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All Journal CHEMPUBLISH JOURNAL Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Ngatijo
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Sintesis dan karakterisasi fotokatalis ZnO/karbon aktif dan aplikasinya pada degradasi rhodamin B Restina Bemis; Nelson; Ngatijo; Siti Nurjanah; Nur'aini Maghviroh
CHEMPUBLISH JOURNAL Vol. 4 No. 2 (2019): Chempublish Journal
Publisher : Universitas Jambi, Fakultas Sains dan Teknologi, Program Studi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/chp.v4i2.7936

Abstract

Telah dilakukan sintesis dan karakterisasi ZnO/karbon aktif sebagai fotokatalis untuk mendegradasi rhodamin B. Fotokatalis ZnO/karbon aktif disintesis menggunakan motode solid state menggunakan prekursor Zn(NO3)2.4H2O dan karbon aktif dari tempurung kelapa. Pola difraksi XRD menunjukkan bahwa fotokatalis ZnO/karbon aktif memiliki struktur heksagonal wurzite yang sesuai dengan standar COD- Inorg No. 96-900-4180 dengan kristal berukuran 0,12 µm. Hasil UV-Vis menunjukkan ZnO memiliki nilai energi celah pita (band gap energy, Eg) sebesar 3,12 eV dan hasil SEM menunjukkan morfologi permukaan berbentuk tidak beraturan dan mangalami mengalami aglomerasi. Analisis EDS pada ZnO dan ZnO/karbon aktif memberikan persentase massa elemen Zn= 59,4%; O= 38,6% dan Zn= 66,9%; O=23,6%; C=7,8%. Hasil uji aktivitas fotokatalitik menunjukkan bahwa kondisi optimum degradasi rhodamin B 10 ppm memerlukan 200 mg fotokatalis ZnO/karbon aktif dan waktu radiasi sinar UV selama 90 menit. Fotokatalis ZnO/karbon aktif efektif dalam mendegradasi zat warna rhodamin B pada kondisi optimumnya dengan persentase degradasi sebesar 86,84%. Dari data analisis LC-MS menunjukkan terjadi degradasi molekul rhodamin B (m/z= 442,88) membentuk senyawa intermediet dengan perbandingan rasio massa dan muatan sebesar 387,30; 359,01; 331,12; 132,79 dan 117,03 m/z.
Sintesis dan karakterisasi magnetit terlapis dimerkaptosilika Abdurrazaq Habib; Ngatijo; Diah Riski Gusti
CHEMPUBLISH JOURNAL Vol. 4 No. 2 (2019): Chempublish Journal
Publisher : Universitas Jambi, Fakultas Sains dan Teknologi, Program Studi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/chp.v4i2.8034

Abstract

Synthesis of dimerkaptosilica coated magnetite was carried out in several stages, namely synthesis of magnetite from FeCl3.6H2O and FeSO4.7H2O by coprecipitation method. Extraction of sodium silicate from rice husk ash as a source of silica. Coating magnetite by dimerkaptosilica using 2,3-dimercapto-1-propanol as a source of mercapto groups and sodium silicate as sources of silica. Coating is done by the sol-gel method. FTIR characterization showed the appearance of uptake at wave numbers 894,04 cm-1, 2951,22 cm-1 and 3655,26 cm-1 from several absorbances which also appeared in magnetite material spectra indicating ―SH, ―CH2 and ―OH groups. XRD characterization was characterized by the appearance of a peak at 2θ, which was 35,43° and SEM characterization showed that the material Fe3O4―DMS had a morphological shape in the form of round clumps forming gray-colored aggregates.
Magnetically Separable Humic Acid-Chitin Based Adsorbent as Pb(II) Uptake in Synthetic Wastewater Ngatijo; Marlinda, Lenny; Malikhah, Wukhoidatul; Ishartono, Bayu; Basuki, Rahmat
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.22

Abstract

Modification of humic acid (HA) from the peat soil of Jambi province, Indonesia with chitin and magnetite to form Fe3O4/HA-chitin has been successfully carried out. The successful synthesis was identified from characterization with functional group analysis, crystal analysis, magnetic strength measurement, and morphological and elemental analysis. The application of Fe3O4/HA-chitin to adsorb Pb(II) ion was analyzed using the Lagergren, Ho, Santosa, and RBS kinetics models (kinetics study) and the Langmuir, Freundlich, Dubinin-Radushkevich (DR), and Temkin isotherm model (isotherm study). The kinetics study followed the Ho model (pseudo-second order) with R2 and kHo of 0.9997 and 10264.59 g/mol min, respectively. The results of the data applicable to the Freundlich model showed that several sites were capable of multilayer adsorption (B) with a large enough adsorption capacity of 929.19 mg/g (about 28 times higher than the monolayer adsorption of Langmuir data). However, the outermost layer had a feeble adsorption energy of 0.51 kJ/mol, as measured by Temkin's adsorption energy. In the layer between the first layer (Langmuir) and the outermost layer (Freundlich), the DR isotherm was measured at a capacity of 104.87 mg/g (qD, the 3rd layer of the first layer) the adsorption energy was measured at 12.91 kJ/mol. A cross-study on the prediction of adsorption energy using the Santosa and RBS kinetics models showed that the RBS model had an adsorption energy value (26.45 kJ/mol) that was closer to the adsorption energy value of the Langmuir isotherm (27.55 kJ/mol).
Co-Authors Abdurrazaq Habib Bayu Ishartono Diah Riski Gusti Lenny Marlinda Malikhah, Wukhoidatul Nelson Nur'aini Maghviroh Rahmat Basuki Restina Bemis SITI NURJANAH