Hierarchical Fe₃O₄‐derived organic/inorganic hybrids constructed by modified bio‐inspired functionalization: efficient adsorbents for water‐soluble methylene blue and mechanism

Abstract

Background The development of efficient and sustainable adsorbents is still a challenge for dye removal in practical applications. Here a method to prepare hierarchical Fe3O4‐derived organic/inorganic hybrid adsorbents for methylene blue removal is demonstrated. Typically, two different structured magnetic nanoparticles were synthesized through solvothermal route and chemical co‐precipitation (named as S‐Fe3O4 and C‐Fe3O4 respectively), which were further functionalized by a novel modified mussel‐inspired method with dopamine (DA) and (3‐aminopropyl)triethoxysilane (KH550), thus obtaining core‐shell Fe3O4/poly(DA + KH550) adsorbents. Results The effects of microstructure, morphology and surface functionalization on the adsorption performance of core‐shell Fe3O4 adsorbents were systematically investigated, thus achieving target structurally optimized core‐shell Fe3O4 adsorbents. Especially, the maximum adsorption capacity of core‐shell S‐Fe3O4/poly(DA + KH550) adsorbent reached 400.00 mg g−1 because of high specific surface area and abundant active adsorption sites. In addition, the adsorption kinetics and adsorption isotherm fitted a pseudo‐second‐order model and Langmuir model respectively. Conclusion The recycling process of adsorbent is sustainable in economy and energy by applying an external permanent magnet. In summary, the high adsorption capacity, easy separation and excellent reusability of S‐Fe3O4/poly(DA + KH550) core‐shell adsorbents make them promising for dye effluent removal. © 2019 Society of Chemical Industry

Construction of Z‐scheme Pt‐TiO2/(Er3+:Y3Al5O12@Ta2O5)/HAP and its application in sonocatalytic degradation of prometryn and disinfection of Escherichia coli

“…(b) appear at 24.5 and 26.5 eV, which are ascribed to the binding energies of Ta (4f 7/2 ) and Ta (4f 5/2 ), respectively. It can be demonstrated that the Ta 2 O 5 has been successfully synthesized . Figure (c) shows the spectrum of Ti.…”

Promoting the stability and adsorptive capacity of Fe3O4-embedded expanded graphite with an aminopropyltriethoxysilane–polydopamine coating for the removal of copper(ii) from water

“…11 The Fe 2p 1 and Fe 2p 3 peaks of the GFA were clearly weaker than the peak of the EGF. Meanwhile, the peaks of N 1s, C-Si (282.4 eV) 52 and C-N, as well as a Fe 2p intensity reduction, were also observed in the total spectrum and the C 1s spectrum of the GFA + KH550 (Fig. S1e and f †).…”

“…S1a †). 11,12,52 The C 1s core-level spectrum of the EGF was divided into four peak components: C-C (284.6 eV), C-O (286.6 eV), C]O (288.4 eV), and O-C]O (290.3 eV) (Fig. S1b †).…”

“…2). 52 The HI was used to further illustrate the Cu(II)-removal efficiency. For non-carcinogenic risk assessment, with the initial Cu(II) concentration of 15.1 AE 0.1 mg L À1 , the HI value of Cu for adults was 3974 AE 26, as calculated using eqn (3) and ( 4).…”

A novel silica xerogel synthesized from volcanic tuff as an adsorbent for high‐efficient removal of methylene blue: parameter optimization using Taguchi experimental design

“…Owing to rapid industrialization and population growth the release of considerable amounts of dyes from many industries such as textile, leather, paper, plastic, printing, rubber, cosmetic and food processing plants into waters results in serious water pollution. 1,2 Accumulation of dyes in water causes not only contamination, but also adverse impacts on human health. 3,4 Methylene blue (MB) with unfavorable properties is a cationic dye widely used in many industrial applications.…”