Penelitian ini bertujuan untuk mengetahui variasi massa adsorben dan laju alir yang paling optimum, efisiensi penjerapan (Ep), kapasitas adsorpsi paling tinggi, serta tipe adsorpsi dari karbon aktif teraktivasi ZnCl2 terhadap penyerapan logam Cu dan Zn dalam limbah simulasi menggunakan sistem kolom kontinyu. Metode adsorpsi logam Cu dan Zn dilakukan secara kontinyu dengan menggunakan kolom. Limbah simulasi dialirkan secara gravitasi dari atas ke bawah melalui kolom yang telah diisi adsorben. Subjek dalam penelitian ini adalah karbon aktif dari daun pandan laut teraktivasi ZnCl2 5%. Sementara objek pada penelitian ini adalah efisiensi adsorpsi, kapasitas adsorpsi, dan tipe adsorpsi dari adsorben daun pandan laut teraktivasi ZnCl2 5% terhadap logam Cu dan Zn. Analisis kandungan logam Cumenggunakan Spektrofotometer UV-Visible dan logam Znmenggunakan Spektrofotometer Serapan Atom (SSA). Hasil penelitian menunjukkan bahwa massa adsorben optimum untuk penurunan kadar logam Cu dan Znberturut-turut adalah 0,7 gram dan 0,9 gram dengan laju alir optimum sebesar 0,3 mL/menit dan 0,2 mL/menit, maka akan dihasilkan efisiensi adsorpsi terbesar untuk logam Cuyaitu 96,6854% dan 38,6576% untuk logam Zn. Kapasitas adsorpsi tertinggi karbon aktif dari daun pandan laut teraktivasi ZnCl2 terhadap penyerapan logam Cu dan Zn berturut-turut sebesar 48,8149 mg/g dan 16,3567 mg/g. Tipe adsorpsi logam Cu memenuhi pola isoterm Langmuir.
This research aims to prepare an adsorbent from Kelud volcanic ash for better Cu(II) adsorption efficiency than Kiesel gel 60G E'Merck. Adsorbent synthesis was done by dissolving 6 grams of volcanic ash activated 700oC 4 hours and washed with HCl 0.1 M into 200 ml of 3M sodium hydroxide with stirring and heating of 100 °C for 1 hour. The filtrate sodium silicate was then neutralized using sulfuric acid. The mixture was allowed to stand for 24 hours then filtered and washed with aquaDM, then dried and crushed. The procedure is repeated for nitric acid, acetic acid and formic acid with a contact time of 24 hours. The products were then characterized using FTIR and XRD, subsequently determined acidity, moisture content, and tested for its adsorption of the ion Cu (II) with AAS. The results showed that the type of acid that produced highest rendemen is AK-H2SO4-3M ie 36.93%, acidity of the adsorbent silica gel synthesized similar to Kiesel gel 60G E'Merck ie adsorbent AK-CH3COOH-3M and the water content of the silica gel adsorbent synthesized similar to Kiesel gel 60G E'Merck ie adsorbent AK-H2SO4-2 M. The character of the functional groups of silica gel synthesized all have similarities with Kiesel gel 60G E'Merck as a comparison. Qualitative analysis by XRD for all modified adsorbent showed a dominant peak of SiO2 except adsorbent AK-H2SO4 amorphous and chemical bonds with FTIR indicates that it has formed a bond of Si-O-Si and Si-OH. The optimum adsorption efficiency of the metal ions Cu(II) obtained from AK-H2SO4-5M adsorbent that is equal to 93.2617% and the optimum adsorption capacity of the Cu(II) metal ions was obtained from the adsorbent AK-CH3COOH-3M is equal to 2.4919 mg/ g. Keywords: adsorbents, silica gel, adsorption, kelud volcanic ash
Chromium-containing silicalite-1, designed CrS-1, was synthesized by the hydrothermal method and characterized by XRD and FTIR techniques. The objectives of the research are to study the synthesis of CrS-1 and investigate the effect of crystallization temperatures and times toward its character. All samples of CrS-1 crystallized in orthorhombic structure and Pnma space group. The phase observed in the XRD patterns of CrS-1 synthesized from 150 to 190 oC for 11 days showed only MFI-type phase. The CrS-1 prepared under static condition for 1 day at 150 oC indicated -SiO2 phase, on the contrary, the samples conditioned for 2 to 8 days at 150 oC are only MFI phase. Keywords: Crystallization, synthesis, chromium silicate CrS-1, incorporation.
Titanium dioxide (TiO 2)-nanotubes were prepared by a simple technique reflux. The morphologies and microstructures of nanotubes were characterized by high resolution scanning electron microscopy (HRSEM), high resolution transmission electron microscopy (TEM), powder X-ray diffraction (XRD,) energy dispersive X-ray spectroscopy (EDS) and surface area analyzer. The microstructures of TiO 2 phases obtained from the sintering process of TiO 2-nanotubes for 1 hour at various temperatures from 100 to 1000 °C at intervals of 50 °C were investigated from the XRD diffractograms. The analyses of morphologies and microstructures from HRSEM and HRTEM images describe the sample as nanotubes. The nanotube is single phase exhibiting TiO 2 (B) structure. The XRD patterns show that TiO 2 (B)-nanotubes transform into anatase phase and then become rutile due to increasing sintering temperatures.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.