Degradation of FBL Dye Wastewater by Magnetic Photocatalysts from Scraps

Abstract

Magnetic photocatalyst solves the separation problem between wastewater and TiO2photocatalysts by the application of magnetic field. This research investigates the treatment of simulated FBL dye wastewater using Mn-Zn ferrite/TiO2magnetic photocatalyst. The magnetic Mn-Zn ferrite powder was first produced by a chemical coprecipitation method from spent dry batteries and spent pickling acid solutions. These two scraps comprise the only constituents of Mn-Zn ferrite. The as-synthesized Mn-Zn ferrite was then suspended in a solution containing Ti(SO4)2and urea. Subsequently a magnetic photocatalyst was obtained from the solution by chemical coprecipitation. The prepared Mn-Zn ferrite powder and magnetic photocatalyst (Mn-Zn ferrite/TiO2) were characterized using XRD, EDX, SEM, SQUID, BET, and so forth. The photocatalytic activity of the synthesized magnetic photocatalysts was tested using degradation of FBL dye wastewater. The adsorption and degradation studies by the TOC and ADMI measurement were carried out, respectively. The adsorption isotherm and Langmuir-Hinshelwood kinetic model for the prepared magnetic TiO2were proved to be applicable for the treatment. This research transforms waste into a valuable magnetic photocatalyst.

Magnetic recyclable microcomposite silica-steel core with TiO2 nanocomposite shell photocatalysts for sustainable water purification

“…The measured high mass normalised dye degradation rates equal or exceed previously reported values for magnetically separable micron size photocatalytic particles tested under comparable reaction conditions. 33,34,36,37,40,42 Furthermore, the present magnetically separable photocatalysts are much cheaper, simpler to prepare, and readily scalable. All of these factors make them suitable for local manufacture and adoption in developing countries for sustainable water purification.…”

“…Previous examples for local production include: agglomerated TiO 2 coated sub-micron size iron oxide particles synthesised from ferric chloride (which is toxic), 32,33 handling and disposal of waste sulphuric acid) 34 , the combining TiO 2 particles and a magnetic component within an organic matrix (such as chitosan, 35 poly(methyl methacrylate), 36 or poly(vinyl pyrrolidone)) 37 to form micron-sized particles (these suffer from the organic host matrices themselves being vulnerable to photodegradation by the TiO 2 photocatalysts over extended periods of operation) 38,39 , and the utilisation of inorganic matrices, such as reduced graphene oxide, 40 SrFe 12 O 19 nanofibres, 41 or hydrotalcite clays, 42 ( which add significant costs).…”

A C-Doped TiO2/Fe3O4 Nanocomposite for Photocatalytic Dye Degradation under Natural Sunlight Irradiation

“…Iron oxides are the most common magnetic materials, which are cheap, easy to prepare, strongly magnetic, and environmentally benign [27,28]. Extensive efforts have been made to combine TiO2 photocatalyst with magnetic iron oxide NPs as a feasible strategy to build an effectively stable and easily recoverable composite photocatalyst [29][30][31]. Over the past few years, a number of TiO2-based hybrid photocatalysts with iron oxide-based magnetic materials have been reported, such as TiO2/Fe3O4 [32,33], Ag3PO4/TiO2/Fe3O4 [34], Ni-Zn-ferrite/TiO2 [35], and N-doped TiO2/ZnFe2O4 [36], to improve photocatalytic activity, cycling stability, and long-term durability in the photodegradation of dye pollutants.…”

Effective Heterogeneous Photocatalytic Degradation of Crystal violet Dye using Manganese Ferrite Nanoparticles

“…Currently, heterogeneous photocatalysis with hydrogen peroxide (H 2 O 2 ) in presence of light is an advanced oxidant process (AOP). AOP is a very successful technique to remove toxic contaminant from water [9][10][11][12][13][14][15]. In this method the H 2 O 2 decompose to highly reactive hydroxyl radicals (HO  ) which decolorized the organic dyes in the presence of heterogeneous photocatalyst.…”