Novel H2O2–MnO2 system for efficient physico-chemical cleaning of fouled ultrafiltration membranes by simultaneous generation of reactive free radicals and oxygen

He, Xu; Li, Boda; Wang, Panpan; Ma, Jun

doi:10.1016/j.watres.2019.115111

Cited by 60 publications

(24 citation statements)

References 31 publications

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“…In addition, the stable permeate flux of the TFC-GO membrane (2.6–3.8 L/m 2 -h) indicates its superior chemical stability under intensive H 2 O 2 exposure. Furthermore, GO has abundant negatively charged groups, which act as an acceptor of OH radicals, resulting in a decrease in the number of oxidant radicals exposed to the PA layer, thereby increasing the H 2 O 2 resistance of the membrane [ 18 , 42 ]. Thus, the TFC-GO membrane demonstrated highly stable permeate flux and mitigated damage to the membrane structure caused by H 2 O 2 , thereby extending its lifetime.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the PPCP rejection properties of the TFC-GO membrane (52–60%) remained stable compared with the TFC membrane (36–52%) under the high-intensity H 2 O 2 exposure of 96,000 ppm-h. This phenomenon demonstrated that GO can capture active radicals and H 2 O 2 , resulting in the alleviation of damage to membrane structures [ 14 , 18 ]. In addition, GO nanoparticles can protect the underlying PA from oxidation exposure [ 10 ] and enhance the mechanical stability of membranes [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, most researchers have only reported the favorable water permeability and salt rejection (i.e., NaCl) of the GO-modified top selective layers of TFC membranes (TFC-GO). Few studies have systematically investigated the effects of TFC-GO membranes on the rejection performance of other valence salts and emerging contaminants (i.e., PPCPs) and chemical resistance to oxidative cleaning agents (i.e., sodium hypochlorite (NaOCl) and H 2 O 2 [ 18 ]) for long-term operation, and such properties are crucial for developing membranes suitable for practical applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancing H2O2 Tolerance and Separation Performance through the Modification of the Polyamide Layer of a Thin-Film Composite Nanofiltration Membrane by Using Graphene Oxide

Lin¹,

Zheng²,

Chen³

2021

Membranes

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Through interfacial polymerization (IP), a polyamide (PA) layer was synthesized on the top of a commercialized polysulfone substrate to form a thin-film composite (TFC) nanofiltration membrane. Graphene oxide (GO) was dosed during the IP process to modify the NF membrane, termed TFC-GO, to enhance oxidant resistance and membrane performance. TFC-GO exhibited increased surface hydrophilicity, water permeability, salt rejection, removal efficiency of pharmaceutical and personal care products (PPCPs), and H2O2 resistance compared with TFC. When H2O2 exposure was 0–96000 ppm-h, the surfaces of the TFC and TFC-GO membranes were damaged, and swelling was observed using scanning electron microscopy. However, the permeate flux of TFC-GO remained stable, with significantly higher NaCl, MgSO4, and PPCP rejection with increasing H2O2 exposure intensity than TFC, which exhibited a 3.5-fold flux increase with an approximate 50% decrease in salt and PPCP rejection. GO incorporated into a PA layer could react with oxidants to mitigate membrane surface damage and increase the negative charge on the membrane surface, resulting in the enhancement of the electrostatic repulsion of negatively charged PPCPs. This hypothesis was confirmed by the significant decrease in PPCP adsorption onto the surface of TFC-GO compared with TFC. Therefore, TFC-GO membranes exhibited superior water permeability, salt rejection, and PPCP rejection and satisfactory resistance to H2O2, indicating its great potential for practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing H2O2 Tolerance and Separation Performance through the Modification of the Polyamide Layer of a Thin-Film Composite Nanofiltration Membrane by Using Graphene Oxide

Lin¹,

Zheng²,

Chen³

2021

Membranes

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“…Notably, regime 3 is based on the ROS (HOO • , O 2 •− , and • OH) according to Equations (3-9). [76,77] Therefore, H 2 O 2 not only offers O 2 to propel the locomotion of Mn-micro/nanomotors, but also generates ROS to degrade organic pollutants in solutions.…”

Section: Mechanism Of Generating O 2 From H 2 Omentioning

confidence: 99%

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

Yang

Zhang

et al. 2021

Small

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As emerging micro/nano‐scale devices, micro/nanomotors have been innovatively applied in the environmental and biomedical applications. In this paper, the recent advances of Mn‐based micro/nanomotors (Mn‐micro/nanomotors) in catalytic oxidation of organic contaminants and the mechanisms in decomposition of H2O2 (e.g., the generation of O2 bubbles and reactive oxygen species) are reviewed. The intrinsic characteristics and synthetic strategies of Mn‐based materials are discussed, aiming to gain comprehensive understandings on the asymmetric design of micro/nanomotors. Mn‐micro/nanomotors have many advantages such as flexible structures, biocompatibility, powerful motion, long lifetime, and low‐cost as compared to noble‐metal micro/nanomotors. These merits fulfil Mn‐micro/nanomotors great promises from proof‐of‐concept studies to realistic applications, including pollutant decomposition, trace detection of heavy metal ions, oil removal, drug delivery, isolation of biological targets, and killing bacteria and cancer cells. The great flexibility in fabrication enables diverse and innovative strategies to address challenges for Mn‐micro/nanomotors, including high consumption of H2O2 and non‐directional motion. Meanwhile, a perspective of Mn‐micro/nanomotors in water remediation by coupling the motors with other Fenton/Fenton‐like systems to enhance the catalytic activity and to yield more reactive oxygen species is presented. Directions to the design of on‐demand H2O2‐fueled Mn‐micro/nanomotors for advanced purification of organic contaminants in aquatic systems are also proposed.

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“…When H 2 O 2 solution was pumped into the Mn-doped membrane, available Mn 3+ /Mn 4+ couples at the manganese-based catalyst surface effectively catalyzed the decomposition of H 2 O 2 (>98% of 1 mM H 2 O 2 decomposed inside membrane pores (Figure 4a,b)) to continuously produce ROS (i.e., HO• and 1 O 2 (Figure 4c,d)) (see Equations ( 3) and (4) in Figure 7) [14,28,33,48]. The oxidizing powers of generated ROS, especially HO•, toward organic matters are much stronger than that of H 2 O 2 [49,50]. The adsorbed organic foulants can be efficiently oxidized by generated ROS into smaller molecules and finally removed from the Mn-doped membrane.…”

Section: Intensified Catalytic Activity Of Mn-doped Membrane Toward H 2 O 2 Decompositionmentioning

confidence: 99%

In-Situ H2O2 Cleaning for Fouling Control of Manganese-Doped Ceramic Membrane through Confined Catalytic Oxidation Inside Membrane

Tang

Song

et al. 2021

Membranes

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This work presents an effective approach for manganese-doped Al2O3 ceramic membrane (Mn-doped membrane) fouling control by in-situ confined H2O2 cleaning in wastewater treatment. An Mn-doped membrane with 0.7 atomic percent Mn doping in the membrane layer was used in a membrane bioreactor with the aim to improve the catalytic activity toward oxidation of foulants by H2O2. Backwashing with 1 mM H2O2 solution at a flux of 120 L/m2/h (LMH) for 1 min was determined to be the optimal mode for in-situ H2O2 cleaning, with confined H2O2 decomposition inside the membrane. The Mn-doped membrane with in-situ H2O2 cleaning demonstrated much better fouling mitigation efficiency than a pristine Al2O3 ceramic membrane (pristine membrane). With in-situ H2O2 cleaning, the transmembrane pressure increase (ΔTMP) of the Mn-doped membrane was 22.2 kPa after 24-h filtration, which was 40.5% lower than that of the pristine membrane (37.3 kPa). The enhanced fouling mitigation was attributed to Mn doping, in the Mn-doped membrane layer, that improved the membrane surface properties and confined the catalytic oxidation of foulants by H2O2 inside the membrane. Mn3+/Mn4+ redox couples in the Mn-doped membrane catalyzed H2O2 decomposition continuously to generate reactive oxygen species (ROS) (i.e., HO• and O21), which were likely to be confined in membrane pores and efficiently degraded organic foulants.

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Novel H2O2–MnO2 system for efficient physico-chemical cleaning of fouled ultrafiltration membranes by simultaneous generation of reactive free radicals and oxygen

Cited by 60 publications

References 31 publications

Enhancing H2O2 Tolerance and Separation Performance through the Modification of the Polyamide Layer of a Thin-Film Composite Nanofiltration Membrane by Using Graphene Oxide

Enhancing H2O2 Tolerance and Separation Performance through the Modification of the Polyamide Layer of a Thin-Film Composite Nanofiltration Membrane by Using Graphene Oxide

Manganese‐Based Micro/Nanomotors: Synthesis, Motion, and Applications

In-Situ H2O2 Cleaning for Fouling Control of Manganese-Doped Ceramic Membrane through Confined Catalytic Oxidation Inside Membrane

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