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All Journal JURNAL KIMIA SAINS DAN APLIKASI KOVALEN: Jurnal Riset Kimia Jurnal Sains dan Teknologi Pangan Jurnal Progres Kimia Sains Chemistry Indonesian Journal of Chemical Research Jurnal Ilmu Kefarmasian Indonesia Sarwahita : Jurnal Pengabdian Kepada Masyarakat Cokroaminoto Journal of Chemical Science Jurnal Mandala Pengabdian Masyarakat Jurnal Akademika Kimia Amal Ilmiah: Jurnal Pengabdian Kepada Masyarakat Jurnal Akademika Kimia Jurnal Analis Kesehatan Kendari
THAMRIN AZIS
UNIVERSITAS HALU OLEO
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Other

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Performance of The Composite Electrode of Reduced Graphene Oxide Palm Oil Shell - Zinc Oxide (rGOCKS - ZnO) as a Chemical Oxygen Demand (COD) Sensor by Photoelectrocatalysis Azis, Thamrin; Muzakkari, Muhammad Z.; Nurdin, Muh.; Maulidiyah, Maulidiyah; Muslia, Wa O.; Bijang, Catherina M.; Tahril, Tahril
Jurnal Akademika Kimia Vol. 12 No. 2 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i2.pp123-131

Abstract

The preparation of reduced graphene oxide composite electrodes from palm shells (rGOCKS-ZnO) as a chemical oxygen demand (COD) sensor by photoelectrocatalysis has been successfully carried out. The preparation of rGOPS - ZnO electrodes by thermal reduction method and modified Hummer. The XRD results showed several peaks of rGOCKS - ZnO namely 23.287 º, 26.781 °, 29.889 °, 32.468 °, 35.109 °, 37.14 °, 39.822 °, 43.559 °, 47.927 °, and 48.537 °. SEM-EDX analysis reveals the surface of graphene sheets containing aggregates in the shape of small particles attached to graphene sheets. The results of the EDX analysis consisted of C 67.82 %, O. 19.2 %, Zn. 7.85 % and 5.13 % impurity. The CV and LSV tests showed that the rGOAK - ZnO electrode with a variation of 1 gram: 0.3 gram had a good response to the oxidation process under visible light. The profile tests of these organic dyes (methylene blue) in concentrations of 0.5 ppm, 1.0 ppm, 2.0 ppm, and 3.0 ppm were applied by Multi Pulse Amperometry (MPA). The performance of the rGOPS - ZnO electrode has been in determining the value of COD by photo electrocatalytic good sensitivity, linearity, limit of detection, repeatability, and service life. The COD value was determined using the rGOPS - ZnO electrode and obtained 2.97897 mg/LO2 close to the theoretical value.
Synthesis of Silver Nanoparticles using Gandaria Seeds Bioreductor Bijang, Catherina M.; Hasanela, Nurani; Joris, Shielda N.; Fransina, Eirene G.; Tahril, Tahril; Azis, Thamrin; Tehuayo, Ahmadin
Jurnal Akademika Kimia Vol. 12 No. 2 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i2.pp142-148

Abstract

The silver nanoparticles (NPP) are synthesized with the chemical reduction method by using a water extract bioreductor of gandaria seed (Bouea macrophylla G.) which acts as a reducing precursor, in this case, AgNO3 Ag+ is reduced to AgO. The concentration of AgNO3 is made between 0.5 mm and 1 mm. The characteristic of NPP is unstable, so a modification is needed with and without the addition of PVA 1 %. The process of NPP shaping is monitored by observing the uptaken of UV - Vis when the color changes occur. The high NPP concentration of AgNO3 has higher absorbance and is wider if compared to the lower AgNO3 concentration. The result of this research based on the absorbance value and the wavelength showed the NPP synthesized without the addition of PVA 1 % (b/v) is wider. The addition of PVA 1 % (b/v) provides better stability and maintains the absorbance of spectrum changes from day to day. The maximum uptaken of UV-Vis from NPP AgNO3 0.5 mm by using green synthesis and 1 mm without adding PVA are 0.946 and 0.980, respectively. However, NPP with the addition of PVA has 0.968 and 0.978 absorbance. The best concentration of NPP produced was 1 mm AgNO3.
Identifikasi dan Uji Aktivitas Antioksidan Senyawa Metabolit Sekunder Ekstrak Tanaman Cleome viscosa L: Identification and Antioxidants Activity Tests of Secondary Metabolite Compounds of Clome viscosa L. Plant Extracts Imran; Nurliana, Laily; Natsir, Muh.; Nohong; Kadir, La Ode Abd; Rudi, La; Ruslan; Azis, Thamrin
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 1 (2023): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i1.16340

Abstract

Cleome viscosa L. has been used empirically by people on the island to treat diseases that have clinical symptoms such as malaria (fever, sweating, chills, and muscle aches). The purpose of this study was to determine the class of secondary metabolites and antioxidant activity. The extraction was carried out using the maceration method, while the fractionation was carried out using the separating funnel. The secondary metabolites found in the Cleome viscosa L. plant extract are alkaloids, flavonoids, steroids, terpenoids, tannins, and saponins. Antioxidant test conducted by DPPH method showed that the positive control of ascorbic acid and methanol extract obtained IC50 values of 3.86 ppm and 37.4 ppm, respectively.
Co-Authors A. Nurwahida Aceng Haetami, Aceng Aden Mula Pratiwi Alimin Alimin, Alimin Alwahab Alwahab Angga Febrian Bijang, Catherina M. C Bijang C Bijang Caterina Bijang Catherina Bijang Dewi Sri Dewi, Dian Puspita Dian Permana Fajrin E. Rosa Fransina, Eirene G. Haris W Hasanela, Nurani Holilah Holilah, Holilah I Wayan Sutapa Imran Imran Imran Imran Imran Irwan Irwan Joris, Shielda N. Juwita, Citra Kadir, La Ode Abd Keke Awaliyah Kelrey, Adhi G. La Aba La Agusu La O. Ahmad La Ode Abd Kadir La Ode Abd Kadir La Ode Ahmad La Ode Kadidae, La Ode La Ode Santiaji Bande La Rudi Laily Nurliana Laily Nurliana Laode A. Kadir Laode A. Kadir Laode Abdul Kadir Laode Abdul Kadir M. Natsir Mansur, Inda Ulfa Matheis F. J. D. P. Tanasale Maulidiyah Maulidiyah Maulidiyah Maulidiyah Maulidiyah Maulidiyah Maulidiyah MAULIDIYAH MAULIDIYAH Muh Natsir Muh. Natsir Muh. Natsir Muh. Natsir, Muh. Muh. Nurdin Muh. Nurdin, Muh. Muh. Zakir Muzakkar Muhammad Nurdin Muhammad Nurdin Muhammad Nurdin Muhammad Nurdin Muslia, Wa O. Muzakkar, Muhammad Zakir Muzakkari, Muhammad Z. Nasriadi Dali Nasriadi, Nasriadi Nohong Nohong Nohong Nohong Nohong Nohong, Nohong Nur Illyyin Akib Nurhaeni R, Halimatussaddiyah Ratna Ratna Ratna Ruslan Ruslan Ruslan Ruslin Ruslin SITTI HADIJAH SABARWATI Sitti Ratna Sri Wahyuni Syahrir T Nurwahida Tahril Tanasale, M.F.J.D.P. Tehuayo, Ahmadin Ulfa H. Syam Viesta Valentin Octavian Wa Ode Harlis Wiwik Handayani Zainal Syam Arifin Zul Arham