Cost‐Effective H₂O₂‐Regeneration of Powdered Activated Carbon by Isolated Fe Sites

Abstract

The reuse of powdered activated carbon (PAC) vitally determines the economics and security of the PAC‐based adsorption process, while state‐of‐the‐art PAC regeneration technologies are usually unsatisfactory. Here, it is demonstrated that isolated Fe sites anchored on commercial PAC enable fast H2O2 activation to produce Fe‐based reactive oxygen species for highly efficient PAC regeneration at room temperature. Taking rhodamine B as a representative pollutant, PAC decorated with isolated Fe sites realize H2O2 based regeneration with negligible adsorption capacity degradation for 10 cycles. Moreover, in terms of the PAC loss rate, this technology is greatly superior to traditional Fenton‐based regeneration technology. Further operando experiments and theoretical calculations reveal that the high regeneration performance can be attributed to the isolated HOFeO motifs, which activate H2O2 via a nonradical reaction pathway. These findings provide a very promising strategy toward reducing the cost of H2O2‐based PAC regeneration technology.

Sorption of Halogenated Anti-Inflammatory Pharmaceuticals from Polluted Aqueous Streams on Activated Carbon: Lifetime Extension of Sorbent Caused by Benzalkonium Chloride Action

“…It can be assumed that potential other cycles of activation of GAC in the column could be performed using higher doses of BAC within activation steps. The price of applied BAC [29] is still lower than the pyrolytic regeneration of GAC [55], and it is obvious that the prolonging of GAC lifetime using BAC is able to postpone expensive GAC regeneration.…”

Advanced Oxidation Processes for Activated Carbon Regeneration: From Fundamental to Application

“…For example, Du et al found that an increase in persulfate concentration could produce more sulfate radicals, which improved the regeneration efficiency of AC . However, it should be noted that an elevated ROS concentration also increases the potential damage to the AC structure, ultimately reducing its reabsorption capacity, highlighting the trade-off between effective contaminants degradation and potential damage to AC structure from high ROS concentrations. ,− …”

“…AC regeneration technologies are diverse, encompassing thermal treatment, solvent extraction, biological degradation and advanced oxidation processes (AOPs). , While thermal and solvent extraction regeneration methods have proven effective, their high energy demands and significant environmental impact have raised concerns. , Biological regeneration is often less costly compared to other methods, yet it requires prolonged operation durations and its effectiveness is significantly influenced by the biodegradability of the adsorbed pollutants . Consequently, attention has shifted toward the exploration of alternative regeneration techniques, such as AOPs, which are considered a promising method for spent AC regeneration due to their low temperature operation, minimal waste production, and the potential for complete mineralization of organic contaminants. , …”

Dual Functional Titanium Hydride Particles for Anti‐Ultraviolet and Anti‐Oxidant Applications

“…The characteristic peak at 410 nm collected from UV-vis spectrophotometer is used to evaluate the concentration. [34]…”