Adsorpsi Methyl Violet oleh Karbon Aktif dari Limbah Tempurung Kelapa dengan Aktivator ZnCl2 Menggunakan Pemanasan Gelombang Mikro

Abstract

Synthesis of activated carbon from coconut shell waste with ZnCl2 activation using microwave heating have been carried out. Coconut shell consists of 36.51% lignin, 33.61% cellulose and 19.27% hemicellulose which causes it can be used as a precursor in the synthesis of activated carbon. The activated carbon was further characterized using Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectrophotometer (FTIR) and NOVA Gas Sorption Analyzer-Quantachrome and used for the adsorption of methyl violet in aqueous solution with variation of pH, contact time and concentration of solution. The result showed that the pore of activated carbon was larger than that of the char. The optimum adsorption occurred at pH 3 and the equilibrium time was reached after 180 minutes. The Langmuir equilibrium model was more appropriate than the Freundlich equilibrium model. While the kinetics model analyzed using pseudo first order, pseudo second order, internal diffusion and external diffusion indicated that the pseudo second order was most suitable for the adsorption of methyl violet by coconut shell activated carbon.

Synthesis of Activated Carbon from Petung Bamboo Stems (Dendrocalamus Asper) Using Microwave-Assisted Pyrolysis (MAP) Process for Biogas Storage

“…Figure 8(c) shows that biochar B1120 has an absorption peak at 3330.99 cm -1 indicating the presence of a hydroxyl group (O-H) (Saad et al, 2019). The peak observed around 1591.23 cm -1 may be attributed to the C=C stretching vibration of aromatic compounds (Astuti et al, 2018), while the band at 1030.69 cm -1 reflects C-O group (Saad et al, 2019). After activation with KOH (Figure 8(d)), the absorption peak at 3300-3700 cm -1 indicates the existence of the -OH group is shallower.…”

“…The peak at 1373.22 cm -1 is assigned to the aliphatic deformation of CH2 or CH3 groups or O-H bending of phenolic. The existence of an absorption peak around 1580.14 cm -1 is attributed to the C=C stretching vibrations of aromatic compounds (Astuti et al, 2018), while a peak observed at 1059.18 cm -1 may be attributed to the C-O group (Saafie et al, 2019). After the activation process with KOH (Figure 8(b)), the peak of B960 at 1373.22 cm -1 shifts to 1372.86 cm -1 , indicating aromatization and dehydration occurred as a result of the decomposition and condensation of volatile matters (Saad et al, 2019).…”

“…Meanwhile, the C=C group indicated by an absorption peak at 1591.23 cm -1 shifts to 1564.89 cm -1 and deepens. It may be due to the decomposition of the C-H bond to produce aromatic C=C bonds which is more stable at high temperatures (Saad et al, 2019) and create new pores (Astuti et al, 2018).…”

“…Ogungbenro et al, (2020) used palm plants as raw materials with H2SO4 activation to produce AC having a surface area of 577.34 m 2 /g. Coconut shells AC produced through ZnCl2 activation had a surface area of 15 m 2 /g (Astuti et al, 2018). Activated carbon derived from ratan plant stalks using NaOH activation had a surface area of 1135 m 2 / g (Islam et al, 2017), while the use of KOH as an activating agent can produce microporous activated carbon with a high surface area, up to 2000 m 2/ g (Elmouwahidi et al, 2012;Astuti et al, 2019).…”

Impregnasi ZnO Karbon Aktif dari Sabut Kelapa (Cocos nucifera L) Fotokatalis Untuk Degradasi Rhodamin B

“…Atom C memiliki struktur pori internal, sehingga dapat berfungsi sebagai adsorben [4]. Karbon aktif yang digunakan dalam penelitian ini menggunakan karbon aktif yang telah dibuat oleh penelitian sebelum, dengan bahan dasar dari sabut kelapa dimana hasil yang didapatkan masih rendah yaitu 2,9228 mg/g [5]. Oleh karena itu, untuk meningkatkan daya serapnya maka karbon aktif dapat diemban dengan katalis semikonduktor.…”