No abstract

Limbah kulit pisang Kepok telah digunakan untuk menghasilkan biosorben melalui proses yang ramah lingkungan. Limbah kulit pisang Kepok dipotong, dicuci, dikeringkan, dihaluskan dan digunakan sebagai biosorben terhadap logam besi. Penentuan konsentrasi logam besi terhadap proses adsorpsi menggunakan spektroskopi serapan atom. Adsorpsi ion besi terhadap adsorben kulit pisang Kepok menggunakan parameter waktu kontak dan pH. Waktu kontak 30 menit dan pH 6 merupakan kondisi yang sesuai untuk adsorpsi besi. Persentase adsorpsi dan kapasitas adsorpsi yang diperoleh berturut-turut sebesar 86,387% dan 1,44 mg/g. Hasil penelitian menunjukkan bahwa kulit pisang Kepok, sebagai limbah pertanian dan limbah industri rumahan, sangat berpotensi sebagai adsorben untuk menghilangkan logam beracun seperti besi dalam air.

The rise of media coverage regarding the production of illegal and dangerous cosmetics is one proof that the use of cosmetics is currently a necessity. Online marketing is one of the facilities for spreading these illegal cosmetics. Thus, it is necessary to educate the public, especially social media users who are generally in productive age range, to be more careful in choosing safe cosmetics. In this community service activity, education was carried out to 17 participants from senior high school student. The method used includes the presentation by the presenter as well as discussion and question and answer. To measure the increase in knowledge, pre-test and post-test were carried out. It was found that 64.7% experienced an increase in knowledge after this activity was held.

<p>The present study used adsorbents from Kepok banana peel to remove Fe (II) from an aqueous solution. The effect of adsorbent dose and initial metal concentration was investigated at room temperature to evaluate the maximum adsorption and adsorption capacity of Kepok banana peels. The adsorption parameters studied were adsorbent mass [0.5-2.5 g], and initial Fe (II) concentration [30-70 mg/L], where the operating conditions were 50 ml of Fe metal solution was added to each adsorbent, the pH value of the mixture was adjusted to 6. Then the mixture was stirred at 250 rpm for 30 minutes. In the adsorption process, it was found that 2.5 grams of mass adsorbent and 60 mg/L as initial metal concentration gave the highest adsorption and adsorption capacity, with 57.99% and 0.644 mg/g, respectively. FTIR spectra of adsorbent showed hydroxyl, carboxylic, and amine groups in Kepok banana peels. This study showed that Kepok banana peels had good potential for removing Fe (II) ions and could be used as a good adsorbent for removing the Fe (II) from water and wastewater at very little concentration.</p>

Penelitian ini bertujuan untuk mengidentifikasi logam berat dalam produk lipstik yang beredar di pasar Darmo Trade Center (DTC) Surabaya. Dua belas sampel lipstik diteliti untuk mengetahui kandungan logam timbal (Pb). Empat reagen sederhana, meliputi HCl, NaOH, KI dan NH4OH digunakan untuk mengidentifikasi adanya logam berat ini. Dari dua belas sampel lipstik, enam diantaranya memiliki nomor registrasi BPOM dan enam sampel lainnya tidak memiliki nomor registrasi BPOM. Dan masing-masing keenam sampel ini terdiri dari tiga merk berbeda yang dibeli dari tiga toko berbeda, dalam penelitian ini disebut varian. Identifikasi Pb menunjukkan bahwa dari enam sampel lipstik yang memiliki nomor registrasi BPOM, empat diantaranya positif mengandung Pb. Sedangkan enam sampel lain yang tidak memiliki nomor registrasi BPOM, dua diantaranya positif mengandung cemaran logam Pb.Kata kunci: Logam berat, Timbal, Darmo Trade Center (DTC) Surabaya, Reagen sederhana