Al-doped C-A-S-H gel

Pb(II) fixation in high alkalinity

Al doping increases specific surface area and pore volume, immobilizing Pb(II) via chemisorption into Si-O-Pb/Al-O-Pb bonds.

Zhang, Xiong · Wang, Baomin · Chang, Jun

Chemical Engineering Journal 2024

Advantages

Al doping increases specific surface area and cumulative pore volume, slightly decreasing average pore size

Adsorption is mainly chemisorption and spontaneous

Higher interlayer water content in low Ca/Si and Al/Si C-A-S-H facilitates ion exchange

After adsorption, aluminosilicate tetrahedra chain length increases while interlayer water content decreases