Abstract
Novel polyvinylidene fluoride/TiO2/UiO-66-NH2 (PVDF/TiUN) membranes were produced by the delay phase separation method via introducing the TiO2/UiO-66-NH2 (TiUN) nanocomposite into PVDF casting solution. Interconnection of TiO2 and UiO-66-NH2 improved photocatalysis capacity and endowed PVDF/TiUN membranes with self-cleaning capability. Quantitative measurements showed that, firstly, PVDF/TiUN membranes exhibited improved photodegradation kinetics and efficiency (up to 88.1%) to Rhodamine B (RhB). Secondly, the performances of bovine serum albumin (BSA) rejection and permeation of PVDF/TiUN membranes outperformed those of other check samples, indicating enhanced hydrophilicity. Thirdly, rejection rate of BSA reached a breathtaking 98.14% and flux recovery ratio (FRR) of BSA reached a breathtaking 95.37%. Thus, given their excellent anti-contamination property and separation performance, the PVDF/TiUN membrane is very likely to be a novel water treatment membrane.
Highlights
Population growth and industrialization lead to the increase of water consumption and exacerbation of water pollution (Shannon et al 2008; Feng et al 2016; Wei et al 2019; Sabri et al 2020)
The membrane-based ultrafiltration is associated with disadvantages, such as fouling effect caused by foulants in the wastewater and large amount of energy and water consumption required for clearing the foulants
The XRD pattern of the synthesized UiO-66-NH2 shown in Figure 2(b) was consistent with previous reports, indicating that UiO-66-NH2 was prepared with high quality
Summary
Population growth and industrialization lead to the increase of water consumption and exacerbation of water pollution (Shannon et al 2008; Feng et al 2016; Wei et al 2019; Sabri et al 2020). Kolesnyk et al (2020) synthesized C3N4-modified membranes and revealed their anti-fouling property to various types of foulants. Being inspired by those findings, we proposed a complementary strategy – combining MOFs with TiO2 could facilitate photo-generated electron transfer, enhance the photocatalytic activity and promote catalytic degradation of organics (Ma et al 2017). The nanoporous MOFs were synthesized and embedded into the membrane (Chen et al 2006; Liu et al 2011; Li et al 2014; Islam et al 2015; Crock et al 2017; Cao et al 2020) Membrane characteristics such as properties of anti-fouling clogging and photocatalytic self-cleaning were measured. The anti-fouling performance of MOF-modified membrane in the purification of protein and dye wastewater was quantified (Venkatesh et al 2016; Wu et al 2016; Shaffer et al 2019; Wang et al 2019)
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