Sonochemical Co-Precipitation Synthesis of Gallic Acid-Modified Magnetite

Rahmayanti, Maya; Santosa, Sri Juari; Sutarno, .

doi:10.4028/www.scientific.net/amr.1101.286

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…The intense peak at 1620 and 1612 cm -1 is due to C=C stretching vibration of the aromatic ring whereas a band around 1350 cm -1 is corresponded to -CH-bending vibration of benzene ring. A band at 1026 cm -1 is due to the C-O stretching and a band at around 1310 cm -1 is attributed to O-H bending vibration of phenolic group of SA and GA [13].…”

Section: Resultsmentioning

confidence: 99%

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Comparative Study on the Adsorption of [AuCl4]– onto Salicylic Acid and Gallic Acid Modified Magnetite Particles

2018

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Section: Resultsmentioning

confidence: 99%

“…When the pH of the system was low (2-3), -OH group is unionized, while the charge of [AuCl4] -was negative. Therefore, it was possible to form hydrogen bonding between the surface of Mag-SA and Mag-GA and [AuCl4] - [20]. The optimum adsorption occurred at pH 3 for Mag-SA and Mag-GA.…”

Section: Stability Of Magnetites In Mag-sa and Mag-gamentioning

confidence: 99%

Comparative Study on the Adsorption of [AuCl4]– onto Salicylic Acid and Gallic Acid Modified Magnetite Particles

2018

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“…The synthesis of magnetite modified gallic acid was carried out by sonochemical method in one and two stages of reaction. This method refers to the research of Rahmayanti et al (2015) without modification.…”

Section: Magnetite Modified Gallic Acid Synthesis (Ga-fe3o4-sk)mentioning

confidence: 99%

The Effectiveness of Magnetite Modified Gallic Acid Synthesized by Sonochemical Method As AuCl4- Adsorbent-Reductor

Rahmayanti

Santosa

Sutarno

et al. 2021

Indo. J. Chem. Res.

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In recent years gallic acid has been developed as an AuCl4- adsorbent-reducing agent. In this research, gallic acid was modified with magnetite by sonochemical method (GA-Fe3O4), and its effectiveness as an AuCl4- adsorbent was studied. GA-Fe3O4 was synthesized through one-stage (GA-Fe3O4-SK1) and two-stage (GA-Fe3O4-SK2) methods. The effectiveness of GA-Fe3O4 was studied through optimization studies on pH, time, kinetics, and isotherm adsorption of AuCl4-. The adsorption method used was the batch method in the pH range 2-7. While the kinetics model used was the Lagergren and Ho kinetics model. The adsorption isotherm model used was the Freundlich and Langmuir isotherm model. The results showed that the optimum pH conditions for adsorption of AuCl4- on GA-Fe3O4 occurred at pH 3. Adsorption of AuCl4- on GA-Fe3O4-SK1 and GA-Fe3O4-SK2 both followed the Ho kinetic model, while the adsorption isotherm followed the Freundlich isotherm model with values KF were 0.041 and 0.034 mol/g respectively.

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“…Perbandingan mol Fe3O4 dan AA yang digunakan pada penelitian ini adalah 1 : 3. Metode ini mengacu pada penelitian Rahmayanti et al (2015) yang memodifikasi asam galat dengan magnetit dengan hasil kristalinitas produk terbaik diperoleh melalui metode dua tahap.…”

Section: Asam Askorbat Termodifikasi Fe3o4 (Fe3o4-aa)unclassified

Recovery Emas dalam Sistem Au tunggal dan Sistem Multilogam (Au/Cu) Menggunakan Adsorben Asam Askorbat Termodifikasi Magnetit

Rahmayanti

2020

ALCHEMY J.Pen.Kim

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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).

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Sonochemical Co-Precipitation Synthesis of Gallic Acid-Modified Magnetite

Cited by 9 publications

References 8 publications

Comparative Study on the Adsorption of [AuCl<sub>4</sub>]<sup>–</sup> onto Salicylic Acid and Gallic Acid Modified Magnetite Particles

Comparative Study on the Adsorption of [AuCl<sub>4</sub>]<sup>–</sup> onto Salicylic Acid and Gallic Acid Modified Magnetite Particles

The Effectiveness of Magnetite Modified Gallic Acid Synthesized by Sonochemical Method As AuCl4- Adsorbent-Reductor

Recovery Emas dalam Sistem Au tunggal dan Sistem Multilogam (Au/Cu) Menggunakan Adsorben Asam Askorbat Termodifikasi Magnetit

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