Reduction-induced aggregation of manganese dioxide colloids by guaiacol

Huangfu, Xiaoliu; Jiang, Jin; Wang, Yaan; Liu, Yongze; Pang, Shengyong; Lu, Xixin; Zhang, Xiang; Cheng, Haijun

doi:10.1016/j.colsurfa.2014.10.034

Cited by 12 publications

(8 citation statements)

References 37 publications

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“…1d), 4-nitroguaiacol (Fig. 1e)) clearly showed a three-stage aggregation behavior as observed in our previous study [20]. As can be seen in Fig.…”

Section: Reduction-induced Aggregation Of Mno 2 Colloids In the Presesupporting

confidence: 65%

“…Moreover, the interactions between Mn(II/III) and MnO 2 colloids may differ depending on their organic structure. Our recent work found that reduction-induced aggregation of nMnO 2 accompanying their dissolution in the presence of guaiacol [20]. In order to predict the stability and mobility of both MnO 2 colloids and the Mn(II/III) produced in the presence of organics with related structures, the influence of their structure on their aggregation and/or dissolution must be known.…”

Section: Introductionmentioning

confidence: 99%

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Reduction-induced aggregation and/or dissolution of MnO2 colloids by organics

Huangfu

Jiang

Wang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…1d), 4-nitroguaiacol (Fig. 1e)) clearly showed a three-stage aggregation behavior as observed in our previous study [20]. As can be seen in Fig.…”

Section: Reduction-induced Aggregation Of Mno 2 Colloids In the Presesupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Reduction-induced aggregation and/or dissolution of MnO2 colloids by organics

Huangfu

Jiang

Wang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Guaiacol oxidation by oxidized manganese minerals feitknechtite (β-MnOOH) and birnessite (δ-MnO 2 ), resulting in the formation of soluble Mn 2+ , has been established in the literature. 35,36 Collectively, the results indicate that guaiacol can be readily oxidized by MnO 2 and other oxidized mineral forms of manganese. −• , play an important role in iron oxide-catalyzed halogenation of guaiacol by various halides.…”

Section: Resultsmentioning

confidence: 86%

“…Furthermore, guaiacol concentrations decreased when incubated with MnO 2 , regardless of whether halides were present (Figure S7). Guaiacol oxidation by oxidized manganese minerals feitknechtite (β-MnOOH) and birnessite (δ-MnO 2 ), resulting in the formation of soluble Mn 2+ , has been established in the literature. , Collectively, the results indicate that guaiacol can be readily oxidized by MnO 2 and other oxidized mineral forms of manganese.…”

Section: Resultsmentioning

confidence: 91%

The Role of Manganese Dioxide in the Natural Formation of Organochlorines

et al. 2021

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Organochlorines are important environmental contaminants that impact ecosystems, public health, and global warming. Organochlorines are generally regarded as anthropogenic compounds, but they also have natural sources. Here, we report that the commonly occurring manganese(IV) secondary mineral birnessite (δ-MnO 2 ) was found to chlorinate guaiacol (2-methoxyphenol), a moiety in lignocellulose and hence plant-derived natural organic matter (NOM). Environmentally relevant concentrations of birnessite and chloride were incubated together with guaiacol for 18 min at pH 4.0, resulting in the formation of up to 118 μg L −1 of chloroguaiacols. The extent of chlorination was dependent on the chloride concentration. Conducting these reactions under anoxic conditions had little effect on chloroguaiacol formation, suggesting that oxygen is not required in the MnO 2 -mediated chlorination of guaiacol. This study demonstrates that ubiquitous MnO 2 catalyzes the formation of chlorinated NOM, revealing a globally important source of natural organochlorines that has previously been overlooked. The MnO 2 -mediated mechanism can account for the previous detection of organochlorines in forest soils, where accumulation of manganese is known to occur during the decomposition of wood and leaf litter.

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“…Aggregation and deposition behaviors are the major reasons for the transport of colloids and nanoparticles in an aqueous environment . For aggregation behaviors, the influence of environmental conditions, such as monovalent and divalent cations, various natural organic matters (i.e., Suwannee River fulvic acid (SRFA), Suwannee River humic acid (SRHA), alginate, and bovine serum albumin (BSA)), and redox processes have been reported in our previous studies. − For deposition kinetics, the deposition of colloidal MnO 2 onto three representative interfaces (i.e., SiO 2 , Fe 3 O 4 , and Al 2 O 3 ) in a sodium nitrate solution and the effects of HA, alginate, and BSA have also been investigated . We found that in the absence of macromolecules, the aggregation and deposition behaviors of colloidal MnO 2 were greatly consistent with the classical Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, which involves van der Waals forces (vdW) and electrical double layer forces (EDL) to interpret the interaction forces among the particles or between the particles and interfaces.…”

Section: Introductionmentioning

confidence: 95%

Transport Behaviors of Colloidal Manganese Dioxide in Aqueous Media: Effects of Ionic Specificity of Monovalent Cations

Huang

et al. 2020

J. Phys. Chem. C

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The influence of ionic strength on the transport behaviors of natural or engineered colloids has been widely studied in recent years, and the explanatory classical Derjaguin−Landau− Verwey−Overbeek (DLVO) theory has also been employed in many studies. However, ion-specific effects were barely applied to interpret the contradiction between the experimental observations and classical DLVO predictions when nanoparticle or colloidal aggregation and deposition took place in different cationic solutions. In this study, the effects of ionic specificity of the firstgroup monovalent cations (i.e., Li + , Na + , K + , and Rb + ), and the influence of representative polysaccharides (alginate) and proteins (bovine serum albumin (BSA), on the aggregation and deposition behaviors of colloidal manganese dioxide (MnO 2 ) onto silica (SiO 2 ) and iron (Fe 3 O 4 ) surfaces were systematically studied by employing time-resolved dynamic light scattering (DLS) and a quartz crystal microbalance with dissipation monitoring (QCM-D), respectively. Experimental results indicated that the additive cations with a poorer hydration degree (e.g., Rb + ) were more efficient in promoting the aggregation, hindering the deposition kinetics of colloidal MnO 2 . This could be quantitatively interpreted with the modified DLVO theory, through the introduction of additional short-range repulsion, which was generated from a hydration force between colloids and interfaces. Moreover, BSA was more efficient in hindering the aggregation of colloidal MnO 2 than alginate. Furthermore, BSA could enhance the deposition of MnO 2 while alginate exhibited the opposite effect. These results revealed the significance of ionic specificity in the aggregation and deposition behaviors of MnO 2 colloids and provided insights into understanding the role of counterion hydration in the transport and fate of engineering nanoparticles (ENPs) in an aquatic environment.

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Reduction-induced aggregation of manganese dioxide colloids by guaiacol

Cited by 12 publications

References 37 publications

Reduction-induced aggregation and/or dissolution of MnO2 colloids by organics

Reduction-induced aggregation and/or dissolution of MnO2 colloids by organics

The Role of Manganese Dioxide in the Natural Formation of Organochlorines

Transport Behaviors of Colloidal Manganese Dioxide in Aqueous Media: Effects of Ionic Specificity of Monovalent Cations

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