Arsenic Removal from Water by Adsorption onto Iron Oxide/Nano-Porous Carbon Magnetic Composite

Abstract

This study aimed to develop magnetic Fe3O4/sugarcane bagasse activated carbon composite for the adsorption of arsenic (III) from aqueous solutions. Activated carbon (AC) was prepared from sugarcane bagasse by chemical activation using H3PO4 as an activating agent at 400 °C. To enhance adsorption capacity for arsenic, the resultant AC was composited with Fe3O4 particles by facile one-pot hydrothermal treatment. This method involves mixing the AC with aqueous solution of iron (II) chloride tetrahydrate, polyvinyl pyrrolidone (PVP), and ethanol. Batch adsorption experiments were conducted for the adsorption of As (III) onto the composite. The effects of pH, adsorbent dosage, and contact time on the arsenic adsorption were studied. The result showed that the composite could remove the arsenic from the water far more effectively than the plain AC. The highest percentage of arsenic removal was found at pH at 8, adsorbent dose of 1.8 g/L, and contact time of 60 min. Langmuir and Freundlich adsorption isotherm was used to analyze the equilibrium experimental data. Langmuir model showed the best fit compared to the Freundlich model with a maximal capacity of 6.69 mg/g. These findings indicated that magnetic Fe3O4/sugarcane bagasse AC composite could be potentially applied for adsorptive removal of arsenic (III) from aqueous solutions.

Kinetic and Isotherm Study of As(III) Removal from Aqueous Solution by PET Track-Etched Membranes Loaded with Copper Microtubes

“…Although the time required to reach the equilibrium sorption is slightly longer in oxidized PET (360 min) compared with the pristine counterpart (300 min), this is far from a problem given the high amount of equilibrium adsorption obtained. The relative distribution of As(III) species and the ionization of functional groups on the adsorbent surface depend on the pH of the solution [53,54]. When the effect of pH on As(III) sorption was examined, it was found that the maximum sorption capacity was obtained at pH 4 (Figure 4).…”

“…When the effect of pH on As(III) sorption was examined, it was found that the maximum sorption capacity was obtained at pH 4 (Figure 4). The relative distribution of As(III) species and the ionization of functional groups on the adsorbent surface depend on the pH of the solution [53,54]. When the effect of pH on As(III) sorption was examined, it was found that the maximum sorption capacity was obtained at pH 4 (Figure 4).…”

Three-dimensional, printed water-filtration system for economical, on-site arsenic removal

“…At this point, we need to compare our results with the results for previously reported filters. Indeed, various adsorbents have been used to remove As (III) [47][48][49][50][51]. As can be seen in Table 1, the iron (III) oxide used as an absorbent in the 3D, printed PLA filter in this study showed superior performance with a higher maximum adsorption capacity of As (III) than the adsorbents used in the previously reported studies.…”

Cadmium Removal from Synthetic Wastewater using Seed Biomass Biosorbent: A Bench-top Reactor Investigation

“…Isotherm coefficient (L/mg) of adsorption of cadmium were bo=0.0038 (JP) and bo=0.0048 (AT) for Langmuir were whereas for Freundlich model Kf was 2.98(L g −1 ) for JP and 2.63(L g −1 ) for AT. For the Temkin model constants were bT = 3140.30 (J mol −1 ), KT= 47.47(L g −1 ) for AT and bT = 3205.37 (J mol −1 ), KT= 4.27 (L g −1 ) JP, respectively [Yao et al 2014;Joshi et al 2019;Idreeset al 2018]. The calculated qm values that reflect the adsorption of cadmium on the JP and AT adsorbent for Langmuir isotherm 3191.50 mg/g and 1886.80 mg/g, respectively, which are veryclose to the experiment results and much higher than previously reported biomaterials given in Table 3.…”