Green synthesis of reusable super-paramagnetic diatomite for aqueous nickel (II) removal

Functionalization of Frustules of the Diatom Staurosirella pinnata for Nickel (Ni) Adsorption From Contaminated Aqueous Solutions

“…The data of the functionalized frustules contrasted with previous findings for functionalized diatomite, diatom silica microparticles and a wide range offunctionalized nanocomposites, that, despite the promising heavy metal removal efficiencies, showed a strong pH dependency (Zhang et al, 2015;Wu et al, 2021). For example, magnetic chitosan nanoparticle appears as an efficient and fast tool for removing Pb 2+ from water, with an efficiency close to 100% at acid and neutral pH conditions (Liu et al, 2009), but increasing pH up to 7.0 seemed to affect the lead ion binding by chitosan, thus decreasing its adsorption capacity.…”

“…Diatomite, another alternative adsorbent, is much more comparable to the frustules of S. pinnata (ElSayed, 2018) as it also has high porosity, large surface area and small particle size. Like S. pinnata frustules, raw diatomite, possesses a weak affinity for metal ion binding, and functionalization is also required to enhance their adsorption capacity (Wu et al, 2021). The potential of modified and raw diatomite to remove metals has been widely studied (Khraisheh et al, 2004;Danil de Namor et al, 2012;Kabiri et al, 2015;Nosrati et al, 2017;Zhao et al, 2019;El Ouardi et al, 2020), but there are some inherent problems.…”

Selective adsorption of Hg(ii) with diatomite-based mesoporous materials functionalized by pyrrole–thiophene copolymers: condition optimization, application and mechanism

“…17,18 Owing to the limited hydroxyl functions on mesoporous molecular sieves, resulting in relatively low adsorption capacity for heavy metal ions, especially Hg(II) with large atomic radius. 19 Hence, to the best of our knowledge, surface modication of mesoporous molecular sieves is a greatly effective method to improve their adsorption performance. Furthermore, mesoporous molecular sieve can be used as a good carrier for adsorption and separation reaction owing to its high specic surface area and regular pore structure.…”

Pore structure and surface properties of diatomite with mechanical grinding and its influence on humidity control performance

“…Diatomite contained a small amount of impurities such as quartz, mica and feldspar. Vibration peaks appeared in the bands of 1097cm-1 were the stretching vibration peak of Si-O bond, Vibration peaks appeared in the bands of 800 cm-1 were the stretching vibration peak of symmetric Si-O bond and the deformation vibration peak of Si-O-Si amorphous SiO2 appeared in the bands of 465 cm-1 in the four samples, (Mu et al 2018;Li et al 2019;Wu et al 2021). As the content of SiO2 had not been changed during the grinding process, the strength of the vibration peak of Si-O bond basically remained unchanged.…”