Preparation, characterization and scaling propensity study of a dopamine incorporated RO/FO TFC membrane for pesticide removal

Fini, Mahdi Nikbakht; Zhu, Junyong; Bruggen, Bart Van der; Madsen, Henrik

doi:10.1016/j.memsci.2020.118458

Cited by 27 publications

(12 citation statements)

References 59 publications

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“…Moreover, the spectra of control/PA and M8/PA have obvious peaks at 1542, 1613, and 1660 cm −1 , which are ascribed to the NH bending of amide II, aromatic amide, and amide I. The peak within 3100–3690 cm −1 is the stretching vibration of NH and OH 30,31 . They prove that PA layer has been synthesized on the surface of the as‐prepared blend membranes, which is consistent with the SEM results.…”

Section: Resultssupporting

confidence: 84%

Nanofiltration‐like forward osmosis membranes on in‐situ mussel‐modified polyvinylidene fluoride porous substrate for efficient salt/dye separation

Guo

et al. 2021

Journal of Polymer Science

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Here, polyvinylidene fluoride (PVDF) membranes were fabricated via non‐solvent induced phase separation (NIPS) using dopamine (DA) and polyethyleneimine (PEI) as the hydrophilic additives, which has a loose surface and somewhat improved hydrophilicity. Then nanofiltration (NF)‐like thin‐film composite forward osmosis (TFC FO) membrane with a loose polyamide (PA) active layer on the blend membrane was synthesized via the interfacial polymerization. The as‐prepared NF‐like TFC FO membrane exhibited a high water flux (Jw) of 29.98 L m−2 h−1 and a much low specific salt flux (Js/Jw) of 0.018 g/L, when 0.6 M NaCl was used as draw solution (DS). It had a superior rejection of malachite green (99.6% ± 0.1%) and a low rejection of NaCl (27.4% ± 4.2%), when filtrated malachite green/NaCl mixture solution in active layer‐facing draw solution (AL‐FS) mode. The results provide new insights on the design and preparation of FO membranes of selective separation for dyes from salty water.

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Section: Resultssupporting

confidence: 84%

Nanofiltration‐like forward osmosis membranes on in‐situ mussel‐modified polyvinylidene fluoride porous substrate for efficient salt/dye separation

Guo

et al. 2021

Journal of Polymer Science

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“…The R a values decreased from 17.6 nm (TFC) to 15.5 (PTFC), 8.1 (TFC CQD ), and 9.9 nm (PTFC CQD ). The decreased roughness of PTFC CQD and TFC CQD membranes (by comparing with TFC membrane) should be helpful for membranes to be less polluted in the filtration process. − The hydrophilic groups on N-CQDs can increase the interfacial area between aqueous and organic solutions, which contributes to the uniform formation of the ultrathin PA layer on the PES support. , …”

Section: Resultsmentioning

confidence: 99%

Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes

Wang

Zhang

Cai

et al. 2021

ACS Appl. Mater. Interfaces

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Low permeability and chlorine resistance of normal thin-film composite (TFC) membranes restrict their practical applications in many fields. This study reports the preparation of a high chlorine-resistant TFC membrane for forward osmosis (FO) by incorporating corn stalk-derived N-doped carbon quantum dots (N-CQDs) into the selective polyamide (PA) layer to construct a polydopamine (PDA) sub-layer (PTFCCQD). Membrane modification is characterized by surface morphology, hydrophilicity, Zeta potential, and roughness. Results show that TFCCQD (without PDA pretreatment) and PTFCCQD membranes possess greater negative surface charges and thinner layer-thickness (less than 68 nm). With N-CQDs and PDA pretreatment, the surface roughness of the PTFCCQD membrane decreases significantly with the co-existence of microsized balls and flocs with a dense porous structure. With the variation of concentration and type of draw solution, the PTFCCQD membrane exhibits an excellent permeability with low J (reverse salt flux)/J (water flux) values (0.1-0.25) due to the enhancement of surface hydrophilicity and the shortening of permeable paths. With 16,000 ppm·h chlorination, reverse salt flux of the PTFCCQD membrane (8.4 g m–2 h–1) is far lower than those of TFCCQD (136.2 g m–2 h–1), PTFC (127.6 g m–2 h–1), and TFC (132 g m–2 h–1) membranes in FO processes. The decline of salt rejection of the PTFCCQD membrane is only 8.2%, and the normalized salt rejection maintains 0.918 in the RO system (16,000 ppm·h chlorination). Super salt rejection is ascribed to the existence of abundant NH bonds (N-CQDs), which are preferentially chlorinated by free chlorine to reduce the corrosion of the PA layer. The structure of the PA layer is stable during chlorination also due to the existence of various active groups grafted on the surface. This study may pave a new direction for the preparation of durable biomass-derivative (N-CQD)-modified membranes to satisfy much more possible applications.

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“…However, most studies stated that the presence of electrostatic attraction decreased the overall rejection of membranes [27,30]. On the other hand, low adsorption rate thus high rejection in RO membranes was seen in the case of negatively charged molecules because of high electrostatic repulsion [28][29][30].…”

Section: Pesticides Ionic Chargementioning

confidence: 99%

“…Pesticide polarity was interrelated with the molecular weight when it came to pesticides retention. More than one study showed that micropollutants which show low rejection shared common traits like low molecular weight and neutral charge [23,26,27,29]. Interestingly, Salamanca and coresearchers [23] reported that micropollutants with positive charge had an unexpectedly high rejection (≤ 99.99 %) for its molecular weight in FO mode.…”

Section: Pesticides Ionic Chargementioning

confidence: 99%

Critical Evaluation of Thin Film Composite Membrane on Pesticide Removal

Lee

Chong

Hoon

et al. 2022

AMST

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This study focuses on how operating pressure, pesticide characteristics, membrane materials, feed solution and draw solution affect the performance of thin film composite membranes on pesticides removal. The membrane separation discussed in this review involve nanofiltration (NF), reverse osmosis (RO) and forward osmosis processes (FO) (i.e., FO mode and pressure retarded osmosis (PRO) mode). High pressure shows positive effects on NF and RO membranes flux performances, but it could deform PRO membranes. Hydrophobic pesticides that are larger in size, negatively charged with small dipole moments will result in higher retention. Besides, ions in the feed solution increased the rejection efficiency and permeate flux of membrane whereas pesticides concentration has a negative effect on their retention. pH of feed solution determines the zeta potential of membrane. As for the draw solution, NaCl at higher concentration is recommended. This paper is crucial to give an overview on ways to improve the removal of pesticides with various thin film composite membranes.

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Preparation, characterization and scaling propensity study of a dopamine incorporated RO/FO TFC membrane for pesticide removal

Cited by 27 publications

References 59 publications

Nanofiltration‐like forward osmosis membranes on in‐situ mussel‐modified polyvinylidene fluoride porous substrate for efficient salt/dye separation

Nanofiltration‐like forward osmosis membranes on in‐situ mussel‐modified polyvinylidene fluoride porous substrate for efficient salt/dye separation

Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes

Critical Evaluation of Thin Film Composite Membrane on Pesticide Removal

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