Preparasi Membran HDPE/PVP dengan Pelapisan PDMS untuk Pemisahan Urea

Firera, Nisa Putri (2026) Preparasi Membran HDPE/PVP dengan Pelapisan PDMS untuk Pemisahan Urea. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5004221165-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (5MB) | Request a copy

Abstract

Limbah cair yang mengandung senyawa nitrogen seperti urea perlu diolah sebelum dibuang ke lingkungan karena dapat meningkatkan beban nutrien dan memicu penurunan kualitas perairan. Penelitian ini dilakukan untuk memfabrikasi membran berbasis high density polyethylene (HDPE) dengan penambahan polyvinylpyrrolidone (PVP) dan pelapisan polydimethylsiloxane (PDMS) untuk pemisahan urea. Membran difabrikasi dengan metode thermally induced phase separation (TIPS) dengan variasi PVP 0; 0,5; 0,75; dan 1%. Pelapisan PDMS dilakukan pada variasi membran tertentu untuk mengetahui pengaruh lapisan permukaan terhadap karakteristik dan performa membran. Karakterisasi dilakukan dengan FTIR, XRD, SEM, sudut kontak air, dan porositas untuk mengevaluasi struktur kimia dan sifat fisik membran. Hasil karakterisasi menunjukkan bahwa penambahan PVP meningkatkan kemampuan pembasahan permukaan, sedangkan pelapisan PDMS mengubah karakter permukaan tanpa mengubah struktur kimia utama HDPE. Hasil pengujian menunjukkan bahwa membran M0,5 menghasilkan fluks air murni dan fluks urea tertinggi, masing-masing sebesar 23,803 dan 26,174 L/m²·jam. Membran M0,5-PDMS 55,824% menunjukkan rejeksi urea sedikit lebih tinggi dibandingkan M0,5 55,374%, namun diikuti oleh penurunan fluks akibat meningkatnya hambatan transport. Penambahan PVP sebesar 0,5% memberikan pengaruh paling baik terhadap transport cairan karena mampu meningkatkan kemampuan pembasahan permukaan dan mendukung pembentukan jalur pori. Namun, peningkatan konsentrasi PVP tidak menghasilkan kenaikan fluks secara linear. Pelapisan PDMS menurunkan nilai fluks karena terbentuknya lapisan permukaan yang menambah hambatan transport cairan. Berdasarkan hasil tersebut, membran M0,5 menunjukkan performa permeabilitas terbaik, sedangkan pelapisan PDMS mengubah karakter permukaan dan sedikit meningkatkan rejeksi urea tanpa mengubah struktur kimia utama HDPE.
===================================================================================================================================
Wastewater containing nitrogen compounds such as urea must be treated before being discharged into the environment, as it can increase nutrient loading and contribute to the degradation of water quality. This study aimed to fabricate high density polyethylene (HDPE)-based membranes with the addition of polyvinylpyrrolidone (PVP) and polydimethylsiloxane (PDMS) surface coating for urea separation. The membranes were fabricated using the thermally induced phase separation (TIPS) method with PVP variations of 0, 0.5, 0.75, and 1%. PDMS coating was applied to selected membrane variations to evaluate the effect of surface modification on membrane characteristics and performance. Membrane characterization was carried out using FTIR, XRD, SEM, water contact angle, and porosity analysis to evaluate the chemical structure and physical properties of the membranes. The characterization results indicated that the addition of PVP improved membrane surface wettability, while PDMS coating modified the surface characteristics without altering the main chemical structure of HDPE. Membrane performance was evaluated through pure water flux, urea flux, and urea rejection tests. The results showed that the M0,5 membrane produced the highest pure water flux and urea flux, with values of 23.803 and 26.174 L m⁻² h⁻¹, respectively. The M0.5-PDMS membrane exhibited a slightly higher urea rejection (55.824%) than the M0.5 membrane (55.374%), although this improvement was accompanied by a significant decrease in flux due to the increased transport resistance introduced by the PDMS coating. The addition of 0,5% PVP resulted in the most favorable liquid transport performance because it improved surface wettability and promoted the formation of effective pore pathways. However, increasing the PVP concentration did not lead to a linear increase in flux. PDMS coating decreased the flux due to the formation of a surface layer that increased resistance to liquid transport. Based on these results, the M0,5 membrane showed the best flux performance, whereas PDMS coating played a more dominant role in modifying the membrane surface characteristics without altering the main chemical structure of HDPE.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	HDPE, PVP, PDMS, membran, fluks, urea. HDPE, PVP, PDMS, membrane, flux, urea.
Subjects:	Q Science Q Science > QD Chemistry > QD63.S4 Separation (Technology)
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Nisa Putri Firera
Date Deposited:	07 Aug 2026 02:04
Last Modified:	07 Aug 2026 02:04
URI:	http://repository.its.ac.id/id/eprint/144191

Actions (login required)

View Item