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All Journal International Journal of Renewable Energy Development Jurnal Pengajaran MIPA Jurnal Penelitian Hasil Hutan Chemistry in Education Jurnal Geologi dan Sumberdaya Mineral JKPK (Jurnal Kimia dan Pendidikan Kimia) ALKIMIA : Jurnal Ilmu Kimia dan Terapan el hayah jurnal studi islam
Buchari Buchari
Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Social Sciences

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KARAKTERISASI STRUKTUR NANO KARBON DARI LIGNOSELLULOSA Pari, Gustan; Santoso, Adi; Hendra, Djeni; Buchari, Buchari; Maddu, Akhirudin; Rachmat, Mamat; Harsini, Muji; Heryanto, Teddi; Darmawan, Saptadi
Jurnal Penelitian Hasil Hutan Vol 31, No 1 (2013):
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

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Abstract

Perkembangan ilmu pengetahuan abad ini dan yang akan datang sudah memasuki teknologi nano. Di bidang hasil hutan, teknologi nano yang dapat dikembangkan di antaranya adalah nano karbon dari bahan berlignoselulosa. Tujuan penelitian ini adalah menyediakan informasi dan teknologi pengolahan arang sebagai bahan baku nano karbon dari bahan lignoselulosa. Bahan baku lignoselulosa yang digunakan dalam penelitian ini adalah kayu jati, dan bambu yang dikarbonisasi pada suhu 400-500°C menggunakan kiln drum, arang yang dihasilkan dimurnikan dengan jalan dipanaskan pada suhu 800°C selama 60 menit yang sebelumnya didoping dengan logam Zn, Ni dan Cu. selanjutnya dihaluskan menggunakan high energy mechanic (HEM) selama 48 jam. Arang dengan kristalinitas tinggi disintering menggunakan spark plasma pada suhu 1.300°C. Karbon yang dihasilkan diuji sktuktur dan sifatnya menggunakan Py-GCMS, SEM-EDX, XRD,dan sifat elektrik. Hasil penelitian menunjukkan struktur karbon yang terbaik dihasilkan dari arang jati yang dikarbonisasi pada suhu 800°C yang didoping dengan atom Ni pada perbandingan 1:5 yang menghasilkan derajat kristalinitas sebesar 78,98% resistensi (R) 0,17Ω, konduktivitas 175,52 Ω-1m-1. Kualitas nano karbon setelah disintering derajat kristalinitasnya menjadi 81,87%, resistensi (R) 0,01Ω, dan konduktivitasnya sebesar 1067,26 Ω-1m-1. Nano karbon yang dihasilkan dapat dibuat sebagai biosensor, biobatere dan bioelektroda. Sehingga diperlukan penelitian lebih lanjut.
Pemisahan Unsur Tanah Jarang ( Ce, La, dan Gd ) dengan Metode Solvent Impregnated Resin menggunakan 1-fenil-3-metil-4-benzoil-5-pirazolon Rohiman, Asep; Buchari, Buchari
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 4 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Indonesia merupakan salah satu negara di dunia yang kaya sumber daya mineralnya, termasuk unsur logam tanah jarang. Sayangnya, teknologi untuk memurnikan unsur tanah jarang tersebut belum mumpuni. Salah satu teknologi terbaru saat ini dalam bidang pemisahan adalah dengan teknik mengimpregnasikan senyawa ekstraktan terhadap resin, yang dikenal dengan metode SIR. Senyawa pirazolon dan turunannya diketahui dapat digunakan untuk mengekstrak sejumlah ion logam salah satunya adalah ion logam tanah jarang. Pada penelitian ini, senyawa HPMBP telah berhasil disintesis. Senyawa tersebut digunakan sebagai ekstraktan untuk mengekstraksi ion logam tanah jarang dengan menggunakan metode SIR. Untuk menentukan kemurnian dan kesesuaian dengan yang diharapkan maka dilakukan karakterisasi baik secara fisik maupun kimiawi terhadap senyawa hasil sintesis tersebut yang meliputi: uji titik leleh, TLC, HPLC, karakterisasi gugus fungsi dengan spektroskopi IR, dan NMR. Tahap berikutnya yaitu penyiapan SIR yang dilakukan dengan cara mengamobilkan senyawa HPMBP pada  Amberlite XAD-16. Rasio berat HPMBP terhadap XAD-16  yang dapat diamobilkan yaitu 3 : 2. Selanjutnya, produk SIR tersebut digunakan untuk ekstraksi La+3, Ce+3, dan Gd+3 dalam media HNO3 0,1 M sebagai fasa air dengan cara batch. Kondisi pH optimum untuk ekstraksi La+3, Ce+3, dan Gd+3 secara berurutan diperoleh pada  pH = 3,1 ; pH = 2,19 dan pH = 1,70.
The Effect of pH and Concentration of KNO3 Solution to the Performance of Nd3+ Ion Selective Electrode Using HPMBP Ionophore Sosidi, Husain; Buchari, Buchari; Noviandri, Indra
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 3, No 3 (2018): JKPK( Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (764.7 KB) | DOI: 10.20961/jkpk.v3i3.22732

Abstract

The phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) synthesized and characterized as ionophore in potentiometric analysis of ion selective electrode method (ISE) with polytetrafluoroethylene (PTFE) as the supporting phase. The pH and concentration of the ionic strength adjuster (ISA) were varied to know at the optimum pH and concentration of the ion-selective electrode (ESI) KNO3, thus potential Nd3+ gives the best performance. Before use the PTFE membrane was immersed in a chloroform-HPMBP solution of 1.5-2.0% w/v for 24 h. The pH variation of the buffer solution was adjusted to the pH range of 2-10 using HCl and NaOH solutions, whereas the concentration of KNO3 varies from 10-1 to 10-3 M. The concentration range of Nd3+ is between 10-2 and 10-7 M. The electrode potential measurement results (ENd) obtained the best performance value at pH 4 with KNO3 concentration of 10-2 M, sensitivity (S) 18.39 ± 1.2 mV/decade and response time less than 23 s.
PENGEMBANGAN DAN VALIDASI ASESMEN KINERJA DALAM PROYEK MODIFIKASI ALAT PRAKTIKUM KIMIA INSTRUMEN Diawati, Chansyanah; Liliasari, Liliasari; Setiabudi, Agus; Buchari, Buchari
Chemistry in Education Vol 6 No 2 (2017): Terbit Bulan Oktober 2017
Publisher : Chemistry in Education

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Abstract

Penelitian ini bertujuan untuk mengembangkan dan memvalidasi instrumen asesmen kinerja yang dirancang untuk mengukur keterampilan berpikir kreatif mahasiswa calon guru kimia dalam pembelajaran berbasis proyek modifikasi alat praktikum (PBPMAP). Instrumen yang dikembangkan terdiri dari asesmen kinerja produk lembar kerja mahasiswa (LKM), serta asesmen kinerja proses ujicoba alat spektrofotometer sinar tampak (SST) dan spektrofotometer serapan atom (SSA) hasil modifikasi. Butir task disusun berdasarkan indikator keterampilan berpikir kreatif  framework Torrance. Rancangan awal instrumen dikonsultasikan kepada tiga orang ahli berdasarkan tujuan pembelajaran. Instrumen kemudian divalidasi oleh tiga orang ahli di bidang pendidikan kimia. Ujicoba instrumen dilakukan pada mahasiswa tahun ketiga di Program Studi Pendidikan Kimia Provinsi Lampung (N = 35). LKM dan video rekaman ujicoba alat dari salah satu kelompok mahasiswa dinilai oleh tiga orang rater. Skor dari ketiga rater kemudian dianalisis menggunakan Two-Way Anova. Hasil penelitian menunjukkan bahwa korelasi intra-kelas instrumen asesmen kinerja ini adalah memadai (ICC = 0,792). Hal ini menunjukkan bahwa instrumen reliabel dan dapat digunakan untuk mengukur kinerja keterampilan berpikir kreatif mahasiswa. This study aimed to developed and validate the performance assessment instrument designed to measure creative thinking skills of undergraduate pre-service chemistry teacher in project-based learning lab apparatus modification of chemistry of instruments. The instrument was developed consisting of the assessment of product performance, i.e. the student worksheet; and process performance assessment of testing apparatus modified of visible spectrophotometer and atomic absorption spectrophotometer. Task item arranged based on creative thinking skill indicators Torrance?s framework. A preliminary draft of instrument consulted to three experts based on learning objectives. Instruments were validated by three experts in the field of chemical education. The instrument tested to the third year student in Program Studi Pendidikan Kimia Provinsi Lampung (N = 35). Student worksheet and video of testing apparatus modified from one group of students rated by three raters, then analyzed by Two-Way Anova. The results showed that the consistency intra-class correlation  performance assessment instrument is adequate (ICC = 0.792). This results shows that the instrument reliable and can be used to measure the performance of students creative thinking skills.
A New Method of Bio-Catalytic Surface Modification for Microbial Desalination Cell Mardiana, Ummy; Innocent, Christophe; Cretin, Marc; Buchari, Buchari
International Journal of Renewable Energy Development Vol 10, No 2 (2021): May 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.34235

Abstract

A microbial desalination cell (MDC) built on a modified surface has been studied for seawater desalination. The goal of this study is to provide and develop a seawater desalination system that does not require energy support by applying a modification of the anode as an electron acceptor. The different potential charges that occur between anode and cathode can serve as the driving force for electrodialysis of seawater, resulting in its desalination. Yeast has been applied as a biocatalyst and neutral red has been chosen as a redox mediator to facilitate the electron transport originating from the bioactivity of cells. Several types of surface modification have been conducted, i.e., biocatalyst-mediator immobilisation and electropolymerisation of neutral red at the anode surface. The optimisation of each device has been characterised by cyclic voltammetry and chronoamperometry. It has also been observed in a microbial fuel cell (MFC), prior to being functioned in the MDC. The concentrations of salt ion migration have been determined by ion exchange chromatography. This study found that the best configuration of a modified surface was obtained from carbon felt coated by polyneutral red film (CF/PNR); this generated the maximum value of all tested parameters: 42.2% of current efficiency; 27.11% of bio-devices efficiency; 92.5 mA m-2 of current density; and 61% of NaCl transport. Moreover, the modified surface could be a promising method for improving anode performance.
PENGARUH PEMBELAJARAN MPBL-ITPAC TERHADAP KETERAMPILAN BERPIKIR KRITIS DAN BERKOMUNIKASI ILMIAH Hernani, Hernani; Permanasari, Anna; Buchari, Buchari; Hendayana, Sumar
Jurnal Pengajaran MIPA Vol 15, No 2 (2010): JPMIPA: Volume 15, Issue 2, 2010
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v15i2.35999

Abstract

This study aims to determine how influence of modified problem-based learning by Integrated Theory and Practical Analytical Chemistry (MPBL-ITPAC) to critical thinking and scientific communication skills. This research is part of a research and educational development, R D, which uses a quasi experimental method. The program was arranged and implemented on using 45 students of an experimental class, compared with 41 students as a controlled class. The research instrument used was multiple choice test with 5 options to assess critical thinking skills, and written essay test to assess scientific communication skills, in addition to observation sheet was used as supporting instrument to evaluate the development of oral communication skills. The results shows that: (1) In general, the achievement of critical thinking is 52.2% for experimental class, while controlled class is 32.7%, both values differ significantly, (2) In all sub critical thinking skills which includes identifying the criteria answers correct, identify the reasons stated, identifying relevany irrelevancy, using the existing procedure, consider the alternative, giving reasons, making hypotheses, the selection criteria to create solutions, and propose an alternative that allows the achievement of experimental class was significantly higher than control class, (3) the achievement of communication skills is 52.9% for experimental class and 29.2% for controlled class, both values differ significantly, (4) In sub-skills of communication in the form logical argue, put forward the hypothesis, put forward the necessary data types, considerations to take conclusions, and describes the schema tool, experimental class achievement significantly higher than the control class, and (5) development of oral communication skills of students increased at every stage in its path.
Pengembangan dan Validasi Asesmen Kinerja Dalam Proyek Modifikasi Alat Praktikum Kimia Instrumen Diawati, Chansyanah; Liliasari, Liliasari; Setiabudi, Agus; Buchari, Buchari
Chemistry in Education Vol 6 No 2 (2017): Terbit bulan Oktober 2017
Publisher : Universitas Negeri Semarang

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Abstract

Penelitian ini bertujuan untuk mengembangkan dan memvalidasi instrumen asesmen kinerja yang dirancang untuk mengukur keterampilan berpikir kreatif mahasiswa calon guru kimia dalam pembelajaran berbasis proyek modifikasi alat praktikum (PBPMAP). Instrumen yang dikembangkan terdiri dari asesmen kinerja produk lembar kerja mahasiswa (LKM), serta asesmen kinerja proses ujicoba alat spektrofotometer sinar tampak (SST) dan spektrofotometer serapan atom (SSA) hasil modifikasi. Butir task disusun berdasarkan indikator keterampilan berpikir kreatif framework Torrance. Rancangan awal instrumen dikonsultasikan kepada tiga orang ahli berdasarkan tujuan pembelajaran. Instrumen kemudian divalidasi oleh tiga orang ahli di bidang pendidikan kimia. Ujicoba instrumen dilakukan pada mahasiswa tahun ketiga di Program Studi Pendidikan Kimia Provinsi Lampung (N = 35). LKM dan video rekaman ujicoba alat dari salah satu kelompok mahasiswa dinilai oleh tiga orang rater. Skor dari ketiga rater kemudian dianalisis menggunakan Two-Way Anova. Hasil penelitian menunjukkan bahwa korelasi intra-kelas instrumen asesmen kinerja ini adalah memadai (ICC = 0,792). Hal ini menunjukkan bahwa instrumen reliabel dan dapat digunakan untuk mengukur kinerja keterampilan berpikir kreatif mahasiswa. This study aimed to developed and validate the performance assessment instrument designed to measure creative thinking skills of undergraduate pre-service chemistry teacher in project-based learning lab apparatus modification of chemistry of instruments. The instrument was developed consisting of the assessment of product performance, i.e. the student worksheet; and process performance assessment of testing apparatus modified of visible spectrophotometer and atomic absorption spectrophotometer. Task item arranged based on creative thinking skill indicators Torrance’s framework. A preliminary draft of instrument consulted to three experts based on learning objectives. Instruments were validated by three experts in the field of chemical education. The instrument tested to the third year student in Program Studi Pendidikan Kimia Provinsi Lampung (N = 35). Student worksheet and video of testing apparatus modified from one group of students rated by three raters, then analyzed by Two-Way Anova. The results showed that the consistency intra-class correlation performance assessment instrument is adequate (ICC = 0.792). This results shows that the instrument reliable and can be used to measure the performance of students creative thinking skills.
MANAJEMEN PEMBELAJARAN KETERAMPILAN BERBAHASA ARAB DENGAN METODE ROLE PLAYING BAGI SANTRI KELAS IV KMI PONDOK PESANTREN AL IMAN WONOGIRI Buchari, Buchari
EL-HAYAH : JURNAL STUDI ISLAM Vol 8, No 1 (2018): Juni 2018
Publisher : Pascasarjana UIN Raden Mas Said Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1903/elha.v8i1.4732

Abstract

Abstract : Research background reveals about speaking Arabic is important and must be mastered fluently by all students in Islamic Boarding School. This research aims at determining: 1) the planning of learning Arabic using role playing method at Islamic Boarding School Al Imam Wonogiri; 2) the implementation of learning  Arabic using role playing method at Islamic Boarding School Al Imam Wonogiri; 3) the evaluation of learning Arabic using role playing method at Islamic Boarding School Al Imam Wonogiri; 4) the development of learning Arabic using role playing method at Islamic Boarding School Al Imam Wonogiri.This research was descriptive qualitative. It was conducted at Islamic Boarding School of Al Iman Wonogiri. Informants of this research were Arabic teachers of Islamic Boarding School of Al Iman Wonogiri, especially 4th grades KMI and the Principal. Technique of collecting data used interview, observation, and documentation. Technique of data validity applied triangulation of source and method. Technique of data analysis used interactive model, including data collection, data reduction, data display and conclusion. The results of this research show that: 1) the planning of learning Arabic is done by summarizing purpose and objective of learning, choosing and determining learning subject, and also determining learning source or learning media; 2) the implementation of learning Arabic using Role Playing covering: the teachers create a group to practice role playing, explain learning theme to play role, give chances for students to discuss, monitor the students playing role, appreciate and evaluate learning activities. However, the teachers must be competent in their field; 3) the evaluation of learning Arabic using Role Playing is based on the following criteria: ability in speaking, writing, and mastering language formula, vocabulary, grammar, dialect, fluent speaking, carefulness in speaking and writing. The students should join test, assignment, housework or practice.       Keywords: Arabic learning, and Islamic Boarding School Al Iman Wonogiri
Platinum and Cobalt hydroxide – modified Platinum Electrode as Sensor for Electrochemical Oxidation of Amoxicillin Herlina, Herlina; Zulfikar, Muhammad Ali; Sirumapea, Lasmaryna; Buchari, Buchari
ALKIMIA Vol 6 No 1 (2022): ALKIMIA
Publisher : SCIENCE AND TECHNOLOGY FACULTY OF UNIVERSITAS ISLAM NEGERI RADEN FATAH PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (980.786 KB) | DOI: 10.19109/alkimia.v6i1.12014

Abstract

Antibiotics have recently gained in popularity due to their usage in medical treatment and the process of removing them from the environment. Amoxicillin is one of the antibiotics that constitutes the study's subject. On a Pt disc electrode and a cobalt hydroxide modified-Pt electrode, the scan rate and pH in the electrochemical oxidation of amoxicillin were investigated. The voltammetry measurement's current peak revealed that changing the electrode surface could increase the electrochemical response and sensitivity of the working electrodes. The Pt/Co(OH)2 modification working electrode had a high sensitivity in the electro-oxidation determination of amoxicillin, with a linear range of the sensor of 20 to 80 M and a limit of detection of 7.15 M for the Pt disc electrode and 3.64 M for the cobalt hydroxide modified Pt electrode. The findings of determination in real samples with electro-oxidation using a modified electrode were in good agreement with a confidence level of 95 percent, according to the comparing method with HPLC.
Co-Authors A.A. Ketut Agung Cahyawan W Agus Setiabudi Akhirudin Maddu Anna Permanasari Asep Rohiman, Asep Chansyanah Diawati Cretin, Marc Didin Mujahidin Djeni Hendra Gustan Pari Herlina H HERNANI - Husain Sosidi Indra Noviandri Innocent, Christophe Lasmaryna Sirumapea Liliasari , Mamat Rachmat Mr Sumar Hendayana Muhammad Ali Zulfikar Muji Harsini Pirim Setiarso Saptadi DARMAWAN Teddi Heryanto Ummy Mardiana, Ummy