Modified bentonites as adsorbents of hydrogen sulfide gases

Chemical trapping of gaseous H 2 S at high and low partial pressures by an iron complex immobilized inside the montmorillonite interlayer

“…Modified clays. Stepova et al [42] used a carbonate-rich montmorillonite modified by iron and copper metal oxides to remove H 2 S in low-concentrated exhausted gases. Fe-modified montmorillonite shows significant H 2 S removal capacity, although its adsorption capability steadily decreased after each adsorption-regeneration cycle reaching exhaustion after about 20 cycles.…”

The role of thermal analysis in the development of high-iron-content kaolinite-based photocatalysts

“…Depending on the strength of acidic treatment and on the origin of kaolin, acid treatment can partially destruct the silicate backbone. It is proved, however, that HCl has no destructive effect [30]. On the other hand, the OH groups can be protonated at the surfaces and at the edges after acidic treatment and a cation exchange can occur (replacement of Al by Fe in the octahedra).…”

Valorization of calcium carbonate-based solid wastes for the treatment of hydrogen sulfide in a semi-continuous reactor: Part II – Slurry bubble column pilot

“…Methods for H 2 S removal from the gas phase have been developed for years and can be classified into three main categories: adsorption [10][11][12][13][14][15][16], absorption [17][18][19][20][21][22] and biological treatment [23][24][25][26][27][28]. These methods have been deployed at large industrial scale [29,30], but they still need improvement to reduce cost and to increase performance.…”