Solution pH affects single, sequential and binary systems of sulfamethoxazole and cadmium adsorption by self-assembled cellulose: Promotion or inhibition?

Zhang, Tao; Zheng, Liuchun; Yu, Huajian; Ren, Jingjing; Zhang, Lijuan; Meng, Peipei; Peng, Dan

doi:10.1016/j.jhazmat.2020.124084

Cited by 39 publications

(7 citation statements)

References 59 publications

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“…N1, C2, C5, and N13 with larger f (0) sites are susceptible to a radical attack. The highest occupied molecular orbitals (HOMO), as well as lowest unoccupied molecular orbitals (LUMO) of SMX, which represent the electron-donating and -accepting capabilities, , are displayed in Figure b,c, respectively. The N1, N11, C2, C7, and O14 atoms around the benzene as well as the aniline ring were most susceptible to oxidation by electrophilic radicals.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy-Dominated Activation of Chlorite and Oxidative Degradation of Sulfamethoxazole

Song,

Su,

et al. 2024

ACS EST Eng.

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Oxygen vacancy-rich bismuth oxyhalides (BiOX, where X = Cl, Br, I) were successfully synthesized as heterogeneous catalysts for efficiently activating chlorite to produce chlorine dioxide (ClO 2 ) as the prevailing reactive oxidized species (ROS) for sulfamethoxazole (SMX) degradation. Material characterization and density functional theory (DFT) calculations show that BiOI possesses the highest oxygen vacancies, which act as highly active sites. Oxygen vacancies (OVs) not only absorb chlorite but also improve the internal electron conduction efficiency between chlorite and metal ions. The best removal of SMX (84.3%) was achieved under neutral conditions using 70 mg of BiOI and 0.1 mM chlorite. It was discovered that ClO 2 is the primary ROS, which was generated via two reactions that involved the formation of HOCl and Bi(IV). The minimal change in acute toxicity and the well-maintained performance in degrading pollutants indicated the potential practical applications of the BiOI/chlorite system. This work reveals a unique mechanism for the OV-mediated activation of chlorite, which highlights the potential advantages of activation via heterogeneous metal oxides BiOX and supplies a new viewpoint for the activation of chlorite for contaminant degradation.

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Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy-Dominated Activation of Chlorite and Oxidative Degradation of Sulfamethoxazole

Song,

Su,

et al. 2024

ACS EST Eng.

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“…), the highest occupied molecular orbital (HOMO, representing the electron-donating ability), and the lowest unoccupied molecular orbital (LUMO, representing the electron-accepting ability). 48,49 Computational details are presented in Text S6.…”

Section: Analysis Of Smx Active Sites By Density Functional Theory (Dft)mentioning

confidence: 99%

Fe(IV)═O/Fe(V)═O and [Fe_aq^IVO]²⁺/[Fe_aq^VO]³⁺ Cooperating with Free Radicals Induced High-Rate Sulfamethoxazole-Cr(VI) Simultaneous Removal in a Fe₇S₈-Persulfate Micro/Nanocatalytic System

Li,

Wang,

Fan

et al. 2024

ACS EST Eng.

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Conventional persulfate-based (PS-based) catalytic systems that resolve single-pollutant sulfamethoxazole (SMX) problems depend on free radicals. However, research on the contribution or cooperative effect of nonfree radical Fe(IV)/Fe(V) species and the interaction of cocontamination Cr(VI)-SMX has not been sufficiently elucidated. The production source of the Fe(IV)/ Fe(V) species requires further exploration and expansion. Here, a pyrrhotite-PS (Fe 7 S 8 -PS) micro/nanocatalytic system was independently constructed to stimulate the production of Fe(IV)/Fe(V) species, which were identified by Mossbauer spectroscopy. In the Fe(IV)/Fe(V) species cooperating with the freeradical-induced high-rate reaction system, k SMX (0.0304 min −1 ) raised 152.0 times to k SMX (0.0002 min −1 ) in the sole Fe 7 S 8 system. SMX has five possible degradation pathways in which the fractures of the S−N and N−C bonds are the two main chain scission degradation pathways confirmed through density functional theory (DFT) calculations. Furthermore, Cr(VI) was dominated by rapid reduction (0.0227 min −1 ) to low-toxicity Cr(III), which was eventually adsorbed by the dynamically transformed Fe 7 S 8 and secondary iron-oxide minerals. The SMX reaction path and degradation rate were increased by [Fe aqIV O] 2+ /[Fe aq V O] 3+ in the solution (reacting with SMX and accelerating the transformation of free radicals). Hence, the Fe 7 S 8 -PS micro/nanocatalytic system provides a new strategy for treating highconcentration SMX-Cr(VI) cocontaminated wastewater and groundwater.

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“…Te mudstone contained Fe and Al oxides with variable charges, and as the pH increased, the variable negative charge in the solution increased, causing the gravitational force on the Pb(II) increase and the electrostatic adsorption of Pb(II) increase. Te pH of the solution not only afects the magnitude of the electricity charge on the surface of the clay mineral material and the activity of the adsorption sites, but also the form of the metal ions present in the solution, thus afecting its adsorption properties [24]. Terefore, pH � 6 was determined to be the optimum pH value for Pb(II) adsorption on mudstone.…”

Section: Efect Of Solution Ph On the Adsorption Efectmentioning

confidence: 99%

Characterization Analysis of Mudstone and Study of Its Pb (II) Adsorption Characteristics in Polluted Water Bodies

Zhang,

Zhao,

Xia

et al. 2024

Journal of Chemistry

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In order to explore a medium material for the efficient treatment of Pb(II) pollutants in groundwater, in this paper, mudstone is selected as the medium material, and the morphological structure of the mudstone is characterizes via X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) analyses to study the feasibility of the mudstone adsorbing Pb(II) ions. Then, static adsorption experiments are carried out to investigate the removal effect of mudstone on Pb(II) in aqueous solutions under different conditions and to determine the optimal adsorption conditions. Finally, the results are fitted and analyzed using a thermodynamic model to explore the adsorption mechanism of the mudstone. The main results of this study are as follows. The main mineral composition of the mudstone used in the experiments includes CaCO3, SiO2, CaAl2O4·10H2O, and CaFe4O7. The specific surface area of the mudstone is as high as 23.027 m2·g−1, the pore size is 9.145 nm, and its surface structure is rough, with pores and fissures developed. The pore space and adsorption capacity of the mudstone were enhanced. When 1 g·L−1 of mudstone was added, the pH value of the solution was 6, the reaction time was 60 min, and the initial concentration of Pb(II) was 30 mg·L−1. The removal efficiency of Pb reached 84.5%, and the adsorption amount was 25.352 mg·g−1. For the removal of Pb(II) from the aqueous solution by the mudstone under different concentrations of Pb(II), the reaction was in accordance with the Langmuir adsorption isotherm model, and the maximum adsorption amount reached 54.975 mg·g−1. The relationship between the removal of Pb(II) and the reaction time was in accordance with the pseudo-second-order rate model. The results of this study suggest that mudstone can be used for the removal of Pb(II) from aqueous media.

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Solution pH affects single, sequential and binary systems of sulfamethoxazole and cadmium adsorption by self-assembled cellulose: Promotion or inhibition?

Cited by 39 publications

References 59 publications

Oxygen Vacancy-Dominated Activation of Chlorite and Oxidative Degradation of Sulfamethoxazole

Oxygen Vacancy-Dominated Activation of Chlorite and Oxidative Degradation of Sulfamethoxazole

Fe(IV)═O/Fe(V)═O and [Fe_aq^IVO]²⁺/[Fe_aq^VO]³⁺ Cooperating with Free Radicals Induced High-Rate Sulfamethoxazole-Cr(VI) Simultaneous Removal in a Fe₇S₈-Persulfate Micro/Nanocatalytic System

Characterization Analysis of Mudstone and Study of Its Pb (II) Adsorption Characteristics in Polluted Water Bodies

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Solution pH affects single, sequential and binary systems of sulfamethoxazole and cadmium adsorption by self-assembled cellulose: Promotion or inhibition?

Cited by 39 publications

References 59 publications

Oxygen Vacancy-Dominated Activation of Chlorite and Oxidative Degradation of Sulfamethoxazole

Oxygen Vacancy-Dominated Activation of Chlorite and Oxidative Degradation of Sulfamethoxazole

Fe(IV)═O/Fe(V)═O and [FeaqIVO]2+/[FeaqVO]3+ Cooperating with Free Radicals Induced High-Rate Sulfamethoxazole-Cr(VI) Simultaneous Removal in a Fe7S8-Persulfate Micro/Nanocatalytic System

Characterization Analysis of Mudstone and Study of Its Pb (II) Adsorption Characteristics in Polluted Water Bodies

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Fe(IV)═O/Fe(V)═O and [Fe_aq^IVO]²⁺/[Fe_aq^VO]³⁺ Cooperating with Free Radicals Induced High-Rate Sulfamethoxazole-Cr(VI) Simultaneous Removal in a Fe₇S₈-Persulfate Micro/Nanocatalytic System