Fixed-bed system for adsorption of anionic acid dyes from binary solution onto quaternized kenaf core fiber

Abstract

Water pollution due to the effluents from textile industries causes serious concern around the world. During the coloration process, the excess synthetic dyes are discharged into the wastewater stream. In the present research, kenaf core fiber (KCF) residue was chemically modified with (3-chloro-2-hydroxypropyl) trimethylammonium chloride (CHPTAC) to alter the surface properties and increase the surface area to develop more active sites that capture anionic dyes from aqueous solution. Fixed-bed adsorption studies were conducted to investigate the performance of using quartenized kenaf core fiber (QKCF) as an adsorbent for the removal of anionic acid dyes from a binary system. The effects of operational parameters, including inlet dye concentration, flow rate, and bed height, were studied in a fixed-bed column system, while other process parameters were fixed, i.e. pH and temperature at 7.5 and 27 ºC, respectively. The fixed-bed column performed better with lower influent dye concentration, less flow rate of the influent, and a higher adsorbent bed depth. Overall, the present study showed that QKCF is a potential adsorbent for anionic dye removal from aqueous solutions in a fixed-bed column system.

Dynamic Adsorption of a Cationic Dye onto Wool Fibers as Column-Filling Media: Response Surface Optimization and Fixed-Bed Adsorption Modeling

“…For greater operating times (up to achieving the saturation point), the column might be included in a system of adsorption columns connected consecutively. It should be noted herein that for industrial applications the adsorbent column is usually replaced when the relative concentration C t /C 0 is equal to value 0.5, that is, 50% breakthrough is attained [39]. For our application (wool fibers/BB9), the relative concentration of 0.5 (i.e., 50% breakthrough) was achieved after 780 min contact time, operating at the inlet flow rate of 3.0 mL/min.…”

“…In our study involving coarse wool fibers loaded with BB9 dye, the results of adsorption performance under batch conditions fall somewhere in the middle when compared to findings from other studies listed in Table 4. Regarding fixed-bed adsorption, fibrous materials, other than wool, had been reported for the retention of dyes, such as amino-modified cotton fibers [37], bagasse treated with tartaric acid [38], and chemically modified kenaf core fibers [39] (see Table 4). For fibrous materials like modified cotton [37], it was observed that the adsorption capacity was less for fixed-bed adsorption when compared to batch adsorption for the same system.…”

Peanut Shell as a Natural Adsorbent for the Removal of Acid Blue 25 from Aqueous Solution

“…Its chemical structure is described in Fig. 2, and the physicochemical properties are given in Table 1 (Idan et al, 2017).…”

“…Many of these dyes, especially organic ones, can be toxic, carcinogenic, mutagenic, and may affect aquatic life (Idan et al, 2017).…”