The adsorption and reduction of anionic Cr(VI) in groundwater by novel iron carbide loaded on N-doped carbon nanotubes: Effects of Fe-confinement

Study on the Pyrolysis and Adsorption Behavior of Activated Carbon Derived from Waste Polyester Textiles with Different Metal Salts

“…This could be explained by the metal standard reduction potential. The values for the standard reduction potential of Fe 3+ /Fe 2+ (+0.77 V), Fe 2+ /Fe 0 (−0.44 V), Cu 2+ /Cu 0 (+0.34 V), and Zn 2+ /Zn 0 (−0.76 V) were less positive than that of Cr 6+ /Cr 3+ (+1.51 V), which indicated that Fe 0 , Fe 2+ , Cu 0 , and Zn 0 can reduce Cr(VI) to form Cr(III) [ 55 ]. As shown in Figure S1c , the peaks near 284.8 eV, 286.0 eV, and 290.0 eV could be associated with the C−C bond, the C−O bond, and the C=O bond [ 54 ].…”

Efficient removal of Cr(VI) contaminant using recoverable silica from volcanic ash as natural adsorbent: Synthesis and activity in the mechanism and kinetic adsorption

“…It has been known that the existence Cr(VI) in water is feasible due to the more soluble and mobile character of the anion, thus it is easy to enter the tissues of living organism [ 5 ]. The effects of Cr(VI) on human health are found to be toxic and carcinogenic [ 6 , 7 ]. It also affects chronic diseases in several parts such as kidney, skin, liver, and nervous system [ 3 ].…”

“…Several methods to minimize concentration level of Cr(VI) anionic in wastewater have been reported that include photocatalytic reduction [ 9 , 10 ], precipitation [ 11 , 12 ], and adsorption [ 6 , 13 ]. Among them, adsorption has been shown as an alternative economic-less and efficient method for removal of metal ions [ [14] , [15] , [16] ].…”

Aluminum-Porphyrin Metal–Organic Frameworks for Visible-Light Photocatalytic and Sonophotocatalytic Cr(VI) Reduction

“…Heavy metals are an important class of industrial raw materials, while at the same time, they are a kind of undeniably sources of pollution. − Among numerous heavy metal pollutants, chromium (Cr) is one of the most common water pollutants, where the accidental ingestion or prolonged exposure of Cr may cause bronchitis, tuberculosis, diarrhea, or dermatitis. Cr in water was mainly presented in two oxidation state, Cr­(VI) and Cr­(III) . Cr­(VI) mainly comes from the wastewater of industrial manufacturing processes such as paint manufacturing and leather manufacturing. , The toxicity, fluidity, and solubility of Cr­(VI) are much higher than Cr­(III). , It is worth noting that Cr­(III) can be precipitated and collected at pH ≥ 4.…”

“…Cr in water was mainly presented in two oxidation state, Cr(VI) and Cr(III). 4 Cr(VI) mainly comes from the wastewater of industrial manufacturing processes such as paint manufacturing and leather manufacturing. 5,6 The toxicity, fluidity, and solubility of Cr(VI) are much higher than Cr(III).…”