Highly Efficient Removal for Methylene Blue and Cu²⁺ onto UiO-66 Metal–Organic Framework/Carboxylated Graphene Oxide-Incorporated Sodium Alginate Beads

Abstract

Herein, we report a new metal–organic framework (MOF)-based composite beads adsorbent made via incorporating UiO-66 MOF, carboxylated graphene oxide (GOCOOH) into sodium alginate for efficient removal of methylene blue dye, and Cu 2+ ions. The successful fabrication of the synthesized UiO-66/GOCOOH@SA composite beads was confirmed by means of X-ray diffraction, Fourier transform infrared, scanning electron microscopy, zeta potential, X-ray photoelectron spectroscopy analysis, and thermogravimetric analysis and BET measurement. The incorporation of both UiO-66 and GOCOOH into SA beads greatly increased their adsorption efficiency for the removal of both MB and Cu 2+ with maximum adsorption capacities of 490.72 and 343.49 mg/g, respectively. The removal process of both MB and Cu 2+ follows the pseudo-second-order model and Freundlich isotherm model. A plausible adsorption mechanism was discussed in detail. Regeneration tests clarified that the removal efficiencies toward both MB and Cu 2+ remained higher than 87% after five cycles. These results reveal the potentiality of UiO-66/GOCOOH@SA beads as an excellent adsorbent.

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

“…The adsorption capacity rapidly increased when the initial concentration changed from 100 to 500 mg/L and reached the maximum adsorption capacity in the range of 600-700 mg/L. This aspect can be attributed to an increase in the driving force of Cu 2+ ion toward the surface of synthesized material [41].…”

Recent developments in alginate-based adsorbents for removing phosphate ions from wastewater: a review

“…Owing to the exceptional structural and physical properties, availability, biocompatibility, and biodegradability of biopolymers, they represent a highly promising choice for the generation of sustainable materials with enhanced adsorption behavior. 54–57 Consequently, biopolymer-based adsorbents have exhibited fabulous adsorption behavior not only toward phosphates but also toward a wide variety of noxious contaminants, including pharmaceuticals, 51 hydrocarbons, 58 pesticides, 59 fluoride, 60 nitrate, 61 heavy metals, 62,63 dyes 64 and nitro-aromatic compounds. 65 Amongst these brilliant biopolymers, anionic alginate (Alg) is a collective family produced from algae and bacteria at a comparatively low cost.…”

Structural analysis and dye removal behavior of amorphous titania embedded poly(vinyl butyral) hybrid fiber

“…Synthetic dyes are considered the most perilous type of pollutant, posing a threat to both human health and aquatic life. 1 Among them, methylene blue (MB) has a planar structure and is highly soluble in water. As a result, it may damage marine life due to hindering the entrance of sunlight into water bodies, and reoxygenation of the marine system is interrupted.…”

“…As a porous material, metal–organic frameworks (MOFs) represent diverse applications in wastewater treatment, generated from organic–inorganic hybrids. 1 Recently, MOF-based composites, such as MIL-101(Fe)@PDopa@Fe 3 O 4 , Fe 3 O 4 /MIL-101(Fe), α-Fe 2 O 3 @UiO-66, and BiOI@UIO-66(NH 2 )@g-C 3 N 4 , have been developed to establish the efficacy of MOFs in this field. 4 In addition, carbon-based materials, especially graphene oxide and reduced graphene oxide, have shown promising results as photocatalysts in dye degradation.…”