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All Journal Program Kreativitas Mahasiswa - Penelitian JOIV : International Journal on Informatics Visualization Indonesian Journal of Chemical Analysis (IJCA)
Ganjar Fadillah, Ganjar
Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Sebelas Maret
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Environmental Science

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PERANAN ZEOLIT NANOPORI TERMODIFIKASI SEBAGAI MATERIAL PENGONTROL PELEPASAN PUPUK UREA Hidayat, Rahmat; Fadillah, Ganjar; Chasanah, Uswatul; Wahyuningsih, Sayekti
Program Kreativitas Mahasiswa - Penelitian PKM-P 2014
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.306 KB)

Abstract

Effectiveness of catalyst zeolite nanoporous as a slow release fertilizer of nitrogen from urea has been researched. In this study, natural zeolite was activated by HF 1%  with a calsination temperature at 120oC and the surface of zeolite was modified by aminopropyltrimethoxysilane (APTMS) 5%. Zeolite activation was characterized by X-ray diffraction spectroscopy (XRD) and Surface Area Analyzer (SAA) while the modified zeolite was characterized by infrared spectroscopy (FTIR), Surface Area Analyzer (SAA) and UV-Vis spectroscopy. The results of the material characterization of zeolite-APTMS obtained size pore of 7,74 nm with a maximum adsorption capacity of urea was 3.668 mg/g. Slow release urea test  from zeolite-APTMS performed by observing the absorbance of the urea at a wavelength of 195 nm with a variation of time 0, 5,10,20,40,60,80,100 and 120 minutes The test of fertilizers in the soil is directly done by observing changes pH and release of NH4+ in the incubation time of 14 days. The results show that urea without zeolite will be released 100% in the 120 minute and zeolite-APTMS aqueous solution at minute 120 only released about 56,24%. While the application of fertilizers in the soil is directly obtained that urea with zeolite having a pH decrease slowly compared to urea without zeolite. It is addressed that the zeolite-APTMS potentially be developed as a release control material of nitrogen from urea is caused due to the ability of the zeolite to absorb urea-APTMS temporarily in the pore and hydrogen bonding interactions between the urea and N-H from APTMS. Keywords:  zeolite, zeolite-APTMS, urea, slow release fertilizer
Cluster Mapping of Waste Exposure Using DBSCAN Approach: Study of Spatial Patterns and Potential Distribution in Bantul Regency Fauzan, Achmad; Fadillah, Ganjar; Fitria, Annisa; Adriana, Hannura; Bariklana, Muhammad
JOIV : International Journal on Informatics Visualization Vol 8, No 2 (2024)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62527/joiv.8.2.2475

Abstract

High level of plastic waste production is a common issue in various places, including the Special Region of Yogyakarta province. It is proven that the Piyungan Integrated Waste Disposal Site (TPST) or Final Disposal Site (TPA) in Bantul Regency has been closed several times due to capacity exceeding the quota and some blockages from residents around the TPA. Issues related to microplastic contamination resulting from discarded plastic waste are fascinating to study, considering the long-term impact of microplastic contamination on human health. This research aims to map the distribution of locations with the potential for waste accumulation to reduce the negative consequences of microplastic contamination. The population used included TPS and markets in Bantul District, with the sample being the distribution of TPS and market points in Bantul District in 2023. The results of checking the point distribution pattern using the quadrant and nearest neighbor method showed that the distribution of waste accumulation points had a clustered design; thus, it could be continued with cluster analysis using the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) method. Meanwhile, the number of clusters was determined iteratively from a combination of DBSCAN parameters (MinPts and Epsilon). The best method was evaluated based on the Silhouette Coefficient (SC) value, which in this case was 0.78 (MinPts 7 and Eps 1500) and included in the strong category. Subsequently, exploration was carried out by reducing the MinPts value and the lowest limit value of strong SC.
Green-AgNPs modified membrane for monitoring mercury ions in cosmetic sample using pre-concentration assisted voltammetry technique Fadillah, Ganjar; Inayatussholeha, Eka Nurdina; Hidayat, Rahmat
Indonesian Journal of Chemical Analysis (IJCA) Vol. 7 No. 1 (2024): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol7.iss1.art4

Abstract

The carcinogenic and teratogenic properties of mercury have driven the necessity for the development of highly sensitive methods capable of detecting even trace amounts of the element. In response to this need, an analysis technique has been established for mercury ions, employing preconcentration methods utilizing filter paper modified by silver nanoparticles (AgNPs) and 3-Amino propyl trimethoxy silane (APTMS). This method allows for the detection of mercury ions through the voltammetry technique, ensuring accurate and reliable results. Upon conducting analyses using this method, it was found that the tested cosmetic samples were free from Hg2+ ions, indicating the absence of mercury contamination in the cosmetics under investigation. The correlation coefficient derived from the graph of the analysis results stands at an impressive value of 0.9976, affirming the strong relationship between the measured concentrations and the actual mercury content. Additionally, the method demonstrates excellent sensitivity, as evidenced by the low limit of detection (LOD) value of 0.0483 mM and the limit of quantification (LOQ) value of 0.1611 mM.
Co-Authors ACHMAD FAUZAN Adriana, Hannura Annisa Fitria Bariklana, Muhammad Eti Artiningsih Octaviani Inayatussholeha, Eka Nurdina Indah Puspita Sari Khansa, Shefia Dhiya Pramudita Putri Kusuma, Pramudita Putri Rahmat Hidayat Sayekti Wahyuningsih Teguh Endah Saraswati Uswatul Chasanah, Uswatul