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All Journal Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan IJCR (Indonesian Journal of Chemical Research)
Lestari, Ajeng Yulianti Dwi
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Materials Science & Nanotechnology

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Magnetically modified corn cob as a new low-cost biosorbent for removal of Cu (II) and Zn (II) from wastewater Lestari, Ajeng Yulianti Dwi; Chafidz, Achmad; Hapsari, Anindita Ratih; Elnaufal, Wildan Denly; Indri, Silvi Nurukma; Alatas, Mukhsin Moh; Mulyono, Sarwono
Jurnal Bahan Alam Terbarukan Vol 9, No 2 (2020): December 2020 [Nationally Accredited - Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v9i02.27136

Abstract

Wastewater containing heavy metals can potentially harm the human and living organisms and also damage the environment and ecosystem. Wastewater containing total copper (Cu) and zinc (Zn) over the normal threshold will result in Wilson's disease and digestive health, respectively. One of the most widely used methods to remove heavy metals from wastewater is adsorption. One type of adsorbent that has gained interest among researchers was biomass-based adsorbent or biosorbent. In this work, magnetic modification was used to increase the adsorption capacity of the biosorbent. Therefore, the aim of this study was to determine the effect of magnetic modification of corncobs as biosorbent on the adsorption of Cu(II) and Zn(II) heavy metals from an aqueous solution. Magnetic modification with FeCl3.7H2O on corncobs has successfully increased the adsorption capability of Zn(II) and Cu(II) from aqueous solution. The optimum modification ratios for the adsorption of Zn(II) and Cu(II) were 1:2 and 2:1. The adsorption of these both heavy metals took place at temperature of 50°C with the adsorbent doses of 1 g and 1.5 g for Cu(II) and Zn(II), respectively. The highest adsorption percentages for the adsorption of Zn(II) and Cu(II) were 89.3% and 89.2%, respectively. Whereas, the maximum adsorption capacities of Cu(II) and Zn(II) were 75.76 mg/g and 63.93 mg/g, respectively. The adsorption mechanism of Zn(II) and Cu(II) has followed the Freundlich isothermal adsorption model.
Studi Perancangan Material Komposit Berbahan Dasar Kitosan dan Selulosa Sebagai Langkah Pengendalian Limbah Tekstil Methylene Blue Budiman, Yosef; Putra, Eka Rahmat; Lestari, Ajeng Yulianti Dwi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

The amount of methylene blue (MB) in water bodies is one of the environmental issues that still need to be considered. The vast concentration of MB may increase the chemical oxygen demand level, so it has the potential to disrupt aquatic ecosystems. On the other hand, the adsorption process is one of the best methods that functionalizes as a utility for dye removal. This research studied the MB adsorption characteristic using cellulose-based adsorbent from banana fronds. Adsorbents were synthesized and modified using chitosan, bentonite, and acid addition. The adsorption process occurred at various concentrations of MB (40, 60, 80, 100, and 120 ppm) then the result will be proved and calculated by analysis using UV Vis and FTIR Spectrophotometer. The result showed that the bentonite addition could not increase the adsorption capacity optimally due to fluctuating spectrum of UV-Vis. In conclusion, the adsorbent can absorb MB in wastewater which is the optimal condition at 80 ppm for 24 hours.
Sintesis Nanopartikel Seng Oksida (ZnO) dari Limbah Baterai untuk Uji Antimikroba Ekstrak Tanaman Apium graveolens L. terhadap Bakteri Staphylococcus epidermidis Maulana, Apriyan Bima; Asih, Putri Jeni; Azizah, Salsabila Nur; Aisyah, Aisyah; Aprilliani, Dininur; Lestari, Ajeng Yulianti Dwi
INDONESIAN JOURNAL OF CHEMICAL RESEARCH Vol. 10 No. 1 (2025): Volume 10, ISSUE 1, 2025
Publisher : Chemistry Department, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijcr.vol10.iss1.art3

Abstract

Battery waste contains hazardous materials that can damage the environment if not properly treated. One innovative solution for managing this waste is the synthesis of zinc oxide (ZnO), known for its strong antimicrobial properties. Additionally, Apium graveolens L. extract is recognized for its significant antibacterial activity. This study aims to synthesize ZnO nanoparticles from battery waste and evaluate their effectiveness in enhancing the antimicrobial activity of Apium graveolens L. extract against Staphylococcus epidermidis. ZnO was synthesized using the coprecipitation method from Zn-C battery waste, and Apium graveolens L. extract was obtained through maceration. The ZnO characterization was conducted using XRD and FTIR, and antimicrobial tests were performed against Staphylococcus epidermidis. The results showed that the synthesized ZnO nanoparticles had an average crystallite size of 41.611 nm with high crystallinity. When combined with Apium graveolens L. extract, the crystallite size became smaller, at 16.881 nm. Antimicrobial tests revealed that ZnO effectively inhibited the growth of S. epidermidis with an inhibition zone of 16 mm, while the combination of ZnO with Apium graveolens L. extract did not show antimicrobial activity. Thus, ZnO synthesized from battery waste is proven to be effective as an antimicrobial agent against S. epidermidis. This synthesis method is also environmentally friendly and has broad application potential.
Studi Perancangan Material Komposit Berbahan Dasar Kitosan dan Selulosa Sebagai Langkah Pengendalian Limbah Tekstil Methylene Blue Budiman, Yosef; Putra, Eka Rahmat; Lestari, Ajeng Yulianti Dwi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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

Abstract

The amount of methylene blue (MB) in water bodies is one of the environmental issues that still need to be considered. The vast concentration of MB may increase the chemical oxygen demand level, so it has the potential to disrupt aquatic ecosystems. On the other hand, the adsorption process is one of the best methods that functionalizes as a utility for dye removal. This research studied the MB adsorption characteristic using cellulose-based adsorbent from banana fronds. Adsorbents were synthesized and modified using chitosan, bentonite, and acid addition. The adsorption process occurred at various concentrations of MB (40, 60, 80, 100, and 120 ppm) then the result will be proved and calculated by analysis using UV Vis and FTIR Spectrophotometer. The result showed that the bentonite addition could not increase the adsorption capacity optimally due to fluctuating spectrum of UV-Vis. In conclusion, the adsorbent can absorb MB in wastewater which is the optimal condition at 80 ppm for 24 hours.
Co-Authors Aisyah Aisyah Alatas, Mukhsin Moh Aprilliani, Dininur Asih, Putri Jeni Azizah, Salsabila Nur Budiman, Yosef Chafidz, Achmad Elnaufal, Wildan Denly Hapsari, Anindita Ratih Indri, Silvi Nurukma Maulana, Apriyan Bima Mulyono, Sarwono Putra, Eka Rahmat