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Sintesis Karbon Aktif Limbah Lumpur Aktif Industri Gula sebagai Adsorben Limbah Logam Berat Cu(II)

*Adhi Setiawan scopus  -  Politeknik Perkapalan Negeri Surabaya, Indonesia
Muhammad Iqbal Ali Bawafi  -  Program Studi Teknik Pengolahan Limbah, Politeknik Perkapalan Negeri Surabaya (PPNS), Indonesia
Tarikh Azis Ramadani  -  Program Studi Teknik Pengolahan Limbah, Politeknik Perkapalan Negeri Surabaya (PPNS), Indonesia
Indri Santiasih  -  Program Studi Magister Terapan Teknik Keselamatan dan Resiko, Politeknik Perkapalan Negeri Surabaya (PPNS), Indonesia
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Abstract

Penelitian ini bertujuan melakukan sintesis karbon aktif dari limbah lumpur aktif unit Sludge Drying Bed (SDB) industri gula sebagai adsorben dan efektifitasnya dalam menurunkan kandungan logam berat Cu(II). Proses karbonasi lumpur aktif dilakukan pada suhu 600oC dilanjutkan dengan aktifasi menggunakan asam sulfat 20%. Hasil penelitian menunjukkan bahwa karbon aktif memiliki kadar air, kadar zat yang menguap, dan daya serap I2 telah memenuhi SNI. Hasil SEM menunjukkan bahwa morfologi partikel berbentuk granular dengan ukuran rata-rata partikel sebesar 134,3 μm. Luas permukaan spesifik partikel karbon aktif sebesar 1013,63 m2/g. Pengujian karbon aktif untuk adsorpsi logam Cu(II) menunjukkan bahwa peningkatan waktu kontak adsorpsi akan meningkatkan efisiensi penyisihan Cu(II). Peningkatan konsentrasi awal Cu(II) menyebabkan kecenderungan penurunan efisiensi penyisihan Cu(II). Efisiensi penyisihan maksimum Cu(II) diperoleh pada kondisi waktu kontak 40 menit dan konsentrasi awal Cu(II) 12,5 mg/L dengan nilai sebesar 86,32%. Isoterm Adsorpsi karbon aktif mengikuti persamaan Freunlich. Kinetika adsorpsi karbon aktif pada konsentrasi awal Cu(II) sebesar 6,125 dan 12,5 mg/L mengikuti pseudo orde dua sedangkan pada konsentrasi awal Cu(II) sebesar 25 dan 50 mg/L mengikuti pseudo orde satu.

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Keywords: adsorpsi; isoterm adsorpsi; karbon aktif limbah lumpur; kinetika adsorpsi

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