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All Journal JURNAL KIMIA SAINS DAN APLIKASI IPTEK The Journal of Engineering JURNAL INTEGRASI PROSES Jurnal Akademika Kimia IJEMS (Indonesian Journal of Environmental Management and Sustainability) Jurnal Ilmiah Teknik Kimia Stannum : Jurnal Sains dan Terapan Kimia Darmabakti : Junal Pengabdian dan Pemberdayaan Masyarakat REACTOR : Journal of Research On Chemistry And Engineering Warta AKAB Jurnal Akademika Kimia Journal of Vocational Studies on Applied Research Jurnal Teknik Kimia dan Lingkungan JPM-AKA Jurnal Teknologi Kimia Mineral Indonesian Journal of Chemical Science Jurnal Akademika Kimia Jurnal Rekayasa Proses
Moh. Azhar Afandy
Program Studi Teknik Kimia Mineral, Politeknik Industri Logam Morowali
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Other

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Phytoremediation of Cr(VI) from Aqueos Solution by Pistia stratiotes L.: Efficiency and Kinetic Models Haeril, Haeril; Sawali, Fikrah Dian Indrawati; Afandy, Moh Azhar
Jurnal Teknik Kimia dan Lingkungan Vol. 8 No. 1 (2024): April 2024
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v8i1.3803

Abstract

Phytoremediation utilizes metal-trapping plants to recover water as the main source of contamination, Pistia Stratiotes L. is a hyperaccumulator plant that is considered capable of reducing hexavalent chromium levels in wastewater. This is evidenced by the results obtained on each of the variables investigated, namely the effect of contact time and the number of plants. Where, the effect of contact time on the most optimal reduction in hexavalent chromium concentration on day 10 is 22.55 mg/ L with an efficiency value of 54.89 %. While the effect of the number of plants on the reduction in the most optimal metal concentration was found in the first reactor with the number of plants 4, chromium concentration was 23.16 mg/ L with an efficiency value of 54.89%. This means that the longer the phytoremediation process will affect the decrease in chromium levels in waste samples but has no effect on the number of plants used if the plant mass is not calculated before treatment. The recommended kinetic models for phytoremediation systems using P. Stratiotes L plants are Richard's Pseudo First Order and Pseudo Second Order. However, when viewed from the prediction value and experimental data, Pseudo Second Order Kinetic Models are considered suitable to describe the phenomenon that occurs in this study, with an SSE value of 1.0042 and a reaction rate constant of 1.1662 day-1 to 1.5623 day-1.
Analyzing the Performance of Reverse Osmosis Membranes After the Cleaning Process: Case study Performed at PT. XYZ. Afandy, Moh. Azhar; Khatimah, Khusnul; Sawali, Fikrah Dian Indrawati
IPTEK The Journal of Engineering Vol 10, No 2 (2024)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i2.a20537

Abstract

PT. XYZ uses a reverse osmosis (RO) system in demin water treatment. One of the weaknesses of the RO system is the formation of fouling on the membrane, which can reduce the performance of the membrane, so it is necessary to carry out an appropriate cleaning process to remove deposits on the surface of the membrane, restore the separation characteristics, and restore the normal capacity of the system. This research aims to examine the effect of cleaning on the performance of reverse osmosis membranes in the PT. XYZ with requirements for reverse osmosis membrane type FILMTEC BW30–400 IG. The research was conducted for 8 weeks by collecting data on the reverse osmosis control box and control room in the form of product flow rate, feed conductivity, and product conductivity. Based on the results of the study, it can be concluded that the effect of cleaning on membrane performance can only extend the life of the membrane and cannot meet the specifications for the working parameters of the reverse osmosis membrane, which can be seen in the salt rejection, salt passage, and flux values obtained in this study.
Adsorpsi Kromium Heksavalen Pada Larutan Aqueous Menggunakan Arang Kayu Teraktivasi Asam: Studi Isotherm Dan Kinetika Afandy, Moh. Azhar; Sawali, Fikrah Dian Indrawati
Jurnal Ilmiah Teknik Kimia Vol. 8 No. 1 (2024): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/jitk.v8i1.35315

Abstract

This research aims to carry out the adsorption process of hexavalent chromium Cr (VI) utilizing activated charcoal generated from acid-activated wood charcoal using HCl and evaluate the adsorption isotherm and kinetics model. The adsorption procedure was carried out in batches with variations in the Cr (VI) adsorbate concentration, and then the total concentration was finally evaluated using UV-VIS spectrophotometry. The isotherm models employed in this research include the Langmuir, Freundlich, and Temkin isotherm models, while the kinetic models used include pseudo-first order, pseudo-second order, Elovich, and Weber-Morris intraparticle diffusion, which may be estimated using linear regression equations. The findings obtained demonstrate that the adsorption capacity value of acid-activated wood charcoal is 1.1686 mg/g, with the greatest efficiency at 83.9623%. The isotherm model parameters found demonstrate that the Langmuir isotherm model is more acceptable for application in this research with values of R2 = 0.9956, qmax = 1.5126 mg/g, and KL = 0.0783 L/g. The Cr (VI) adsorption kinetics model employing acid-activated wood charcoal follows the pseudo-second-order kinetic equation with values of k2 = 0.0162 g/mg/minute, qe = 0.7927 mg/g, and R2 = 0.9543.
Effectiveness of the Combination of Alum (Al₂(SO₄)₃) and Calcium Hydroxide (Ca(OH)₂) Coagulants in the Removal of Manganese (Mn) Using the Coagulation-Flocculation Process: Efektivitas Kombinasi Koagulan Alum (Al2(SO4)3) dan Kalsium Hidroksida (Ca(OH)2) pada Penghilangan Logam Mangan (Mn) Menggunakan Proses Koagulasi-Flokulasi Simanullang, Samuel Putra Mandiri; Afandy, Moh. Azhar; Sawali, Fikrah Dian Indrawati
Stannum : Jurnal Sains dan Terapan Kimia Vol 6 No 2 (2024): October 2024
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v6i2.4301

Abstract

A technique for reducing the contamination of heavy metals in wastewater is the coagulationflocculation method. The approach has various advantages, including a simple process, readilyavailable chemicals, inexpensive equipment costs, and an excellent capacity to remove pollutants. The goal of this research is to see how well Mn-containing wastewater can be reduced using alum and calcium hydroxide as coagulants. The adsorption capacity of the coagulant combination in the floc generation phase of the coagulation-flocculation process can also be calculated. The technique used is coagulation-flocculation, with modifications made to the coagulant content and stirring duration. The data was then evaluated using an Atomic Absorption Spectrophotometer (AAS) to assess the decrease Mn concentration in wastewater. According to the experiments, the combination of alum and calcium hydroxide coagulants with a mass composition ratio of alum:calcium hydroxide (150 mg:50 mg) and a stirring time of 15 minutes has the highest efficiency of 89.35% and is directly proportional to the adsorption capacity value of 446.75mg/gram.
Cr (VI) Removal from Aqueos Solution by Coagulation – Adsorption Integrated System Sawali, Fikrah Dian Indrawati; Setyawan, Fery; Afandy, Moh Azhar; Mustikaningrum, Mega
Indonesian Journal of Chemical Science Vol. 13 No. 1 (2024)
Publisher : Prodi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Industrial wastewater generated by nickel mining has a high content of heavy metals, one of which is Chromium Hexavalent or Cr(VI) metal. Commonly used methods in reducing Cr(VI) metal concentration are coagulation and adsorption. This method is the most economical, simple and highly efficient method. This research uses the coagulation - adsorption integration system method, which is a combination of coagulation and adsorption methods in stages and uses the same wastewater. The purpose of this research is to see the performance of alum, FeSO4 and a combination of alum: FeSO4 as coagulant and fly ash as adsorbent in the removal of Cr(VI) levels in wastewater samples. Also, the efficiency of using the coagulation - adsorption integration system in the removal of heavy metal levels. The adsorption capacity value of this process can also be calculated. The resulting data were then evaluated using a spectrophotometer visible to assess the reduction of Cr(VI) concentration in wastewater. Based on the experiment, alum type coagulant with a waste and coagulant composition ratio of 2:3 and a stirring time of 60 minutes can reduce Cr(VI) levels to 14.18 mg/L from 100 mg/L. The addition of the adsorption process using fly ash helped reduce the concentration of heavy metal Cr(VI) to 12.15 mg/L and the highest efficiency value was 87.9%, and the adsorption capacity value was 0.087 mg/gram.
Comprehensive Study on Cr(VI) Adsorption and Regeneration Behavior of Alkali-Treated Wood Charcoal: Isotherms and Kinetics Models Afandy, Moh. Azhar; Sawali, Fikrah Dian Indrawati
IPTEK The Journal of Engineering Vol. 11 No. 2 (2025)
Publisher : Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember.

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Abstract

The present study considers the adsorption and regeneration behavior of alkali-treated wood charcoal (WC-NaOH and WC-KOH) for Cr(VI) removal. Adsorption isotherms (Langmuir, Freundlich, Temkin, and Dubinin-Raduskevich) and kinetics (Pseudo-first-order and Pseudo-second-orderare being investigated utilizing a non-linear method that provides precise parameter prediction and mechanism elucidation. The outcomes suggested that both WC-NaOH and WC-KOH exhibit good Cr(VI) removal efficiency, with the Langmuir model best explaining the adsorption phase, indicating single-layer adsorption. The kinetic study revealed that the Pseudo-second-order model aligns remarkably well with the data, thereby affirming that chemical adsorption is the predominant mechanism in consideration. A comparative analysis revealed that WC-KOH exhibits a higher amount of adsorption than WC-NaOH, attributable to its enhanced larger surface area as well as micro-porous structure.. Regeneration studies showed the possibility of reuse of both adsorbents. It shows the efficiency of alkali-treated wood charcoal for Cr(VI) decontamination and the advantages of non-linear modeling in adsorption experiments.
Co-Authors Adelina, Dina Al Fuady, Muhammad Iqbal Anang Wahid M.Diah Ardiansah, Ardiansah Arif Rahman Devi Yuni Susanti Eryan Dwi Krisna Fadila, Muhammad Seachan Fery Setyawan Fikrah Dian Indrawati Sawali Firman Aldani Hadiyatni Rita Priyantini Haeril, Haeril Hary Sulistyo Herliawan, Deden Jajang Harly Khatimah, Khusnul Lestary, Rara Ayu Mega Mustikaningrum Muh. Azis Albar J. Muhammad Iqbal Al Fuady Muhammad Seachan Fadila Muslikhin Hidayat Mustikaningrum, Mega Mustikaningrum, Mega Nirwansyah Pangeran, Andi Baso Pra Cipta Buana Wahyu Mustika Putra, Aditya Perdana Samuel Putra Mandiri Simanullang Saputra, Aditya Tri Septiawan, Muhammad Ridwan Simanullang, Samuel Putra Mandiri Siti Nuryanti Suhirman , Suhirman Suhirman Suhirman Wahyudi B. Sediawan Wahyudi Budi Sediawan Yudi Siswanto