Kenfariatha, Moza Legitara (2026) Pengaruh Jenis Elektrolit Dan Ph Terhadap Degradasi Senyawa Organoklorin Pada Proses Oksidasi Elektrokimia Menggunakan Anoda Boron-Doped Diamond (BDD). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Senyawa organoklorin merupakan senyawa yang banyak dihasilkan oleh limbah industri dan bersifat persisten yang sulit terdegradasi melalui metode konvensional akibat struktur molekulnya yang stabil dan ikatan C-Cl yang kuat. Teknologi Electrochemical Advanced Oxidation Processes (EAOPs) dengan anoda Boron-Doped Diamond (BDD) merupakan solusi potensial karena kemampuannya menghasilkan radikal hidroksil (•OH) dalam jumlah besar untuk mendegradasi senyawa yang recalcitrant. Penelitian ini bertujuan menganalisis pengaruh jenis elektrolit (NaCl dan Na₂SO₄) serta pH terhadap degradasi senyawa organoklorin, dan mengidentifikasi reaksi yang terjadi di permukaan elektroda melalui metode Cyclic Voltammatry. Penelitian dilakukan dalam skala laboratorium menggunakan reaktor satu kompartemen dengan sistem batch. Limbah sintesis yang mengandung 4-klorofenol sebesar 100 mg/L diolah dengan elektroda BDD sebagai anoda dan titanium sebagai katoda. Variasi yang diterapkan yaitu pH 3, pH 7, dan pH 9 serta penambahan elektrolit NaCl 0,5 M dan Na₂SO₄ 0,5 M. Parameter yang diukur mencakup Chemical Oxygen Demand (COD), Total Organic Carbon (TOC), dan konsentrasi klorofenol. Analisis Cyclic Voltammetry dilakukan menggunakan potensiostat untuk mengidentifikasi mekanisme reaksi elektrokimia. Konsentrasi klorofenol, COD, dan TOC memiliki nilai degradasi secara berturut-turut sebesar 7,72% - 85,7%, 27% - 93%, dan 23,46% - 87%. Hal ini dikarenakan waktu hidup yang lebih panjang dibanding spesies chlorine, memungkinkan mineralisasi berkelanjutan dalam periode operasi yang lebih lama. Sedangkan untuk NaCl memiliki reaktivitas sangat tinggi dan waktu hidup pendek, sehingga menyebabkan degradasi 4-klorofenol yang sangat cepat pada fase awal operasi. Adapun untuk kondisi pH yang paling optimal adalah pada pH 7 atau netral. 3. Hasil analisis dari Cyclic Voltammatry ialah pada BDD dimana mengalami proses elektrokimia yang irreversible karena dapat dilihat dari tidak adanya tergangueduksi balik yang disebabkan oleh radikal fenolik yang terbentuk langsung bereaksi lebih lanjut membentuk intermediat. terdapat puncak oksidasi pada potential +0.5 hingga +0.7 V, 4-klorofenol dapat dioksidasi secara langsung tanpa tergangu oleh reaksi water oxidation.
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Organochlorine compounds are widely produced by industrial waste and are persistent substances that are difficult to degrade using conventional methods due to their stable molecular structure and strong C–Cl bonds. Electrochemical Advanced Oxidation Processes (EAOPs) technology using a Boron-Doped Diamond (BDD) anode offers a potential solution due to its ability to generate large quantities of hydroxyl radicals (•OH) to degrade these recalcitrant compounds. This study aims to analyse the influence of electrolyte type (NaCl and Na₂SO₄) and pH on the degradation of organochlorine compounds, and to identify the reactions occurring at the electrode surface using cyclic voltammetry. The study was conducted on a laboratory scale using a single-compartment reactor with a batch system. Synthetic waste containing 50 mg/L of 4-chlorophenol was treated using a BDD electrode as the anode and a titanium electrode as the cathode. The variables tested were pH 3, pH 7 and pH 9, as well as the addition of 0.5 M NaCl and 0.5 M Na₂SO₄ electrolytes. The parameters measured included Chemical Oxygen Demand (COD), Total Organic Carbon (TOC), and chlorophenol concentration. Cyclic voltammetry analysis was performed using a potentiostat to identify the electrochemical reaction mechanism. The degradation rates for chlorophenol, COD, and TOC were 7.72%–85.7%, 27%–93%, and 23.46%–87%, respectively. This is due to a longer half-life compared to chlorine species, allowing for sustained mineralization over a longer operational period. Meanwhile, NaCl has very high reactivity and a short half-life, resulting in very rapid degradation of 4-chlorophenol during the initial phase of operation. The most optimal pH condition is at pH 7, or neutral. 3. The results of the cyclic voltammetry analysis indicate that an irreversible electrochemical process occurs at the BDD, as evidenced by the absence of back-reduction; this is because the phenolic radicals formed react immediately to form intermediates. An oxidation peak is observed at a potential of +0.5 to +0.7 V, and 4-chlorophenol can be oxidized directly without being interfered with by water oxidation reactions.
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