Mesoporous Iron-Manganese Magnetic Bimetal Oxide for Efficient Removal of Cr(VI) from Synthetic Aqueous Solution

Abstract

A facile co-precipitation method was established for synthesis of mesoporous iron-manganese magnetic bimetal oxide (MIMO) and its adsorption property was studied for removal of toxic metal ion hexavalent chromium from aqueous solution. XRD pattern of MIMO confirms the existence of Fe2O3 and Mn3O4 particle, out of which Mn3O4 is ferrimagnetic in nature. Synthesized MIMO has shown high saturation magnetization (23.08 emu/g), high BET surface area (178.27 m2/g) and high pore volume (0.484 cm3/g), which makes it a potential adsorbent. Adsorption process followed second order kinetic and Langmuir isotherm model. Involvement of intra-particle diffusion is also confirmed from kinetic data, which can be attributed to the mesoporous nature of the MIMO. Cr(VI) adsorption shows high pH dependency and maximum adsorption capacity of 116.25 mg/g is reported at pH 2.0. Electrostatic attraction between anionic chromium species and protonated MIMO surface is the predominant mechanism in this adsorption process.

Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

“…From the time of contact, it can be concluded that the absorption rate initially increased and then equilibrated (Wu et al 2019). Due to a larger number of active sites, the structure and area of the adsorbent are faster in the early times and allow heavy metal to penetrate to a large extent (Bhowmik et al 2018;Davarnejad et al 2018). Other researchers reported similar results for adsorption of chromium by different adsorbents (Theydan 2018;Jamshidifard et al 2019;Li et al 2019).…”

Separation of TiO2 and Fe2O3 from Indonesia Ilmenite Minerals and their Application as Photocatalysts for Eriochrome Black‐T Dye Degradation

“…In recent decades, almost 10-15 % of dyes from dyeing process units have entered the aquatic environment through industrial waste. [1] Organic dyes are colored compounds that are widely used in the manufacture of textiles, leather, paints, clothing, rubber, biological imaging, plastic paper making, food processing, etc. The side effects of this dye liquid waste are environmental problems, including decreased water quality, damage to soil productivity, and health problems in the environment around polluted areas.…”

Hydrodynamic parameters when filtering chromium-containing wastewater through a layer of fibrous waste

“…Typically, such a process necessitates the use of a large volume of chemical reagents, or reductants. An alternative method of recovery that does not require the use of reagents is the galvanocoagulation method [7][8][9][10][11][12]. The ecological advantage of this approach is the possibility of joint disposal of various metalworking wastes or other industries [13].…”