Fabrication of a low-cost adsorbent supported zero-valent iron by using red mud for removing Pb(ii) and Cr(vi) from aqueous solutions

Abstract

In this study, a granular red mud supported zero-valent iron (ZVI@GRM) was successfully prepared and was used to remove Pb(ii) and Cr(vi) from aqueous solution.

Peroxymonosulfate activation by tea residue biochar loaded with Fe3O4 for the degradation of tetracycline hydrochloride: performance and reaction mechanism

“…5b , the degradation rate of TCH increases sequentially with increasing dosage of Fe 3 O 4 @T-BC. 38 These findings were in good agreement with previous studies that the degradation efficiency of activated persulfate continuously increases because the increase in Fe 3 O 4 @T-BC dosage might provide more SO 4 − ˙ in the activated system to participate and accelerate the degradation of TCH. 39 …”

Synthesis of poly (vinylpyrrolidone)/Fe3O4@SiO2 nanoporous catalyst by γ‐rays and evaluation their sono‐photo‐Fenton degradation of toluidine blue under magnetic field

“…Generally, the H1 hysteresis loop was observed for slit‐shaped pores present on the plate‐like particles which suggest the mesoporous structure of Fe 3 O 4 in the composite. [ 35 , 36 ] In addition, Adsorption isotherms are type IV and this is characteristic of a material that contains mesoporosity and has a high energy of adsorption. [ 37,38 ] As known, mesoporous material is porous material which has dimensions in the range 2–50 nm, and recently the term “nanoporous” has become popular and have attracted much attention over the last years owing to their unique properties, different to their bulk counterparts, which pave the way for their application in different fields.…”

Attenuation of Cr/Pb in bauxite leachates by bentonite–polymer composite geosynthetic clay liners

“…, etc. [7][8][9][10] The pH value is as high as 12 or 13, and large amounts of heavy metal elements are dissolved, and arsenic (As), lead (Pb), zinc (Zn), copper (Cu), nickel (Ni), chromium (Cr), and vanadium (V), [11][12][13][14] usually are at concentrations beyond groundwater quality standards in the United States and China. 6 For example, the concentration of As and Cr in bauxite leachates is 2 to 200 times higher than the maximum contaminant level (MCL) issued by the US Environmental Protection Agency.…”