**Chapter 9**

[41] Yang W, Tang Q, Wei J, Ran Y, Chai L, Wang H. Enhanced removal of Cd (II) and Pb (II) by composites of mesoporous carbon stabilized alumina. Applied Surface Science. 2016;369: 215-223. DOI: 10.1016/j.apsusc.2016.

[42] Radi S, El Massaoudi M, Bacquet M Degoutin S, Adarsh NN, Robeyns K, Garcia Y. A novel environment-friendly hybrid material based on a modified silica gel with a bispyrazole derivative for the removal of ZnII, PbII, Cd(II) and Cu(II) traces from aqueous solutions. Inorganic Chemistry Frontiers. 2017;4: 1821-1831. DOI: 10.1039/c7qi00322f

[43] Li M, Li M, Feng C, Zeng Q. Preparation and characterization of multi-carboxyl-functionalized silica gel for removal of Cu (II), Cd (II), Ni (II) and Zn (II) from aqueous solution. Applied Surface Science. 2014;314:

1063-1069. DOI: 10.1016/j. apsusc.2014.06.038

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Water Chemistry

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