Removal of organic contaminants from wastewater with GO/MOFs composites

Abstract

Graphene oxide/metal-organic frameworks (GO/MOFs) have been prepared via solvothermal synthesis with ferrous sulfate heptahydrate, zirconium acetate and terephthalic acid for the purpose of removing organic pollutants from wastewater. The composites were analyzed using scanning electron microscopy, infrared spectrometry, and XRD. Tetracycline hydrochloride and orange II were implemented as model pollutants to evaluate the efficacy of the GO/MOFs in water purification, in which 50 mg of Zr/Fe-MOFs/GO was mixed with 100 mL of 10 mg/L, 20 mg/L, 30 mg/L, or 50 mg/L tetracycline hydrochloride solution and 25 mg/L, 35 mg/L, 45 mg/L, or 60 mg/L orange II solution, respectively. The removal efficacy after 4 hours was determined to be 96.1%, 75.8%, 55.4%, and 30.1%, and 98.8%, 91.9%, 71.1%, and 66.2%, respectively. The kinetics of pollutant removal was investigated for both tetracycline hydrochloride and orange II and excellent correlation coefficients of greater than 0.99 were obtained. The high efficacy of these MOFs in pollutant removal, coupled with their inexpensive preparation indicates the feasibility of their implementation in strategies for treating waste liquid. As such, it is anticipated that Zr/Fe-MOFs/GO composites will be widely applied in wastewater purification.

Synthesis of MOFs for RhB Adsorption from Wastewater

“…3, the Fe-MOF material can be divided into three stages: (1) a mass loss (14.4%) between 20 • C and 300 • C, which could be attributed to evaporation of residual solvents from the sample; (2) a mass loss of 40% between 301 • C and 509 • C, mainly due to the oxidation of the metal ion [29]; (3) a mass loss leaving a residual amount of 33.9% of the original mass, which begins at 610 • C, corresponding to the destruction of the framework structure. This result indicated that the material was stable below 410 • C. In most cases, MOFs generated via synthetic reactions between metal ions and organic ligands have a more stable structure [30].…”

“…The removal ability of Fe-MOFs was evaluated by using RhB as a model pollutant. Different concentrations (10,20,30,40, and 50 ppm) of RhB solutions were prepared. The Fe-MOFs of different masses were added to each solution separately and stirred in natural light.…”

“…This result indicated that the material was stable below 410 °C. In most cases, MOFs generated via synthetic reactions between metal ions and organic ligands have a more stable structure [30]. The concentration of RhB in wastewater and the quality of MOFs were the main factors affecting the removal.…”

Metal-Organic Frameworks for Wastewater Decontamination: Discovering Intellectual Structure and Research Trends

“…The performance enchantment of MOFs, in terms of a high adsorption capacity and water stability, was identified as an emerging topic. To cater to these issues, the application of graphene [ 98 ], graphene oxides [ 99 ], nanoparticles [ 100 ], and quantum dots [ 101 ] was also observed on various research fronts.…”

Preparation of bimetallic metal–organic frameworks for adsorbing doxycycline hydrochloride from wastewater

“…As such, MOFs are promising alternative material candidates. They are widely used for catalysis, 26,27 carbon dioxide capture, 28 antibiotics, 29,30 energy storage, 31 adsorption and separation, [32][33][34] drug delivery, 35 wastewater treatment, [36][37][38][39][40] and other functions [41][42][43][44] due to their diversified structure, higher surface area, tunable functional groups, and permanent pores. Previous studies have shown that most MOFs use a single metal ion, which is limited in the treatment of pollutants, with often poor treatment effects.…”