Cr(vi) removal by combined redox reactions and adsorption using pectin-stabilized nanoscale zero-valent iron for simulated chromium contaminated water

Abstract

11The synthetic pectin-stabilized nanoscale zero-valent iron was used to remove Cr(Ⅵ) 12 from simulated chromium contaminated water. The Cr(Ⅵ) removal data were well 13 fitted with the pseudo-first order kinetic equation. The observed pseudo-first order 14 rate constant for Cr(Ⅵ) removal decreased from 0.0781 to 0.0413 min -1 when pH 15 increased from 3 to 9. When initial Cr(Ⅵ) concentration increased from 20 to 80 16 mg/L, the observed pseudo-first order rate constant decreased from 0.0645 to 0.0366 17 min -1 . The Cr(Ⅵ) removal efficiency had obvious increases with the dose of 18 pectin-stabilized nZVI increased from 0.02 to 0.10 g, and it increased from 0.0276 to 19 0.1159 min -1 with temperature increased from 15 to 35 °C. The scanning electron 20 microscope (SEM) images proved that the presence of pectin successfully stabilized 21 the nZVI particles and thus increased the BET specific surface area of nZVI. Fourier

Tree gum-based renewable materials: Sustainable applications in nanotechnology, biomedical and environmental fields

“…Thickener, stabilizer, gelling agent, emulsifier (Williams et al, 2011) cell delivery (Munarin et al, 2012) tissue engineering and regenerative medicine (Neves et al, 2015) -Cr (VI) removal from contaminated water (Chen et al, 2015) removal of cationic and anionic dyes (Attallah et al, 2016) photocatalytic applications (A. J. Wang et al, 2012) Agar Red seaweeds (Gelidium species)…”

Improvement of zero valent iron nanoparticles by ultrasound-assisted synthesis, study of Cr(VI) removal and application for the treatment of metal surface processing wastewater

“…This demonstates the presence of mesoporous pores (2 nm <Ø<50 nm) in which nitrogen liquid is condensed at 77 K. The BET specific surface areas (SBET) of the Fe 0 , Fe 0 -UB and Fe 0 -CHR prepared nanoparticles are 22 m 2 .g -1 , 99 m 2 .g -1 and 145 m 2 .g -1 , respectively. For comparison, SBET values given in the literature are between 20 m 2 .g -1 and 50 m 2 .g -1 for iron nanoparticles prepared in silent conditions [44,[53][54][55].…”

Investigation the Effects of Green-Synthesized Copper Nanoparticles on the Performance of Activated Carbon-Chitosan-Alginate for the Removal of Cr(VI) from Aqueous Solution

“…Cr(VI) is considered harmful to humans when its concentration exceeds 0.05 mg·L −1 in drinking water [ 7 ]. Consequently, it is necessary to eliminate Cr(VI) anions from contaminated water [ 8 ]. Adsorption, chemical precipitation, biological reduction; ion exchange and adsorption are treatment processes that have been studied for Cr(VI) elimination [ 9 , 10 , 11 ].…”