Chemistry Department, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Indonesia
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@article{JKSA18881, author = {Nuryono Nuryono and Eko Kunarti and Narsito Narsito}, title = {Pengaruh Pemanasan Terhadap Kemampuan Tanah Diatomit sebagai Adsorben Logam Krom (III) dan Kadmium (II)}, journal = {Jurnal Kimia Sains dan Aplikasi}, volume = {3}, number = {2}, year = {2000}, keywords = {Tanah diatomit; adsorben; Krom (III); Kadmiun (II); adsorpsi}, abstract = {Telah dilakukan penelitian untuk mengkaji pengaruh pemanasan terhadap kemampuan tanah diatomit Sangiran, Sragen, Jawa Tengah terhadap kemampuannya mengadsorbsi logam Cr(III) dan Cd(II) dalam larutan. Sebelum proses adsorpsi dilakukan tanah diatomit dikarakterisasi keberadaan situs aktifnya dengan menggunakan spektrofotometri infra merah (IR) dan analisis termogravimetri (TGA). Adsorpsi dilakukan melalui sistem bath dengan mencampurkan sejumlah sampel tanah dengan larutan logam pada temperatur kamar, 30°C, pH 4,0- 6,0 (tanpa pengaturan) untuk Cr(lll), dan 5.0 - 7,0 untuk Cd(II). Proses serupa dilakukan terhadap tanah diatomit yang telah dipanaskan pada temperatur yang berbeda (300°C, 500°C dan 900°C). Pengaruh lama kontak dan konsentrasi awal logam terhadap adsorpsi dievaluasi untuk menentukan kapasitas, tetapan adsorpsi, dan energi adorpsi. Hasil penelitian menunjukkan bahwa tanah diatomit melepaskan semua molekul air pada pemanasan 580°C, dan kondensasi gugus silanol menjadi siloksan terjadi pada pemanasan 700°C. Pemanasan tanah diatomit sampai 500°C dapat meningkatkan kemampuan mengadsorpsi ion Cr(III), sedangkan untuk adsorpsi ion Cd(ll) tidak berubah secara signifikan. Sebaliknya, pemanasan sampai 900°C mengakibatkan penurunan yang tajam terhadap kemampuannya mengadsorpsi baik ion Cr(III) maupun Cd(II). Kapasitas adsorpsi tertinggi untuk Cr(III), 205,3 mg/g, terjadi pada tanah setelah pemanasan 500°C, sedangkan untuk Cd(II), 14.93 mg/g, terjadi pada tanah setelah pemanasan 300°C. Tetapan adsorpsi berkisar 6.93 - 11,51 x 10 3 untuk Cd(II) dan 0,94- 1,58 x 10 3 untuk Cr(III), sedangkan energi adsorpsi berkisar 17,30- 18,55 kJ/mol untuk Cr(III) dan 21,49- 23,56 kJ/mol untuk Cd(ll).}, issn = {2597-9914}, pages = {41--51} doi = {10.14710/jksa.3.2.41-51}, url = {https://ejournal.undip.ac.id/index.php/ksa/article/view/18881} }
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