya Siti Rochani, Siti Sri Budiasih, Sri Sri Nadilah, Sri Sri Wahyuni Sri Waskito, Sri Suyatini Suyatini, Suyatini

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