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Wijaya, Nanang Rahmat
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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ROBUST SPECTRAL MODEL FOR LOW METAL CONCENTRATION MEASUREMENT IN AQUEOUS SOLUTION REVEALS THE IMPORTANCE OF WATER ABSORBANCE BANDS Putra, Alfian; Wijaya, Nanang Rahmat
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6332

Abstract

ABSTRACT In this study, we focused on detection of metal ions at low concentration in aqueous solution by using NIRS. New “aquaphotomics” concept (Tsenkova, 2007) has become a powerful strategy to understand the spectral changes related to small concentration of solutes in aqueous solution. To improve the model accuracy it is important to understand why it is possible to detect the object of interest using NIRS. Although detectable, metals have no absorption in NIR region (Sakudo,et,al, 2007). However it is perhaps due to their vibrational modes that are modulated by forming complexes with organic molecules containing C-H, N-H and O-H bonds. Therefore, alteration of the vibrational mode of water matrix caused by metal can be detected by NIRS. In this study, we present NIR spectroscopy link to aquaphotomics as a tool to predict low concentration (0-10.mg L-1) of Mg(II), Zn(II), Mn(II) and Cd(II).Keywords : NIR spectroscopy, spectral changes, absorbance
Pembuatan Plastik Biodegradable dari Pati Singkong (Manihot esculenta) dan Cangkang Telur dengan Penambahan Gliserol sebagai Plasticizer Rahma, Miftahul; Dewi, Ratni; Wijaya, Nanang Rahmat; Sari, Ratna
Jurnal Teknologi Vol 25, No 3 (2025): Desember 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i3.8203

Abstract

The problem of conventional plastic waste, which if difficult to decompose process a serious threat to the environment. As a solution, this study aims to produce biodegradable plastic made from cassava starch (Manihot esculenta) and eggshell powder, with glycerol as a plasticizer.  The addition of eggshell powder is intended to improve the mechanical properties of the plastic. Samples were prepared using varying amounts of glycerol (2; 2.5; 3.5; 3; 3.5; 4 mL) and eggshell powder (0.3; 0.6; 0.9; 1.2; 1.5 grams). The plastic was tested for biodegradability, tensile strength, functional group analysis (FT-IR), and surface morphology (SEM). The result showed that the sample with 0.3 grams of eggshell powder and 4 mL of glycerol had the highest biodegradation rate (98.94% within two days). The highest tensile strength (22.99 MPa) was achieved with 1.5 grams of eggshell powder and 4 mL of glycerol. FT-IR analysis identified the presence of carbonate, hydroxyl, carbonyl, and ester groups, while SEM observations revealed a surface morphology that was not fully homogeneous due to uneven particle dispersion. Overall, the resulting plastic meets the Indonesian National Standard (SNI) 7818:2016, particularly in terms of biodegradability.
FORMULATION OF BAR SHAMPOO BASED ON Eucheuma cottonii SEAWEED EXTRACT WITH VARYING CONCENTRATIONS OF SODIUM COCOYL ISETHIONATE Hidayana, Acut Rahmatul; Ridwan, R; Wijaya, Nanang Rahmat
Jurnal Sains dan Teknologi Reaksi Vol 23, No 02 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i02.8858

Abstract

This study aims to formulate shampoo bars as an environmentally friendly alternative hair care product by utilizing nutrient-rich Eucheuma cottonii seaweed extract and varying the concentration of Sodium Cocoyl Isethionate (SCI) as a natural surfactant that does not irritate the scalp. The E. cottonii extract was obtained through maceration with 96% ethanol and concentrated using a rotary vacuum evaporator. The SCI concentrations used were 30%, 35%, 40%, 45%, and 50%, while the E. cottonii extract concentrations were 2%, 6%, 10%, 14%, and 18%. The physical quality of the shampoo bar was evaluated through acidity (pH) testing, moisture content, foam stability, organoleptic testing (color, aroma, texture), and irritation testing. The results showed that all formulations had a pH of 5.5–6.33, meeting SNI 06-2692-1992 standards. The highest moisture content was recorded at 16.96% in SCI 30% and 18% extract, while the lowest was 5.26% in SCI 50% and 2% extract. Foam stability increased with increasing SCI, with the highest foam stability percentage of 79.22% in SCI 50% and 2% exract. Organoleptic testing showed good acceptance of color and texture, with the aroma of some formulas slightly changing to be less fresh, but generally still acceptable to the panelists. Irritation testing on 25 panelists did not show any serious irritation, indicating the optimal quality of the shampoo bar produced.  Keywords: Eucheuma cottonii, Maceration, Physical Quality, Shampoo bar, Sodium Cocoyl Isethionate
Co-Authors Alfian Putra Dewi, Ratni Hidayana, Acut Rahmatul R Ridwan Rahma, Miftahul Ratna Sari