Sintesa superabsorben aerogel selulosa dari kertas bekas

Prakasa, Bhisma Anugerah Agung and Matahari, Sam (2015) Sintesa superabsorben aerogel selulosa dari kertas bekas. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mempelajari proses sintesa dan karakteristik dari superabsorbent aerogel dari kertas bekas. Proses sintesa diawali dengan tahap pembuatan pulp dari kertas bekas untuk memperoleh selulosa. Selanjutnya pulp dicampur dengan larutan NaOH 2 wt% dengan variasi penambahan larutan urea 0 wt% - 10 wt% sehingga terbentuk gel. Gel yang terbentuk dikoagulasikan menggunakan etanol 99 vol% dan kemudian direndam dalam demineralized water sebagai solvent exchange. Gel kemudian dibekukan pada suhu -18°C. Gel yang telah membeku selanjutnya dikeringkan menggunakan freeze dryer sehingga air yang terkandung di dalamnya mengalami sublimasi. Berdasarkan percobaan yang telah dilakukan didapatkan aerogel berwarna putih dengan densitas yang sangat ringan yaitu sebesar 0,043 g/cm3 dengan diameter serat sebesar 7,5-10 μm dan pororsitas sebesar 0,971. Aerogel yang dihasilkan mampu menyerap air hingga 24,015 kali berat keringnya. Kemampuan menyerap air dan porositas pada aerogel yang dihasilkan berbanding terbalik dengan konsentrasi urea yang ditambahkan. Aerogel dapat digunakan kembali dengan cara diperas hingga 89,9% air yang terkandung mampu terpisah. Aerogel juga dapat digunakan untuk menyerap minyak hingga 19,071 kali masa keringnya. Secara mekanis, melalui uji TGA aerogel selulosa yang dihasilkan dapat bertahan hingga suhu 230°C dan dari uji tekan aerogel yang dihasilkan memiliki modulus young maksimal sebesar 10.200 N/m2 dan menunjukkan fleksibilitas yang baik. ========================================================================================================== The purpose of this research was to developed a method of synthesizing and characterizing superabsorbent cellulose aerogel from paper waste. This research was begun by removing cellulose from the paper waste using re-pulping process. Then, the pulp that had been removed was mixed with 2%wt NaOH solution and urea, which 0%wt – 10%wt variation was given, and freezed until became a gel. Then, the it was submerged into 99 vol% ethanol for coagulation process. After that, gel was submerged into demineralization water for the solvent exchange process. Gel was freezed at -18°C in the freezer. Water contain in gel was removed by using freeze drying method, so water contain in the sample could be removed by sublimation. The result was the white-colored aerogel which has extremely low density of 0,043 g/cm3 with the diameter of fiber is 7,5-10 μm and the porosity is 0,971. The Aerogel has the capacity to absorb water until 24,015 its weight, more urea concentration added on to the solution, the lower absorbtion capacity and porosity aerogels had. Aerogel can be reused by squeezing until its removed 89,8% the existing water. Furthermore, its can absorb oil until 19,071 its weight. Mechanically, by TGA characterization the aerogel could be used until 230°C and by compression test the maximum modulus young that aerogel had was 10.200 N/m2 which indicated the sample has a good flexibility.

Item Type: Thesis (Undergraduate)
Additional Information: RSK 541.345 13 Pra s
Uncontrolled Keywords: Superabsorben; Selulosa; Aerogel; Kertas Bekas
Subjects: Q Science > QC Physics > QC162 Adsorption and absorption
Divisions: Faculty of Industrial Technology > Chemical Engineering > (S1) Undergraduate Theses
Depositing User: - Taufiq Rahmanu
Date Deposited: 04 Apr 2019 03:29
Last Modified: 04 Apr 2019 03:29
URI: http://repository.its.ac.id/id/eprint/62694

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