Magnetic Carbon Composite Particles for Dye Adsorption from Water and their Electrochemical Regeneration

Abstract

Herein, the development of a novel composite particle system prepared from superparamagnetic Fe3O4@SiO2 microparticles as core and coated with a carbon shell is presented. The coating with carbon is done by pyrolyzing furan resin, which was previously deposited on the particle surface by poly‐merization of furfuryl alcohol. The novel composite material thus combines magnetic and sorptive properties. Upon pyrolysis the magnetic material is converted from magnetite to α‐iron and fayalite, changing its behavior from superparamagnetic to ferromagnetic with nearly zero remanence. The magnetic properties can be utilized to magnetically collect the particles dispersed in fluids, whereas the sorptive properties of the carbon shell can be used to remove organic contaminants from these fluids. The adsorption behavior of the composite particles and a potential electrochemical regeneration route are investigated, using the model dye methylene blue.

Fe3O4@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue

“…Adsorption isotherm experiments were conducted at 25 °C, 35 °C, and 45 °C. Langmuir, Freundlich, Redlich-Peterson, and Temkin models were introduced to describe the adsorption category [ 39 , 40 , 41 ]; expressions are shown as Equations (6)–(9). where k LC and K FC are the Langmuir and Freundlich constant, respectively, K R and a R are the characteristics of the R-P isotherm model, B is the Temkin constant, A is the equilibrium binding constant, and C equ is the MB concentration at adsorption equilibrium.…”

“…The relevance between the equilibrium adsorption capacity of Fe 3 O 4 @C nanoparticles at different adsorption temperatures and the remaining MB concentration was investigated using adsorption isotherms models. Adsorption isotherm experiments were conducted at 25 • C, 35 • C, and 45 • C. Langmuir, Freundlich, Redlich-Peterson, and Temkin models were introduced to describe the adsorption category [39][40][41]; expressions are shown as Equations (6)- (9).…”

Supraparticles for Sustainability

“…For instance, carbon coatings or NPs facilitate effective in situ electrocatalytic or electrochemical regeneration. [ 81,82 ] For electrocatalytic denitrification of lake water, Su et al. prepared carbon‐coated Fe 3 O 4 SPs via self‐assembly of oleic acid capped iron oxide NPs with subsequent carbonization ( Figure a1).…”

Soft-template solvent thermal method synthesis of magnetic mesoporous carbon–silica composite for adsorption of methyl orange from aqueous solution

“…Carbon-based materials, with their particular properties such as controlled pore size distribution, high surface area and manipulatable surface chemistry, have been acknowledged as a promising class of adsorbents which are capable of adsorbing dyes from wastewater (Schneider et al, 2019). In the family of carbon-based materials, activated carbon (AC) is one of the most concerned adsorbents, which has been utilized to remove dyes conventionally.…”