Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Alotrop Jurnal Pendidikan dan Ilmu Kimia
Renaldi Adriansyah
Universitas Bengkulu
Chemistry Education

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
BIOSORPSI ION LOGAM BERAT Cu(II) DAN Cr(VI) MENGGUNAKAN BIOSORBEN KULIT KOPI TERXANTHASI Renaldi Adriansyah; Elyn Novta Restiasih; Nessi Meileza
ALOTROP Vol 2, No 2 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i2.7478

Abstract

There are several methods that have been used to remove and reduce the contamination of heavy metal ions.Among theseveral methods, biosorpsi is a cheap and high efficiency method. One of the organic materials that have potential to become heavy metal ion biosorbent was coffee skin.However, to improve the performance of coffee skin in adsorption of  heavy metal ions Cu (II) and Cr (VI) then biosorbent need to be modified through xanthation process.This xanthation process carried out by reacting the coffee skin with carbon disulfide compounds in an alkaline condition.This study aims to determine the ability of xanthated  coffe  skin biosorbentin adsorption of  Cu (II) and Cr (VI) metal ions and to know the optimum condition of the metal ion adsorption process byxanthated  coffe  skin biosorbent. From this research we got the optimum mass of Cu (II) and Cr (VI) metal ion adsorption of 0.45 and 0.6 gram. The optimum pH of Cu(II) and Cr(VI) metal ions adsorption occurs at pH 4.While the optimum contact time occurs at 100 minutes for Cu (II )metal ion adsorption  and 80 minutes for Cr (VI) metal ion adsorption. In addition, the maximum biosorption capacity of xanthated coffeskin biosorbent in adsorption of Cu (II) and Cr(VI) metal ions respectively 62.5 mg/g and 8.064 mg/g.  So it can be concluded that xanthated  coffe  skin biosorbenthave a better ability to adsorb Cu (II) metal ions than Cr (VI) metal ions.
ANALISIS Hg2+ DENGAN MENGGUNAKAN NANOPARTIKEL PERAK (NPP) SEBAGAI INDIKATOR KOLORIMETRI DENGAN METODE SPEKTROFOTOMETRI Renaldi Adriansyah; M. Lutfi Firdaus; Elvinawati Elvinawati
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3539

Abstract

[ANALYSIS OF Hg2+ USING NANOPARTIKEL METAL (NPP) AS A COLORIMETRY INDICATOR WITH SPECTRUMFOTOMETRY METHOD]. Mercury (Hg) is heavy metal with high toxicity that often pollutes the aquatic environment. Concentration of Hg (II) ions is usually determined by using ICP-MS and AAS but because its price relatively expensive an alternative is needed to determine concentration of Hg. Therefore, the purpose of the study was to conduct synthesis of silver nanoparticles (NPP) by utilizing extract of Phyllanthus acidus ceremin fruit as a colorimetric indicator for alternative analysis concentration of Hg metal in digital image. Bio NPP used as a colorimetric indikator of Hg metal in this study was synthesized at optimum condition. The optimum condition of Bio NPP synthesis was obtained on the ratio of extract volume of P. acidus  fruit and AgNO3 1: 1 and the duration of exposure to sunlight for 1 hour.The formed Bio NPP knew to be selective against Hg (II) metal ions characterized by the change of Bio NPP color from brownish yellow to clear. In addition, the Bio NPP that has been synthesized  in this study can be used as a colorimetric indicator of Hg metal analysis using spectrofotometer uv-vis with detection limit  7.56 ppb.  
Co-Authors Elvinawati Elvinawati Elyn Novta Restiasih M. Lutfi Firdaus Nessi Meileza