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Metode Elektrokoagulasi Sistem Fe(S)| Cd(II)(aq), NaCl(aq) || H2O(l)|C untuk Pengambilan Kadmium(II)

Nabila Nurdiantika  -  Chemistry Department, Diponegoro University, Indonesia
*Linda Suyati scopus  -  Chemistry Department, Diponegoro University, Indonesia
Gunawan Gunawan orcid scopus  -  Chemistry Department, Diponegoro University, Indonesia
Open Access Copyright 2021 Greensphere: Journal of Environmental Chemistry under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract

Telah dilakukan penelitian mengenai metode elektrokoagulasi sistem Fe | Cd(II), NaCl || H2O | C untuk pengambilan Cd(II).  Besi hidroksi hasil elektrolisis adalah agen koagulasi yang sangat baik.  Tujuan dari penelitian ini menentukan kondisi optimum dalam proses pengambilan Cd(II) membandingkan elektrokoagulasi dengan koagulasi,  mengetahui morfologi permukaan elektroda besi sebelum dan sesudah elektrokoagulasi, serta  menentukan kinetika elektrokoagulasi pengambilan Cd(II). Beberapa kondisi proses elektrokoagulasi yang divariasikan meliputi pengaruh rapat arus, konsentrasi awal Cd(II), pH larutan, dan  waktu proses elektrokoagulasi. Analisis konsentrasi Cd(II) setelah proses elektrokoagulasi menggunakan instrumen Spektrofotometer Serapan Atom (SSA) dan karakterisasi permukaan eletroda besi dengan SEM. Hasil penelitian menunjukkan pengambilan Cd(II) dicapai pada rapat arus 36 µA/cm2, konsentrasi awal  Cd(II) 9 mg/L, pH larutan 7, dan waktu proses elektrokoagulasi selama 120 menit dengan hasil yang dicapai sebesar 99,5%. Pengambilan Cd(II) lebih efektif dengan metode elektrokoagulasi dibandingkan dengan metode koagulasi. Morfologi permukaan besi yang semula tampak halus setelah proses elektrokoagualasi menjadi kasar akibat adanya sebagian besi di permukaan elektroda yang larut dalam produksi besi hidroksida. Kinetika elektrokoagulasi pengambilan Cd(II) mengikuti reaksi pseudo orde dua, dengan k = 17,80 x 10-2 g.mg-1menit-1.

Kata Kunci: Elektrokoagulasi, Pengambilan Cd(II), Fe(OH)3.

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Funding: Diponegoro University

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