Adsorption and Regeneration of Indonesian Natural Pumice for Total Chromium Removal from Aqueous Solution

Abstract

To investigate the potential of adsorption and regeneration of natural pumice from West Sumatera Indonesia for total chromium (Cr) removal from aqueous solution, batch experiments in multiple adsorption-desorption cycles were performed. The results indicated that the optimum condition of total Cr removal were 3 of pH solution, 0.3 g/L of adsorbent dose, 60 min of contact time of adsorption, <63 ?m of diameter of adsorbent, and 1 mg/L of total Cr initial concentration with 2.226 mg Cr/g pumice of total Cr uptake. The experimental data obtained were fitted with the Freundlich adsorption isotherm within the concentration range studied. Desorption efficiencies for total Cr ions by using 0.1 M HCl as desorbing agent were in the range of 31-32%. Although complete desorption were not attained, the natural pumice could be sufficiently reused up to 3 cycles of adsorption- desorption with increasing trend in total Cr uptake that may due to the surface modification of natural pumice caused by HCl. Overall results revealed that easy availability of natural pumice as local mineral in West Sumatra, Indonesia and its ability to adsorb and retain total Cr will create more interest to develop new natural adsorption method of pollutant removal from solution.

Facile preparation of amine -functionalized corn husk derived activated carbon for effective removal of selected heavy metals from battery recycling wastewater

“…An absorption band at 2398.06 cm −1 was attributed to the C=O stretching vibrations of carboxylic while the steep peaks observed around 1630.29 to 1398.26 cm −1 corresponded to the C–C stretching, and C–O asymmetric stretch which might be attributed to the presence of an aromatic or olefinic compounds ( Lin et al., 2019 ). The C–Br Stretching vibration and C–O stretching of alcohol or carboxylic acid were recorded at peaks ranging from 1003.01 to 898.34 cm −1 ( Indha et al., 2016 ). Figure 1 (b) shows the FT-IR spectrum of the amine-modified adsorbent, which shows peaks at 3850.13, 3632.07, 3450.53, 2389.63, 2128.13, 956.10, and 602.54 cm −1 , which are attributed to the O–H stretching vibration, C–H asymmetric stretching vibration of the CH 2 group connection, C–H stretching vibration, C=O stretching vibrations, and C–Br stretching vibrations, respectively.…”

Análise Do Escoamento Turbulento Em Torneira Bica Alta Por Meio Da Fluidodinâmica Computacional

“…Indah et al (2018) investigaram o potencial de adsorção e regeneração da púmice na remoção de cromo e obtiveram remoção de 2,226 mg de cromo por grama de adsorvente, em pH 3, com 0,3 g/L de adsorvente e uma hora de contato. Em pH baixos, a superfície do adsorvente é protonada, favorecendo a atração eletrostática dos ânions cromato (CrO 42 ) e dicromato (Cr 2 O 7 2-) em solução aquosa.…”

Technical and Economic Efficiency Modeling in Sucroenergetic Mills Steam Generation Centers

“…Indah et al (2018) investigaram o potencial de adsorção e regeneração da púmice na remoção de cromo e obtiveram remoção de 2,226 mg de cromo por grama de adsorvente, em pH 3, com 0,3 g/L de adsorvente e uma hora de contato. Em pH baixos, a superfície do adsorvente é protonada, favorecendo a atração eletrostática dos ânions cromato (CrO 42 ) e dicromato (Cr 2 O 7 2-) em solução aquosa.…”