Charlena

IPB University

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Irma Herawati Suparto

IPB University

Sri Sugiarti

IPB University

Zainal Alim Mas’ud

IPB University

Henny Purwaningsih

IPB University

Ahmad Sjahriza

IPB University

J. Sri Adiningsih

Badan Penelitian dan Pengembangan Kesehatan

Sulistioso Giat Sukaryo

National Nuclear Energy Agency of Indonesia

Fajar Kurniawan

Muhammad Dicky Iswara

IPB University

S. Sri Dwiningsih

Cooperative Institutions

IPB University

National Research and Innovation Agency

Badan Pengkajian dan Penerapan Teknologi

Indonesian Institute of Sciences

University of Indonesia

National Nuclear Energy Agency of Indonesia

Bandung Institute of Technology

Sepuluh Nopember Institute of Technology

Information and Communication Technology Agency

Sriwijaya University

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Modifikasi zeolit melalui interaksi dengan Fe(OH)3 untuk meningkatkan kapasitas tukar anion

F. Syafi'i Sri Sugiarti Charlena

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Profil kelarutan limbah minyak bumi dalam air akibat pengaruh surfaktan nonionik dan laju pengadukan

Charlena Zainal Alim Mas’ud Ahmad Syahreza

Petroleum waste is classified as a dangerous waste that cause pollution and damage the environtment. The remediation of petroleum polluted soil could be done by microorganism capability. Additional of nonionic surfactant and stirring rate would make soil dispersed well in water, facilitating good contact between microorganism and petroleum carbon as its feed. In this research, Tween 80 and Brij 35 were used as surfactants. The observed parameters were concentrations and stirring rates. Surfactant concentration was selected based on surface tension value and emulsion stability. The highest emulsion stability for Tween 80 observed was 0.24% at concentration 0.0175%, while for Brij 35 equal to 0.22% at concentration 0.0150%. Stirring rates were applied 100, 120, and 140 rpm, successively based on liquid Total Petroleum Hydrocarbon (TPH) value. Liquid TPH value at 100, 120, and 140 rpm for Tween 80 and Brij 35 were 0.25, 0.32, 0.40 and 0.36, 0.55, 0.74%, successively. Liquid TPH depicted amount of oil that was dispersed into the water. The other parameters such as solid TPH and Chemical Oxygen Demand (COD) obtained for 140 rpm were 15.56% and 41235 mg/L for Tween 80 while for Brij 35 equal to 16.55% and 41717 mg/L.

Total petroleum hydrocarbon

Kerosene

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SINTESIS HIDROKSIAPATIT DARI CANGKANG KEONG SAWAH(Bellamya javanica) DENGAN METODE SIMULTAN PRESIPITASI PENGADUKAN BERGANDA

SEMIRATA 2015 (2016)

Bambang Sugeng Lestari Puji Astuti Charlena

Hidroksiapatit (HAp) disintesis menggunakan bahan dasar cangkang keong sawah sebagai sumber kalsium (Ca(OH) 2 ) dan (NH 4 ) 2 HPO 4 sebagai sumber fosfat. Sintesis dilakukan dengan metode presipitasi pengadukan berganda dengan ragam waktu sonikasi 4 dan 6 jam serta ragam suhu 600, 800, 1000, dan 1100 oC. Hasil sintesis dicirikan menggunakan difraksi sinar-X (XRD), mikroskop elektron payaran (SEM), dan penganalisis ukuran partikel (PSA). Hasil analisis difraksi sinar-X menunjukkan bahwa HAp yang terbentuk belum murni, karena terdapat fase lain seperti CaCO 3 , Ca(OH) 2 , dan CaO. Analisis morfologi menggunakan SEM menunjukkan bentuk partikel berupa granular-granular dengan permukaan kasar dan tidak seragam. Ukuran rerata partikel hasil PSA sampel A4 adalah 254.60 nm sedangkan ukuran sampel B4 adalah 226.46 nm. Semakin lama waktu sonikasi ukuran partikel semakin kecil. Kata kunci: Cangkang keong sawah, hidroksiapatit, metode presipitasi, pengadukan berganda

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Bioremediasi Tanah Tercemar Limbah Minyak Berat Menggunakan Konsorsium Bakteri

Charlena

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Synthesis of Hydroxyapatite from Rice Fields Snail Shell (Bellamya javanica) through Wet Method and Pore Modification Using Chitosan

Procedia Chemistry (2015)

Charlena Irma Herawati Suparto Desi Kusuma Putri

Hydroxyapatite (HAp) was synthesized using calcium originated from rice fields snail shell, that was reacted with phosphate obtained from diammonium hydrogen phosphate. The resulted pore was modified using chitosan. The HAp was prepared using wet method. Chitosan was used as porogen due to its bioactivity and biocompatibility properties. Sonication time in the synthesis was varied in 2, 4, and 6hours. The longer the synthesis time, the higher the purity of the HAp. Pore modification was applied to HAp with the highest purity. Pore modifications were conducted by adding 4% and 6% chitosan. Scanning electron microscope identification showed no significant difference in pore sizes using 4% and 6% chitosan. Fourier transform infrared spectrum of HAp with 6% chitosan showed almost similar functional groups with that of the unporogened HAp. In vitro test of the porogened HAp revealed its bioactivity.

Biocompatibility

Sonication

10.1016/j.proche.2015.12.120

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Hidroxyapatite Coating on CoCrMo Alloy Titanium Nitride Coated Using Biomimetic Method

Journal of Physics Conference Series (2016)

Charlena Sulistioso Giat Sukaryo Muhammad Fajar

Bone implants is a way to cure broken bones which is being developed. The implants can be made of metals, ceramics and polymers. Metallic materials commonly used are titanium (Ti), stainless steel, and metal alloys. This study used Co-based alloys, i.e. CoCrMo coated with titanium nitride (TiN) which was then coated on hidroxyapatite (HAp). The HAp coating on the surface of CoCrMo alloy was done by biomimetic methods, first by soaking the metal alloys in simulated body fluid (SBF) solution for 18, 24, and 36 hours. The immersion in the SBF solution produced white coat on the surface of the metal alloy. The layers formed were analyzed by scanning electron microscope (SEM) and characterized by x-ray diffractometer (XRD). Based on the SEM results of 36 hours treatment, the morphology of apatite crystal formed fine grains. According to XRD result, there were HAp peaks at angles 2θ 31.86, 32.25, dan 39.48. However, there were also CaCO3 peaks at angles 2θ 29.46, 36.04, and 46.79. It indicated the pure HAp is not yet formed.

Diffractometer

Simulated body fluid

Titanium alloy

10.1088/1742-6596/776/1/012056

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Fosfatisasi kalsium karbonat cangkang telur ayam dan kajiannya pada proses adsorpsi logam timbal

Charlena Henny Purwaningsih Rahmat Hafid

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Pengaruh Penambahan Kapur terhadap Pelepasan Gas NH3 pada Manur Ayam Petelur