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Besides, for successful mineralization high concentration
of iron (50–80 ppm) is required, which is well above the
permissible limit (2 ppm)of Fe concentration in the treated water to
be dumped directly to the environment [14–17]. To overcome these
limitations, serious attention has been focused on the development
of heterogeneous Fenton-like catalysts such as Fe-containing
zeolites and clays [18–20]. Recently, Fe-containing mesoporous
materials have attracted much attention because of their high surface
area and uniform pore size distribution. In literature it has been
reported that heterogeneous zeolite-based Fe catalysts, such as FeY
and FeZSM-5, could provide similar catalytic activities as homogeneous
Fe (II) ions [14,15,21]. The stability of these Fe containing
heterogeneous catalysts and their catalytic activity towards dye
degradation reaction largely depend on synthesis methods, composition
and their framework structure. Apart from this, care should
be taken to minimize the possibility of Fe leakage from heterogeneous
support which often results new pollution of the treated
water [16].
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