However, the homogeneous Fenton process has manycritical drawbacks, such as: (i) Requirement of further treatments for the dissolved iron ions and sludge due to the use of ferric salts
during the process. (ii) Neutralization of treated solutions before discharge because of the essential condition of acidification (pHof 2–3) in traditional Fenton system, which complicates the overall traditional Fenton process, makes the method uneconomical, and even generates secondary pollution of acid or metal ions easily