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All Journal JURNAL KIMIA SAINS DAN APLIKASI

Anis Kristiani

Research Center for Chemistry, National Research and Innovation Agency Republic of Indonesia (BRIN), Kawasan Puspiptek, Serpong, South Tangerang|National Research and Innovation Agency (BRIN)|Indonesia

Author-ID : 5275297

Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

Published : 3 Documents Claim Missing Document

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Articles

Functionalized Alkaline Lignin for Removal of Lead in Aqueous Solution Deliana Dahnum; Egi Agustian; Eka Triwahyuni; Anis Kristiani; Roni Maryana; Yanni Sudiyani
Jurnal Kimia Sains dan Aplikasi Vol 25, No 5 (2022): Volume 25 Issue 5 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Lignin, the second most abundant natural polymeric globally, is considered the source of the renewable aromatic compound. It serves as an alternative feedstock for the elaboration of chemicals and polymers. However, even until now, it is still primarily used as a low-value fuel for boilers. In the current research, alkaline lignin was modified and used as an adsorbent for removing lead (Pb) in an aqueous solution. The functionalized alkaline lignin (FAL) was prepared by a Mannich reaction with formaldehyde and dimethylamine, followed by esterification of carbon disulfide. The FAL was characterized using CHN elemental analysis, X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), and Fourier Transform Infrared (FT-IR) to observe the changes in composition, morphology, and chemical structure. The analysis revealed that alkaline lignin was successfully modified using amine and carbon disulfide. The adsorption study shows that the lead concentration reduced to 93.7% after 2 hours in contact with FAL. The FAL adsorption capacity could obtain 0.44 mmol/g of lead.

Catalytic Performance of Sulfonated Carbon Catalysts for Hydrolysis of Palm Oil Empty Fruit Bunch Anis Kristiani; Kiky Corneliasari Sembiring; Yosi Aristiawan; Fauzan Aulia; Luthfiana Nurul Hidayati; Haznan Abimanyu
Jurnal Kimia Sains dan Aplikasi Vol 23, No 6 (2020): Volume 23 Issue 6 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Utilizing lignocellulosic biomass into valuable products, such as chemicals and fuels, has attracted global interest. One of lignocellulosic biomass, palm oil empty fruit bunch (EFB), has major content of cellulose (30-40%), which is highly potential to be a raw material for fermentable sugar production. In this research, a series of sulfonated carbon catalysts with various concentrations of sulfuric acid (H2SO4, 10-30 v/v%) solutions have been successfully prepared and applied for a single stage of heterogeneous acid-catalyzed hydrolysis over microcrystalline cellulose and EFB under moderate temperature condition and ambient pressure. The catalysts’ physical and chemical properties were characterized by using a Thermogravimetric Analyzer (TGA), X-ray diffractometer, surface area analyzer, and Fourier-transform infrared spectrophotometer. The characterization results showed that sulfonated carbon had relatively similar physical properties with the parent of active carbon. The hydrolysis activity of sulfonated carbon catalysts gave various Total Reducing Sugar (TRS). The effects of sulfate loading amount in catalyst samples and various ionic liquids were investigated. The hydrolysis of pure microcrystalline cellulose powder (Avicel) using 30%-sulfonated carbon (30-SC) catalyst in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) ionic liquid at 150°C yielded the highest TRS of 16.11%. Subsequently, the catalyst of 30-SC was also tested for hydrolysis of EFB and produced the highest TRS of 40.76% in [BMIM]Cl ionic liquid at 150°C for 4 h. The obtained results highlight the potential of sulfonated carbon catalysts for hydrolysis of EFB into fermentable sugar as an intermediate product for ethanol production.

MgO-supported Ni-Sn Catalysts: Characterization and Catalytic Properties for Aqueous-phase Catalytic Reforming of Glycerol Kiky Corneliasari Sembiring; Anis Kristiani; Luthfiana Nurul Hidayati; Sudiyarmanto Sudiyarmanto; Fauzan Aulia; Asif Aunillah
Jurnal Kimia Sains dan Aplikasi Vol 24, No 6 (2021): Volume 24 Issue 6 Year 2021
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

The aqueous phase reforming (APR) of glycerol into value-added products, including H2 and alkanes, is environmentally green. In this work, the conversion of glycerol into syngas was demonstrated using MgO-supported Ni-Sn catalysts. Ni species is known for its capability of converting glycerol, but the activity towards water gas shift (WGS) reaction has not been satisfied. Loading Ni-Sn onto MgO has increased the catalyst basicity, which promotes a positive effect in WGS reaction. A series of bimetallic catalysts, impregnated Ni-Sn on MgO support, was prepared with various Ni-Sn loading amounts. To better understand the behavior of prepared catalysts, they were evaluated physio-chemically through XRD, BET, and FTIR. The catalytic activity test was performed for APR in a continuous flow reactor with aqueous glycerol 10 v-% as a feedstock at a reaction temperature of 250°C. As a result, the maximum hydrogen selectivity was obtained at about 73 v-%.

Co-Authors Asif Aunillah Deliana Dahnum Egi Agustian Eka Triwahyuni Fauzan Aulia Haznan Abimanyu Kiky Corneliasari Sembiring Kiky Corneliasari Sembiring Luthfiana Nurul Hidayati Luthfiana Nurul Hidayati Roni Maryana Sudiyarmanto Sudiyarmanto Yanni Sudiyani Yosi Aristiawan

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