Metal oxides have been frequently used in conjunction with CNTs and offer two advantages.
First, they can aid in adsorption, such as the coating of aluminium oxide on CNTs that resulted
in a multifunctional membrane that can remove heavy metal (Cd(II)) ions as well as TCE through
preferential electrostatic affinity Second, they produce OH radicals that can be used in advanced
oxidation processes, which are Fenton like reactions that take place in a broad range of pH
values Such versatility means choice of CNTs and metal oxides can produce a combinatorial
solution to specific effluent remediation. The case of aluminium oxide, and the resulting interactions
that contribute to remediation are shown in Figure