Efficient Adsorptive Removal of Toxic Amaranth Dye from Water using a Zeolitic Imidazolate Framework

Abstract

Adsorbents reported to remove a toxic acidic azo dye, Amaranth (AMR) are very limited, and their typical adsorption capacities are quite low. Recently, a zeolitic imidazolate framework (ZIF-67) has been proposed as a novel adsorbent as ZIF-67 possesses high surface area, superior chemical stability in water and positive charges, making it a promising adsorbent for AMR. Nevertheless, no studies have been conducted to investigate the adsorption of AMR to ZIF-67. Herein, ZIF-67 is employed for the first time to remove AMR from water via adsorption. Adsorption behaviors are investigated via determining the adsorption kinetics and isotherm. ZIF-67 also exhibits a significant higher maximum adsorption capacity (qmax = 121 mg g-1 at 30 °C) than most of the reported adsorbents. ZIF-67 can be also regenerated by washing it with NaCl solutions and the regeneration efficiency remains effective over multiple cycles, demonstrating that ZIF-67 is a promising adsorbent for AMR.

Facile Fabrication of Porous Adsorbent with Multiple Amine Groups for Efficient and Selective Removal of Amaranth and Tartrazine Dyes from Water

“…Based on the Langmuir isotherm model, the determined maximum adsorption capacities (Q max ) for ARPA with respect to ART and TTZ dyes are found to be 675.68 mg g −1 and 534.76 mg g −1 , respectively. These values are notably superior when compared with a variety of other reported adsorbents (Table 4), such as the zeolitic imidazolate framework (121 mg g −1 for ART) [56], chitosan/bentonite composite (362.1 mg g −1 for ART) [27], and aminated magnetic polymeric resin (297 mg g −1 for TTZ) [57]. This comparison highlights the exceptional adsorptive performance of ARPA.…”

Continuous biosorption of acid red 27 azo dye by Eichhornia crassipes leaves in a packed-bed column

“…Different approaches have been developed to achieve efficient removal of pollutants from industrial effluents, such as adsorption 15 , 16 , biosorption 17 , 18 , photocatalytic degradation 19 , 20 , reverse osmosis, nanofiltration 8 , 21 , ion exchange 8 , chemical oxidation 21 , 22 , chemical precipitation, coagulation, and biodegradation 21 . Conventional biological methods for the treatment of dye-contaminated wastewaters are not effective for the removal of dyes 21 and can generate secondary products, which are far more toxic than the dye itself 23 , 24 .…”

“…AR27 adsorption/biosorption studies have only been conducted in batch systems using activated carbon prepared from coconut husk fiber, commercial activated carbon 19 , Eichhornia crassipes 13 , 25 , zeolitic imidazolate framework 22 , surfactant modified dull pink clay 8 , activated carbon web prepared from acrylic fibrous waste 26 , Pisum sativum peel, Arachis hypogaea shell 27 , and nanoparticles 28 as adsorbents/biosorbents. Batch systems are useful for the treatment of small volumes of effluents, and for determining the maximum dye adsorption/biosorption capacity of the adsorbent and effectiveness of the dye removal process in aqueous solutions 29 , 30 .…”