pH-Dependent mechanisms and kinetics of the removal of acetaminophen by manganese dioxide

Hu, Ching-Yao; Kuan, Wen-Hui; Lee, I-Ju; Liu, Yu-Jung

doi:10.1016/j.jece.2021.105129

Cited by 9 publications

(4 citation statements)

References 46 publications

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Section: Resultsmentioning

confidence: 99%

“…MnO 2 with abundant surface hydroxyl groups still had the most hydroxyl groups and did not participate in the reaction; this was mainly because the hydroxyl complexation changed the pH of the solution, so that the reaction could not continue. Therefore, repeatedly adjusting and controlling pH was expected to improve the adsorption performance of MnO 2 . In this paper, the adsorption of heavy metals Co 2+ and Ni 2+ in high-concentration MnSO 4 solution was attempted by using the characteristic of MnO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, repeatedly adjusting and controlling pH was expected to improve the adsorption performance of MnO 2 . 33 In this paper, the adsorption of heavy metals Co 2+ and Ni 2+ in highconcentration MnSO 4 solution was attempted by using the characteristic of MnO 2 . It can be seen from Figure 13a that two kinds of δ-MnO 2 with rich surface hydroxyl groups had high adsorption capacity, especially δ 2 -MnO 2 for Co 2+ and Ni 2+ with adsorption rate reaching 96.55% and 79.73%, respectively.…”

Section: Effect Of Reactionmentioning

confidence: 99%

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Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO₂ and Its Adsorption for Co²⁺ and Ni²⁺

Wang

Gou

et al. 2022

ACS Omega

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MnO 2 has shown great potential in the field of adsorption and has a good adsorption effect on heavy metal ions in aqueous solution, but there have been problems in the adsorption of heavy metal ions in high-concentration metal salt solutions. In this paper, different crystal forms of MnO 2 (α-MnO 2 , β-MnO 2 , γ-MnO 2 , δ 1 -MnO 2 , δ 2 -MnO 2 , and ε-MnO 2 ) were prepared and characterized by XRD, SEM, EDS, XPS, ZETA, and FT-IR. The reasons for the equi-acidity point pH change of MnO 2 and the complex mechanism of surface hydroxylation on metal ions were discussed. The results showed that the equi-acidity point pHs of different crystalline MnO 2 were different. The equi-acidity point pH decreased with the increase of reaction temperature and electrolyte concentration, but the reaction time had no effect on it. The equi-acidity point pHs of MnO 2 were essentially equal to the equilibrium pH values of adsorption and desorption between surface hydroxyl and metal ions on them. The change of equi-acidity points was mainly due to the complexation of surface hydroxyl, and the equi-acidity point pHs depended on the content of surface hydroxyl and the size of the complexation ability. According to the equi-acidity point pH characteristics of MnO 2 , more hydroxyl groups could participate in the complexation reaction by repeatedly controlling the pH, so that MnO 2 could adsorb heavy metals Co 2+ and Ni 2+ in high-concentration MnSO 4 solution, and the adsorption rates of Co 2+ and Ni 2+ could reach 96.55 and 79.73%, respectively. The effects of MnO 2 dosage and Mn 2+ concentration on the adsorption performance were further investigated, and the products after MnO 2 adsorption were analyzed by EDS and FT-IR. A new process for MnO 2 to adsorb heavy metals Co 2+ and Ni 2+ in high-concentration MnSO 4 solution was explored, which provided a reference for the deep purification of manganese sulfate solutions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Reactionmentioning

confidence: 99%

See 1 more Smart Citation

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO₂ and Its Adsorption for Co²⁺ and Ni²⁺

Wang

Gou

et al. 2022

ACS Omega

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“…Advanced oxidation process is a chemical reaction based on activation of specific molecules like hydrogen peroxide, and PS leads to generate high active molecules with high oxidation potential called radicals. [15,17] These radicals are capable to degrading high recalcitrance compounds and converting them into smaller by-products with less toxic effects than the parent pollutant. Many activation methods have been used in the advanced oxidation process to degrade ACT like ultrasound, visible and ultraviolet light, semiconductors and metals particles, nonthermal-plasma activation, and electro-activation.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Activation of Persulfate by Activated Carbon for Efficient Acetaminophen Degradation: Mechanism, Kinetics, Mineralization, and Density Functional Theory

2022

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Pharmaceutical compounds attracted environmentalists according to their unknown impact on the ecosystem and the increase in their demand. Acetaminophen (ACT) or paracetamol has been detected more than the natural concentration value. To avoid the negative impact of the ACT accumulation into the environment, many treatment techniques have been applied. Among them, advanced oxidation process (AOP) techniques have shown high efficiency to remove ACT. In this study, the ability of AC to catalyze PS by its functional group was evaluated, and the degradation efficiency of ACT was determined by using an activated carbon (AC)/persulfate (PS) system. In addition, the mechanism, kinetics, mineralization, and the density functional theory were also investigated. HPLC was used to measure ACT concentration, and the optimum results in this work were 100 % degradation within 3 minutes at catalysts concentrations AC 8.25 mM/PS 1.65 mM at pH 7 and the mineralization were 24 % after 90 min of reaction. And the degradation pathway of ACT was built based on density functional theory. This study will contribute to clarifying the role of carbon catalysts in the PS oxidation of pollutants. The degradation of ACT by using an AC/PS system is recommended because of the high degradations efficiency, non-toxic byproducts, and environmentally friendly.

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PMS activation by natural pyrite for APAP degradation: Underlying mechanism and long-term removal of APAP

Wang

Dong

2023

Catalysis Communications

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pH-Dependent mechanisms and kinetics of the removal of acetaminophen by manganese dioxide

Cited by 9 publications

References 46 publications

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO₂ and Its Adsorption for Co²⁺ and Ni²⁺

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO₂ and Its Adsorption for Co²⁺ and Ni²⁺

Heterogeneous Activation of Persulfate by Activated Carbon for Efficient Acetaminophen Degradation: Mechanism, Kinetics, Mineralization, and Density Functional Theory

PMS activation by natural pyrite for APAP degradation: Underlying mechanism and long-term removal of APAP

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pH-Dependent mechanisms and kinetics of the removal of acetaminophen by manganese dioxide

Cited by 9 publications

References 46 publications

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO2 and Its Adsorption for Co2+ and Ni2+

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO2 and Its Adsorption for Co2+ and Ni2+

Heterogeneous Activation of Persulfate by Activated Carbon for Efficient Acetaminophen Degradation: Mechanism, Kinetics, Mineralization, and Density Functional Theory

PMS activation by natural pyrite for APAP degradation: Underlying mechanism and long-term removal of APAP

Contact Info

Product

Resources

About

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO₂ and Its Adsorption for Co²⁺ and Ni²⁺

Relationship between Surface Hydroxyl Complexation and Equi-Acidity Point pH of MnO₂ and Its Adsorption for Co²⁺ and Ni²⁺