Article Per Year (5 Year)
p-Index From 2021 - 2026
2.293
P-Index
This Author published in this journals
All Journal Natural Science: Journal of Science and Technology Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat KOVALEN: Jurnal Riset Kimia Indonesian Journal of Chemistry AR-RAZI Jurnal Ilmiah ULIN: Jurnal Hutan Tropis Jurnal Riset Sains dan Kimia Terapan al Kimiya : Jurnal Ilmu Kimia dan Terapan
Ahmad Ridhay
Department Of Chemistry, Tadulako University, Jl. Sukarno-Hatta Km 9, Palu 94148, Central Sulawesi, Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Engineering Environmental Science Languange, Linguistic, Communication & Media Public Health

Published : 46 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 46 Documents
Search

 1   2   3   4   5 
Sintesis dan Karakterisasi Komposit Mn-N-TiO2/Bentonit untuk Degradasi Polutan Organik: Synthesis and Characterization of Mn-N-TiO2/Bentonite Composite for Organic Pollutants Degradation Ruslan; Prismawiryanti; Sumarni, Ni Ketut; Ridhay, Ahmad; Riski, Mutiara Zalfa; Nurhalisa, Sitti; Marsela, Anggi
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 3 (2024): December 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.2024.v10.i3.17502

Abstract

Research has been conducted on the synthesis and characterization of Mn-N-TiO2/Bentonite composites for the degradation of organic pollutants. This study aims to synthesize the Mn-N-TiO2/Bentonite composite as a catalyst in degrading congo red in visible light and to determine the effect of irradiation time on the effectiveness of photodegradation of congo red catalyzed Mn-N-TiO2/Bentonite. The synthesis of the Mn-N-TiO2/Bentonite composite was carried out using the sol-gel method. Characterization was carried out with UV-Vis DRS, XRD, FTIR, and SEM-EDX. A photocatalytic activity test on Congo red degradation was carried out using ultraviolet and visible lamps. The results of the characterization of the Mn-N-TiO2/Bentonite configuration show that the band gap energy of Mn-N- TiO2/Bentonite with a variation of 5 g has a band gap energy of 2.14 eV with anatase crystal form. In the IR spectrum, there is a shift in wave number from 1634.49 to 1433.11cm-1, there is the vibration of the NO bond, absorption below 1000 cm-1 indicates the presence of Mn-O bonds, and absorption at wave number 1049.28 cm-1 indicates the presence of ions. manganese metal trapped in the TiO2 matrix. This spectrum indicated the presence of manganese and nitrogen. These results were confirmed by the EDX instrument, which showed the presence of 0.60% Mn and 0.04% N. SEM results show that particles that are still agglomerated and have a large size, which is influenced by water vapor in the TiO2 crystal structure. The results showed that the photodegradation activity increased significantly up to 40.9075% at 30 minutes of irradiation for the Mn-N- TiO2/Bentonite composite and 20.0225% under exposure to ultraviolet light.
Studi Variasi Suhu dan Kosentrasi Larutan Asam Sitrat terhadap Karakteristik Silika Daun Tebu menggunakan Metode Leaching Abustiana, Rahma Lolita; Mirzan, Muhamad; Sosidi, Husain; Khairuddin; Ridhay, Ahmad; Jusman
Jurnal Riset Sains dan Kimia Terapan Vol. 11 No. 1 (2025): Jurnal Riset Sains dan Kimia Terapan, Volume 11 Nomor 1, Juni 2025
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.111.04

Abstract

Telah dilakukan penelitian tentang studi variasi suhu dan konsentrasi larutan asam sitrat terhadap karakteristik silika daun tebu menggunakan metode leaching dengan 3 variasi suhu 60ºC, 80ºC, 100ºC dan 3 variasi konsentrasi 8%, 10%, 12%. Metode yang dilakukan ialah preparasi daun tebu, sintesis silika daun tebu menggunakan metode leaching dengan asam sitrat, dan pembakaran daun tebu hasil leaching asam sitrat. Pengujian dilakukan untuk memperoleh silika murni. Tujuan dari penelitian ini adalah untuk mengetahui variasi suhu dan konsentrasi larutan asam sitrat terhadap karakteristik silika daun tebu yang diperoleh dengan metode leaching. Hasil penelitian diperoleh 3 analisis yaitu, untuk analisis XRD menunjukan didapatnya hasil struktur silika yang masih amorf. Analisis FTIR menunjukan gugus fungsi yang terbentuk yaitu -OH, Si-O-Si dan Si-O. Analisis SEM menunjukan bahwa semakin tinggi suhu leaching yang diberikan terhadap sampel maka ukuran butir semakin merata.
Penentuan fenolik total daun, kulit batang, dan batang tumbuhan afrika (Vernonia amygdalina Del) Erwin, Erwin; Rahmadani, Indah Ashari; Alimuddin, Alimuddin; Ridhay, Ahmad
ULIN: Jurnal Hutan Tropis Vol 6, No 2 (2022)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32522/ujht.v6i2.8736

Abstract

flavonoidVernonia amygdalina Del) adalah salah satu tanaman obat yang berasal dari Afrika yang menyebar sampai ke Asia, termasuk Indonesia. Vernonia amygdalina Del  dikenal dengan nama lokal tanaman Afrika. Tanaman ini secara tradisional telah dimanfaatkan sebagai obat diabetes, demam, hipertensi dan asam urat.  Tujuan penelian ini adalah menentukan kadar flavonoid total ekstrak daun, kulit batang dan kayu batang tanaman Afrika. Masing-masing sampel (daun, kulit batang dan batang Afrika) diekstraksi kemudian ditentukan kandungan flavonoid totalnya. Berdasarkan hasil penentuan kadar flavonoid dari ekstrak daun, kulit batang dan batang Afrika diketahui bahwa ekstrak batang memiliki kadar flavonoid total yang paling banyak sebesar 418,15 mg QE/g ekstrak.
Isolation and Characterization of Flavonoid Derivative of Ethyl Acetate Extract from Bauhinia latisiliqua Stem Bark and Its Activity as Antioxidant Sabarwati, Sitti Hadijah; Indriani, Indriani; Nurhaeni, Nurhaeni; Ridhay, Ahmad; Satrimafitrah, Pasjan; Hardi, Jaya; Sikanna, Rismawaty
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 10 No. 2 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i2.30372

Abstract

Various bioactivities on natural compounds, the antioxidant potency can provide a broad spectrum in their utilization and development into medicinal raw material. One of the plants that have potency for antioxidant activity is the Kemerakan sapenit (Bauhinia latisilqua) plant. The study aimed to isolate, characterize, and determine the antioxidant activity of a compound isolated in the ethyl acetate extract of the stem bark of B. latisilqua. This research includes extraction, fractionation, purification, and elucidation of secondary metabolite structure as well as testing its antioxidant activity. Extraction was carried out by maceration technique, fractionation, and purification using liquid vacuum chromatography and gravitation column chromatography. The elucidation of the structural compound was determined by analysis of the UV, IR, and NMR spectra. The antioxidant test was performed using the DPPH method. Based on the analysis of the spectral data, the isolated compound was catechin, a derivative of flavan-3-ol. Antioxidant test on catechin compound showed a strong antioxidant with an IC50 value of 35.01 µg /mL (IC50 for positive control, ascorbic acid, of 42.94 µg /mL).
Analisis Kadar Kadmium (Cd) dalam Bawang Merah Lokal Palu (Allium cepa L. var. aggregatum) pada Berbagai Lokasi dan Umur Tanam: Analysis of Cadmium (Cd) in Palu Local Shallots (Allium cepa L. var. aggregatum) at Various Locations and Planting Ages Lindawati, Eka; Khairuddin, Khairuddin; Nurhaeni; Ruslan; Ridhay, Ahmad; Sosidi, Husain; Rahim, Erwin Abdul; Syamsuddin
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.i1.16287

Abstract

The local Palu shallot (Allium cepa L. var. aggregatum) plant is one of the leading products in the Central Sulawesi region. Shallots can experience a decrease in quality if they are contaminated with heavy metals, such as cadmium (Cd) in amounts that exceed the threshold. This study aims to determine the effect of planting age on cadmium levels in local Palu shallots cultivated in Oloboju Village and Solove Village, Biromaru District, Sigi Regency. The research variables used were the planting age which consisted of 4 levels (age 40, 50, 60, and 70 days), and the planting location which consisted of 2 levels (Solove Village and Oloboju Village). Cd levels were analyzed using an Atomic Absorption Spectrophotometer (AAS). Cadmium levels in shallot roots at two planting locations decreased with increasing planting age, from 101.34 - 107.18 mg/kg at 40 days of age to 1.68-3.78 mg/kg at 70 days of age. Shallot bulbs at two locations had lower cadmium levels than roots, namely 0.01-0.04 mg/kg. The results of the study found that planting time had a significant effect on cadmium levels in the roots of shallots, but planting age and planting location had no significant effect on cadmium levels in local Palu shallot bulbs with levels that met the SNI (Indonesian national standard) quality requirements
Penentuan Kadar Albumin Ikan Gabus (Channa striata) dengan Metode Biuret setelah Dikukus dan Dipepes: Determination of Albumin Content of Snakehead Fish (Channa striata) by Biuret Method after Steamed and Wrapped Naser, Inda Hastuti N; Bahri, Syaiful; Satrimafitrah, Pasjan; Razak, Abd. Rahman; Ruslan; Ridhay, Ahmad; Puspitasari, Dwi Juli; Khairuddin
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August 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.i2.16391

Abstract

Snakehead fish (Channa striata) is a type of freshwater fish that contains high levels of protein albumin. The research was conducted to determine the albumin content in snakehead fish after the cooking process, both steamed and wrapped. The research was conducted using a completely randomized design with a factorial pattern, the first factor was the cooking method (steamed and wrapped) and the second was cooking time (10, 15, 20, and 20 minutes). Determination of protein albumin levels in snakehead fish after processing using the Biuret method. The steaming process for 15 minutes resulted in protein content in the snakehead fish of 0.76%, while the protein albumin that was lost was 19.28%. The wrapped method for 20 minutes has a remaining protein content of 0.59%, while the missing protein is 38.78%. The method of processing snakehead fish by steaming is better than the wrapping process.
Co-Authors Abd. Rahman Razak Abd. Rahman Razak Abd. Rahman Razak Abustiana, Rahma Lolita Agriyani Marcelinda, Agriyani Aini Auliana Amar Aini Hoiriyah, Aini Alfian Noor Asniawati Asniawati Baehaqi Betzy Eppang Bryan Agung Rundubelo Darwin Darwin Debi Christa Ondagau Deddy Firman Didit Purwanto Djumidar Dwi Juli Puspitasari Dwi Juli Pusptasari Erwin Abdul Rahim Erwin Erwin Fatiah Riskah Fitrianingsih Mozin Gilang Almilda Hardi Ys Hardi Ys Husain Sosidi I Nyoman Adi Putra Ian van Altena Indriani Indriani Indriani Indriani Indriani Indriani Isabella de Nadra Ivitri Susana Jaya Hardi Jusman, Jusman Khairuddin Khairuddin - Khairuddin Khairuddin Kurniawati Kurniawati Lindawati, Eka Magfira Magfira Mappiratu Mappiratu Mappiratu Mappiratu Marsela, Anggi Mirzan, Muhamad Moh. Mirzan Moh. Mirzan Mohamad Afdal Musafira Musafira Musdalifah Musdalifah Naser, Inda Hastuti N Ni Ketut Sumarni Ni Luh Sumitriasih Nov Irmawati Inda Nunuk H. Soekamto Nur Faidah Nur Istiqomah Nur Madinah Rizal Nur'ain Nur'ain Nurakhirawati Nurakhirawati Nurakhirawati Nurhaen, Nurhaen Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhalisa, Sitti Nurmila Nurmila Nurul Bima Khasanah NURUL CHOLIFAH Oktavian Mangela Parwati Parwati Pasjan Satrimafitrah Patrisia Marcevin Rengku Pratiwi Listyana Sareu Prismawiryanti Prismawiryanti Rahma Wati Rahmadani, Indah Ashari Ripdayana Ripdayana Riski, Mutiara Zalfa Ruslan Ruslan Ruslan Sabarwati, Sitti Hadijah Siti Helmyati Sitti Nur Halizah SYAIFUL BAHRI Syaiful Bahri Syaiful Bahri Syamsuddin Syamsuddin Syamsuddin Tjodi Harlim Ulayya Kasio Vivi Sasmita Winarsii, Dessy