Adsorption of nitrophenol onto a novel Fe3O4-κ-carrageenan/MIL-125(Ti) composite: process optimization, isotherms, kinetics, and mechanism

Abstract

Water pollution is a dreadful affair that has incessantly aggravated, exposing our planet to danger. In particular, the persistent nitro aromatic compound like nitrophenols causes anxiety to the researchers due to their hazardous impacts, excessive usage, and removal difficulty. For this purpose, a novel multi-featured composite was constructed based on κ-Carrageenan (κ-Carr), MOF (MIL-125(Ti)), and magnetic Fe3O4 for efficient adsorptive removal of o-nitrophenol (o-NP). Interestingly, BET measurements revealed the high surface area of Fe3O4-κ-Carr/MIL-125(Ti) of about 163.27 m2/g, while VSM showed its excellent magnetic property (20.34 emu/g). The comparison study pointed out the synergistic effect between Fe3O4, κ-Carr, and MIL-125(Ti), forming a composite with an excellent adsorption performance toward o-NP. The adsorption data obeyed pseudo-second-order kinetic model, and Freundlich isotherm model was better fitted than Langmuir and Temkin. Furthermore, Langmuir verified the supreme adsorption capacity of o-NP onto Fe3O4-κ-Carr/MIL-125(Ti) since the computed qmax reached 320.26 mg/g at pH 6 and 25 °C. Furthermore, the XPS results postulated that the adsorption mechanism pf o-NP proceeded via H-bonding, π-π interaction, and electron donor–acceptor interactions. Interestingly, Fe3O4-κ-Carr/MIL-125(Ti) composite retained good adsorption characteristics after reusing for five cycles, suggesting its viable applicability as an efficient, renewable, and easy-separable adsorbent for removing nitro aromatic pollutants.

Treatment of oilfield wastewater and synthesis of Na2FeO3 in a chloride ion anode oxidation system

“…3. The IR peaks at wave numbers around 809 cm −1 were attributed to ferrate-specific stretching frequencies, 9,10 the characteristic peaks associated with the stretching vibrations of Fe-O bonds were observed at 560 cm −1 , [11][12][13] and the IR peaks at 1356 and 1107 cm −1 correspond to the chloride and sulfate, respectively. These results confirm that the synthesized product was ferrate.…”

Hierarchically Porous Mg-MOF-74/Sodium Alginate Composite Aerogel for CO2 Capture

“…Metal–organic frameworks (MOFs) are among the most appealing solid adsorbents, with remarkable and diverse structural properties such as large specific surface area, adjustable internal active center and window size, excellent mechanical/thermal stability, and broad application prospects in adsorption separation, catalysis, water pollution treatment, etc. − MOF pores range in size from a few angstroms to nanometers, making them ideal for the adsorption and separation of small guest molecules such as gas molecules, small chemical molecules, and coordination complexes . In particular, MOFs show great advantages in CO 2 capture because of their inherent metal active centers, which exhibit high affinity and selectivity for CO 2 molecules.…”

Facile Synthesis of a Magnetic Glucose-Based Hyper-Cross-Linked Polymer by Dual-Role Ferric Chloride for Nitrophenol Removal from Sewage

“…Therefore, to reduce the risk of possible health problems, the United States has listed p -nitrophenol (PNP), DNP, and other nitrophenols as priority pollutants. − A series of related researches have determined that the most effective strategy for treating nitrophenols is adsorption using porous materials, which does not produce any additional toxic metabolites. To date, many fascinating materials have been utilized for nitrophenol removal, such as activated carbons, , zeolites, , graphene oxides, , ionic liquids, , metal–organic frameworks, , and covalent organic frameworks. , However, carbon-based materials rely on a single interaction force and have poor structural regulation. Metal coordination bond-based organic skeleton materials have poor moisture resistance.…”

“…4−6 A series of related researches have determined that the most effective strategy for treating nitrophenols is adsorption using porous materials, which does not produce any additional toxic metabolites. To date, many fascinating materials have been utilized for nitrophenol removal, such as activated carbons, 7,8 zeolites, 9,10 graphene oxides, 11,12 ionic liquids, 13,14 metal−organic frameworks, 15,16 and covalent organic frameworks. 17,18 However, carbon-based materials rely on a single interaction force and have poor structural regulation.…”