<![CDATA[Research on the utilization of tannins and catechins of gambier has been done a lot. There is no research report however that examines the utilization of gambier processing solid waste. The objective of the research was to utilize the solid waste of gambier processing as a raw material of printer toner. The research was done through pyrolysis process of solid waste with temperature variation 400, 500, 600oC and time variation 30, 60 minutes. The highest carbon content was obtained 42% with 400oC temperature and 60 minutes. The pyrolysis process of the gambier solid waste was further carried out at the optimum temperature and time. The charcoal was activated with H3PO4 at concentrations 0; 5; and 10% for 24 hours, cooled and washed to remove residual of H3PO4, then drying in the oven at temperature 115oC for 24 hours. Size reduction process used a ball milling for 2 hours with speed 500 rpm. Fixed carbon content was obtained between 43-51%. The results of morphological testing by scanning electron microscope showed that the produced carbon powder had not a uniform size yet. The average particle size was between 5-10 µm with polydispersity index 0.9. The most mineral elements of carbon powder analysis using XRF were Ca, Mg, K, Si, Fe, and P. Testing of print quality based on ISO/IEC 19752:2004 using laser jet printers had not provided optimal results yet.ABSTRAKPenelitian pemanfaatan tanin dan katekin gambir telah banyak dilakukan. Namun, belum dilaporkan penelitian yang mengkaji pemanfaatan limbah padat pengolahan gambir. Tujuan penelitian adalah memanfaatkan limbah padat pengolahan gambir sebagai bahan baku pembuatan tinta serbuk printer. Penelitian dilakukan melalui proses pirolisis limbah padat dengan variasi suhu 400, 500, 600oC dan variasi waktu 30, 60 menit. Kadar karbon terikat tertinggi diperoleh sebesar 42% dengan suhu pirolisis 400oC selama 60 menit. Proses pirolisis limbah padat gambir selanjutnya dilakukan pada suhu dan waktu optimal tersebut. Arang aktif dilakukan aktifasi menggunakan aktifator H3PO4 pada konsentrasi 0, 5 dan 10% selama 24 jam, kemudian didinginkan dan dicuci untuk menghilangkan sisa H3PO4, dan selanjutnya dikeringkan dalam oven pada suhu 115 oC selama 24 jam. Proses penghalusan menggunakan ball milling selama 2 jam dengan kecepatan 500 rpm. Hasil pengujian kadar karbon terikat berkisar antara 43-51%. Hasil pengujian morfologi dengan alat Scanning Electron Microscope) memperlihatkan serbuk karbon yang dihasilkan belum mempunyai ukuran seragam. Ukuran partikel serbuk rata-rata 5-10 µm dengan indek polidispersitas sebesar 0,9. Kandungan unsur mineral yang terbanyak dari hasil analisis serbuk karbon adalah unsur Ca, Mg, K, Si, Fe, dan P. Uji coba kualitas cetak berdasarkan ISO/IEC 19752:2004 menggunakan printer laser belum memberikan hasil yang optimal.]]>
