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All Journal Tsaqofah: Jurnal Penelitian Guru Indonesia MASALIQ: Jurnal Pendidikan dan Sains
Deski Beri
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Religion Education Social Sciences

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Pengaruh Doping Ag pada Sintesis Nanopartikel CuO dan Aktivitas Fotokatalitik untuk Degradasi Rhodamin B Aysha Famil Hidayah; Hary Sanjaya; Desy Kurniawati; Deski Beri
MASALIQ Vol 6 No 2 (2026): MASALIQ: Jurnal Pendidikan dan Sains
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.8984

Abstract

Textile dye wastewater contamination, particularly by Rhodamine B, is a serious environmental problem because it is toxic and difficult to degrade naturally. This study aimed to synthesize and evaluate the photocatalytic performance of pure CuO nanoparticles and Ag-doped CuO for the degradation of Rhodamine B. The materials were synthesized using the sol–gel method with an Ag doping concentration of 0.2 mmol. The optical properties were characterized using UV–Diffuse Reflectance Spectroscopy (UV-DRS) in the wavelength range of 185–1100 nm to determine the bandgap energy values using the Kubelka–Munk equation. Photocatalytic activity was tested through the degradation of Rhodamine B under visible light irradiation, with absorbance measurements obtained using a UV–Vis spectrophotometer at a maximum wavelength of 554 nm. The results showed that Ag doping reduced the CuO bandgap from 1.4819 eV to 1.2539 eV. Photocatalytic tests revealed that Ag-doped CuO exhibited higher activity than pure CuO, with Rhodamine B degradation reaching 60.55% at 90 minutes of irradiation, compared with only 32.72% for pure CuO at the same reaction time. This enhanced photocatalytic activity is associated with the role of Ag in suppressing electron–hole recombination, increasing light absorption through the surface plasmon effect, and providing more active sites on the catalyst surface. These findings confirm that Ag-doped CuO has promising potential as an effective photocatalyst for the treatment of textile dye wastewater and the control of environmental pollution.
Verifikasi Metode Pengujian Kadar Besi (Fe) dalam Asam Klorida Teknis Sesuai SNI 2557-2015 Atiqah Fajriani; Deski Beri
TSAQOFAH Vol 6 No 3 (2026): TSAQOFAH: Jurnal Penelitian Guru Indonesia
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v6i3.9789

Abstract

Analysis of metal content in industrial chemicals has been widely studied, but research that specifically discusses the verification of the UV-Vis spectrophotometric method in determining iron (Fe) content in technical-grade hydrochloric acid according to national standards remains limited. This study aims to verify the feasibility of the UV-Vis spectrophotometric method in analyzing iron (Fe) content based on method validation parameters. This study employed a quantitative approach with a laboratory experimental design. The research sample consisted of technical-grade hydrochloric acid selected through the purposive sampling technique. Data were collected using a UV-Vis spectrophotometer and supporting laboratory equipment and were then analyzed using linear regression through a calibration curve, as well as testing of precision, accuracy, and recovery parameters. The results show that the method used had very good linearity, with an r² value of 0.9993, precision that met the criterion of %RSD < 2/3 Horwitz CV, and recovery values in the range of 89–104%, which were in accordance with the acceptance standards. These findings indicate that the UV-Vis spectrophotometric method is valid and feasible for use in analyzing iron content in technical-grade hydrochloric acid according to SNI 2557:2015. This study contributes to the development of spectrophotometry-based chemical analysis methods and broadens understanding of method verification in the context of industrial laboratories. The conclusion of the study emphasizes that method validation parameters play an important role in ensuring the accuracy of analytical results. The practical implication is that industrial laboratories need to consistently implement verification procedures to maintain the quality and reliability of testing results.
Analisis Kandungan Logam Berat Cu dan Zn dengan Metode Spektrofotometri Serapan Atom (SSA) dalam Air Limbah Industri Nanda Aulia Putri; Deski Beri
TSAQOFAH Vol 6 No 3 (2026): TSAQOFAH: Jurnal Penelitian Guru Indonesia
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v6i3.9790

Abstract

Industrial wastewater is a by-product of production processes that generally has low quality because it contains various contaminants, including heavy metals, with types and concentrations depending on the characteristics of the industry that produces it. This study aims to analyze the content of copper (Cu) and zinc (Zn) metals in wastewater samples using the flame Atomic Absorption Spectrophotometry (AAS) method. This study employed a quantitative approach with a laboratory experimental design. The analysis was conducted by preparing standard solutions to obtain calibration curves as the basis for determining metal concentrations in the samples. The results show that the calibration curves had very good linearity, with coefficient of determination (R²) values of 0.9989 for Cu and 0.9956 for Zn. The concentrations of Cu metal in the samples were -0.0599 ppm and -0.0647 ppm, respectively, while the concentrations of Zn were 0.0426 ppm and -0.0072 ppm, respectively. Negative values indicate that the metal concentrations were below the detection limit of the instrument. Based on these results, the Cu and Zn contents in the wastewater samples were still below the quality standards stipulated in Regulation of the Minister of Environment of the Republic of Indonesia Number 5 of 2014, so they did not indicate a significant level of pollution. The conclusion of this study emphasizes that the flame AAS method is effective for analyzing heavy metals at low concentrations. The practical implication is that this method can be applied in monitoring industrial wastewater quality to support environmental pollution control.
Penentuan Nilai Iodine Value, Cold Point, Melting Point dan Free Fatty Acid (FFA) pada Produk RBDPOL dan RBDPS di PT. Wilmar Nabati Padang Putri Pramana Arnum; Deski Beri
TSAQOFAH Vol 6 No 3 (2026): TSAQOFAH: Jurnal Penelitian Guru Indonesia
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v6i3.9924

Abstract

Quality control of palm oil derivative products is an important aspect to ensure that the quality of RBDPOL and RBDPS complies with industry standards. This study aims to determine the Iodine Value, Cloud Point, Melting Point, and Free Fatty Acid (FFA) values of RBDPOL and RBDPS products at PT Wilmar Nabati Indonesia Teluk Bayur Padang Unit. This study used a quantitative descriptive approach with a laboratory practice method. The research samples consisted of RBDPOL IV-56, RBDPOL IV-58, and RBDPS taken directly from production points using jar bottles. Data were collected through laboratory testing, observation, and focused discussions with mentors and the Head of Quality Control. The results showed that RBDPOL IV-56 met PORAM standards for all parameters tested, with an Iodine Value of 56.25–56.91 I₂/100 g, a Cloud Point of 9.6–9.8°C, and a Melting Point of 21.2–21.8°C. RBDPOL IV-58 mostly met the standards, although some Iodine Value and Cloud Point values did not meet the standards at the initial stage of testing. Meanwhile, RBDPS showed Melting Point values that met the standards, whereas several Iodine Value values in the initial period were still below the standards. These findings confirm that laboratory analysis plays an important role in quality control of CPO processed products. The practical contribution of this study lies in strengthening applied understanding of the implementation of chemical analysis in quality control processes in the palm oil industry.
Co-Authors Atiqah Fajriani Aysha Famil Hidayah DESY KURNIAWATI Hary Sanjaya Nanda Aulia Putri Putri Pramana Arnum