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Doping TiO2 with Cr and Cu Elements from Electroplating Wastewater as a Single Source for Improvement of the Photocatalyst Activity under Visible Light in the Degradation of Anionic Surfactant Wahyuni, Endang Tri; Budi, Sulistyaning; Aurellia, Dea; Widianti, Rizky Aprilia; Lestari, Novianti Dwi; Jaafar, Nur Farhana; Suherman, Suherman
Indonesian Journal of Chemistry Vol 24, No 4 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93928

This paper discusses the use of electroplating wastewater containing Cr and Cu as a single dopant source to improve the activity of TiO2 photocatalysts under visible light. Sol-gel doping was used to dop TiO2 with Cr and Cu in the wastewater. The doped TiO2 photocatalysts were characterized using SRUV/visible and XRD instruments, and their effect on the degradation of linear alkyl benzene sulphonate (LAS) in laundry wastewater was evaluated. The electroplating wastewater used in this research contains Cr and Cu about 2000 and 20 mg/L, respectively. These metals were successfully doped into a TiO2 structure, which significantly reduced the gap energy of TiO2, allowing it to be more active under visible light. The highest photodegradation of the 125 mg/L LAS in 25 mL of the laundry wastewater with pH 7 was achieved by using 30 mg of TiO2/Cr-Cu (200/2) photocatalyst, which degraded up to 60% of LAS in 60 min. With the same conditions, the LAS photodegradation increased to 100% upon the second run. This approach can help turn hazardous electroplating wastewater into a valuable material to solve environmental problems.

OPTIMALISASI MODEL PROBLEM-BASED LEARNING (PBL) BERBASIS KONTEKSTUAL UNTUK MENINGKATKAN PEMAHAMAN KONSEP SISWA Aprilia, Nurkintan; Wahyuni, Endang Tri; Listyowati, Lilis
Journal of Lesson Study in Teacher Education Vol. 3 No. 2 (2024): Volume 3 No 2 2024
Publisher : Litbang PWM Jawa Tengah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51402/jlste.v3i2.146

The application of the contextual Problem-Based Learning (PBL) model is considered to enhance students' conceptual understanding of redox reactions and voltaic cells. In the context of the 21st century, which demands critical thinking, collaboration, and creativity, a learning approach that connects theory with real-life situations is crucial for developing these skills. This study aims to optimize the effectiveness of the contextual-based PBL model in enhancing students' conceptual understanding. The method used is reflective classroom action research (CAR), with two cycles based on the stages of Kemmis and McTaggart, utilizing assessment results and learning observations. The research results show a significant improvement in students' conceptual understanding. The average student score increased from 59.03 in the pre-cycle to 81.14 in cycle 1, and 88.81 in cycle 2. In addition, the percentage of student mastery also increased, from 41.67% in the pre-cycle to 66.67% in cycle 1, and reached 83.33% in cycle 2. This improvement demonstrates the effectiveness of implementing the contextual-based PBL model in enhancing students' conceptual understanding, particularly on complex materials such as redox reactions and voltaic cells.

OPTIMALISASI MODEL PROBLEM-BASED LEARNING (PBL) BERBASIS KONTEKSTUAL UNTUK MENINGKATKAN PEMAHAMAN KONSEP SISWA Aprilia, Nurkintan; Wahyuni, Endang Tri; Listyowati, Lilis
Journal of Lesson Study in Teacher Education Vol. 3 No. 2 (2024): Volume 3 No 2 2024
Publisher : Litbang PWM Jawa Tengah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51402/jlste.v3i2.146

The application of the contextual Problem-Based Learning (PBL) model is considered to enhance students' conceptual understanding of redox reactions and voltaic cells. In the context of the 21st century, which demands critical thinking, collaboration, and creativity, a learning approach that connects theory with real-life situations is crucial for developing these skills. This study aims to optimize the effectiveness of the contextual-based PBL model in enhancing students' conceptual understanding. The method used is reflective classroom action research (CAR), with two cycles based on the stages of Kemmis and McTaggart, utilizing assessment results and learning observations. The research results show a significant improvement in students' conceptual understanding. The average student score increased from 59.03 in the pre-cycle to 81.14 in cycle 1, and 88.81 in cycle 2. In addition, the percentage of student mastery also increased, from 41.67% in the pre-cycle to 66.67% in cycle 1, and reached 83.33% in cycle 2. This improvement demonstrates the effectiveness of implementing the contextual-based PBL model in enhancing students' conceptual understanding, particularly on complex materials such as redox reactions and voltaic cells.

Implementation Of Chemistry Learning Through Guided Inquiry Using Small Scale Laboratory Media On Science Process Skills Salfiah, Salma; Hidayah, Fitria Fatichatul; Wahyuni, Endang Tri
LAVOISIER: Chemistry Education Journal Vol 3, No 2 (2024)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v3i2.12638

Science process skills are very important for students to have, but their optimization is still low. It requires student-centered learning, namely guided inquiry an open sexta media small scale laboratory to assist inquiry activities in schools which are still constrained in carrying out practicums in laboratories. The purpose of this study was to analyze tha level of science process skill through open inquiry learning and guided inquiry using small scale laboratory scuta media to compare the two types of quasi-experimental research conducted at Ma’arif Karangawen High School. The design used in Noneqivalent Control Group Design. Data collection techniques namely pretest/posttest and non-test namely by observation, then tested with n-gain, normality test, homogeneity test, and hypothesis testing (t-test) and non-test data analysis. So the results of science process skill with guided inquiry learning are superior to the open inquiry learning method, indicate by the higher average value of the control class using the guided inquiry metod, namely 55,58, an increase 35,58% and n-gain value of 0,44 in the medium category. The experimental class used the open method, namely 50,15, an increase of 27,57% and an n-gain value of 0,35 in the medium category.

Integrated and Sequential Enzyme-Assisted Extraction of Fucoidan and Alginate from Sargassum echinocarpum Sugiono, Sugiono; Hidayat, Mohammad Taufiq; Wahyuni, Endang Tri; Syafii, Syafii; Fikriyatullatifah, Anisa; Mumtazah, Lutfia Anis
The Journal of Experimental Life Science Vol. 15 No. 2 (2025)
Publisher : Graduate School, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jels.2025.015.02.05

The sequential extraction biorefinery process can use brown algae as its feedstock, offering a sustainable approach to maximizing the utilization of marine biomass for high-value bioactive compounds. This method enables the recovery of multiple bioactive components from a single raw material, increasing process efficiency and reducing waste. Fucoidan and alginate, two valuable polysaccharides in brown algae, have attracted significant attention due to their diverse applications in the pharmaceutical, nutraceutical, and food industries. This research aims to develop an enzyme-assisted extraction (EAE) process that maximizes the fucoidan yield of Sargassum echinocharpum in the integrated alginate and fucoidan extraction biorefinery process. The effect of the parameter process, including temperature, time, and solvent-to-algae ratio, was evaluated to maximize fucoidan and alginate yield and determine the correct equation model in the first order of the experiment. The study showed that temperature, time, and the ratio of solvents all had a real effect on how quickly the fucoidan and alginate yields increased and then decreased after reaching their highest point. The temperature of 50°C, time of 24 hours, and the solvent-to-algae ratio of 30:1 (v/w) resulted in the highest fucoidan yield of 4.25% and alginate yield of 35.3%, along with an intrinsic viscosity of 78.91 mL.g-1, molecular weight of 73.58 kDa, and an M/G ratio of 0.35. Statistical analysis revealed a quadratic relationship, suggesting the presence of an optimal extraction condition. These findings highlight the potential of enzyme-assisted biorefinery techniques for improving fucoidan and alginate extraction. This extraction process demonstrates significant potential for industrial-scale application in the food, pharmaceutical, and nutraceutical industries due to its efficiency and sustainability.

Implementation Of Chemistry Learning Through Guided Inquiry Using Small Scale Laboratory Media On Science Process Skills Salfiah, Salma; Hidayah, Fitria Fatichatul; Wahyuni, Endang Tri
LAVOISIER: Chemistry Education Journal Vol 3, No 2 (2024)
Publisher : UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/lavoisier.v3i2.12638

Science process skills are very important for students to have, but their optimization is still low. It requires student-centered learning, namely guided inquiry an open sexta media small scale laboratory to assist inquiry activities in schools which are still constrained in carrying out practicums in laboratories. The purpose of this study was to analyze tha level of science process skill through open inquiry learning and guided inquiry using small scale laboratory scuta media to compare the two types of quasi-experimental research conducted at Ma’arif Karangawen High School. The design used in Noneqivalent Control Group Design. Data collection techniques namely pretest/posttest and non-test namely by observation, then tested with n-gain, normality test, homogeneity test, and hypothesis testing (t-test) and non-test data analysis. So the results of science process skill with guided inquiry learning are superior to the open inquiry learning method, indicate by the higher average value of the control class using the guided inquiry metod, namely 55,58, an increase 35,58% and n-gain value of 0,44 in the medium category. The experimental class used the open method, namely 50,15, an increase of 27,57% and an n-gain value of 0,35 in the medium category.

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