Enhanced-oxidation of sulfanilamide in groundwater using combination of calcium peroxide and pyrite

Kim, Jong-Gook; Kim, Hye-Bin; Jeong, Won-Gune; Baek, Kitae

doi:10.1016/j.jhazmat.2021.126514

Cited by 39 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Calcium peroxide (CaO 2 ) based AOPs have promising potential in sewage treatment, natural water purification, disinfection, and soil remediation. − CaO 2 , as a solid source of H 2 O 2 , owns several advantages compared to H 2 O 2 . The solid nature makes the transport and storage of CaO 2 much easier and safer than that of H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

Zhang,

Song,

Zhan

et al. 2024

ACS EST Water

View full text Add to dashboard Cite

Unlike the case for inorganic phosphate (Pi), removing organic phosphorus (Po) is more challenging. Conventional methods for removing Po involve a two-step route, where Po is first converted to Pi by an advanced oxidation process, followed by subsequent chemical precipitation/coagulation. Here, we propose a one-step CaO2/UV method for simultaneous conversion and coprecipitation of phosphonates, a representative type of organic phosphorus compound. We discovered that the total P removal (82.0%) is much higher than the conversion efficiency of Po to Pi (26.7%) under a dose of 1.5 mM CaO2 and 4 h UV irradiation for nitrilotris-methylene phosphonic acid (NTMP) treatment, providing new directions for treating Po compounds without completely breaking down the molecular structure. We further found that a CaO2/Po molar ratio of 1.5 is ideal for inducing the partial breakdown of the NTMP structure, Ca-phosphate formation, and coprecipitation of NTMP and its degradation intermediates. Beyond that, we noted that the presence of Ca2+ enhances the reactivity of NTMP with hydroxyl radicals, as supported by the improved conversion efficiency of Po to Pi, i.e., 37.4% vs 9.1% under pH i 11. We also demonstrated the preliminary feasibility of the CaO2/UV system in treating the reverse osmosis concentrate. Our study offers a robust one-step approach and sheds new insights on the synergistic role of partial oxidation, complexation, and coprecipitation in dealing with phosphonate-laden wastewater.

show abstract

Section: Introductionmentioning

confidence: 99%

Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

Zhang,

Song,

Zhan

et al. 2024

ACS EST Water

View full text Add to dashboard Cite

show abstract

“…In recent years, calcium peroxide (CaO 2 )-based AOPs have been widely used in sewage treatment, − surface or groundwater purification, − and soil remediation as a safe, solid source of H 2 O 2 . ,, Indeed, the slow dissolving nature of CaO 2 allows a constant release of H 2 O 2 in a more extended period compared to the direct dose of H 2 O 2 , thus increasing the efficiency of pollutant degradation. , Previous studies have proved the capability of CaO 2 -based processes in treating different types of contaminants. For example, Chen et al developed a CaO 2 -enhanced Fenton-like system and demonstrated its high efficiency in removing arsenite .…”

Section: Introductionmentioning

confidence: 99%

CaO₂/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation

et al. 2023

View full text Add to dashboard Cite

Hypophosphite (P(I)) is ubiquitous in some waste streams. It may contribute to the eutrophication of water bodies, yet conventional methods are ineffective in treating P(I)-laden wastewater. Here, we propose a novel CaO2/ultraviolet (UV) system that can simultaneously remove P(I) and recover Ca-phosphate. This system lies in the simultaneous release of OH–, Ca2+, and H2O2, with the last being activated and producing reactive oxygen species (ROS) under UV irradiation. Subsequently, the generated ROS converts P(I) to phosphite and phosphate, forming Ca-phosphate with the released Ca2+ at pH 11.0. Beyond activating H2O2, UV light also promotes the dissolution of CaO2 powders. The system removes 97.0% of 1.0 mM P(I) in 6 h with dosing 2.0 mM CaO2. The presence of 5.0 mM HCO3 – drops P(I) removal from 97.0 to 14.1% by competing with P(V) toward Ca2+. Nitrate and humic acid show similar effects by adsorbing UV light or quenching ROS. However, we may overcome the adverse effects with an enhanced CaO2 dose. For example, with 10 mM CaO2, the CaO2/UV system removed more than 78% of non-ortho P from actual electroless rinse water. These results confirmed that CaO2/UV is an exciting all-in-one system for treating P(I)-laden wastewater and recovering valuable P products.

show abstract

“…Many techniques have been developed for the degradation of organic dyes, − but most of them have some problems. For example, photocatalysis − and electrocatalysis , require high energy consumption, and the use of biodegradation and ion exchange faces problems such as high cost. , Many iron-based substances exist in nature, which provides great convenience to the Fenton reaction . Still, the acidic pH environment required for the Fenton reaction and the iron sludge produced limit its further application. − Recent years have seen the rapid development of the newly emerging nanozymes, and studies on the application of nanozymes to the degradation of organic dyes have also emerged. , …”

Section: Introductionmentioning

confidence: 99%

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Feng

Wang

Xue

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Compared with natural enzymes, nanozymes have advantages such as high stability, low cost, and a broad application prospect. However, due to the low catalytic activity of conventional nanozymes, synthesizing nanozymes with excellent enzyme-like activity will be long-term work. Herein, we synthesized single-atom nanozymes centered on Mn with N, P, and S doped (Mn-SAzyme) with enhanced peroxidase-like (POD-like) activity. We found that the presence of the Mn metal center significantly increased the POD-like activity of the nanozyme, exhibiting catalytic properties consistent with Michaelis–Menten kinetics. The POD-like activity was measured to be 17.48 U/mg, which was higher than that of the sample without the metal center. Using methylene blue (MB) as the organic dye model, the degradation efficiency of Mn-SAzyme could reach 90.1% within 300 min at pH 6.5, within the H2O2 concentration of 0.1 M and 25 mg/L of nanozyme dosage. Free radical quenching experiments and electron paramagnetic resonance tests showed that •O2 – and •OH were the key to degrading organic dyes. This work aims to explore more methods for synthesizing highly active nanozymes and successfully applying the synthesized nanozymes to the degradation of organic dyes.

show abstract

Enhanced-oxidation of sulfanilamide in groundwater using combination of calcium peroxide and pyrite

Cited by 39 publications

References 42 publications

Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

CaO₂/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Contact Info

Product

Resources

About

Enhanced-oxidation of sulfanilamide in groundwater using combination of calcium peroxide and pyrite

Cited by 39 publications

References 42 publications

Efficient Treatment of Phosphonate-Laden Wastewater by CaO2/UV: Partial Oxidation, Complexation, and Coprecipitation

Efficient Treatment of Phosphonate-Laden Wastewater by CaO2/UV: Partial Oxidation, Complexation, and Coprecipitation

CaO2/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Contact Info

Product

Resources

About

Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

CaO₂/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation