Judul: Pemanfaatan Sekam Padi sebagai Adsorben Logam Timbal dalam Kerang darah
Abstrak: Water pollution by lead affects one of potential food, such as blood cockles. The aim of this research is to compare rice husk and rice husk charcoalinreducinglead concentration in the blood cockles. The rice husk and rice husk charcoalwere activated by NaOH 1 M, then theiradsorption toward lead solution and lead in blood cockles were determined.The result showed that the maximum capacity of the activated rice husk and rice husk charcoal were29 mg/g and 52 mg/g,respectively,at optimum condition of adsorption. The optimumadsorption condition in 100 mL Pb solution by the activatedrice husk was 0.32 g, pH 5, and 4 hours, whileby theactivatedrice husk charcoalwas 0.20 g, pH 5, and 2 hours. Lead content in blood cockles was 2 mg/kg, which washigher thanthe threshold. Lead adsorption bythe activatedrice husk reduced lead concentration in blood cockles of 40% better than the activatedrice husk charcoal, which was 32%.
Keyword: rice husk, lead adsorption, charcoal of rice husk, blood cockle

Judul: Kajian Pustaka Silika Gel Asal Sekam Padi sebagai Adsorben Logam Berat
Abstrak: Meningkatnya kemajuan industri, pencemaran akibat limbah yang mengandung logam berat juga meningkat. Penanggulangan logam berat dengan proses adsorpsi yang memanfaatkan sekam padi sebagai adsorben. Sekam padi memiliki kandungan silika yang cukup tinggi. Kajian literatur ini bertujuan mengetahui potensi silika asal sekam padi sebagai adsorben logam berat melalui perlakukan yang berbeda. Sintesis silika menggunakan metode sol gel. Untuk meningkatkan kapasitas adsorpsi dilakukan penambahan aktivator asam bertujuan menghilangkan pengotor pada permukaan Selain itu, dilakukan modifikasi pada permukaan silika yang berhasil meningkatkan keasaman permukaan dan penambahan gugus fungsi baru yang dapat meningkatkan keaktifan pembentukan ikatan dengan logam berat. Hasil aktivasi dan modifikasi didukung dengan analisis gugus fungsi, permukaan, dan komposisi adsorben. Selain itu, dilakukan optimasi beberapa parameter adsorpsi berupa pH yang akan menghasilkan kapasitas adsorpsi maksimum., As the industrial sector grows, contamination from industrial waste that contains heavy metals is also increasing. One of the methods to remove heavy metals from industrial waste is the adsorption process by utilizing agricultural waste in the form of rice husks as adsorbent. Rice husk has high silica components. This literature review aims to determine the potential of silica from rice husks as an adsorbent of heavy metals through several different treatments. Silica synthesis using the sol-gel method. To improve the adsorption capacity, acid activation was carried out to remove impurities on the surface and modification of the silica surface. The modifications made were successful in increasing surface acidity and the addition of new functional groups which could increase the activity of bond formation with heavy metals. The results of activation and modification are supported by analysis of functional groups, surface, and composition of the adsorbent. In addition, the optimization of several.
Keyword: adsorbent, adsorption, heavy metals, rice husk, silica gel

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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