Synthesis of α-Fe2O3 nanofibers for applications in removal and recovery of Cr(VI) from wastewater

Abstract

The as-prepared α-Fe(2)O(3) nanofibers can be utilized as efficient low-cost nano-absorbents for removal and recovery of Cr(VI) from wastewater.

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

“…Combination of various biopolymers with hematite is of high interest to scientists in over a range of fields [58], from the development of advanced drug carriers [59], targeted magnetic resonance imaging of tumors [60] to biosensors [56,61] supercapacitors [62], adsorbents [63,64] and catalysts for chemical reactions [65]. Several studies regarding the use of biological templates in hydrothermal synthesis of hematite have been performed.…”

Synthesis and optimization of Fe2O3 nanofibers for chromate adsorption from contaminated water sources

“…where c e is the equilibrium concentration of CrO 4 2À in mg/L, q e is equilibrium adsorption capacity of CrO 4 2À on Fe 2 O 3 in mg/g, q m is the maximum adsorption capacity in mg/g, and b is the Langmuir equilibrium constant in L/mg (Ren et al, 2013). The equation can be modified to linearize the adsorption isotherm curve and yield a Fig.…”

“…However, exposure to these contaminants continues around the world and increasingly in developing countries (Jarup, 2003). Chromium (Cr), an example of a carcinogenic heavy metal, is very common in diverse metal industry processes, such as electroplating, leather tanning, wood preservations and chemical industries (Chowdhury and Yanful, 2010;Ren et al, 2013). It has been reported that occurrences of Cr entering the environment are due to leakage, poor storage or unsafe disposal practices from such metal industry processes (Chowdhury and Yanful, 2010).…”

“…Normally, iron(III) nitrate (Fe(NO 3 ) 3 ) is the popular iron precursor of choice during electrospinning, but precursors such as iron(II) acetate (FeAc 2 ) and iron(III) 2-ethylhexanoate diispropoxide (C 14 H 29 FeO 4 ) have also been used (Crane and Scott, 2012;Li et al, 2003;Zhu et al, 2006). Despite the large amount of research surrounding Fe 2 O 3 nanofibers, the average diameter of these nanofibers is relatively large (100e300 nm) (Crane and Scott, 2012;Eid et al, 2010;Zheng et al, 2009) and there is very little work on Fe 2 O 3 nanofibers used for heavy metal adsorption (Ren et al, 2013). The nanofiber dimensions will be heavily exploited to take advantage of the greater surface area-to-volume ratio compared to that of nanoparticles and larger sized nanofibers, where surface adsorption can be optimized.…”

Development of novel α-Fe2O3/NiTiO3 heterojunction nanofibers material with enhanced visible-light photocatalytic performance

“…Meanwhile, nickel titanate is reported to be highly stable in oxidizing environment with visible light illumination which is crucial for the photocatalysis application [22,23] a-Fe 2 O 3 nanofibers were synthesized via a facile low temperature hydrothermal route followed by calcination in ambient air atmosphere [24]. A defined quantity of FeCl 3 Á6H 2 O (16 mmol) was dissolved in 112 mL deionised water to form a clear solution.…”