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All Journal Cendekia : Jurnal Pengabdian Masyarakat Journal of Herbal, Clinical and Pharmaceutical Science (HERCLIPS) Distilat: Jurnal Teknologi Separasi Jurnal Teknik Kimia dan Lingkungan
Dewi, Listiyana Candra
Unknown Affiliation
Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Social Sciences

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Pengaruh Konsentrasi PVA Terhadap Analisa Merkuri Menggunakan MEtode Spektrofotometer UV-Vis Dewi, Listiyana Candra
Journal of Herbal, Clinical and Pharmaceutical Science (HERCLIPS) Vol 1 No 01 (2019): HERCLIPS VOL 01 NO 01
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (211.833 KB) | DOI: 10.30587/herclips.v1i01.1012

Abstract

Not all mercury complex compounds can be stable for a long time. Some require additional stabilizers to keep mercury concentrations in the sample unchanged due to interference from outside factors such as measurement time, temperature, humidity, and light. One of the stabilizing compounds commonly used in the analysis of complex compounds is Polyvinyl Alcohol (PVA). Addition of certain substances in the sample solution will have an influence on the character of the sample solution. In this article we will discuss the effect of PVA concentration on the results of analysis of mercury iodide-rhodamine B complex using a UV-Vis spectrophotometer method. The research in this article is experimental. Measurements are made by changing the Hgcation2+ to anion [HgI4]2-. The anion was reacted with rhodamine B and PVA compounds with varying concentrations, then analyzed using a UV-Vis spectrophotometer. The presence of mercury in solution gives rise to new peaks in the wavelength range of 592-606 nm. The concentration of PVA added as a stabilizing agent affects the measurement results. The more concentrated PVA concentration is used, the lower the peak of the mercury iodide-Rhodamine B complex on the spectrum.
Sosialisasi Pemilihan Program Studi di Perguruan Tinggi kepada Siswa-Siswi SMA Al-Ma’hadul Islami Pasuruan Dewi, Listiyana Candra; Indis, Nadhifah Al
Cendekia : Jurnal Pengabdian Masyarakat Vol 6 No 1 (2024): Juni
Publisher : LPPM UNIVERSITAS ISLAM KADIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32503/cendekia.v6i1.5087

Abstract

Pemilihan program studi menjadi masalah bagi sebagian siswa-siswi SMA dan sederajat. Hal tersebut dikarenakan banyak dari mereka yang tidak mengetahui potensi, minat, dan bakat yang dimilikinya. Oleh karena itu calon mahasiswa memilih program studi berdasarkan keinginan dari orang tua, atau mengikuti trend dari teman-teman sebayanya. Karena pilihan tersebut tidak sesuai dengan passion, sebagian dari mereka mengalami putus kuliah atau pindah jurusan ditengah jalan. Tujuan dari kegiatan pengabdian adalah sosialisasi Pemilihan Program Studi di Perguruan Tinggi agar siswa-siswi mampu menentukan program studi yang dipilih sesuai dengan minat dan bakat yang mereka miliki. Kegiatan sosialisasi ini dimulai dengan membagikan kuisioner tentang seberapa yakinkah mereka terhadap jenis kecerdasan (potensi), minat, dan bakat, yang dimiliki, serta apakah mereka sudah memiliki pilihan program studi yang akan dituju? Hasil survei membuktikan bahwa nilai rata-rata kuisinoner 3,0 (kurang yakin). Kegiatan dilanjutkan dengan pemaparan materi dan diskusi. Diakhir acara, siswa-siswi diberikan kuisioner yang sama untuk dibawa pulang. Pengisian kuisioner kedua dilakukan setelah siswa-siswi berdiskusi dengan orang tua, guru BK (bimbingan konseling), dan dosen pendamping, agar mereka lebih yakin terhadap pilihan program studi yang sesuai dengan potensi, minat, dan bakat, yang mereka miliki. Hasil rata-rata kuisioner kedua meningkat menjadi 4,1 (yakin). Berdasarkan angka tersebut dapat disimpulkan bahwa kegiatan sosialisasi ini memberikan manfaat kepada siswa-siwi SMA Al-Ma’hadul Islami Pasuruan.
Optimization of Domestic Wastewater Treatment with Biological Aerated Filter (BAF) Method Based on Bioball Sa'diyah, Khalimatus; Iswara, Mochammad Agung Indra; Dewi, Listiyana Candra; Putri, Febby Anisa
Jurnal Teknik Kimia dan Lingkungan Vol. 8 No. 2 (2024): October 2024
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v8i2.5138

Abstract

Domestic wastewater treatment using Biological Aerated Filter (BAF) method based on bioball is a technological innovation that combines biological and physical processes to improve effluent quality. This study studied the use of a Biological Aerated Filter (BAF) modified with bioball media and variations in residence time to improve waste treatment efficiency and ensure effluent quality by established standards. The study consisted of four stages: preparation, seeding and acclimatization, use of Biological Aerated Filter (BAF), and analysis of the results. The prepared waste samples are domestic liquid waste from shopping centers that have known sample parameters as influential. Seeding and acclimatization are carried out in BAF reactors. Waste was treated through BAF with variable residence time, then analyzed by testing procedures based on \SNI 6989.72: 2009. The results showed that the bioball media in the BAF reactor were more effective than without media, showing a decrease in TDS (92% in 6 hours), TSS (86%), and an increase in COD and BOD efficiency. Effluent pH results are constant at 6-7 as per environmental standards. Obtaining higher process efficiency required a combination of wastewater treatment methods.
EKSTRAKSI PADAT-CAIR LIGNIN DARI JERAMI PADI DENGAN PENAMBAHAN NAOH 5% PADA SUHU DAN WAKTU TERTENTU Nugraha, Arya Duta Eka; Anggerta, Lintang Alivia; Dewi, Listiyana Candra; Sari, Diana Novita
DISTILAT: Jurnal Teknologi Separasi Vol. 11 No. 1 (2025): March 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/distilat.v11i1.6880

Abstract

Salah satu bahan alam yang memiliki potensi menjadi bahan baku pembuatan sunscreen alami adalah jerami padi. Jerami padi merupakan limbah dari pertanian padi yang melimpah di Indonesia. Secara umum, jerami padi biasanya digunakan sebagai pakan ternak dan sebagian lainnya dimanfaatkan sebagai bahan baku pembuatan pupuk kompos sementara sisanya dibakar untuk menghindari penumpukan sehingga berpotensi menyebabkan terjadinya global warming. Kandungan lignin pada jerami padi dapat di ekstrak dengan ekstraksi padat cair. Penelitian ini bertujuan untuk mendapatkan ekstrak lignin yang terbaik dari nilai %yield dengan proses ekstraksi padat cair. Metode proses ekstraksi padat – cair jerami padi menggunakan sokletasi dan pelarut etanol 95% dengan sampel jerami padi yang digunakan sebesar 15 g ; 25 g ; 30 g dan proses hidrolisis dengan NaOH 5% didapatkan % yield lignin sebesar 0,25 % ; 21,21 % ; 17,97 % dengan %yield terbaik adalah pada sampel jerami 25 gram dengan hasil % yield sebesar 21,21 %.
Optimization of Operating Conditions in Lignin Isolation Process of Rice Straw Using Box-Behnken Design Methodology Anggerta, Lintang Alivia; Dewi, Listiyana Candra
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.6886

Abstract

Exposure to sunlight causes ultraviolet (UV) radiation, which can damage the body cells. Those negative effects can be prevented by using sunscreen, which contains lignin. Lignin has been proven to absorb or reflect      UV radiation effectively. Rice straw was being used as a non-synthetic active ingredient in sunscreen production. This research shows that during the operating conditions of the isolation process, several variables affect yield production, such as the mass of rice straw, temperature and time of isolation. Therefore, this research was carried out to optimize the lignin isolation process using the Box-Behnken Design (BBD) methodology.  Rice straw dregs that have undergone sample preparation were subsequently isolated through hydrolysis using 5% (w/v) NaOH. After that, the product was carried out to the next process, namely acidification, which used 72% (v/v) H2SO4. The resulting precipitate was then filtered and dried in an oven. Subsequently, the fiber content of the product was analyzed using the Van Soest analysis method, while the process conditions were evaluated using the BBD methodology. In this research, the highest lignin yield obtained was 17.04%, and the optimal process conditions used were 30 g mass of straw, 140°C, and 3 hours reaction time.
Co-Authors Anggerta, Lintang Alivia Diana Novita Sari, Diana Novita Indis, Nadhifah Al Iswara, Mochammad Agung Indra Nugraha, Arya Duta Eka Putri, Febby Anisa Sa'diyah, Khalimatus