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1. Performance evaluation of interfacial polymerisation-fabricated aquaporin-based biomimetic membranes in forward osmosis

Author:
Liang, Zhixia; Yun, Yanbin; Wang, Manxiang; Liu, Guicheng; Lu, Peng; Yang, Woochul; Li, Chunli
Source:
RSC advances 2019 v.9 no.19 pp. 10715-10726
ISSN:
2046-2069
Subject:
sodium hypochlorite,   etc   ; aquaporins; artificial membranes; heat treatment; osmosis; polyamides; polymerization;     Show all 7 Subjects
Abstract:
... Aquaporins play a promising role in the fabrication of high-performance biomimetic membranes. Interfacial polymerisation is a promising strategy for synthesizing aquaporin-based membranes. In this study, robust and high-performance aquaporin-based biomimetic membranes were successfully fabricated by interfacial polymerisation, and the membrane separation performance and interfacial polymerisation ...
DOI:
10.1039/c9ra00787c

2. Reaction of thieno[2,3-b]pyridines with sodium hypochlorite: An unusual and stereoselective one-pot approach to dimeric pyrrolo[2′,3′:4,5]thieno[2,3-b]pyridines

Author:
Stroganova, Tatyana A.; Vasilin, Vladimir K.; Dotsenko, Victor V.; Aksenov, Nikolai A.; Krapivin, Gennady D.
Source:
Tetrahedron letters 2019
ISSN:
0040-4039
Subject:
sodium hypochlorite,   etc   ; bleaching agents; chemical structure; oxidation; pyridines; stereoselectivity;     Show all 6 Subjects
Abstract:
... The oxidation of 3-aminothieno[2,3-b]pyridine-2-carboxamides with commercially available bleach leads to the formation of dimeric pyrrolo[2′,3′:4,5]thieno[2,3-b]pyridines (7a,14a-diamino-7,14-bis(aryl)-7,7a,14,14a-tetrahydro-6H,13H-pyrido[3″″,2″″:4‴,5‴]thieno[2‴,3‴:4″,5″]pyrrolo-[3″,4″:3′,4′]pyrrolo[2′,3′:4,5]thieno[2,3-b]pyridine-6,13-diones) in moderate yields (37–52%). ...
DOI:
10.1016/j.tetlet.2019.03.012

3. Investigation of Poly(ethersulfone)/Polyvinylpyrrolidone ultrafiltration membrane degradation by contact with sodium hypochlorite through FTIR mapping and two-dimensional correlation spectroscopy

Author:
Chokki, J.; Darracq, G.; Poelt, P.; Baron, J.; Gallard, H.; Joyeux, M.; Teychené, B.
Source:
Polymer degradation and stability 2019 v.161 pp. 131-138
ISSN:
0141-3910
Subject:
sodium hypochlorite,   etc   ; Fourier transform infrared spectroscopy; chlorine; oxidation; pH; ultrafiltration;     Show all 6 Subjects
Abstract:
... It is well recognized that chlorine is responsible for aging of membrane materials. The goal of this study is to investigate the modifications of a commercial PES/PVP hollow fiber membrane exposed to hypochlorite solution at pH 7.5 by continuous filtration. Thanks to ATR-FTIR 2D Correlation Spectroscopy (2DCoS) analysis it was confirmed that PVP is oxidized into succinimide compound. 2DCoS analysi ...
DOI:
10.1016/j.polymdegradstab.2019.01.017

4. Effects of sodium hypochlorite concentration on the methanogenic activity in an anaerobic fluidized membrane bioreactor

Author:
Lee, Eunseok; Rout, Prangya Ranjan; Shin, Chungheon; Bae, Jaeho
Source:
The Science of the total environment 2019 v.678 pp. 85-93
ISSN:
0048-9697
Subject:
sodium hypochlorite,   etc   ; activated carbon; biofilm; biomass; cleaning; liquids; membrane bioreactors; methane production; toxicity;     Show all 9 Subjects
Abstract:
... The effect of membrane cleaning chemical, NaOCl on specific acetoclastic methanogenic activity (SAMA) of biomass in the anaerobic fluidized membrane bioreactors (AFMBRs) was assessed. Granular activated carbon (GAC) was used as a fluidizing media in the AFMBR to provide membrane scouring effect and surface for biofilm attachment. Effect of NaOCl on methane production was negligible for GAC with bi ...
DOI:
10.1016/j.scitotenv.2019.04.396

5. Fate of NaClO and membrane foulants during in-situ cleaning of membrane bioreactors: Combined effect on thermodynamic properties of sludge

Author:
Zhang, Haifeng; Sun, Ming; Song, Lianfa; Guo, Jingbo; Zhang, Lanhe
Source:
Biochemical engineering journal 2019 v.147 pp. 146-152
ISSN:
1369-703X
Subject:
sodium hypochlorite,   etc   ; cleaning; filtration; fouling; hydrophobicity; membrane bioreactors; polymers; sludge; thermodynamics;     Show all 9 Subjects
Abstract:
... In this study, the fate of sodium hypochlorite (NaClO) and detached membrane foulants and their impacts on the thermodynamic properties of raw sludge were investigated in a membrane bioreactor (MBR). It was found that about 20.3% of the total NaClO was potentially released into the bulk sludge, which significantly altered the raw sludge surface properties, such as a reduction in the number of surf ...
DOI:
10.1016/j.bej.2019.04.016

6. Transferring bulk chemistry to interfacial synthesis of TFC-membranes to create chemically robust poly(epoxyether) films

Author:
Verbeke, Rhea; Arts, Wouter; Dom, Elke; Dickmann, Marcel; Egger, Werner; Koeckelberghs, Guy; Szymczyk, Anthony; Vankelecom, Ivo F.J.
Source:
Journal of membrane science 2019 v.582 pp. 442-453
ISSN:
0376-7388
Subject:
sodium hypochlorite,   etc   ; artificial membranes; crosslinking; industry; methyl orange; nanofiltration; pH; polymerization;     Show all 8 Subjects
Abstract:
... Membrane technology is currently still excluded from separations in more aggressive feeds due to limited chemical robustness. To extent its applicability, a novel thin-film composite (TFC) membrane was synthesized via the homopolymerization of epoxide monomers, resulting in robust poly(epoxyether) top-layers with >90% rose bengal (MW = 1017 Da) and 70% methyl orange (MW = 327 Da) retention with re ...
DOI:
10.1016/j.memsci.2019.02.016

7. Effect of scrubbing by NaClO backwashing on membrane fouling in anammox MBR

Author:
Jiang, Chu-Kuan; Tang, Xi; Tan, Hao; Feng, Fan; Xu, Zhao-Meng; Mahmood, Qaisar; Zeng, Weizhi; Min, Xiao-Bo; Tang, Chong-Jian
Source:
The Science of the total environment 2019 v.670 pp. 149-157
ISSN:
0048-9697
Subject:
sodium hypochlorite,   etc   ; anaerobic ammonium oxidation; cleaning; fouling; guidelines; membrane bioreactors; membrane permeability; oxidation; polysaccharides; sludge; washing;     Show all 11 Subjects
Abstract:
... NaClO based chemically enhanced backwash (CEB) is often administered to maintain membrane permeability during the operation of MBR. However, the effect and working mechanism of NaClO concentrations in CEB were rarely investigated. The current investigation examined the changes in membrane resistance, permeate production and membrane morphology with or without CEB in an anammox MBR to reveal the sc ...
DOI:
10.1016/j.scitotenv.2019.03.170

8. Bioplastic recovery from wastewater: A new protocol for polyhydroxyalkanoates (PHA) extraction from mixed microbial cultures

Author:
Mannina, Giorgio; Presti, Dario; Montiel-Jarillo, Gabriela; Suárez-Ojeda, María Eugenia
Source:
Bioresource technology 2019 v.282 pp. 361-369
ISSN:
0960-8524
Subject:
sodium hypochlorite,   etc   ; biomass; bioplastics; dodecanoic acid; oils; polyhydroxyalkanoates; temperature; waste utilization; wastewater;     Show all 9 Subjects
Abstract:
... A new protocol for polyhydroxyalkanoates (PHA) extraction from mixed microbial cultures (MMCs) is proposed. PHA-accumulating capacity of the MMC was selected in a sequencing batch reactor (SBR) fed with a synthetic effluent emulating a fermented oil mill wastewater (OMW). The highest recovery yield and purity (74 ± 8% and 100 ± 5%, respectively) was obtained when using NH4-Laurate for which operat ...
DOI:
10.1016/j.biortech.2019.03.037

9. Chlorine-resistant sulfochlorinated and sulfonated polysulfone for reverse osmosis membranes by coating method

Author:
Zhao, Yali; Dai, Lei; Zhang, Qifeng; Zhou, Shengyang; Zhang, Suobo
Source:
Journal of colloid and interface science 2019 v.541 pp. 434-443
ISSN:
0021-9797
Subject:
sodium hypochlorite,   etc   ; chlorine; crosslinking; desalination; hydrophilicity; piperazine; polyamides; reverse osmosis; sodium chloride; surfactants; tetrabutylammonium compounds;     Show all 11 Subjects
Abstract:
... In this work, sulfochlorinated polysulfone (SC-PSf), a functional polysulfone with chlorine resistance, was synthesized through metalation sulfochlorination of polysulfone (PSf). For endowing the required hydrophilicity of SC-PSf, the sulfonyl chloride groups on SC-PSf were partially hydrolyzed to sulfonic groups to produce sulfonated SC-PSf (SC-S-PSf). Thin film composite (TFC) membranes for reve ...
DOI:
10.1016/j.jcis.2019.01.104

10. 3D printed composite membranes with enhanced anti-fouling behaviour

Author:
Al-Shimmery, Abouther; Mazinani, Saeed; Ji, Jing; Chew, Y.M. John; Mattia, Davide
Source:
Journal of membrane science 2019 v.574 pp. 76-85
ISSN:
0376-7388
Subject:
sodium hypochlorite,   etc   ; Reynolds number; asymmetric membranes; cleaning; emulsions; fouling; industrial applications; oils; permeability; ultrafiltration;     Show all 10 Subjects
Abstract:
... The fabrication of three dimensional (3D) printed composite membranes by depositing a thin polyethersulfone (PES) selective layer onto ABS-like 3D printed flat and wavy structured supports is presented here for the first time. The 50 mm disk supports were printed using an industrial 3D printer with both flat and double sinusoidal, i.e. wavy, surface structures. The thin selective layers were depos ...
DOI:
10.1016/j.memsci.2018.12.058

11. Intensive membrane cleaning for MBRs equipped with flat-sheet ceramic membranes: Controlling negative effects of chemical reagents used for membrane cleaning

Author:
Kimura, Katsuki; Uchida, Hiroki
Source:
Water research 2019 v.150 pp. 21-28
ISSN:
0043-1354
Subject:
sodium hypochlorite,   etc   ; artificial membranes; biomass; ceramics; cleaning; fouling; gels; granules; membrane bioreactors; polyurethanes; wastewater;     Show all 11 Subjects
Abstract:
... Intensive membrane cleaning can be used with ceramic membranes since they are physically/chemically robust. It might therefore be possible for membrane bioreactors (MBRs) to be operated under the condition of a high membrane flux when ceramic membranes are used with such intensive membrane cleaning. In this study, bench-scale MBRs equipped with flat-sheet ceramic membranes were operated for long p ...
DOI:
10.1016/j.watres.2018.11.030

12. New insights into the rapid formation of initial membrane fouling after in-situ cleaning in a membrane bioreactor

Author:
Sun, Ming; Yan, Linlin; Zhang, Lanhe; Song, Lianfa; Guo, Jingbo; Zhang, Haifeng
Source:
Process biochemistry 2019 v.78 pp. 108-113
ISSN:
1359-5113
Subject:
sodium hypochlorite,   etc   ; cleaning; energy; filterability; fouling; hydrophobicity; membrane bioreactors; permeability; protein content; sludge;     Show all 10 Subjects
Abstract:
... In-situ chemical cleaning with sodium hypochlorite (NaClO) is often employed for maintaining constant permeability in a membrane bioreactor (MBR). In this study, the effect of NaClO shock on the rapid formation of initial membrane fouling was investigated over the course of the in-situ cleaning of a MBR. Variations of trans-membrane pressure (TMP) in the different runs indicated that the bulk slud ...
DOI:
10.1016/j.procbio.2019.01.004

13. Reduction of Listeria innocua in fresh-cut Chinese cabbage by a combined washing treatment of sweeping frequency ultrasound and sodium hypochlorite

Author:
Alenyorege, Evans Adingba; Ma, Haile; Ayim, Ishmael; Aheto, Joshua Harrington; Hong, Chen; Zhou, Cunshan
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2019 v.101 pp. 410-418
ISSN:
0023-6438
Subject:
sodium hypochlorite,   etc   ; Chinese cabbage; Listeria innocua; color; fresh-cut produce; leaves; microstructure; pigments; texture; washing;     Show all 10 Subjects
Abstract:
... The investigation compared the efficiency of single treatments and their combinations in reducing Listeria innocua on fresh-cut Chinese cabbage. Samples were inoculated and treated separately with sweeping frequency ultrasound (SFUS; 28 ± 2–68 ± 2 kHz) and sodium hypochlorite solution (NaOCl; 20–100 mg/L) and their combinations. Treatments were evaluated based on attainable bacterial reduction and ...
DOI:
10.1016/j.lwt.2018.11.048

14. Transformation of norfloxacin during the chlorination of marine culture water in the presence of iodide ions

Author:
Pan, Zihan; Zhu, Yunjie; Li, Leiyun; Shao, Yanan; Wang, Yinghui; Yu, Kefu; Zhu, Hongxiang; Zhang, Yuanyuan
Source:
Environmental pollution 2019 v.246 pp. 717-727
ISSN:
0269-7491
Subject:
sodium hypochlorite,   etc   ; antibiotics; bromination; byproducts; chlorination; disinfection; freshwater; iodine; ions; norfloxacin; oxidation; reaction kinetics; seawater; toxicity;     Show all 14 Subjects
Abstract:
... The antibacterial agent norfloxacin (NOR) and sodium hypochlorite (NaClO), which are both widely used in marine culture, react with each other to form the halogenated disinfection byproducts (X-DBPs). The effects of the water characteristics and iodide concentration on the reaction kinetics were investigated. The results showed that the reaction rate of NOR with NaClO increases from 0.0586 min−1 t ...
DOI:
10.1016/j.envpol.2018.12.058

15. A new sight on the catalytic oxidation kinetic behaviors of bamboo cellulose fibers under TEMPO-oxidized system: The fate of carboxyl groups in treated pulps

Author:
Guan, Qingqing; Chen, Jiajing; Chen, Dong; Chai, Xinsheng; He, Liang; Peng, Lincai; Zhang, Junhua; Li, Jing
Source:
Journal of catalysis 2019 v.370 pp. 304-309
ISSN:
0021-9517
Subject:
sodium hypochlorite,   etc   ; bamboos; cellulosic fibers; kinetics; models; moieties; oxidation; sodium bromide; temperature;     Show all 9 Subjects
Abstract:
... This article conducted an investigation on the selective oxidation of C6-OH in cellulosic chains during TEMPO-oxidized process of bamboo pulps under different conditions, from which the kinetic behaviors and model for describing the fate of carboxyl groups in treated pulps were studied. It was found that the end concentration of carboxyl groups in treated pulps is mainly affected by the time-depen ...
DOI:
10.1016/j.jcat.2019.01.003

16. Optimization of Surface Treatment Using Sodium Hypochlorite Facilitates Coseparation of ABS and PC from WEEE Plastics by Flotation

Author:
Wang, Jianchao; Wang, Hui; Yue, Dongbei
Source:
Environmental science & technology 2019 v.53 no.4 pp. 2086-2094
ISSN:
1520-5851
Subject:
sodium hypochlorite,   etc   ; electronic wastes; experimental design; mixing; models; plastics; prediction; recycling; response surface methodology; styrene; temperature;     Show all 11 Subjects
Abstract:
... Waste acrylonitrile butadiene styrene (ABS) and polycarbonate (PC) as dominant components in waste electrical and electronic equipment (WEEE) plastics show significant potential for recycling, which is severely restricted by efficient separation method. We proposed a novel surface treatment method using sodium hypochlorite for facilitating coseparation of ABS and PC from WEEE plastics by flotation ...
DOI:
10.1021/acs.est.8b06432

17. Simulation of membrane ageing to go ahead in fouling and cleaning understanding during skim milk ultrafiltration

Author:
Rabiller-Baudry, Murielle; Thomas, Patrick; Nguyen, Thi Khan Huyen; Girard, Jean; El Mansour El Jastimi, Massoud; Loulergue, Patrick
Source:
Food and bioproducts processing 2019 v.113 pp. 22-31
ISSN:
0960-3085
Subject:
sodium hypochlorite,   etc   ; cleaning; dairy industry; detergents; disinfection; fouling; skim milk; ultrafiltration;     Show all 8 Subjects
Abstract:
... In dairy industry, the mastering of membrane fouling and cleaning remains a bottleneck of membrane processes especially for aged and degraded membranes. This paper reports an in-depth study of the impact of membrane chemical ageing due to NaOCl disinfection on the fouling and cleaning of PES/PVP membranes.Fouling by skim milk was performed at critical and limiting flux found to have an impact on t ...
DOI:
10.1016/j.fbp.2018.10.004

18. Selective, Catalytic, and Dual C(sp³)–H Oxidation of Piperazines and Morpholines under Transition-Metal-Free Conditions

Author:
Chamorro-Arenas, Delfino; Osorio-Nieto, Urbano; Quintero, Leticia; Hernández-García, Luís; Sartillo-Piscil, Fernando
Source:
Journal of organic chemistry 2018 v.83 no.24 pp. 15333-15346
ISSN:
1520-6904
Subject:
sodium hypochlorite,   etc   ; chemical structure; morpholine; organic chemistry; oxidation; piperazines;     Show all 6 Subjects
Abstract:
... By using cheap and innocuous reagents, such as NaClO₂, NaOCl, and catalytic amounts of TEMPO, a new environmentally friendly protocol for the selective and catalytic TEMPO C(sp³)–H oxidation of piperazines and morpholines to 2,3-diketopiperazines (2,3-DKP) and 3-morpholinones (3-MPs), respectively, has been developed. This novel direct access to 2,3-DKP from piperazines provides significant advant ...
DOI:
10.1021/acs.joc.8b02564

19. Transition metal free large-scale synthesis of aromatic vinyl chlorides from aromatic vinyl carboxylic acids using bleach

Author:
Hatvate, Navnath T.; Takale, Balaram S.; Ghodse, Shrikant M.; Telvekar, Vikas N.
Source:
Tetrahedron letters 2018 v.59 no.43 pp. 3892-3894
ISSN:
0040-4039
Subject:
sodium hypochlorite,   etc   ; bleaching agents; carboxylic acids; chlorination; moieties; organochlorine compounds;     Show all 6 Subjects
Abstract:
... While continuing our research on Hunsdiecker reaction, we came across an interesting application of bleach, sodium hypochlorite (NaOCl) for decarboxylative chlorination reaction. The reaction is easily scaled up to 10 mmol. The reaction has good tolerance towards wide variety of functional groups. The reaction has mild conditions and gave relatively high chemical yield of the desired product. ...
DOI:
10.1016/j.tetlet.2018.09.034

20. A metal-catalyst-free oxidative coupling of anilines to aromatic azo compounds in water using bleach

Author:
de Souza, Gabriela F.P.; von Zuben, Theodora W.; Salles, Airton G.
Source:
Tetrahedron letters 2018 v.59 no.42 pp. 3753-3755
ISSN:
0040-4039
Subject:
sodium hypochlorite,   etc   ; azo compounds; bleaching agents; chemical reactions; chemical structure;     Show all 5 Subjects
Abstract:
... A simple route toward the synthesis of symmetrical and unsymmetrical aromatic azo compounds through oxidative coupling of anilines using widely available NaOCl is presented. This metal catalyst-free protocol is performed in water and affords the desired products in high yields. ...
DOI:
10.1016/j.tetlet.2018.08.053