Chlorite formation during ClO2 oxidation of model compounds having various functional groups and humic substances

Gan, Wenhui; Huang, Sirong; Ge, Yuexian; Bond, Tom; Westerhoff, Paul; Zhai, Jiaxin; Yang, Xin

doi:10.1016/j.watres.2019.05.020

Cited by 65 publications

(25 citation statements)

References 49 publications

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“…It can be seen from the chemical analysis (Table 1), alternating pretreatment with acidified NaClO 2 and alkali caused the cellulose content in FC, LC, PC and AC increase from 31.23%, 33.56%, 33.95% and 30.25% to 96.23%, 97.11%, 97.29% and 96.63%, respectively and these values are in agreement with those reported in the previous literature 49 . Acidic NaClO 2 oxidized the benzene ring and double bond structure of lignin, then decomposed them in the SEFSs 50 . While hot alkali dissolved large amounts of hemicellulose and lignin, meanwhile, water molecules had a wetting and swelling effect on the cellulose, which swelled the inner space of the fibers, promoting fiber separation, and providing convenience for the subsequent chemical reaction treatment in this process 51 .…”

Section: Resultssupporting

confidence: 92%

“…49 Acidic NaClO 2 oxidized the benzene ring and double bond structure of lignin, then decomposed them in the SEFSs. 50 While hot alkali dissolved large amounts of hemicellulose and lignin, meanwhile, water molecules had a wetting and swelling effect on the cellulose, which swelled the inner space of the fibers, promoting fiber separation, and providing convenience for the subsequent chemical reaction treatment in this process. 51 The cellulose content in the SEFSs of the first harvested was equivalent to that of agricultural straw wastes, which was consistent with the study of Pérez-Chávez et al, 29 and it also showed that the fungal mycelium did not significantly degrade the first harvested substrates of edible fungus.…”

Section: Composition and Yield Analysismentioning

confidence: 99%

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Preparation and characterization of cellulose nanocrystals from spent edible fungus substrate

Yang

Liu

et al. 2021

J Sci Food Agric

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BACKGROUND Spent edible fungus substrates were identified as potential sources to produce cellulose derivatives, namely purified cellulose and dicarboxyl cellulose nanocrystal (DCNC). Purified celluloses were obtained via chemical treatments and then oxidized by sequential periodate‐chlorite without mechanical process. The structural properties of the DCNCs were characterized by transmission electron microscopy (TEM), Fourier‐transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD) and thermal gravimetric analysis (TGA). RESULTS XRD results showed that the cellulose I structure was maintained, however, the crystallinity index decreased after oxidation process. The initial pyrolysis temperature of DCNCs ranged from 242 to 344 °C. TEM results revealed that DCNC was rod‐shaped with an average length and width of 130.88 nm and 7.3 nm, respectively. The average specific surface area (SSA) was 366.67 m2 g–1. The carboxyl content was around 3.485 mmol g–1. Finally, the adsorption capacity for contaminations was 76.98, 126.22, 64.44 and 9.63 mg g–1 for copper ion (Cu2+), lead ion (Pb2+), chromium (Cr3+) and amoxicillin (AMX), respectively. CONCLUSION This work showed a sequentially chemical oxidation for preparing nanocellulose from secondary agricultural waste with many functional applications. © 2021 Society of Chemical Industry.

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Section: Resultssupporting

confidence: 92%

Section: Composition and Yield Analysismentioning

confidence: 99%

Preparation and characterization of cellulose nanocrystals from spent edible fungus substrate

Yang

Liu

et al. 2021

J Sci Food Agric

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“…Understanding DOM transformation during chlorine photolysis provides insight into mechanisms of reaction during water treatment. , For example, the composition of DOM determines its DBP formation potential. ,− Therefore, changes in DOM composition during chlorine photolysis through a combination of direct photolysis, dark chlorination, or reaction with reactive oxidants might alter its reactivity with chlorine in distribution systems. ,, DOM composition following dark chlorination, direct photolysis, chlorine photolysis, and chlorine photolysis with a radical scavenger is investigated using UV–visible spectroscopy and high-resolution mass spectrometry to identify how chlorine, light, and reactive oxidants contribute to DOM alteration.…”

Section: Resultsmentioning

confidence: 99%

Role of Reactive Halogen Species in Disinfection Byproduct Formation during Chlorine Photolysis

Bulman

Remucal

2020

Environ. Sci. Technol.

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The multiple reactive oxidants produced during chlorine photolysis effectively degrade organic contaminants during water treatment, but their role in disinfection byproduct (DBP) formation is unclear. The impact of chlorine photolysis on dissolved organic matter (DOM) composition and DBP formation is investigated using lake water collected after coagulation, flocculation, and filtration at pH 6.5 and pH 8.5 with irradiation at three wavelengths (254, 311, and 365 nm). The steady-state concentrations of hydroxyl radical and chlorine radical decrease by 38–100% in drinking water compared to ultrapure water, which is primarily attributed to radical scavenging by natural water constituents. Chlorine photolysis transforms DOM through multiple mechanisms to produce DOM that is more aliphatic in nature and contains novel high molecular weight chlorinated DBPs that are detected via high-resolution mass spectrometry. Quenching experiments demonstrate that reactive chlorine species are partially responsible for the formation of halogenated DOM, haloacetic acids, and haloacetonitriles, whereas trihalomethane formation decreases during chlorine photolysis. Furthermore, DOM transformation primarily due to direct photolysis alters DOM such that it is more reactive with chlorine, which also contributes to enhanced formation of novel DBPs during chlorine photolysis.

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“…Throughout these last three decades, a lot of work has been done on DBPs identification [32] and some reviews on this matter have been published [47]. Also, published studies report works not only on DBPs identified from chlorination [48], but also from chloramination [49,50], ozonation [32], and chlorine dioxide NOM oxidation [51,52]. Most of identified DBPs come from water chlorination and mainly involve organochlorine compounds but some treat the presence of brominated (Br-DBPs) and iodinated (I-DBPs) DBPs formed from chlorine, ozone or chlorine dioxide when natural waters contain bromide or iodide, respectively [32,53].…”

Section: Nature Of Dbps From Classical Oxidant-disinfectants Agents U...mentioning

confidence: 99%

The Role of Catalytic Ozonation Processes on the Elimination of DBPs and Their Precursors in Drinking Water Treatment

2021

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Formation of disinfection byproducts (DBPs) in drinking water treatment (DWT) as a result of pathogen removal has always been an issue of special attention in the preparation of safe water. DBPs are formed by the action of oxidant-disinfectant chemicals, mainly chlorine derivatives (chlorine, hypochlorous acid, chloramines, etc.), that react with natural organic matter (NOM), mainly humic substances. DBPs are usually refractory to oxidation, mainly due to the presence of halogen compounds so that advanced oxidation processes (AOPs) are a recommended option to deal with their removal. In this work, the application of catalytic ozonation processes (with and without the simultaneous presence of radiation), moderately recent AOPs, for the removal of humic substances (NOM), also called DBPs precursors, and DBPs themselves is reviewed. First, a short history about the use of disinfectants in DWT, DBPs formation discovery and alternative oxidants used is presented. Then, sections are dedicated to conventional AOPs applied to remove DBPs and their precursors to finalize with the description of principal research achievements found in the literature about application of catalytic ozonation processes. In this sense, aspects such as operating conditions, reactors used, radiation sources applied in their case, kinetics and mechanisms are reviewed.

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Chlorite formation during ClO2 oxidation of model compounds having various functional groups and humic substances

Cited by 65 publications

References 49 publications

Preparation and characterization of cellulose nanocrystals from spent edible fungus substrate

Preparation and characterization of cellulose nanocrystals from spent edible fungus substrate

Role of Reactive Halogen Species in Disinfection Byproduct Formation during Chlorine Photolysis

The Role of Catalytic Ozonation Processes on the Elimination of DBPs and Their Precursors in Drinking Water Treatment

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