UV/Sodium percarbonate for bisphenol A treatment in water: Impact of water quality parameters on the formation of reactive radicals

Gao, Jiong; Nunes, Roberta Frinhani; Ο'Shea, Kevin Ε.; Saylor, Greg L.; Bu, Lingjun; Kang, Yu-Gyeong; Duan, Xiaodi; Dionysiou, Dionysios D.; Luo, Shenglian

doi:10.1016/j.watres.2022.118457

Cited by 38 publications

(22 citation statements)

References 26 publications

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“…Considering the short lifetime of 1 O 2 in H 2 O (2 μs), the TEMP-trapping experiment was further conducted in deuterium oxide (D 2 O) to markedly extend the lifetime of 1 O 2 (20–32 μs). , As shown in Figure c, the alternative use of D 2 O led to the formation of an enhanced signal of TEMP– 1 O 2 adducts compared to ultrapure water, confirming the generation of 1 O 2 at neutral and alkaline pHs. Since the SPC-based AOPs enabled the generation of the carbonate radical (CO 3 •– ) due to the interaction of • OH with HCO 3 – /CO 3 2– (eqs and ), , the contribution of CO 3 •– in the CuO/SPC/AA process was further testified. The DMPO–CO 3 •– adduct signals with a weak intensity appeared at pH 7.0 and 9.0, while no visible signal was observed at pH = 3.0 (Figure d), suggesting the generation of CO 3 •– at neutral and alkaline pHs.…”

Section: Resultsmentioning

confidence: 99%

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Ascorbic Acid-Enhanced CuO/Percarbonate Oxidation: Insights Into the pH-Dependent Mechanism

Dong

Xiao

et al. 2023

ACS EST Eng.

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Herein, the decontamination performance and likelihood of a shift in the reaction mechanism of CuO-activated percarbonate (SPC) in the presence of ascorbic acid (AA) (i.e., CuO/SPC/AA process) under varying pH conditions were explored. Experimental results revealed that sulfamethazine (SMT) could be well degraded over a wide pH range (3.0–9.0). Mechanistic investigations suggested that the hydroxyl radical (•OH) was the major reactive oxygen species (ROS) at acidic pH, whereas Cu(III) played a dominant role in SMT degradation at neutral and alkaline pHs. Alternatively, •OH was determined to be the secondary reactive species generated from the hydrolysis of Cu(III) at neutral and alkaline pHs. Moreover, the role of AA and coexisting Na2CO3 was explored. It was concluded that the regeneration of Cu(I) played an important role in mediating the copper redox cycle under all of the studied pHs, which mainly benefited from reductive AA, and the available superoxide radical (O2 •–) and deprotonated form of H2O2 could also contribute to this process at neutral and alkaline pHs. The coexisting Na2CO3 exerted a negligible impact on SMT degradation at acidic and neutral pHs, while a slight inhibitive effect was observed at alkaline pH. Simultaneously, the potential practicability of the CuO/SPC/AA process was evaluated. This work deepens the understanding of copper-catalyzed heterogeneous activation of percarbonate, widening the application of the reductant for water decontamination.

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Section: Resultsmentioning

confidence: 99%

“…) due to the interaction of • OH with HCO 3 − / CO 3 2− (eqs 3 and 4), 4,31 the contribution of CO 3…”

Section: •−mentioning

confidence: 99%

Ascorbic Acid-Enhanced CuO/Percarbonate Oxidation: Insights Into the pH-Dependent Mechanism

Dong

Xiao

et al. 2023

ACS EST Eng.

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“…Soluble oxidants which were reported to have potential to oxidize tyrosine were applied. − However, to our disappointment, no notable change of the activity occurred between them. Thus, Cu(II) as a cofactor without auxiliaries was chosen as the best reaction condition.…”

Section: Resultsmentioning

confidence: 94%

Protein C-Terminal Tyrosine Conjugation via Recyclable Immobilized BmTYR

Zhu

et al. 2022

ACS Omega

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Protein modification plays an essential role in biological and pharmaceutical research. Due to the ordinary selectivity and inevitable damage to proteins of chemical synthetic methods, increased efforts were focused on biocatalysts which exhibited high regioselectivity and mild reaction conditions. However, separation of the biocatalysts and modified proteins remained a problem, especially when scaling up. Here, we developed a simple method for site-specific protein modification with a recyclable biocatalyst. The immobilizing tyrosinase (BmTYR) on magnetic beads can oxidize C-terminal tyrosine residues of the target protein to o-quinone, followed by the spontaneous addition of different nucleophiles (e.g., aniline derivatives), resulting in a C-terminal modified protein. Compared to the homogeneous biocatalytic system reported before, this heterogeneous system leads to an easier separation. Furthermore, the solid-phase biocatalyst can be regenerated during separation, providing reusability and lower costs.

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“…Besides, the perborate has been employed as the oxidant in the homogeneous photo-Fenton and heterogeneous Fenton-like reactions for dye and phenol degradation [12,16], respectively. Among them, the UV activation method is easy operation and safe without secondary pollution, so it could efficaciously excite H2O2 to decompose organics from wastewater [17,18].…”

Section: Introductionmentioning

confidence: 99%

Humic Acid Removal in Water via UV Activated Sodium Perborate Process

et al. 2022

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Humic acid (HA) has complex molecular structure and is capable of adsorption, ion exchange, and chelation with organic and inorganic pollutants in water bodies, worsening water quality and jeopardizing human health and ecological environment. How to effectively remove HA from water is one of the research focuses of this paper. In this study, the UV-activated sodium perborate (SPB) synergistic system (UV/SPB) was established to eliminate HA in water. The effects of initial HA concentration, SPB dose, and initial pH value on the HA elimination were determined, and the main mechanisms of the synergy and HA degradation were explored. The outcomes show that the HA elimination ratio by the sole UV and only SPB system were only 0.5% and 1.5%, respectively. The HA removal of UV/SPB reached 88.8%, which can remove HA more effectively than other systems. Free radical masking experiment proved that hydroxyl radical produced by SPB activation is the main active substance for HA removal. The results of UV-vis absorption spectrum, absorbance ratio, specific UV absorbance, and excitation–emission matrix spectroscopy verified that the UV/SPB system can effectively decompose and mineralize HA.

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UV/Sodium percarbonate for bisphenol A treatment in water: Impact of water quality parameters on the formation of reactive radicals

Cited by 38 publications

References 26 publications

Ascorbic Acid-Enhanced CuO/Percarbonate Oxidation: Insights Into the pH-Dependent Mechanism

Ascorbic Acid-Enhanced CuO/Percarbonate Oxidation: Insights Into the pH-Dependent Mechanism

Protein C-Terminal Tyrosine Conjugation via Recyclable Immobilized BmTYR

Humic Acid Removal in Water via UV Activated Sodium Perborate Process

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