Accelerated FeIII/FeII redox cycle of Fenton reaction system using Pd/NH2-MIL-101(Cr) and hydrogen

Abstract

In this paper, a novel improvement in the catalytic Fenton reaction system named MHACF-NH 2 -MIL-101(Cr) was constructed based on H 2 and Pd/NH 2 -MIL-101(Cr). The improved system would result in an accelerated reduction in Fe III , and provide a continuous and fast degradation efficiency of the 10 mg L -1 4-chlorophenol which was the model contaminant by using only trace level Fe II . The activity of Pd/NH 2 -MIL-101(Cr) decreased from 100% to about 35% gradually during the six consecutive reaction cycles of 18 h. That could be attributed to the irreversible structural damage of NH 2 -MIL-101(Cr).

The construction of a palladium–hydrogen accelerated catalytic Fenton system enhanced by UiO-66(Zr)

“…They could be rapidly mineralized by ˙OH. 31–33,40,41,43,44 As can be seen in Fig. 7(a), during a 3 h reaction process, the removal efficiencies of SMT and 4-CP were 94.23% and 100% in the MHACF-UiO-66(Zr) system, respectively, while they were 20.98% and 99.33% in the Fenton system.…”

“…The degradation efficiency of refractory organics in both the MHACF-MIL-101(Cr) system and MHACF-NH 2 -MIL-101(Cr) system significantly decreased with the continuous structure destruction of MIL-101(Cr) and NH 2 -MIL-101(Cr) in acidic conditions. 31–33…”

Accelerated iron valence cycling in Fenton system using activated hydrogen enhanced by MIL-100(Fe) modified by nano-Pd0 Particle

“…The nano-Pd 0 particle would gradually fall off during the reaction. Compared with the MIL-101(Cr) and NH 2 -MIL-101(Cr) used in our previous works [ 12 ], the MIL-100(Fe) had better durability. However, it was slightly less durable than that of UiO-66(Zr) and MOF-808(Zr) [ 13 , 14 ].…”

“…However, it was slightly less durable than that of UiO-66(Zr) and MOF-808(Zr) [ 13 , 14 ]. According to the soft and hard acid theory, this is because the high-priced metals have stronger acid resistance [ 12 ]. Firstly, we found the sole activity-MHACF-MIL-100(Fe) by differential experiments, and then we proved the presence of the main reactive oxygen ion -OH in the system by the probe capture method; then we explored the Fe III /Fe II cycle in the MHACF-MIL-100(Fe) system, and found that the Fe III /Fe II cycle in the MHACF-MIL-100(Fe) system is highly efficient, which makes this system have the ability of sustainable oxidation downgrade SMT.…”

“…The typical refractory organics such as sulfamethazine (SMT) and 4-chloro phenol (4-CP) could be eliminated rapidly [ 11 ]. Although a series of MOFs materials modified by nano-Pd 0 particle were used in this MHACF system such as MIL-101(Cr)[ 11 ], NH 2 -MIL-101(Cr) [ 12 ], MOF-808(Zr) [ 13 ] and UiO-66(Zr) [ 14 ], continuing to try to find stable MOFs material is still a worthwhile exploration. This is of great significance for expanding the application fields of MOFs materials and developing new advanced oxidation processes.…”