Adsorption Capacity Of Membrane Research Articles

Novel Core/Shell Nylon 6,6/La-TMA MOF Electrospun Nanocomposite Membrane and CO2 Capture Assessments of the Membrane and Pure La-TMA MOF.

Membrane technology plays a vital, applicable, and essential role in human life and industry. The high adsorption capacity of membranes can be employed for capturing air pollutants and greenhouse gases. In this work, we tried to develop a shaped industrial form of a metal-organic framework as an adsorbent material with the ability to capture CO2 in the laboratory phase. To do so, a core/shell Nylon 6,6/La-TMA MOF nanofiber composite membrane was synthesized. This organic/inorganic nanomembrane is a kind of nonwoven electrospun fiber that was prepared using the coaxial electrospinning approach. FE-SEM, surface area calculations, nitrogen adsorption/desorption, XRD grazing incidence on thin films, and histogram diagrams were applied to assess the quality of the membrane. This composite membrane as well as pure La-TMA MOF were assessed as CO2 adsorbent materials. The CO2 adsorption abilities of the core/shell Nylon 6,6/La-TMA MOF membrane and pure La-TMA MOF were as high as 0.219 and 0.277 mmol/g, respectively. As a result of preparing the nanocomposite membrane from microtubes of La-TMA MOF, the %A of the micro La-TMA MOF (% 43.060) increased to % 48.524 for Nylon 6,6/La-TMA MOF.

Removal of Typical PPCPs by Reverse Osmosis Membranes: Optimization of Treatment Process by Factorial Design

In this paper, the removal effect of reverse osmosis (RO) on three common pharmaceuticals and personal care products (PPCPs), including ibuprofen (IBU), carbamazepine (CBZ), and triclosan (TCS), were compared under different process conditions, and the removal rate of PPCPs, membrane flux, and PPCPs membrane adsorption capacity were analyzed. The removal rate increased with the increase of the influent concentration and pre-membrane pressure, while pH influenced the removal effect of different PPCPs by affecting the electrostatic interaction between pollutants and membranes. It was also found that the dynamic adsorption of PPCPs on RO membranes under different conditions complied with the pseudo-first-order reaction kinetic adsorption model. The maximum stable adsorption capacity and the adsorption rate of PPCPs on membranes under various conditions were simulated based on the model. Moreover, through factorial design, the removal rates of RO on IBU, CBZ, and TCS could reach 98.93%, 97.47%, and 99.01%, respectively, under the optimal conditions (with an influent concentration of 500 μg/L, pre-membrane pressure of 16 bar and pH = 10). By optimizing the process of removing PPCPs with the RO membrane method, the optimal process conditions of removing IBU, CBZ, and TCS with the RO membrane method were obtained, which provided reference conditions and data support for the practical application of removing PPCPs with the RO membrane method.

Plant-derived hybrid coatings as adsorption layers for uranium adsorption from seawater with high performance

It is critical for resource sustainability and environmental security to develop simple and dependable seawater uranium (VI) (U(VI)) enrichment technology. Membrane materials show excellent performance in the field of adsorption due to their pore structure and recyclability. In this study, a functional coating primarily composed of plant-derived tannic acid (TA) and polyethyleneimine was easily decorated on polyvinylidene fluoride (PVDF) microporous membranes for highly efficient uranium extraction via filtration. The synergistic effect of amino group from PEI and polyphenol structure plays an important role to achieve high adsorption capacity and rapid adsorption kinetics toward U(VI). Furthermore, the higher the molecular weight of PEI, the greater the modified membrane's adsorption capacity to U(VI). The membrane adorned with the optimized functional coating demonstrates outstanding removal rates (91%) and adsorption capacity (164.1 mg g−1 at C0 = 99.55 mg L−1) under extremely high permeate flux (11324.54 L m−2 h−1) due to its high adsorption capacity and quick adsorption kinetics. Moreover, the functional coating also possesses excellent reusability, antifouling performance, high flux recovery rate (FRR) (∼ 98%) and low flux decay rate (FDR) (<5%) after ten cycles. Particularly, the membrane's U(VI) adsorption capability in natural seawater can increase to 6.86 mg g−1. Considering the facile and mild modification process, as well as the green and low costing materials, the plant-derived hybrid coatings have a great application prospect in the field of seawater U(VI) extraction.

Synthesis of composite zeolite membrane by low-temperature water bath for efficient dynamic hardwater softening

In recent years, zeolite membrane has developed rapidly in the application of water treatment technology. However, the traditional zeolite membrane preparation process has the shortcomings of high temperature hydrothermal and other complex processes, which hinder its potential for large-scale industrial applications. In this study, a metakaolin/slag composite NaA zeolite membrane (GNaAM-20) on stainless steel substrate was prepared by composite geopolymer (metakaolin mixed with 20% slag) in a low-temperature water bath method, and GNaAM-20 was applied to the dynamic separation of Ca2+ from hard water. In this work, the mechanical strength (10.08 MPa) and crystallinity (92.13%) of composite zeolite membrane were enhanced by adjusting the slag content, so that a compact and higher removal efficiency zeolite membrane was prepared. The results showed that the GNaAM-20 had excellent acid resistance (pH = 1) with a removal efficiency of 92.03%, and the Ca2+ average removal efficiency by dynamic filtration after ten times of filtration (500 mL per filtration) was 91.2% using a 500 mg·L−1 Ca2+ solution. The maximum dynamic membrane adsorption capacity of GNaAM-20 was 102.54 mg·g−1. Compared with powder or gel adsorbents. GNaAM-20 virtually maintained its initial removal abilities after 5 regeneration cycles (average removal rate of more than 95%), and it had more significant advantages in terms of recycling and regeneration. Therefore, this study provides new ideas for achieving hard water softening and provides scientific guidance for industrial production.

Synthesis of activated carbon-surfactant modified montmorillonite clay-alginate composite membrane for methylene blue adsorption

In this research work, a novel composite membrane was synthesized from activated carbon (AC) derived from sesban, sodium benzyl dodycyel sulphate (SBDS) treated montmorillonite (MMT) clay and alginate (alg) for the adsorption of methylene-blue (MB) dye. The AC-MMT-alg composite membranes were characterized using analytical characterizations such as FTIR, SEM, EDX and TGA analysis. Several important factors like initial solution pH, contact time, membrane dose, MB concentrations and temperature effect on the adsorption efficiency of membrane were investigated. MB dye adsorption on the synthesized membrane was explained well by pseudo second order equation. Isotherm study showed that MB adsorption data followed Langmuir adsorption isotherm model. The adsorption capacity of membrane for MB was 1429 mg/g from aqueous solution. Thermodynamic study confirmed endothermic and spontaneous MB adsorption on the adsorbent. The mechanistic path way indicated that electrostatic forces were involved in this adsorption process. The synthesized membrane proved an efficient adsorbent for MB adsorption from aqueous media.

CELLULOSE NANOFIBERS OF OIL PALM BIOMASS IN ALGINATE-BASED MEMBRANES FOR WATER-ETHANOL MIXTURE SEPARATION

TEMPO-oxidized cellulose nanofibers (TOCNs) from waste of oil palm empty fruit bunches (OPEFB) were integrated into an alginate matrix to increase the capacity of the alginate membrane for water-ethanol separation. The membrane composed of the alginate matrix and TOCNs was characterized in terms of its morphological, physical-mechanical properties and performance in the separation of water-ethanol suspensions, with ethanol concentrations in the suspension of 10% and 20%. Other alginate membranes integrated with commercial TOCNs from wood were also prepared and tested for comparison. The results showed that the addition of TOCNs (made from wood and OPEFB waste) to the alginate matrix improved the water adsorption capacity of the membrane. The water adsorption capacity of the alginate membranes with wood-derived TOCNs, OPEFB-derived TOCNs and alginate only was 78%, 87% and 66%, respectively. The flux capacity of the alginate membrane, integrated with OPEFB-derived TOCNs, was higher than that of the alginate membrane alone, but lower than that of the alginate membrane integrated with wood-derived TOCNs. This study showed the utilization of nanocellulose from palm oil biomass waste can be considered to improve the physical-mechanical properties of alginate-based membranes used for various applications, including filtration.

Microporous polymer adsorptive membranes with high processing capacity for molecular separation

Trade-off between permeability and nanometer-level selectivity is an inherent shortcoming of membrane-based separation of molecules, while most highly porous materials with high adsorption capacity lack solution processability and stability for achieving adsorption-based molecule separation. We hereby report a hydrophilic amidoxime modified polymer of intrinsic microporosity (AOPIM-1) as a membrane adsorption material to selectively adsorb and separate small organic molecules from water with ultrahigh processing capacity. The membrane adsorption capacity for Rhodamine B reaches 26.114 g m−2, 10–1000 times higher than previously reported adsorptive membranes. Meanwhile, the membrane achieves >99.9% removal of various nano-sized organic molecules with water flux 2 orders of magnitude higher than typical pressure-driven membranes of similar rejections. This work confirms the feasibility of microporous polymers for membrane adsorption with high capacity, and provides the possibility of adsorptive membranes for molecular separation.

Fabrication of polyacrylonitrile-Li1.6Mn1.6O4 composite nanofiber flat-sheet membranes via electrospinning method as effective adsorbents for Li+ recovery from salt-lake brine

In this paper, polyacrylonitrile (PAN) as the binder and Li1.6Mn1.6O4 as the powder were used to prepare the composite nanofiber flat-sheet membrane-type adsorbent (ESNM-H) via the electrospinning method. The influence factor on membrane adsorption capacity for Li+ were investigated, such as the concentration of PAN, precursor content, and membrane thickness. When the content of PAN and Li1.6Mn1.6O4 were 10 wt% and 18 wt%, respectively, the equilibrium adsorption capacity for Li+ on ESNM-H with the thickness of 164 ± 4 μm was 1328 mg/m2, and the actual adsorption capacity of powder H1.6Mn1.6O4 incorporated in the nanofiber membrane remained 92% of the unsupported powder. In the artificial salt-lake brine, the adsorption selectivity of ESNM-H for Li+ was higher to other interfering ions (Na+, Ca2+, K+ and Mg2+). After eight cycles, the adsorption capacity of ESNM-H decreased by 8%. The ESNM-H exhibited the better long-term stability. The ESNM-H packed column was enriched with Li+ from 100 mg/L to 726 mg/L after ten consecutive dynamic adsorption–desorption cycles. The overall results show that the composite nanofiber flat-sheet membrane-type adsorbent fabricated via the electrospinning method has potential applications and recyclability in adsorbing Li+ from salt-lake brine.

Composite hydrogel membrane with high mechanical strength for treatment of dye pollutant

• The PVA-TiO 2 composite membrane with high tensile strength was developed. • The tensile strength of membrane can reach 14.3 MPa. • The maximum adsorption capacity of membrane to methylene blue is about 318.47 mg/g. • After 4 d of nature light treatment, the removal rate of methylene blue is 99.85%. • The membrane has the potential for the treatment of dye pollutant in industry. By adding dimethyl sulfoxide (DMSO), nano titanium dioxide (TiO 2 ) and sodium carbonate (Na 2 CO 3 ) to polyvinyl alcohol (PVA), the PVA-TiO 2 composite hydrogel membrane with high mechanical properties and photocatalytic ability was prepared using the freeze–thaw cycle method. The addition of DMSO and TiO 2 can effectively improve the mechanical strength of the composite hydrogel membrane and its photocatalytic degradation efficiency of dye. By optimizing the raw material ratio and preparation process, the tensile strength of the prepared composite membrane can reach 14.3 MPa, which is the highest among the reported membrane of its kind. The maximum tensile toughness is 8.16 MJ/m 3 , indicating the good ductility. The maximum adsorption capacity of methylene blue (MB) calculated from Langmuir isotherm model is 318.47 mg/g and after 4 d nature light treatment, the dye removal rate can reach 99.85%.

High salinity enhances the adsorption of 17α-ethinyl estradiol by polyethersulfone membrane: isotherm modelling and molecular simulation

The increasing occurrence of steroidal hormone micropollutant in the aquatic environment and their associated consequences have caused serious environmental concerns globally. Adsorptive removal of hormonal pollutants using polymeric membranes has been suggested but information on their performance in various environmental conditions is lacking. In this study, we examined the effect of salinity on the performance of polyethersulfone (PES) membrane to remove synthetic hormone 17α-ethinyl estradiol (EE2) from water. Our results show that an increase of salinity from 0 to 3% results in higher retention of EE2 onto PES membrane from 79.3 to 98.7%. The experimental results fit the Freundlich isotherm model better as compared to the Langmuir model. The Freundlich parameters n and Kf yielded the highest values at 3% salinity. The molecular simulation results suggest that a high salinity increases the binding energy between EE2 and PES membranes, promoting the PES-EE2 interaction through π–π interaction, hydrogen bonding and hydrophobic interaction. This study provides valuable information for improving design of specialised treatment facilities (in farming, pharmaceutical industries, etc.) to allow better removal of EE2 and other low-polar organic contaminants from water via a membrane-based sorption-elution method, and we recommend the inclusion of salinity as a factor in modelling the adsorption capacity of membranes to prevent the oversaturation of membrane and minimise the release of contaminants into the environment.

Polycarbonate/copper oxide mixed matrix membrane for separation of lead and cadmium from industrial effluents

ABSTRACT In this study, PC/CuO ultrafiltration adsorptive mixed matrix membranes (AMMM) were synthesized using phase inversion method to remove lead (Pb (II)) and cadmium (Cd (II)) from a petrochemical plant synthetic effluent. The effects of CuO on pure water flux, hydrophilicity, porosity and membrane adsorption capacity were studied. FESEM and AFM tests were used to investigate the structure and surface roughness of the prepared membrane. The results showed that by increasing the loading of CuO in AMMM, the total porosity, average pore size, hydrophilicity, surface roughness and water flux increased. The heavy metal adsorption on PC/CuO-AMMMs were adequately interpreted by the Langmuir isotherm. Our findings showed that the membrane produced with the highest loading of CuO had the highest adsorption capacity and offers a maximum adsorption capacity of 22.9 and 21.6 g/m2 for lead and cadmium respectively. By placing the cation-saturated AMMMs in a regeneration solution, up to 95% and 94%, respectively, for lead and cadmium adsorption recovery was experienced. This indicates the reversibility of the fabricated membranes to remove lead and cadmium cations via a simple regeneration method in a multicycle process.

Enhancing PPCPs Removal and Membrane Fouling Control of Ultrafiltration Membrane by UiO-66@Fe3O4@UiO-66

Pharmaceuticals and personal care products (PPCPs) adsorption and membrane fouling control were realized by a polyvinylidene fluoride (PVDF) membrane loaded with multifunctional metal-organic frameworks (MOFs) in this study. During adsorption, the multifunctional MOFs UiO-66@Fe3O4@UiO-66 in the mixed-matrix membrane (MMMs) could adsorb two typical PPCPs, salicylic acid (SA), and dimethyl phthalate (DMP), efficiently. In the membrane catalytic regeneration process, Fe3O4 in UiO-66@Fe3O4@UiO-66 could catalyze H2O2 to generate hydroxyl radicals (HO·), coupling MOFs/PVDF adsorption capacity regeneration and membrane cleaning. The results show that 10%MOFs/PVDF exhibits the highest adsorption efficiency for 0.1 mmol·L-1 SA and DMP under neutral conditions, and the removal rate reached 64.2% and 46.1%, respectively. Additionally, the pure water flux and membrane adsorption capacity of 10%MOFs/PVDF were able to recover about 91.8% and 94.2%, respectively, using 5 mmol·L-1 H2O2. In this research, the main characteristic of MOFs/PVDF is coupling of the membrane adsorption capacity regeneration and membrane fouling control process. This provides new ideas for the removal of PPCPs and the improvement of membrane anti-fouling performance during the deep purification of secondary effluent.

Flexible and free-standing pristine polypyrrole membranes with a nanotube structure for repeatable Cr(VI) ion removal

The effective removal of toxic Cr(VI) from wastewater remains an important environmental issue. The low adsorption capacity and the complex processes to separate the adsorbents from the treated wastewater are the main scientific and technological challenges. In this study, a flexible and free-standing pristine polypyrrole (PPy) membrane with a nanotube structure (PPy-N) was synthesized via template-assisted interfacial polymerization (TIP) for the selective removal of Cr(VI) through a simple separation and collection process. The superior Cr(VI) adsorption capacity as high as 250.31 mg/g was endowed by the unique structure of the PPy-N membrane. The Langmuir adsorption isotherm model was used to describe the adsorption behavior, with the adsorption kinetics followed a quasi-second-order kinetic model. After four adsorption-and–desorption cycles, the PPy-N membrane adsorption capacity fell by only 8.2%. The mechanism of the selective removal of Cr(VI) was proposed, including electrostatic adsorption, ion exchange and reduction. A combination of the highly attractive material properties, including mechanical processability, large surface area, superior Cr(VI) adsorption capacity and regeneration, makes the single-component PPy-N membrane a good candidate for removing Cr(VI) ions from wastewater.

Electrosprayed Chitosan Nanoparticles Decorated on Polyamide6 Electrospun nanofibers as Membrane for Acid Fuchsin Dye Filtration from water

In this work decorated chitosan nanoparticles/Polyamide6 (CSNPs/PA6) membrane was prepared by combination of electrospinning and electrospraying methods. Firstly, PA6 nanofibers web was produced by electrospinning and then electrospraying method was performed to produce decorated CSNPs on the PA6 nanoweb. The results revealed that CSNPs were well distributed on the PA6 surface and well bonded to the fibers. The AFM studies showed that roughness of the membrane increased because of the presence of nanoparticles. Contact angle measurements showed the membrane surface hydrophilicity increases due to the presence of CSNPs. The performance of CSNPs/PA6 membrane was investigated in adsorption of Acid Fuchsin dye (AF) from aqueous solution. The CSNPs/PA6 membrane adsorption capacity of 1679 mg/g was obtained at 298 K. Response surface methodology (RSM) was used for the modeling and optimization of AF dye removal process and effect of various factors were studied. The results of optimization showed that maximum removal efficiency of AF dye can be obtained at AF dye initial concentration of 375 mg/L, adsorbent dosage of 0.01 g, temperature of 30 ⁰C and contact time of 70 min. Different error functions were used in fitting of adsorption isotherms and kinetic models.

In vitro Evaluation of Linezolid and Doripenem Clearance with Different Hemofilters

Introduction: Renal replacement therapy (RRT) is widely used in the treatment of septic acute kidney injury. However, little is known about how the adsorption properties of hemofilters used in RRT affect antibiotic concentration. Because a cytokine-adsorption membrane is frequently used in RRT, it is important to determine the antibiotic adsorption capacity of this membrane. Objective: The present study aimed to investigate the antibiotic adsorption capacity of different hemofilter membranes by in vitro experiments using 2 antibacterial agents (linezolid and doripenem). Methods: We performed experimental hemofiltration in vitro using polyacrylonitrile (AN69ST), polymethylmethacrylate (PMMA), and polysulfone (PS) hemofilters for 1,440 min. The test solution was a 1,000-mL substitution fluid containing 30 µg/mL linezolid and 120 µg/mL doripenem. We measured drug concentrations at the inlet, outlet, and filtrate ports of the hemofilters for 1,440 min and calculated the sieving coefficient (SC) and adsorption rate (Ra) of the drugs onto the hemofilters. Results: The amount of linezolid adsorbed onto AN69ST, PMMA, and PS membranes was decreased relative to that in the control group at 15 min (p < 0.05). However, no SC for linezolid was obtained thereafter. The Ra of linezolid onto AN69ST, PMMA, and PS membranes was higher than that in the control group (p < 0.05). In contrast, no significant differences were observed in the concentrations and Ra values of doripenem adsorbed onto AN69ST, PMMA, and PS membranes compared with those in the control group. Conclusions: Doripenem was not adsorbed onto PMMA, PS, and AN69ST membranes. Linezolid was adsorbed onto PMMA, PS, and AN69ST membranes, but only temporarily, and this did not affect drug bioavailability.

Arsenate removal by reactive mixed matrix PVDF hollow fiber membranes with UIO-66 metal organic frameworks

High arsenic concentration in drinking water is a great threat to human health. In this study, reactive mixed matrix polyvinylidene fluoride (PVDF) hollow fiber membrane (HFM) was fabricated by embedding UiO-66 particles, a water stable metal organic frameworks (MOFs), for the removal of arsenate from aqueous solutions. Adsorption and membrane filtration were combined for arsenate treatment and the results showed that arsenate could be removed efficiently by this strategy. Adsorption of arsenate onto UiO-66 particles was first investigated using batch experiments for the determination of adsorption isotherm, pH edge, and adsorption kinetics. The maximum arsenic adsorption by UiO-66 was found to reach 267 mg/g at pH 4.7, which was ranked among the top of all arsenic sorbents reported in the literature. UiO-66 particles were then mixed in the dope of PVDF to produce the mixed matrix HFM for arsenate removal from water. The removal efficiency was studied for 6 types of HFMs with an increasing amount of UiO-66 particles. The pristine PVDF HFM without UiO-66 particles could not remove arsenate from water as expected; the pores of ultrafiltration membranes are too large to reject arsenate. With UiO-66 particles embedded into the membrane matrix, the adsorption capacity of membrane was increased significantly, resulting in arsenate removal primarily by sorption during the membrane filtration. The UiO-66 particles-embedded HFM was characterized by morphology, hydrophilicity, arsenate rejection, and ATR-FTIR. This study demonstrated that the reactive ultrafiltration membrane had a great premise to treat drinking water with arsenic.

Macroporous membranes doped with micro-mesoporous β-cyclodextrin polymers for ultrafast removal of organic micropollutants from water

Herein, we report novel macroporous membranes doped with micro-mesoporous β-cyclodextrin polymers (β-CDP), named β-CDP membranes, for water decontamination by the flow-through process. These membranes combine excellent adsorption behavior of β-CDP and the advantages of membranes filtration including low energy consumption and easy scale-up. Filtration adsorption results demonstrated that the optimal β-CDP membrane removed > 99.9% of bisphenol A with ultrahigh water flux (3000 L m−2 h−1) or high concentration (50 mg L−1). The dynamic adsorption capacity of the membrane was close to the static maximum adsorption capacity of membrane, suggesting the effective accessibility of adsorption sites. The outstanding adsorption performance was attributed to the synergistic effect of the fast adsorption of β-CDP, abundant β-CDP nanoparticles and large contact area offered by spongy pores. Furthermore, not only single other organic micropollutants but also mixture was completely removed by the β-CDP membranes. In addition, the membranes were easily regenerated by simple ethanol filtration.

Sandwich membranes based on PVDF-g-4VP and surface modified graphene oxide for Cu(II) adsorption.

UV photo-preactivation/thermally-induced grafting was employed for grafting 4-vinylpyridine (4-VP) on polyvinylidene fluoride (PVDF), and graphene oxide (GO) was modified with 4'-carboxy-2,2':6',2"-terpyridine (CTPy). Then sandwich PVDF-g-4VP/GO-CTPy/polytetrafluoroethylene (PTFE) membrane was fabricated for adsorption of Cu (II) as a model. The membrane formation, static adsorption thermodynamics, kinetics and dynamic adsorption/desorption were studied. The results showed that, the addition of polyethylene glycol (PEG 4000) as porogen can significantly increase the porosity and adsorption capacity of the membranes. The adsorption could be well described by the Langmuir model and pseudo-second-order kinetic model. The breakthrough volume and saturated volume increased with rising GO-CTPy contents. The adsorption capacity of sandwich membranes was much higher than that of mixed matrix membranes. The sandwich membrane also exhibited excellent reusability in dynamic adsorption/desorption cycles, demonstrating great potential in adsorption of trace Cu (II).

Fabrication of MWCNTs-polysulfone composite membranes and its application in the removal of bisphenol A

To explore the efficient removal of dissolved organic pollutant molecules from water, multi-walled carbon nanotubes (MWCNTs)-polysulfone (PSF) composite membranes with high CNTs hybrid content were fabricated, and the adsorption and ultrafiltration behaviors towards bisphenol A (BPA) were explored in this study. The MWCNTs-PSF composite membranes were composed of a dense top surface and a porous bulk layer with MWCNTs separately embedding in or hanging on the polymer matrix. The pore size of the top surface centralized in 30–70 nm. The pure water flux of MWCNTs-PSF membranes was found to be variable in accordance with the surface pore size. The adsorption capacity of membranes towards BPA from water was remarkably enhanced by the composite of MWCNTs, and the maximum adsorption capacity of M-CNT15 was more than twice of that of M-PSF. In the filtration process, the MWCNTs-PSF composite membranes exhibited obviously superior retaining capacities to the neat PSF membrane. The M-CNT15 membrane maintained 20% rejection to BPA molecules in steady-state, comparison to nearly zero rejection of M-PSF under the same operating conditions.

Highly permeable biocatalytic membrane prepared by 3D modification: Metal-organic frameworks ameliorate its stability for micropollutants removal

Aquatic micropollutants seriously affect human health. Biocatalytic membranes with immobilized laccase show a great potential for micropollutants removal. However, highly efficient and stable biocatalytic membranes are still under development. Herein, the separation and support layers of polyacrylonitrile (PAN) ultrafiltration membrane are sequentially modified by polyethyleneimine (PEI), metal–organic frameworks (MOFs), laccase and polydopamine (PDA), termed as “three dimensional (3D) modification”. The PEI polymers inserted in the selective separation layer result in charge reversal, thus immobilizing laccase mainly by electrostatic adsorption. The water-stable MOFs particles adhered on the support layer fibers can enhance the membrane adsorption capacity to laccase and micropollutants (called dual adsorption effect). PEI and MOFs dominate laccase loading and distribution in the membrane, thus greatly affecting micropollutants removals. The LacPAN-MIL-101-L biocatalytic membrane shows high permeability with desirable micropollutants removal, wide pH operating range and good reusability. Theoretically, this “3D modification” strategy can enable all the composite membranes to be biocatalytic membrane prepared by simple reverse filtration and subsequent coating.