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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmiah Arena Tekstil Journal of Physics: Theories and Applications ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat SEMAR Equilibrium Journal of Chemical Engineering Bulletin of Chemical Reaction Engineering & Catalysis
Hendri Widiyandari
Universitas Sebelas Maret
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Extraction of Silica (SiO2) from Rare-Earth Metal Zircon (ZrSiO4) as Lithium-Ion Battery Anode Material Putri Lestari; Rhiska Aria Berliani; Erlangga Aria Pratama; Ridwan Assabila Al-Jannata; Desy Vita Pratiwi; Hendri Widiyandari
Jurnal Kimia Sains dan Aplikasi Vol 26, No 3 (2023): Volume 26 Issue 3 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.3.79-84

Abstract

Zircon is a rare metal natural mineral composed of zirconia and silica. The silica content in zircon can be used as anode material for lithium-ion batteries because of the low cost and high theoretical capacity. Silica is obtained from the extraction process of zircon with 5M NaOH solution with aging time variation to determine the silica surface area. The SiO2/C composite was obtained from the solid state reaction process of a mixture of silica and graphite. The silica results obtained were tested for characteristics using X-ray diffraction (XRD), Surface area analyzer (SAA), and Scanning electron microscopy/Energy dispersive x-ray (SEM/EDX). Test the battery performance to find the number of cycles, capacity, voltage, and battery current using Cyclic voltammetry (CV) and Continuous discharging current (CDC) tests. The highest silica yield and optimal surface area were obtained at 24 hours aging time variation of 8,721 m2/g with percentages of O 36.48% and Si 18.04%, and battery performance test with the highest capacity of 222.7 mAh/g on silica aging time variation 18 hours.
Ag-TiO2 for Efficient Methylene Blue Photodegradation Under Visible Light Irradiation Widiyandari, Hendri; Nashir, Muhammad; Parasdila, Hanaiyah; Almas, Khanza Fadhilah; Suryana, Risa
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.19885

Abstract

Photocatalysis is one of the environmentally friendly methods for degrading down wastewater contamination. TiO2 as one of the photocatalyst material is claimed can enhance the photocatalytic activity much better, if the band gap energy is reduced. In order to reduce the bandgap energy of TiO2, the novel in this research is that the temperature variations over a 24-hour period at 100 °C, 120 °C, 140 °C, and 160 °C in hydrothermal process to synthesize the photocatalyst material with Ag-doped. Diffraction patterns of Ag-TiO2 show that all sample have tetragonal crystal structure and an anatase phase which also has excellent crystallinity. Some of the nanoparticles on the surface of Ag-TiO2 have a consistent morphology, while other particles are formed irregularly. According to the DRS UV-Vis result, bandgap energy reduced as temperature increased (Eg = 3.2 eV to 2.32 eV). The results from PL Ag-TiO2 160 have the lowest intensity, which indicates a low rate of electron-hole recombination. The Ag-TiO2 160 sample produced the best photocatalytic activity, according to the results of the MB degradation test, with a relative change in concentration of 92.98% for 2 h under visible light. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Microwave-assisted roasting time on Ilmenite Bangka Belitung extraction using hydrometallurgical method Mutakin, Ikbalul; Suryana, Risa; Septiani, Eka Lutfi; Arutanti, Osi; Widiyandari, Hendri
Journal of Physics: Theories and Applications Vol 8, No 1 (2024): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v8i1.90259

Abstract

Titanium Dioxide (TiO2) was extracted from Bangka Ilmenite through a hydrometallurgical process employing the microwave-assisted method using a 20% HCl solution. The highest crystallinity percentage in XRD result, reaching 75%, was achieved after a roasting duration of 25 minutes, with a corresponding crystallite size of  35.57 nm at the TiO2-Anatase phase's peak intensity of 25.24°. Analysis of the extracted ilmenite revealed alterations in its compound composition, notably an increase in TiO2 content. The most substantial increase in TiO2 content, rising to 69.7% from 33.76%, was observed after 25 minutes of roasting. UV–Vis spectroscopy revealed an energy band gap of 2.329 eV.
Edukasi Pengelolaan Sampah Organik di Yayasan Pendidikan Mutiara Insan Menuju Sekolah Berwawasan Mandiri Energi Kusumandari, Kusumandari; Suryana, Risa; Iriani, Yofentina; Nurosyid, Fahru; Widiyandari, Hendri; Khairuddin, Khairuddin
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 12, No 2 (2023): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v12i2.77098

Abstract

Sampah selalu menjadi permasalahan yang tak kunjung usai dan menjadi perhatian serius pemerintah Indonesia. Kesadaran masyarakat Indonesia dalam pengelolaan sampah masih harus terus ditingkatkan. Secara umum sampah dapat dikategorikan sebagai sampah organik dan non organik. Kedua jenis sampah tersebut sejatinya dapat dimanfaatkan lagi. Sebagai contoh dengan mendaur ulang sampah plastik menjadi barang-barang yang bermanfaat seperti vas bunga, pot, tempat pensil dan lain sebagainya Sedangkan sampah organik dapat dimanfaatkan untuk membuat pupuk kompos atau bahkan untuk sampah organik dalam jumlah banyak dapat dimanfaatkan sebagai sumber energi baru biogas. Oleh karenanya dalam usulan pengabdian ini, akan dilakukan edukasi pengelolaan sampah organik di Yayasan Pendidikan Mutiara Insan Sukoharjo. Yayasan Pendidikan Mutiara Insan membawahi beberapa institusi pendidikan yaitu SMPIT Mutiara Insan, SDIT Mutiara Insan dan TKIT/PAUD Mutiara Insan. Sebagai lembaga Pendidikan dengan kurikulum fullday, yayasan menerapkan kebijakan pemberian katering snack maupun makan siang setiap harinya. Selain berdampak positif, hal tersebut tentunya menimbulkan masalah karena banyaknya sampah organik yang berasal dari potongan sayuran maupun sisa makanan siswa. Berdasarkan latar belakang tersebut, maka diperlukan edukasi untuk membangun kesadaran pengelolaan sampah organik tersebut. Edukasi dengan pemberian materi in class tentang pengelolaan sampah menjadi energi alternatif biogas. Kegiatan diikuti oleh pemangku kebijakan dari Yayasan Mutiara Insan dan juga perwakilan pemerintah setempat. Dari hasil pelatihan, peserta merasa mendapatkan pencerahan mengenai sampah organik sebagai sumber energi alternatif dan siap mendukung penerapannya di Yayasan Mutiara Insan sebagai usaha mewujudkan sekolah yang berwawasan mandiir energi. Dari pengabdian ini diharapkan masyarakat mendapatkan kemanfaatan edukasi dan teknologi tepat guna dalam usaha pengelolaan sampah khususnya sampah organik. 
Training of Electric Bike Assembly with Lithium Batteries at SMK Muhammadiyah 6 Karanganyar Paramitha, Tika; Dyartanti, Endah Retno; Widiyandari, Hendri; Jumari, Arif; Nur, Adrian; Inayati, Inayati; Budiman, Anatta Wahyu; Purwanto, Agus
Equilibrium Journal of Chemical Engineering Vol 5, No 1 (2021): Volume 5, No 1 July 2021
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v5i1.53965

Abstract

With the increasing development of the battery and electric vehicle industry, student's and teacher's understanding of lithium batteries and skills in assembling electric bikes are very important in competing for jobs in these fields. Educational activities regarding batteries and training on assembling electric bike are carried out at SMK Muhammadiyah 6 Karanganyar, because there were no facilities that support the learning and teaching process about electric vehicles and batteries. The method used in this training is lecture, discussion and practice method. The material presented was about the technology of making lithium batteries and electric bike components. While practical activities include the stages of converting conventional bikes into electric bikes with energy from lithium batteries. This activity shows that participants can understand batteries and can apply batteries to electric vehicles, especially electric bikes.
Synthesis of Graphene from Pencils Graphite Via Electrochemical Exfoliation Method as a Cu-Foil Coating on the Anode-Free Lithium-Ion Battery Neka Nur Aida; Muhammad Ikhsanudin; Anif Jamaludin; Anafi Nur'aini; Eka Lutfi Septiani; Hendri Widiyandari
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 1 (2024): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.1.74620.31-37

Abstract

The Anode-free Li-ion Battery (AFLB) is an alternative to a new Li-ion battery model that offers high energy density at the same battery size as conventional models. Uncontrolled dendrite growth inactive the lithium deposition, resulting in decreased specific capacity, shortened lifecycle, and reduced coulombic efficiency. This work reported the utilization of graphene derived from pencil graphite for coating Cu foil as a current collector in AFLBs, to mitigate the formation of lithium dendrites and enhance battery capacity. The graphene-coated Cu foil exhibits a specific capacity of 143 mAh/g, representing a 20 mAh/g increase compared to batteries lacking a graphene coating. The coulombic efficiency of the battery with graphene coating in the charging and discharging process for three cycles is 84.53% in the 1st cycle, 101.44% in the 2nd cycle, and 98.58% in the 3rd cycle.
Sintesis Material Katoda LiNi0,8Mn0,1Co0,1O2 (NMC811) dengan Metode Solid State Menggunakan Nikel Hasil Perolehan Kembali dari Spent Nickel Catalyst Hendri Widiyandari; Rizqia Afifatu Latifah; Arif Jumari; Cornelius Satria Yudha; Shofirul Sholikhatun Nisa
ALCHEMY Jurnal Penelitian Kimia Vol 18, No 2 (2022): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.18.2.63035.214-220

Abstract

Penelitian mengenai sintesis material katoda LiNi0,8Mn0,1Co0,1O2 (NMC811) menggunakan nikel hasil perolehan kembali dari spent nickel catalyst telah berhasil dilakukan menggunakan metode solid state dengan variasi perbandingan padatan spent nickel catalyst/larutan (padatan/larutan) yang digunakan untuk leaching spent nickel catalyst sebesar (20 g/L, 30 g/L, dan 40 g/L). Proses leaching dilakukan menggunakan asam laktat 2 M selama 3 jam dengan suhu 80 ℃. Hasil dari proses ini adalah filtrat nikel laktat dengan endapan sebanyak 1,50 gram, 6,10 gram, dan 9,26 gram. Dalam filtrat tersebut terdapat ikatan hidroksida dan ikatan asam karboksilat. Material katoda NMC811 yang terbentuk memiliki enam puncak difraksi. Puncak difraksi X-ray tertinggi terdapat pada 2 theta 15° ‒ 20° dan 44°. Morfologi permukaan dari material katoda NMC811 menunjukkan terbentuknya partikel yang irregular dengan ukuran yang tidak seragam. Komposisi material katoda menunjukkan bahwa katoda NMC811 berhasil diperoleh dengan kandungan nikel sebanyak 73% ‒ 79%, mangan sebanyak 9% ‒ 13% dan kobalt sebanyak 10% ‒ 13%. Baterai lithium-ion yang dibuat menggunakan katoda NMC811 tersebut memiliki kapasitas masing-masing dengan variasi 20g/L sebesar 15,09 mAh/g, 30 g/L sebesar 28,42 mAh/g dan 40 g/L sebesar 25,57 mAh/g. Synthesis of LiNi0,8Mn0,1Co0,1O2 (NMC811) Cathode Material by Solid State Method Using Nickel Recovered from Spent Nickel Catalyst. Research on the synthesis of NMC811 cathode using nickel recovered from spent nickel catalyst was successfully carried out using the solid-state method with various ratios of solids spent nickel catalyst/solution used for leaching spent nickel catalyst (20 g/L, 30 g/L, and 40 g/L). The leaching process was carried out using 2 M lactic acid for 3 hours at a temperature of 80℃. The result of this process is lactic nickel filtrate with a precipitate of 1.50 grams, 6.10 grams, and 9.26 grams. There are hydroxide bonds and carboxylic bonds in the filtrate. The NMC811 cathode material formed has six diffraction peaks. The highest X-ray diffraction peak is at 2-theta of 15° ‒ 20° and 2-theta of 44°. The surface morphology of the NMC811 cathode material shows the formation of several lumps of non-uniform size. The composition of the cathode material shows that the NMC811 cathode has a nickel content of 73% ‒ 79%, manganese of 9% ‒ 13%, and cobalt of 10% ‒ 13%. The lithium-ion battery made using the NMC811 cathode has a capacity of 20g/L at 15.09 mAh/g, 30 g/L at 28.42 mAh/g, and 40 g/L at 25.57 mAh/g.
Sosialisasi dan Kinerja Pemasangan CCTV Berbasis Panel Surya sebagai Pengaman Lingkungan di Desa Triyagan, Jawa Tengah Agus Supriyanto; Risa Suryana; Fahru Nurosyid; Yofentina Iriani; Kusumandari Kusumandari; Hendri Widiyandari; Khairuddin Khairuddin; Dina Siti Nurmala; Galuh Anjani Kirana Dewi; Imevia Her Rekenalita; Karini Kayala Putri; Safitri Amalia Putri
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 14, No 2 (2025): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v14i2.109479

Abstract

Kegiatan sosialisasi kinerja Closed Circuit Television (CCTV) berbasis energi surya dilaksanakan di Desa Triyagan, kecamatan Mojolaban kabupaten Sukoharjo.  Kedgiatan ini sebagai upaya peningkatan keamanan lingkungan dengan teknologi yang efektif, efisien, dan ramah lingkungan. Tujuan utama kegiatan ini adalah memberikan pemahaman kepada masyarakat mengenai manfaat, cara kerja, dan keunggulan sistem CCTV yang menggunakan panel surya sebagai sumber energi utama. Teknologi ini memungkinkan sistem pengawasan lingkungan beroperasi secara mandiri tanpa ketergantungan terhadap pasokan listrik PLN.  Metode sosialisasi meliputi penyuluhan, demonstrasi langsung, dan diskusi interaktif bersama masyarakat dan aparat desa. Hasil kegiatan menunjukkan adanya peningkatan pengetahuan dan kesadaran masyarakat terhadap pentingnya penggunaan teknologi ramah lingkungan dalam menjaga keamanan desa. Program ini diharapkan menjadi model penerapan teknologi hijau untuk sistem keamanan lingkungan yang berkelanjutan di tingkat desa.
Pengembangan Energi Alternatif Biogas dari Sampah Organik di Desa Wonorejo Polokarto Sukoharjo Kusumandari Kusumandari; Risa Suryana; Yofentina Iriani; Fahru Nurosyid; Hendri Widiyandari; Khairuddin Khairuddin; Mohtar Yunianto; Mokhamad Sahid Praptomo
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 14, No 1 (2025): Mei
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v14i1.94019

Abstract

Permasalahan sampah di Indonesia menjadi perhatian serius pemerintah. Berbagai usaha pengelolaan sampah dilakukan untuk mengurangi penumpukan sampah. Salah satunya dengan pengelolaan sampah jenis organik menjadi sumber energi alternatif yaitu biogas. Dalam rangka kegiatan pengabdian kepada masyarakat, dilakukan pengolahan sampah organik menjadi energi alternatif Biogas. Kegiatan pengabdian dilakukan di Desa Wonorejo Polokarto Sukoharjo. Desa Wonorejo terdiri atas beberapa dukuh dengan total penduduk berjumlah 5783 orang. Selain rumah penduduk, di desa Wonorejo juga terdapat beberapa institusi Pendidikan mulai dari SD sampai SMA dan juga pondok pesantren dibawah Muhammadiyah. Oleh karenanya wilayah desa Wonorejo termasuk wilayah yang padat penduduk dengan beban sampah yang dihasilkan per hari yang cukup banyak. Sampah tersebut terdiri atas sampah organik dan non organik. Untuk sampah non organik warga dapat mengumpulkannya dan menjual ke pengepul sampah non organik. Tetapi untuk sampah organik, penduduk masih menghadapi kendala karena belum dapat mengolahnya menjadi sesuatu yang lebih bermanfaat. Oleh karenanya pengolahan limbah organik menjadi biogas menjadi salah satu alternatif untuk mengatasi masalah tersebut. Pengolahan dimulai dengan pembuatan biodigester sebagai reaktor tempat terbentuknya gas, kemudian pengisian dengan starter dan uji fungsional. Dari pengabdian ini diharapkan masyarakat mendapatkan kemanfaatan teknologi tepat guna untuk menunjang kehidupan dalam usaha pengelolaan sampah khususnya sampah organik.
Eco-Friendly Synthesis of ZnO/CQD Photocatalysts from Waste Milk for Myclobutanil Degradation under Visible Light Hendri Widiyandari; Orien Prilita; Hanaiyah Parasdila; Risa Suryana; Osi Arutanti
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20532

Abstract

Pesticides play a vital role in maintaining the global food supply amid rising agricultural demand and the adverse effects of climate change on crop productivity. Among them, myclobutanil, a triazole-based compound, is commonly used to safeguard plants against fungal diseases. The chemical compounds produced from the high toxicity, mobility, and persistence of pesticides in water can have harmful environmental effects. Food/organic waste has recently gained attention for its potential use in material research, one of them is stale milk. Stale milk contains lactic acid, which can be utilized as a carbon precursor for preparing carbon quantum dot (CQD). In this study, a ZnO/CQD composite photocatalyst was successfully synthesized using CQD derived from stale milk through a green hydrothermal method. The photocatalytic activity of ZnO/CQD in degrading the pesticide myclobutanil was confirmed after 120 min, achieving a degradation efficiency of 30% while ZnO only 18% under visible light, demonstrating its potential as an excellent photocatalyst candidate for the removal of organic pollutants. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Adrian Nur Adrian Nur AGUS PURWANTO Agus Subagio Agus Supriyanto Ahmas Sudin, Ahmas Alfi Nur Aini Almas, Khanza Fadhilah Anafi Nur'aini Anatta Wahyu Budiman Anif Jamaludin Aninda Artatriska Meilana Anisa Surya Wijareni Arif Jumari Arutanti, Osi Budiman, Anatta Wahyu Burhanudin Syam Cornelius Satria Yudha Cornelius Satria Yudha Cornelius Satria Yudha Desy Vita Pratiwi Dewi Ratnasari Didik Setyo Widodo Dina Siti Nurmala Eka Lutfi Septiani Endah Retno Dyartanti Endah Retno Dyartanti, Endah Retno Erlangga Aria Pratama Fahru Nurosyid Fahru Nurosyid Fahru Nurosyid Fahru Nurosyid Galuh Anjani Kirana Dewi Hanaiyah Parasdila Hanaiyah Parasdila Imevia Her Rekenalita Inayati Inayati Karini Kayala Putri Kasmiran Jumari Khairuddin - Khairuddin Khairuddin Khairuddin Khairuddin Khairul Anami Kusumandari Kusumandari Kusumandari Kusumandari Kusumandari Kusumandari Kusumandari, Kusumandari Linggar Tungga Gupita Luthfi Mufidatul Hasanah Luthfi Mufidatul Hasanah Metri Setyaningsih Mitha Dea Anggistia Mohtar Yunianto Muhammad Ikhsanudin Muhammad Nashir Musni Ahyani, Musni Mutakin, Ikbalul Neka Nur Aida Nurwijayanti Orien Prilita Osi Arutanti Parasdila, Hanaiyah Pardoyo Pardoyo Prisca Putri Elesta Putri Lestari Ratna Balgis Rhiska Aria Berliani Ridwan Assabila Al-Jannata Risa Suryana Risa Suryana Risa Suryana Risa Suryana Risa Suryana Rizqia Afifatu Latifah Safitri Amalia Putri Septiani, Eka Lutfi Shofirul Sholikhatun Nisa Soraya Ulfa Muzayanha Soraya Ulfa Muzayanha Tatang Wahyudi, Tatang Tika Paramitha Tika Paramitha Yayuk Astuti Yofentina Iriani Yofentina Iriani Yofentina Iriani Yofentina Iriani Zaenul Muhlisin