Sintesis Dan Karakterisasi Kitosan Bertaut Silang Glutaraldehida Sebagai Adsorben Pemurnian Minyak Akar Wangi

Fathurrahman, Muhammad; Sugita, Purwantiningsih; Purwaningsih, Henny

doi:10.30870/educhemia.v2i1.1300

Cited by 3 publications

(2 citation statements)

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“…Jenis kitosan yang digunakan untuk menjernihkan air berupa kitosan dan kitosan crosslink GA. Penelitian yang dilakukan oleh Hendrawati dan S. L. Ihsani kitosan digunakan sebagai biokagulan mampu menurunkan nilai kekeruhan air sungai dan danau [2] [5]. Pada penelitian lain yang dilakukan oleh Fathurarahman M. pada tahun 2017 yang memanfaatkan kitosan bertaut silang glutaraldehida sebagai adsorben dengan kemampuan menyerap ion Fe(III) sebesar 91,9521% pada pemurnian minyak akar wangi [6]. Sedangkan penelitian yang dilakukan oleh D. H. Sukma pada tahun 2018 kitosan dengan modifikasi crosslink GA memiliki kemampuan yang lebih baik dibandingkan dengan kitosan cair (larutan kitosan) [7].…”

Section: Pendahuluanunclassified

Efektivitas Koagulan Kitosan Pada Pengolahan Air Di Unit Water Treatment PPSDM Migas Cepu

Mutakhabbibatillah,

Mahendra,

Chumaidi

et al. 2023

Distilat: J. Tekn. Sep

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Air Sungai Bengawan Solo digunakan sebagai bahan baku pengolahan air di Unit Water Treatment PPSDM Migas Cepu. Air sungai ini diolah menjadi air industri dan air bersih yang didistribusikan ke konsumen. Metode yang digunakan adalah koagulasi flokulasi. Penggunaan koagulan dari bahan kimia pada metode tersebut sudah sering digunakan daripada koagulan alami. Pada penelitian ini menggunakan metode koagulasi flokulasi dengan kitosan dari cangkang udang sebagai koagulan. Kitosan dimodifikasi dengan menaut silangkan glutaraldehida atau disebut dengan crosslink glutaraldehida (crosslink GA). Penelitian ini untuk mengetahui efektivitas penurunan kadar BOD (Biologycal Oxygen Demand), COD (Chemical Oxygen Demand), TSS (Total Suspended Solid), turbidity, dan pH pada air bersih di Unit Water Treatment PPSDM Migas Cepu menggunakan kitosan tanpa modifikasi dan dengan modifikasi. Variabel yang digunakan dalam penelitian ini adalah jenis dosis kitosan sebesar 400, 500, 600, dan 700 ppm. Hasil penelitian menunjukkan bahwa kitosan crosslink GA lebih efektif menurunkan kadar TSS, turbidity, dan pH yang optimum pada dosis 400 dan 700 ppm dengan nilai masing-masing sebesar 24 mg/L; 7,86 mg/L; dan 7,26. Koagulan kitosan juga efektif menurunkan nilai BOD dengan nilai sebesar 0,135 mg/L pada dosis 700 ppm. Sedangkan COD tidak dapat diturunkan kadarnya menggunakan kedua koagulan karena pemberian dosis yang tidak sesuai.

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Section: Pendahuluanunclassified

Efektivitas Koagulan Kitosan Pada Pengolahan Air Di Unit Water Treatment PPSDM Migas Cepu

Mutakhabbibatillah,

Mahendra,

Chumaidi

et al. 2023

Distilat: J. Tekn. Sep

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“…From the stages of the IDEAL problem-solving model, it is explained that the model can explore students' creativity in solving problems [25]. One of the characteristics of science material based on the context of the problem is chemistry, especially in acid-base solution, hydrolysis, buffers, and titration [26][27][28][29] .The study materials for acid-base solutions, hydrolysis, buffers, and titrations are deemed appropriate to use a problem-based learning design because these concepts are very close to everyday life which can be a "problem" in the learning stages that commonly occur in real life [30]. Thus, problem-solving abilities and learning outcomes as well as mastery of concepts will develop, because in the process of problembased learning the students themselves will find and build a concept.…”

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Assessment of High School Students’ Ability to Solve Structured Problems with Ideal Model on Acid-Base

Rokhim

Atikah²,

Vitarisma³

et al. 2023

Orbital: Electron. J. Chem.

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Problem-solving is one of the abilities that a student must-have in the 21st century. This is because students' ability to solve problems is expected to increase their competence of higher-order thinking skills (HOTS). Problem-solving ability can be improved in several ways for example, the use of a certain instructional model, worksheets, and assessment or assessment based on problem-solving. This study aimed to develop and implement structured problem-solving assessment with the IDEAL model on acid-base materials, salt hydrolysis, buffer solutions, and acid-base titrations to examine students' problem-solving abilities. The instrument development model used adapts the ADDIE model with four steps, namely analysis, planning, development, and implementation. The research sample were 34 high school students in grade 11 in Sidoarjo, East Java. The result is that the problem-solving ability with the lowest percentage are in the acid-base titration material for the Act on strategy indicator at 27.21%, while the highest percentage of skills are found in the buffer solution material for the Explore solution indicator at 89.5%. This study implies that the test instrument for further research is to measure students' ability to solve structured problems with the IDEAL model on acid and base. This study implies that the test instrument for further research measures students' ability to solve structured problems with the IDEAL model on acid-base, salt hydrolysis, buffer solution, and acid titration. So that the problem solving process with the integration of problem solving problems can improve students' critical thinking.

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Modification of Activated Carbon from Rice Husk using Hexadecyltrimethylammonium Bromide (HDTMA-Br) Surfactant and ZnCl2 activator and Microwaves for Nitrate Ion Adsorption

2020

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Surfactant Modified Activated Carbon (SMAC) is a surfactant-modified activated carbon product. The surfactant used in this study was the cationic surfactant Hexadecyltrimethylammonium Bromide (HDTMA-Br). These surfactants can change the activated carbon's surface to be positively charged due to the presence of the surfactant hydrophilic groups. This SMAC is more selective in absorbing anions, which in this study is for the adsorption of nitrate anions. This research aims to prepare a new material that is superior to activated carbon in absorbing nitrate anions. This research was conducted in several stages. In the first stage, rice husk was carbonized through pyrolysis at 300°C for 10 minutes. In the second stage, carbon was activated using 30% ZnCl2 and microwaves for 5 minutes and 400 W. The third stage was modifying activated carbon by contacting or adsorbing HDTMA-Br on activated carbon. The concentration of HDTMA-Br varied at 200-400 ppm and the adsorption time was 3-7 hours. The success of the modification was measured by the efficiency of HDTMA-Br in modifying activated carbon. This is supported by the results of the characterization of FTIR, GSA, SEM, and thermodynamic parameters. The resulting SMAC was applied for the adsorption of nitrate anions, and the results were compared to carbon and activated carbon. The results indicate that the best SMAC is formed at an optimum concentration of 300 ppm, within 4 hours, with an adsorption efficiency of 97.345%. The characterization results also show that SMAC has been formed, as evidenced by the presence of a peak at a wavenumber of about 1500 cm-1, a C-N group derived from N(CH3)3 in the HDTMA-Br surfactant structure. The SMAC spectra also appeared weak peaks at the wave number 2918 cm-1, which indicated the CH2-R group stretching from the HDTMA-Br surfactant. SEM image shows that HDTMA-Br has covered the pores of activated carbon. Meanwhile, the SMAC surface area is lower than that of activated carbon. Thermodynamic parameters indicate that HDTMA-Br interacts physically with activated carbon. The adsorption capacity of nitrate anion by SMAC is 3,638 mg/g, higher than carbon and activated carbon.

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Sintesis Dan Karakterisasi Kitosan Bertaut Silang Glutaraldehida Sebagai Adsorben Pemurnian Minyak Akar Wangi

Cited by 3 publications

References 0 publications

Efektivitas Koagulan Kitosan Pada Pengolahan Air Di Unit Water Treatment PPSDM Migas Cepu

Efektivitas Koagulan Kitosan Pada Pengolahan Air Di Unit Water Treatment PPSDM Migas Cepu

Assessment of High School Students’ Ability to Solve Structured Problems with Ideal Model on Acid-Base

Modification of Activated Carbon from Rice Husk using Hexadecyltrimethylammonium Bromide (HDTMA-Br) Surfactant and ZnCl2 activator and Microwaves for Nitrate Ion Adsorption

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