Unveiling the crucial role of iron mineral phase transformation in antimony(V) elimination from natural water

Natural Pyrite-assisted Mechanochemical Recovery of Insoluble Manganese from Electrolytic Manganese Residue: Kinetics and Mechanisms

“…For the fitting results of the Fe 2p XPS spectrum (Figure b), Fe existed in the form of Fe­(II)–S (706.98), jarosite state Fe­(III)–SO 4 (711.78 eV), Fe­(III) (711.78 eV), and Fe­(III) (719.70 eV) in the raw EMR, , and the percentage of these forms in EMR accounted for 1.85, 58.29, 23.71, and 16.15% of the total manganese content, respectively (Table S3). With the addition of pyrite, the amount of Fe­(II)–S species increased to 10.90% and this content would decreased to 1.09% after the ball milling process at 500 rpm due to the high speed of rotation promoting mechanochemical reactions .…”

“…This finding meant that all soluble manganese was leached during low-speed ball milling leaching, whereas most of the MnO 2 was converted after high-speed ball milling with pyrite, verifying the effect of high-speed ball milling on the activation of pyrite and the reductive leaching of Mn(IV)-containing minerals. 17 For the fitting results of the Fe 2p XPS spectrum (Figure 4b), Fe existed in the form of Fe(II)−S (706.98), jarosite state Fe(III)−SO 4 (711.78 eV), Fe(III) (711.78 eV), and Fe(III) (719.70 eV) in the raw EMR, 50,51 and the percentage of these forms in EMR accounted for 1.85, 58.29, 23.71, and 16.15% of the total manganese content, respectively (Table S3). With the addition of pyrite, the amount of Fe(II)−S species increased to 10.90% and this content would decreased to 1.09% after the ball milling process at 500 rpm due to the high speed of rotation promoting mechanochemical reactions.…”

The multiple roles of rare earth elements in the field of photocatalysis

“…Therefore, to efficiently develop and utilize rare earth oxide photocatalysts, they also need to be rationally photocatalytically modified. 119–125 Generally speaking, the modification of rare earth oxide photocatalysts is similar to that of other catalysts, which mainly includes two aspects: broadening the light absorption range of photocatalysts and improving the separation efficiency of photogenerated carriers. Among them, broadening the light absorption range of photocatalysts is mainly realized by metal ion doping.…”

Epidermal microorganisms contributed to the toxic mechanism of nZVI and TCEP in earthworms by robbing metal elements and nutrients

“…Essentially, when contaminants induce host toxicity by disrupting symbiotic microorganisms, the final effects depend on the community changes of symbiotic microorganisms along with their functions. Certain microorganisms may strengthen or weaken the resistance of the host to external pollutants by modulating nutrient cycling, absorption of essential elements, and pollutant metabolism [ [8] , [9] , [10] , [11] ]. For example, intestinal microbes have been observed to affect host nutrient cycling through the synthesis of vitamins, short-chain fatty acids, and various gut hormones [ 8 ].…”