The use of modified polyurethane foam adsorbents for mercury adsorption applications can reduce the impact of mercury pollution. This study aims to study the characteristics of adsorbents made from castor oil, MDI (Methylene diphenyl diisocyanate), glycerol, distilled water and modified by the addition of zeolite and bentonite. Polyurethane foam which has optimum performance is further characterized to determine physical and chemical properties, including: functional groups (FTIR), morphology (SEM) and area (BET). The results of FTIR Characterization showed that in polyurethane foams without modification there was a C = O group which is a typical group in the polyurethane group shown in wavenumber (1654-1516 cm−1, 1680-1514 cm−1, and 1593-1516 cm−1) Whereas in zeolite modified polyurethane foam there is a C = CH group with a wavenumber of 3008 cm−1 which is a typical group for zeolite whereas in bentonite there is a C = CH group with a wavenumber of 3007 cm−1 which is a typical group for bentonite. The results of SEM characterization show that zeolite modified polyurethane foam has a smooth and flat structure with small pores and polyurethane foam with bentonite has irregular or irregular particle shape. The average BET area obtained in the PUF modification is 1.3778 m2 g−1. Whereas for the smallest BET area obtained at synthetic PUF 19.1 gr + Zeolite 40% for 0.773 m2 g−1, the area is influenced by the comparison of composition from polyurethane foam synthesis.

This paper proposed adsorbent development by synthesizing polyurethane foam (PUF) using a simple method, mixing polyol with isocyanate and adding fillers of bentonite and magnetite to the PUF matrix. The study's main objective was to produce a PUF-based adsorbent with high reactivity to remove Hg2+ in wastewater. This bentonite and magnetite filler-modified polyurethane foam (BMPUF) adsorbent was fixed in a bed column for the adsorption of mercury (II) ions from an aqueous solution. The effect of initial Hg2+ concentration on the removal rate and the effect of contact time on adsorption efficiency was investigated. Langmuir, Freundlich, and BET non-linear models were taken into account to determine the best adsorption isotherm fitting and obtain adsorption capacity, intensity, and pore volume. As a result, it followed the non-linear Freundlich model, and the average adsorption capacity and intensity were 0.466 mg/g and 0.923, respectively. The average BET-based pore volume obtained was 0.782 L/mg. The kinetics study showed that the non-linear pseudo-first-order kinetics model was more suitable for describing the Hg2+ adsorption kinetics. The maximum equilibrium adsorption capacity was 1.770 mg/g with the adsorption rate of 0.0013 min-1 based on the non-linear model. The effect of varying bentonite and magnetite ratio on adsorption isotherm and kinetics was also investigated. Overall, the potential application of BMPUF adsorbent in the adsorption of mercury (II) ions was demonstrated in the current study.

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Penelitian ini bertujuan untuk melihat hubungan mengenai tingkat kecelakaan lalu lintas berdasarkan provinsi di Indonesia. Penelitian ini menggunakan data sekunder yaitu data kecelakaan lalu lintas 4 bulan pertama tahun 2019 di Indonesia dengan jumlah sampel sebanyak 31 provinsi. Analisa data dalam penelitian ini menggunakan analisis deskriptif, uji Chi-Square, analisis profil baris dan kolom, analisis nilai inersia baris dan kolom, serta grafik Korespondensi. Berdasarkan hasil penelitian, diketahui bahwa kecelakaan luka ringan merupakan tingkat kecelakaan dengan jumlah terbesar di Indonesia, dengan persentase sebesar 21,4% korban kecelakaan lalu lintas terdapat di provinsi Jawa Timur, sebesar 17,7% terdapat di provinsi Jawa Tengah. Berdasarkan grafik korespondensi korban kecelakaan luka ringan dan meninggal dunia dominan terjadi di provinsi Jawa Timur, Jawa Tengah, dan Jawa Barat. Korban kecelakaan luka berat dominan di provinsi Sumatera Utara dan Lampung.