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All Journal Jurnal Teknologi Journal of Vocational Studies on Applied Research
Adelina, Dina
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering

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Effect of Sodium Hydroxide Treatment on Adsorption of Methylene Blue Based on Cellulose Nano Crystals Mustikaningrum, Mega; Adelina, Dina; Indrawati Sawali, Fikrah Dian; Afandy, Moh Azhar
Journal of Vocational Studies on Applied Research Volume 6, Issue 1, Year 2024 (April 2024)
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v6i1.22505

Abstract

Methylene blue is one of the dye wastes that dissolve in the aquatic environment that cannot be directly degraded by the environment. If the quantity of this waste is large, it will become a compound that is toxic to the aquatic environment. One of the modern methods used to process this dye waste is adsorption. The adsorption method is a method of binding compounds with the help of adsorbents. One of the renewable adsorbent technologies comes from cellulose. Cellulose is often used because it has active groups that are quite effective in binding certain compounds. In this study, cellulose IV was produced, called nano cellulose crystals. Cellulose generally consists of amorphous and crystalline parts. The cellulose produced is hydrolyzed with sulfuric acid to remove the amorphous part so that only crystalline cellulose is obtained, followed by the help of ultrasonic waves to break the size into a nano form which is expected to have a large surface area. As a result of the hydrolysis stage, the nano cellulose crystals produced have sulfate groups that can bind methylene blue which when dissolved in water becomes cationic. This force is called electrostatic force. Some important stages of cellulose nanocrystal production are alkaline treatment, bleaching, hydrolysis, sonication, and freeze-drying. This study focuses on the effect of NaOH concentration used in alkaline treatment. NaOH in this case functions to dissolve impurities such as hemicellulose and lignin in a biomass. Removal of hemicellulose and lignin greatly affects the yield of cellulose produced. Based on the results of the study using 3,4, and 5% NaOH produced cellulose percentages of 38.7121; 39.7949, and 39.9138%, respectively. Cellulose content ultimately affects the number of active groups that bind methylene blue. The adsorption study evidences this obtained the percentage of removal at each concentration of 67.685; 70.837 and 71.823%. Another objective of this study was also to get the constant value of the extraction rate at each NaOH concentration used in the adsorption process. The values obtained were 0.0029; 0.0032 and 0.0039 m/minute at each NaOH concentration used during the alkaline treatment process.
Tannin Test on Celery Leaves (Apium graveolens L.) Using UV-Vis Spectrophotometry Method as an Active Ingredient in Hand Sanitizer Adelina, Dina; Adlin, Irman Ansari; S, Agustina Dyah; Junita, Rusnia
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.6845

Abstract

This study looks into whether celery leaves (Apium graveolens L.) could be used as a source of tannins for making hand sanitizer. This study attempts to find a natural antibacterial agent that can be used instead of hand sanitizers, which are in high demand during the COVID-19 pandemic. The goal was to measure the amount of tannins in celery leaves and see how well they work in hand sanitizers. We used the UV-Vis spectrophotometry approach to find out how much tannin there was, using quercetin as a benchmark. We used maceration with 96% ethanol to get the tannins out, and then we distilled them. The results showed that there was a strong linear association between absorbance and tannin concentration. The average tannin content was 0.1397 mg/g. Then, the celery leaf extract was added to hand sanitizer gels. Successful organoleptic testing showed that the composition was physically stable and had antibacterial properties. This study shows how to use local plant materials, such celery leaves, to make hand sanitizers that are good for the environment and work well. This is a better option than chemical-based solutions. The results show that this method could work on other plants with similar traits.
Pengolahan Limbah Cair Industri Beauty dan Personal Care Menggunakan Metode Koagulasi dan Flokulasi Hakim, Rusnia Junita; Adelina, Dina; Ismet, Rhahmasari; Muttaqim, Maulana
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7018

Abstract

The beauty and personal care industry generates wastewater that poses a potential threat to the environment if not properly treated. As a small-scale industry, there is a need for an efficient wastewater treatment technology that requires minimal cost and land area. This study aims to analyze the characteristics of wastewater from the industry and evaluate the effectiveness of coagulation and flocculation processes in reducing pollutant levels. The jar test method was employed using varying doses of coagulant (PAC) and flocculant (anionic polymer) at concentrations of 60, 80, and 100 ppm for PAC, and 1–3 ppm for the polymer. Initial test results indicated that the parameters for TDS, TSS, pH, EC, and turbidity did not meet the effluent quality standards set by the Indonesian Ministry of Environment Regulation No. 5 of 2014. The optimum dosage was found to be 80 ppm PAC combined with 3 ppm anionic polymer, which reduced TSS from 1482 mg/L to 83 mg/L and turbidity from 3120 NTU to 20 NTU. The best reduction in EC was achieved with 100 ppm PAC and 3 ppm polymer, lowering EC from 3210 µS/cm to 399 µS/cm. All parameters, except for TDS, complied with the established effluent quality standards.
Co-Authors Adlin, Irman Ansari Fikrah Dian Indrawati Sawali Hakim, Rusnia Junita Ismet, Rhahmasari Junita, Rusnia Moh. Azhar Afandy Mustikaningrum, Mega Muttaqim, Maulana S, Agustina Dyah