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All Journal Abdi Masyarakat JPIn : Jurnal Pendidik Indonesia Jurnal Pengabdian UNDIKMA Hydrogen: Jurnal Kependidikan Kimia Empiricism Journal Bakti Sekawan : Jurnal Pengabdian Masyarakat
Dahlia Rosma Indah
Universitas Pendidikan Mandalika
Religion Agriculture, Biological Sciences & Forestry Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Nursing Public Health Social Sciences Other

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Journal : Hydrogen: Jurnal Kependidikan Kimia

 1 
Efektivitas Ampas Tahu Sebagai Adsorben Logam Tembaga Pada Air Limbah Industri Dahlia Rosma Indah; Husnul Hatimah; Hulyadi Hulyadi
Hydrogen: Jurnal Kependidikan Kimia Vol 9, No 2 (2021): Hydrogen: Jurnal Kependidikan Kimia
Publisher : Universitas Pendidikan Mandalika Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.476 KB) | DOI: 10.33394/hjkk.v9i2.4373

Abstract

Copper is one of the toxic metals for health and the environment. In humans, high doses of copper metal can cause vomiting, dizziness, weakness, kidney and liver symptoms, anemia, to coma, and in severe cases, the patient can die. Judging from the dangers, proper waste management is needed to reduce the side effects of these pollutants. A practical and inexpensive technology is an adsorption adsorption technique using an efficient and easily available natural adsorbent, namely tofu dregs. The protein contained in tofu is one of the reasons for using tofu waste as an adsorbent. The absorption of amino acids that form two-charged ions (zwitter ions) is owned by proteins. Toxic metal can be bound to protein as metallotionein. The study consisted of four stages, namely (1) Analysis of initial copper content in silver craft waste; (2) Preparation of tofu waste adsorbent; (3) Characterization of tofu dregs adsorbent; and (4) variation of adsorption contact time. The study used a laboratory-scale experimental method. The adsorbent was contacted with the sample using a magnetic stirrer at various times. Instrument Atomic Absorption Spectrometer was used for the analysis of copper metal content and identification of its functional groups using an infrared spectrometer with the result that tofu waste has functional groups -OH, NH (stretching), CH (aliphatic), C=O, -OH (bending vibrations). , and CO. Copper metal content obtained is 19.5979 ppm. The optimum adsorption time was reached at 120 minutes with an optimum adsorption efficiency of 54.88%.
Efisiensi Adsorpsi Metilen Biru Menggunakan Karbon Baggase Teraktivasi Husnul Hatimah; Dahlia Rosma Indah; Intan Kusuma Wardani
Hydrogen: Jurnal Kependidikan Kimia Vol 10, No 2 (2022): Hydrogen: Jurnal Kependidikan Kimia
Publisher : Universitas Pendidikan Mandalika Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v10i2.6410

Abstract

Lombok Island has a distinctive culture and produces handicraft products with cultural motifs such as traditional woven fabrics of the Sasak tribe. Dyeing of woven fabrics using natural and artificial dyes. For artificial dyes, one of which is methylene blue dye. Residual water or former dyeing in coloring is usually immediately discharged into the environment which causes pollution or hazardous waste for living things. The presence of dyes greatly affects the environment because of their high toxic effects, can cause allergies and skin irritation, and can cause gene changes and are carcinogenic. Based on these problems, processing is needed to reduce the pollutant substances that are generated. One of the technologies used is adsorption using a natural adsorbent that is efficient and easy to obtain, namely activated carbon baggase (bagasse). Bagasse carbon made through the pyrolysis stage (carbonation process) at a certain temperature can be used as an alternative adsorbent for the adsorption of pollutant dyes. This study aims to determine the characteristics and adsorption efficiency of methylene blue by activated carbon baggase. This study used experimental methods with gravimetric techniques, batch techniques, and samples were analyzed using Uv-Vis Spectrophotometry. A 10 mL sample of 10 ppm methylene blue was contacted with one gram of activated carbon baggase. The research was conducted in six stages. The first stage is to prepare activated carbon baggase adsorbents. The second, third, and fourth stages are optimization of the methylene blue solution. The fifth to the sixth stage is the measurement of methylene blue adsorption on activated carbon baggase adsorbents with variations in pH and contact time. Characteristics of activated carbon baggase in this study obtained a moisture content of 4.64% and an ash content of 5.37%. The optimum pH was obtained at pH 5 with an adsorption efficiency of 86.4%, while the optimum contact time was obtained at 80 minutes with an adsorption efficiency of 86.9%. From these results it can be concluded that the activated carbon baggase adsorbent is effective in adsorbing methylene blue so that it can be used to overcome pollution problems caused by dye waste.
Characterization Of Pure and Immobilized Invertase Enzyme Using Activated Carbon Dahlia Rosma Indah; Husnul Hatimah
Hydrogen: Jurnal Kependidikan Kimia Vol 11, No 2 (2023): April 2023
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v11i2.8150

Abstract

This research is conducted to determine the optimum pH, the optimum temperature, the optimum incubation time, Km and Vmaks enzym invertase mobile and immobile. The research variable are the characteristic of enzym invertase mobile and immobile that include the optimum pH, the optimum temperature, the optimum incubation time, Km, Vmaks and the activity of enzym. The instrument of the research is spectronic UV-Vis. The result of the research are absorbance value and henceforth that will be substituted into the similarity of standart liquid invert sugar in regretion curva, from this procedure the researcher find the concentration’s product (invert sugar). This concentration value will be used for determining enzym activities. The data are collected then analyzed by using descriptive method that use a corelation graph between enzym activity and research variable.The result of the research shows that enzym invertase mobile have optimum pH 4.5, optimum temperature 55°C; optimum incubation time 25 minute; Km value 1,279 mg/mL (4,737 x 10-6 mol/L) and Vmaks value 23,256 mg/mL/menit. The enzym invertase immobile have optimum pH 4; optimum temperature 60°C; optimum incubation time 30 minute; Km value 2,255 mg/mL (8,352 x 10-6 mol/L) and Vmaks value 19,608 mg/mL/minute.
Co-Authors Ahmadi Ahmadi Ayu Lestari Citra Ayu Deewi Hendrawani Hendrawani Hulyadi Hulyadi Husnul Hatimah Husnul Hatimah Intan Kusuma Wardani Pahriah Pahriah Ratna Azizah Mashami Suryati Suryati Yeti Kurniasih Yuli Anggraini Putri Yusran Khery