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All Journal Majalah Kulit, Karet, dan Plastik
Christiana Maria Herry Purwanti
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Engineering

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Adsorpsi amonia dari limbah cair industri penyamakan kulit menggunakan abu terbang bagas Rihastiwi Setiya Murti; Christiana Maria Herry Purwanti; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20543/mkkp.v29i2.195

Abstract

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
Poliester tak jenuh sebagai bahan baku pembuatan helm pengaman Sri Nadilah; Isananto Winursito; Sri Wahyuni; Sri Budiasih; Christiana Maria Herry Purwanti
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1838.015 KB) | DOI: 10.20543/mkkp.v19i1.248

Abstract

Unsaturated polyester is applied in many products such as aircraft sections, boats, building, panels, automotive accessories and modifications, etc. In this  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 showed  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.  Keywords : unsaturated polyester, safety helmet, methyl ethyl ketone peroxide, cobalt-naphtenate.
Penggunaan karet nitril untuk pembuatan kompon oil seal Siti Rochani; Christiana Maria Herry Purwanti
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2228.649 KB) | DOI: 10.20543/mkkp.v15i2.264

Abstract

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Co-Authors Isananto Winursito Rihastiwi Setiya Murti Siti Rochani Sri Budiasih Sri Nadilah Sri Wahyuni Suyatini Suyatini