An enhanced Bi/nZVI activated molecular oxygen process for the degradation of sulfonamide antibiotics in a citrate buffering system.

Citric acid (CA) and sodium citrate (NaCA) have been effectively employed to synergize with bismuth-doped nanoscale zero-valent iron (Bi/nZVI) to degrade sulfonamide antibiotics (SAs) without the need for additional HO. In the integrated Bi/nZVI-CA/NaCA system, excellent oxidation activity of sulfamethazine (SM2), sulfadiazine (SD) and sulfamethoxazole (SMX) in the mixed solution was obtained. The bimetallic enhancement alongside ligand complexation significantly promoted Bi/nZVI to catalyze molecular oxygen and was conducive to the spontaneous generation of HO.

Low-toxicity natural pyrite on electro-Fenton catalytic reaction in a wide pH range.

The resource utilization of natural pyrite not only reduces secondary pollution but also brings certain environmental benefits. However, the green and efficient use of pyrite presents certain challenges. In this study, a novel electro-Fenton (EF) system was constructed utilizing copper modified graphite felt (GF/Cu) as cathode and natural pyrite (com-FeS) as catalyst.

Reduced sulfur accelerates Fe(III)/Fe(II) recycling in FeS surface for enhanced electro-Fenton reaction.

FeS is well-known for its role in redox reactions. However, the mechanism within heterogeneous electron-Fenton (Hetero-EF) systems remains unclear. In this study, a novel FeS based three-dimensional system (GF/Cu-FeS) with self-generation of HO was investigated for Hetero-EF degradation of sulfamethazine (SMZ).

Core-shell structured lignin-stabilized silver nanoprisms for colorimetric detection of sulfur ions.

Widespread occurrence of sulfides in domestic and industrial wastewater contributes to environmental pollution and poses risks to human health. Therefore, the development of highly selective, sensitive, and rapid sulfur ion (S) detection probes in aquatic ecosystems is of paramount importance. In this study, lignin-stabilized silver nanoprisms (EHL@AgNPRs) were prepared using the seed growth and self-assembly methods.

Bi/mZVI Combined with Citric Acid and Sodium Citrate to Mineralize Multiple Sulfa Antibiotics: Performance and Mechanism.

The oxidative mineralization of sulfanilamide drugs (SAs) using micro-size zero-valent iron (mZVI) cooperated with a citric acid buffer solution was evaluated. In this study SM2, SMX, and SD could be removed at 66%, 89%, and 83%, respectively, in a 0.5% Bi/mZVI+CA+NaCA system within 2 h.

Association between the rs3733846 in the flanking region of miR-143/145 and risk of cervical squamous cell carcinoma.

To investigate the effect of rs3733846 in the flanking region of miR-143/145 on susceptibility to cervical squamous cell carcinoma (CSCC). We collected venous blood samples from 242 CSCC patients and 250 healthy controls. The rs3733846 polymorphism was genotyped by SnaPshot and Sanger sequencing.

Citrate iron complex induced dramatically enhanced oxidation of atrazine with bimetallic Bi/Fe: Reactivity, oxidation and mechanism.

The oxidative degradation of atrazine (ATR) using bimetallic Bi/Fe nanoparticles cooperated with citric acid (CA) and sodium citrate (NaCA) without extra addition of HO or another oxidant was conducted. Almost 73% of ATR was removed in Bi/Fe+NaCA + CA buffer system in 3 h, and the bimetallic Bi/Fe performs high stability and long service life in the buffer system according to the results of cyclic degradation experiments. The citrate iron complex of Fe(II)[Cit] played the key role for the degradation process since it could quickly react with the generated HO to produce free radicals in the Bi/Fe+NaCA + CA system, which broadened the applicable pH range of the traditional Fenton reaction and promoted the oxidative degradation process of ATR.

Photocatalytic production of dihydroxyacetone from glycerol on TiO in acetonitrile.

In this paper, photocatalytic production of dihydroxyacetone (DHA) from glycerol in acetonitrile on TiO was investigated. HPLC-MS analysis showed that glycerol was converted to DHA, glyceraldehyde (GAD), glyceric acid and several other chemicals. Using acetonitrile as the reaction medium instead of water not only provided a more selective process for production of DHA but also increased the glycerol conversion.

Synergistic utilization of inherent halides and alcohols in hydraulic fracturing wastewater for radical-based treatment: A case study of di-(2-ethylhexyl) phthalate removal.

The degradation of di-(2-ethylhexyl) phthalate (DEHP) was examined as an example to capitalize on the potential interactions of peroxydisulfate (PS) and ferrous iron (Fe) in the model Day-1/Day-90 and on-site hydraulic fracturing wastewater (FWW). The primary oxidative radicals in the Fe/PS system (i.e.

Oxygen vacancies enhanced photocatalytic activity towards VOCs oxidation over Pt deposited BiWO under visible light.

A novel Pt assisted self-modified BiWO composites (Pt/Bi-BWO) with high oxygen vacancies concentration was successfully fabricated via a simple in-situ NaBH reduction method in presence of HPtCl•6HO. The Pt/Bi-BWO performed excellent photocatalytic activity on the degradation of gaseous toluene under visible light illumination. The photocatalytic reaction rate of 0.

Sunflower stalk-derived biochar enhanced thermal activation of persulfate for high efficient oxidation of p-nitrophenol.

Sunflower stalk-derived biochars (BC) were prepared at various temperatures (i.e., 500, 650, and 1000 °C) and demonstrated as a highly efficient catalyst in persulfate (PS) activation for the oxidation of p-nitrophenol (PNP) at 60 °C.

Novel visible light enhanced Pyrite-Fenton system toward ultrarapid oxidation of p-nitrophenol: Catalytic activity, characterization and mechanism.

The activities of heterogeneous Fenton and Photo-Fenton processes using pyrite (FeS) prepared via a solvethermal method were evaluated by oxidation of p-nitrophenol (PNP). PNP could be completely ultrarapidly oxidized by Pyrite-Photo-Fenton (Pyrite-PF) system within 4 min, versus 10 min in Pyrite-Fenton (Pyrite-F) system. The excellent oxidation performance obtained by Pyrite-PF might be due to accelerated circulation between ferrous ions and ferric ions under visible light illumination, which improved generation of reactive oxygen species (ROS).

Photosensitized diastereoisomer-specific degradation of hexabromocyclododecane (HBCD) in the presence of humic acid in aquatic systems.

Humic acids (HA) are the most important photosensitizers in the ocean and generate highly reactive oxygen species (ROS), known as photochemically produce reactive intermediates (PPRI), which degrade organic pollutants. Thus, to reveal the fate of organic pollutants in an aqueous environment, it is important to understand the natural photodegradation phenomenon caused by HA. Three ROS generated from HA, O, O-, and OH, were measured using different probe compounds and instrumental techniques.

Self-Generation of Reactive Oxygen Species on Crystalline AgBiO for the Oxidative Remediation of Organic Pollutants.

In this study, we synthesized a novel perovskite nanomaterial consisting of AgBiO nanoparticles (NPs) via an ion-exchange method for remediation of polluted environments. The AgBiO NPs could self-produce significant amounts of reactive oxygen species (ROS) without light illumination or any other additional oxidant due to the controllable release of lattice oxygen from the crystalline AgBiO, resulting in the formation of ROS somehow. The self-produced O, O, and OH were confirmed by electron spin resonance spectroscopy using a spin trap technique.

Molybdenum-Tungsten Mixed Oxide Deposited into Titanium Dioxide Nanotube Arrays for Ultrahigh Rate Supercapacitors.

A novel method involving the fabrication of Mo-W mixed oxide (MoWO) is proposed to modify the modest reaction kinetics and poor cycling stability of MoO material. By a simple coelectrodeposition method, a series of MoWO oxides is deposited on a TiO nanotube array substrate. Because of the differences between Mo and W in nature, there is significant distortion existing in the mixed oxides, leading to their decreased crystallite size and enlarged lattice space, which facilitates ion diffusion in the solid.

Enhancing the reactivity of bimetallic Bi/Fe(0) by citric acid for remediation of polluted water.

In this study, the environmentally benign citric acid (CA) was utilized to improve the aerobic degradation of 4-chlorophenol (4-CP) over bismuth modified nanoscale zero-valent iron (Bi/Fe(0)). The characterization results revealed the existence of bismuth covering on the Fe(0) surface under zero-valent state. And, the Bi/Fe(0)-CA+O2 system performed excellent reactivity in degradation of 4-CP due to the generation of reactive oxygen species (ROS), which was confirmed by electron spin resonance (ESR) spectroscopy.

Novel self-assembled bimetallic structure of Bi/Fe(0): the oxidative and reductive degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX).

A novel self-assembled bimetallic zero-valent bismuth/iron (Bi/Fe(0)) composite was synthesized, characterized, and used successfully to remove hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) from wastewater. To assess the oxidative and reductive reactivities of Bi/Fe(0) nanoparticles (NPs), RDX degradation experiments were conducted in either ambient or anaerobic conditions, respectively. The best RDX degradation was achieved using 4%-Bi/Fe(0) (atomic ratio) NPs.

Fabrication of novel oxygen-releasing alginate beads as an efficient oxygen carrier for the enhancement of aerobic bioremediation of 1,4-dioxane contaminated groundwater.

Oxygen-releasing alginate beads (ORABs), a new concept of oxygen-releasing compounds (ORCs) designed to overcome some limitations regarding the fast oxygen release rate and the high pH equilibrium of ORCs, were fabricated to promote the stimulation of aerobic biodegradation in anaerobic groundwater. Slow oxygen-releasing rate and maintenance of constant pH were achieved by changing the parameters (ionic radius and valence) related to the cross-linking ions composing ORABs, and the best results were obtained for ORABs cross-linked with Al (Al-ORABs). Furthermore, the mechanism of the improved aerobic biodegradation using Al-ORABs under oxygen-limiting groundwater conditions was elucidated in batch and column studies with 1,4-dioxane and Mycrobacterium sp.

A novel self-assembling nanoparticle of Ag-Bi with high reactive efficiency.

A novel Ag-Bi nanoparticle has been prepared via a facile precipitation approach. The nanoparticle could achieve purification of contaminated water without supplements and exhibited much higher activity compared to other popular nanoparticles (e.g.

Carboxymethyl cellulose coating decreases toxicity and oxidizing capacity of nanoscale zerovalent iron.

Nanoscale zerovalent iron (NZVI) with modified surface via coating with organic stabilizers has been documented with enhanced colloidal stability and dispersity. Therefore, the expanded application potential and accompanying intrinsic exposure of such nanoparticle can be anticipated. In our study, carboxymethyl cellulose (CMC)-stabilized NZVI (CNZVI) exerted minimized oxidative stress response and slower disruption of cell membrane integrity, resulting in mitigated cytotoxicity towards bacteria Agrobacterium sp.

Simulation of the performance of aerobic granular sludge SBR using modified ASM3 model.

The activated sludge model No. 3 (ASM3) was modified to describe the biological reactions in aerobic granular sludge SBR. The simultaneous storage and growth, nitrification and denitrification were all accounted for in modified model.

[Research of aerobic granule characteristics with different granule age].

In the SBR reactor, we studied the different style, physicochemical characteristic, pollutants removal and microbial activity between the short age and long age aerobic granule, respectively. The short age aerobic granule was cultivated from activated floccules sludge and the other was gotten from aerobic granular sludge which was operated stably more than one year. The results indicated that the wet density, the specific gravity and integrated coefficient (IC) of the short age aerobic granule were 1.