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All Journal ALCHEMY Jurnal Penelitian Kimia Integrated Lab Journal
Maya Rahmayanti
UIN Sunan Kalijaga Yogyakarta
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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ISOLASI ASAM HUMAT DARI TANAH GAMBUT SUMATERA DAN KALIMANTAN DAN ANALISIS KANDUNGAN GUGUS FUNGSIONALNYA Maya Rahmayanti; Erni Yunita; Masyithah Nisvi Prandini
Integrated Lab Journal Vol. 7 No. 2 (2019): Integrated Lab Journal
Publisher : UIN Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (806.205 KB) | DOI: 10.14421/ilj.2019.20197207

Abstract

Humic acid have done isolated from Peat soil of Sumatra and Kalimantan. The purpose of this research were to study the structure of hipotetik humic acid isolated from Sumatra and Kalimantan via FTIR spectrophotometry and analysis of functional groups through indirect titrationpotentiometric method. The FTIR spectra showed that the Sumatera and Kalimantan humic acid had the –COOH, -OH dan –NH groups. The results of titration showed that the value of the total acidity of humic acid isolated from Sumatra and Kalimantan were 710 and 570 cmol kg-1, respectively. The content of carboxyl functional groups were 260 and 300 cmol kg-1, respectively, and the contents of the phenolic hydroxyl group were 450 and275 cmol kg-1, respectively. The content of humic acid functional groups were included in the total acidity range structure of humic acid hypothetical according to Stevenson.
Recovery Emas dalam Sistem Au tunggal dan Sistem Multilogam (Au/Cu) Menggunakan Adsorben Asam Askorbat Termodifikasi Magnetit Maya Rahmayanti
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 2 (2020): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.16.2.36129.179-189

Abstract

Limbah elektronik mengandung banyak logam yang bernilai guna antara lain tembaga (Cu), besi (Fe), timah (Sn), timbal (Pb), seng (Zn), emas (Au) dan perak (Ag). Di antara logam tersebut, logam yang memiliki nilai ekonomi tertinggi dan banyak disimpan sebagai investasi kekayaan dalam jangka panjang adalah emas (Au), namun jumlah kandungan emas dalam elektronik lebih kecil dibandingkan logam yang lain. Penelitian ini merupakan studi pendahuluan recovery emas dari limbah elektronik. Studi diawali dengan mempreparasi asam askorbat termodifikasi magnetit (Fe3O4/AA) dan digunakan sebagai adsorben Au dalam sampel simulasi. Sampel simulasi terdiri dari sistem Au tunggal (larutan HAuCl4-) dan sistem multilogam (Au/Cu). Pengaruh pH larutan HAuCl4- terhadap kemampuan adsorpsi [AuCl4]-, kinetika dan isoterm adsorpsidipelajari pada sistem Au tunggal. Sementara itu, pengaruh keberadaan ion logam Cu terhadap kemampuan Fe3O4/AA untuk recovery emas dipelajari dalam sistem multilogam (Au/Cu). Metode yang digunakan dalam penelitian ini adalah metode batch. Hasil penelitian menunjukkan bahwa adsorpsi [AuCl4]- pada Fe3O4/AA optimum pada pH 4 dan kesetimbangan adsorpsi tercapai pada jam ke-30. Model kinetika adsorpsi mengikuti model kinetika pseudo orde dua Ho dan model isoterm adsorpsi mengikuti model isoterm Langmuir dengan kapasitas adsorpsi sebesar 0,09900 mol/g. Keberadaan ion logam Cu berpengaruh terhadap kemampuan Fe3O4/AA dalam mengadsorpsi [AuCl4]- dalam sistem multilogam (Au/Cu). Gold Recovery in a Single Au and Multi-metal (Au/Cu) Systems Using Ascorbic Acid-Modified Magnetite Adsorbent. Electronic waste contains many valuable metals, including copper (Cu), iron (Fe), lead (Sn), lead (Pb), zinc (Zn), gold (Au), and silver (Ag). Among these metals, the metal that has the highest economic value and can be stored for a long-term wealth investment is gold (Au), but the amount of gold content in electronic devices is smaller than other metals. This research was a preliminary study of gold recovery from electronic waste. The study began by preparing magnetite-modified ascorbic acid (Fe3O4/AA) and was used as an adsorbent agent of gold in a simulated sample. The simulation sample consisted of a single Au system (HAuCl4- solution) and a multi-metal system (Au/Cu). The effect of pH of the HAuCl4- solution on the ability of [AuCl4]- adsorption, kinetic and isotherm adsorptions were studied in a single Au system. Meanwhile, the effect of the Cu metal ions content on Fe3O4/AA capacity for gold recovery was studied in a multi-metal system. The method used in this research was the batch method. The results showed that optimum adsorption of [AuCl4]- onto Fe3O4/AA at pH 4 and adsorption equilibrium was reached at 30 hours. The adsorption kinetics model followed the second-order pseudo-Ho kinetics model, and the adsorption isotherm model followed the Langmuir isotherm model with an adsorption capacity of 0.09900 mol/g. The presence of Cu metal ions affected the capacity of Fe3O4/AA in the [AuCl4]-adsorption in a multi-metal system (Au/Cu).
Co-Authors Erni Yunita Masyithah Nisvi Prandini