Far-UVC Photolysis of Peroxydisulfate for Micropollutant Degradation in Water

Environmental Science & Technology, Год журнала: 2024, Номер 58(13), С. 6030 - 6038

Опубликована: Март 22, 2024

Increasing radical yields to reduce UV fluence requirement for achieving targeted removal of micropollutants in water would make UV-based advanced oxidation processes (AOPs) less energy demanding the context United Nations' Sustainable Development Goals and carbon neutrality. We herein demonstrate that, by switching radiation source from conventional low-pressure at 254 nm (UV254) emerging Far-UVC 222 (UV222), fluence-based concentration HO• UV/peroxydisulfate (UV/PDS) AOP increases 6.40, 2.89, 6.00 times deionized water, tap surface respectively, with SO4•– also 5.06, 5.81, 55.47 times, respectively. The enhancement generation is confirmed using a kinetic model. pseudo-first-order degradation rate constants 16 UV222/PDS are predicted be 1.94–13.71 higher than those UV254/PDS AOP. Among tested matrix components, chloride nitrate decrease but increase Compared AOP, decreases formation potentials carbonaceous disinfection byproducts (DBPs) nitrogenous DBPs.

Язык: Английский

---

Bimetallic CoMoO₄ Nanozymes Enhanced Luminol Chemiluminescence for the Detection of Dopamine

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(3), С. 2983 - 2991

Опубликована: Янв. 22, 2024

Transition-metal-based nanozymes show great potential for chemiluminescence (CL) detection due to their stability, excellent catalytic properties, good biocompatibility, and facile synthesis. In this study, bimetallic CoMoO4 nanorods with high peroxidase activity were synthesized using a hydrothermal method, followed by calcination treatment. The as-synthesized utilized as catalysts CL the first time. They enhance intensity of luminol/hydrogen peroxide system nearly 750-fold. Furthermore, sensitive rapid platform dopamine was established based on quenching effect signal system. proposed method exhibited linear range 10–500 nM limit 1.98 nM. Moreover, in serum samples successfully measured standard addition showing satisfactory recovery 97.2–104.3%. This work provides robust support development efficient platforms detection.

Язык: Английский

---

What is the role of nitrate/nitrite in trace organic contaminants degradation and transformation during UV-based advanced oxidation processes?

Water Research, Год журнала: 2024, Номер 253, С. 121259 - 121259

Опубликована: Фев. 5, 2024

Язык: Английский

---

Unveiling the Role of Fractionated Graphene Oxide in Nitric Oxide Scavenging

Molecules, Год журнала: 2025, Номер 30(5), С. 1069 - 1069

Опубликована: Фев. 26, 2025

The feasibility of saturating aqueous anoxic solutions with in situ-generated high-purity nitric oxide (NO) is shown herein. A methemoglobin assay estimated the average concentration to be ca. 20 ± 3 µM. Graphene dispersions were prepared by ultrasound-assisted extra exfoliation. These dispersions, including unpurified (pristine) samples and purified from transition metal impurities (bulk) fractions (bulkGO) (nano) separated (nanoGO) a range 0.5 14 kDa ppm level concentrations. robust reproducible chemiluminescence (CL) validated interaction between graphene NO luminol-based system. results showed significant increase scavenging activity within bulkGO nanofractions ranging 3.5 kDa. different reaction pathways underlying transformation are being evaluated, focusing on understanding how its presence or absence affects these processes. Our kinetic model suggests difference regulation; nanoGO demonstrates an interception rate seventy-times higher than that achieved through CL quenching.

Язык: Английский

---

Copper Nanoparticles Confined in a Silica Nanochannel Film for the Electrochemical Detection of Nitrate Ions in Water Samples

Molecules, Год журнала: 2023, Номер 28(22), С. 7515 - 7515

Опубликована: Ноя. 10, 2023

The nitrate ion (NO3-) is a typical pollutant in environmental samples, posing threat to the aquatic ecosystem and human health. Therefore, rapid accurate detection of NO3- crucial for both sciences government regulations. Here we report fabrication an amino-functionalized, vertically ordered mesoporous silica film (NH2-VMSF) confining localized copper nanoparticles (CuNPs) electrochemical NO3-. NH2-VMSF-carrying amino groups possess perpendicular nanochannel structure ultrasmall nanopores, enabling confined growth CuNPs through electrodeposition method. resulting CuNPs/NH2-VMSF-modified indium tin oxide (ITO) electrode (CuNPs/NH2-VMSF/ITO) combines electrocatalytic reduction ability electrostatic attraction capacity NH2-VMSF towards Thus, it sensitive method determination with wide linear range 5.0-1000 μM low limit 2.3 μM. Direct water samples (tap water, lake seawater, rainwater) acceptable recoveries ranging from 97.8% 109% was performed, demonstrating that proposed CuNPs/NH2-VMSF/ITO sensor has excellent reproducibility, regeneration, anti-interference abilities.

Язык: Английский

---

Advancements in fluorescent probes for nitrite sensing: A review

Journal of Molecular Structure, Год журнала: 2023, Номер 1296, С. 136926 - 136926

Опубликована: Окт. 23, 2023

Язык: Английский

---

Simultaneous separation and detection of monochloramine, nitrite, and nitrate by step-gradient mixed-mode ion chromatography: Translation from benchtop to portable ion chromatograph

Analytica Chimica Acta, Год журнала: 2024, Номер 1304, С. 342557 - 342557

Опубликована: Март 28, 2024

Nitrite (NO2−) and nitrate (NO3−) can be produced in the distribution systems of chloraminated drinking water due to nitrification ammonia. The most applied inorganic chloramine for this purpose, namely monochloramine (NH2Cl), is also released into aquatic environments from treatment plants' effluent within industrial waste streams. Within process, continuous monitoring disinfectant levels necessary limit harmful by-product (DBP) formation. Currently, NH2Cl interfere with nutrient analysis samples, there are no analytical techniques available simultaneous NH2Cl, NO2−, NO3−. A green method based on mixed-mode ion chromatography, specifically exchange exclusion modes, was developed separation detection achieved using a Dionex IonPac AG15 column guard step gradient elution involving deionized 120.0 mM NaCl. benchtop HPLC custom-made multi-wavelength UV absorbance detector 50-mm flow cell enable sensitive NO3− at 240 nm, 220 215 respectively. then transferred portable chromatography (IC) system, Aquamonitrix analyser. total run time less than 10 min both systems. had (LOD) 0.07 μg mL−1 as Cl2 0.01 0.03 LODs obtained analyser were found 0.36 Cl2, 0.02 mL−1, 0.11 NO3−, Excellent linearity (r > 0.9999) over studied concentration ranges. system spiked municipal samples showed excellent repeatability three analytes different (RSD triplicate recovery experiments <1.9 %). Moreover, variation retention negligible target RSD <0.8 % 12 runs. We reporting first chromatographic samples. critical determination dosing, quality, status. or via automated IC monitor compounds plants.

Язык: Английский

---

Selective and Accurate Detection of Nitrate in Aquaculture Water with Surface-Enhanced Raman Scattering (SERS) Using Gold Nanoparticles Decorated with β-Cyclodextrins

Sensors, Год журнала: 2024, Номер 24(4), С. 1093 - 1093

Опубликована: Фев. 7, 2024

A surface-enhanced Raman scattering (SERS) method for measuring nitrate nitrogen in aquaculture water was developed using a substrate of β-cyclodextrin-modified gold nanoparticles (SH-β-CD@AuNPs). Addressing the issues low sensitivity, narrow linear range, and relatively poor selectivity single metal SERS detection nitrogen, we combined with cyclodextrin supramolecular compounds to prepare AuNPs enveloped by cyclodextrin, which exhibits ultra-high activity. Subsequently, vanadium(III) chloride used convert ions into nitrite ions. The adsorption mechanism between reaction product benzotriazole (BTAH) o-phenylenediamine (OPD) on SH-β-CD@AuNPs studied through SERS, achieving simultaneous nitrogen. experimental results show that BTAH distinct characteristic peaks at 1168, 1240, 1375, 1600 cm

Язык: Английский

---

Rapid detection of nitrite in food by multi-colorimetric and fluorescence dual-mode based on crystal violet modulated carbon dots

Microchemical Journal, Год журнала: 2024, Номер 200, С. 110334 - 110334

Опубликована: Март 15, 2024

Язык: Английский

---

Integration of Ultrathin Bubble Walls and Electrochemistry: Innovation in Microsensing for Forensic Nitrite Detection and Microscale Metallic Film Deposition

Analytical Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Фев. 7, 2024

We present a strategy for electrochemical measurements using durable minute bubble wall with thickness of 27 μm (D = 1.8 cm) as an innovative medium. The composition, thickness, and volume the tiny film were investigated estimated spectroscopic method Beer–Lambert law. A carbon microelectrode 10 μm) was then employed working electrode, inserted through to function solution interface. First, potential this microelectrodeposition metallic Ag Pd films in investigated. Interestingly, microscopic images deposited clearly demonstrated that determines confines deposition zone. In other words, template-free achieved. second phase our work, microelectroanalysis trace levels nitrite ions performed within on foam-covered hand, between fingers directly, low limit detection 28 μM. This technique holds significance criminal investigations, presence NO2– hand indicates gunshot residue aids identifying suspects. comparison current methods, approach is rapid, simple, cost-effective, amenable on-site applications, eliminating need sample treatment. Ultimately, utilization novel microreactor can open new ways microelectrochemical analysis, presenting opportunities applications field sensors.

Язык: Английский

---