Perpustakaan Terpadu

Ampas Kopi merupakan limbah akhir dari proses penyeduhan kopi yang dapat dimanfaatkan sebagai adsorben. Salah satunya adalah dapat menyerap logam besi dengan cara diaktivasi menggunakan larutan asam klorida. Arang aktif yang terbuat dari ampas kopi telah diteliti mampu menurunkan kadar rodhamin B, ammonia, nitrit, nitrat, kadmiun, dan tembaga pada larutan. Penelitian ini bertujuan untuk mengetahui kemampuan adsorpsi arang aktif ampas kopi arabika teraktivasi asam klorida (HCl) 1 N terhadap logam besi secara kolorimetri dengan tiosianat. Kondisi penyerapan dilakukan dengan menambahkan arang aktif ampas kopi arabika berbeda yaitu, 5 gram, 10 gram, dan 15 gram pada masa kontak yang sama yaitu kecepatan pengadukan 200 rpm selama 45 menit terhadap larutan uji standar besi 50 ppm dan larutan uji air sumur 50 ppm. Pengujian arang aktif ampas kopi arabika pada larutan standar besi 50 ppm yaitu untuk memperkirakan sisa kadar besi tertinggal tetap dapat dianalisis oleh spektrofotoemter UV-Vis. Sedangkan larutan air sumur 50 ppm untuk mengetahui kemampuan adsorpsi terhadap air sumur sebagai sampel pengaplikasian arang aktif ampas kopi. Hasil penelitian menunjukan bahwa kondisi adsorpsi yang paling baik terhadap larutan standar besi 50 ppm terjadi pada penambahan massa arang aktif 15 gram (rata-rata kadar besi tertinggal 3,197 ppm) dan pada larutan uji air sumur mengandung 50 ppm besi terjadi pada penambahan massa arang aktif 15 gram (kadar besi tertinggal 4,03 ppm). Sedangkan hasil kapasitas adsorpsi arang aktif menunjukkan hasil terbaik pada penambahan massa 5 gram pada kedua larutan uji, yaitu pada larutan stadar besi 50 ppm sebesar 1,36 mg/g dan pada larutan air sumur 50 ppm besi sebesar 1,35 mg/g. Kata Kunci : Ampas kopi, Arang aktif, Logam Besi, Adsopsi

Coffee grounds are the final waste from the coffee brewing process that can be utilized as an adsorbent. One of them is able to absorb iron metal by activating it using hydrochloric acid solution. Activated charcoal made from coffee grounds has been studied to reduce the levels of rodhamin B, ammonia, nitrite, nitrate, cadmium, and copper in the solution. This study aims to determine the adsorption ability of activated charcoal of Arabica coffee grounds activated by 1 N hydrochloric acid (HCl) against iron metal colorimetrically with thiocyanate. Absorption conditions were carried out by adding different arabica coffee grounds activated charcoal, namely, 5 grams, 10 grams, and 15 grams at the same contact period, namely 200 rpm stirring speed for 45 minutes against 50 ppm iron standard test solution and 50 ppm well water test solution. Testing activated charcoal arabica coffee grounds on a 50 ppm iron standard solution is to estimate the remaining iron levels left behind can still be analyzed by a UV-Vis spectrophotometer. While the 50 ppm well water solution to determine the adsorption ability of well water as a sample of the application of activated charcoal coffee grounds. The results showed that the best adsorption conditions against the standard solution of 50 ppm iron occurred in the addition of activated charcoal mass of 15 grams (average iron content left behind 3.197 ppm) and in the test solution of well water containing 50 ppm iron occurred in the addition of activated charcoal mass of 15 grams (iron content left behind 4.03 ppm). While the results of the adsorption capacity of activated charcoal showed the best results in the addition of a mass of 5 grams in both test solutions, namely in the 50 ppm iron stadar solution of 1.36 mg/g and in the well water solution of 50 ppm iron of 1.35 mg/g. Keywords: Coffee grounds waste, activated charcoal, iron metal, adsorption.