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All Journal Jurnal Tadris Kimiya Al-Kimia Konfigurasi : Jurnal Pendidikan Kimia dan Terapan Indonesian Journal of Chemical Science and Technology
Lazulva Lazulva
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology

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Pemanfaatan Limbah Kulit Buah Pinang (Areca chatecu L.) Sebagai Biosorben untuk Mengolah Logam Berat Pb (II) Lisa Utami; Lazulva Lazulva
Al-Kimia Vol 5 No 2 (2017): December
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v5i2.3524

Abstract

This research aims to investigate the utilization of the waste of Pinang Fruit peel as a biosorbent which function to process Pb (II) from contaminated water. The result showed that the absorbtion ability of Pb (II) was strongly influenced by the acidity of solution, contact duration and the initial concentration of the Pb (II) solution. The maximum absorbtion was 92,50% at pH 6, initial concentration of 50 ppm in 75 minutes contact time. FTIR spectral data indicated the presence of  amina, alcohol and carbonil groups. Isotherm Langmuir was at the maximum absorbtion of 0,877 mg/g.
PENERAPAN PROBLEM BASED LEARNING PADA PEMBELAJARAN KONSEP HIDROLISI GARAM UNTUK MENINGKATKAN HASIL BELAJAR SISWA Restu Desriyanti Desriyanti; Lazulva Lazulva
Jurnal Tadris Kimiya Vol 1, No 2 (2016)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jta.v1i2.1247

Abstract

Reduction of Heavy Metals Level in the Waste Water Using Phytoremediation Technique Azura Afrina; Lazulva Lazulva
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 1, No 1 (2018): Juli 2018
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v1i1.10594

Abstract

This research was carried out due to the existence of the waste heavy metals in the aquatic environment, which was very harmful to the sustainability of the environment. The purpose of this research was to find out the reduction percentage of copper metal (Cu) on the waste. This research using method phytoremediation test. The plants used were water hyacinth (Eichornia crassipes) and algae (Hydrilla verticilata). This study was conducted three times of the repetition in each variable. The measurement of Cu concentration using Atomic Absorption Spectroscopy (AAS) flame. The Results of this research was found that the efficiency of the average reduction in the concentration of Cu by water hyacinth was 82.8368% and the efficiency of the average reduction in the concentration of Cu by algae was 63.4042%.
Preparing of Cornstarch (Zea mays) Bioplastic Using ZnO Metal Nurwani Hayati; Lazulva Lazulva
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 1, No 1 (2018): Juli 2018
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v1i1.10595

Abstract

The manufacture of the bioplastic was done through the mixing process using an aquades solvent with a ratio massa 10 gram and 7 gram cornstarch, 150 mL aquades, 2 Ml glycerol and 0,5 gram ZnO. This study aim to find out physical characteristies (water vapour transmission rate, water content, thickness,biodegradation) and mechanical charateristics (tensile strength, elongasi, modulus young) are made of cornstrach (Zea mays) using ZnO metal. From the test results tensile strength was 2.744-4.018 Mpa, percentage of elongation was 28.4632.383%, modulus young’s was 8.9031026535-14.08617709Mpa, thickness was 0.16-0.29mm, water vapor transmission rate was 0.4329-1.52525g/m2.24 hours, water content was 13.5-14.5%, and biodegradation was 3.7798-7.0346% and 455-809 days.
STUDI KOMPARASI MODEL PEMBELAJARAN STAD DAN NHT TERHADAP HASIL BELAJAR SISWA PADA MATERI HIDROLISIS GARAM nais wulandari; lazulva lazulva
Konfigurasi : Jurnal Pendidikan Kimia dan Terapan Vol 5, No 1 (2021)
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/konfigurasi.v5i1.14033

Abstract

AbstractThis research was instigated by the implementation of chemistry learning that needed student-centered learning interactions by implementing Student Teams Achievement Division (STAD) and Numbered Heads Together (NHT) types of cooperative learning.  This research aimed at knowing the difference on learning achievement between students taught by using STAD model and those who were taught by using NHT model on Salt Hydrolysis lesson.  The eleventh-grade students of Natural Science at State Senior High School 1 Pasir Penyu in the Academic Year of 2018/2019 were the population of this research.  Purposive sampling technique was used in this research, and there were 33 students as the samples in experiment 1 and experiment 2 groups.  The research findings showed that the increase of learning achievement of students taught by using STAD model was 18.06, and the mean increase of learning achievement of students taught by using NHT model was 14.60.  Besides, based on the statistical analysis, it was obtained that there was a difference on learning achievement between students taught by using STAD model and those who were taught by using NHT model on Salt Hydrolysis lessonat State Senior High School 1 Pasir Penyu, tobserved was higher than ttable (2.063>1.997) and the score of sig was lower than 0.05, so H0 was rejected..Keywords: NHT, Salt Hydrolysis, STAD
Co-Authors Azura Afrina Lisa Utami nais wulandari Nurwani Hayati Restu Desriyanti Desriyanti