Tag: M.W=600-700

Gur-Reznik, Shirra published the artcileInfluence of seasonal and operating conditions on the rejection of pharmaceutical active compounds by RO and NF membranes, Application In Synthesis of 117-96-4, the main research area is seasonal variation carbamazepine diatrizoate reverse osmosis nanofiltration wastewater treatment.

The effect of seasonal changes, ionic strength, effluent dilution, transmembrane pressure and spiked concentration on the rejection of the pharmaceutical active compounds (PhACs), carbamazepine (CBZ) and diatrizoate (DTZ) by reverse osmosis (RO) and nanofiltration (NF), was studied. They represent two families of compounds owning low/medium hydrophobicity and relatively high stability to biol. transformation at wastewater treatment plant conditions, frequently present in effluents. Experiments were performed with membrane bioreactor effluents and ultrapure water (UPW) to test the influence of background matrix on the rejection. Three RO (BW, SW and XLE) and two NF (NF90 and NF270) membranes were tested. RO exhibited high rejection of both the compounds (> 98%) regardless of membrane resolution or conditions tested. The loosest membrane tested, NF270, displayed a marked seasonal influence on CBZ rejection from effluents (up to 92% in summer and down to 50% in winter), whereas its rejection from UPW was steady (74 ± 7%). These findings strongly suggest that interactions between low/medium hydrophobicity-PhACs and effluent organic matter (EfOM) took place which markedly changed rejection efficiencies. These interactions seem to be highly correlated to EfOM quality, being enhanced during summer, increasing the removal of small PhACs even by loose nonporous membranes, but decreasing during winter, thus reducing rejection.

Desalination published new progress about Ionic strength. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application In Synthesis of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Altmann, Johannes published the artcileIntegrating organic micropollutant removal into tertiary filtration: Combining PAC adsorption with advanced phosphorus removal, Related Products of isoquinoline, the main research area is powd activated carbon adsorption phosphorus removal organic micropollutant filtration; Adsorption; Deep-bed filtration; Organic micropollutants; Powdered activated carbon (PAC); Wastewater treatment.

Direct addition of powd. activated carbon (PAC) to a deep-bed filter was investigated at pilot-scale as a single advanced treatment stage for simultaneous removal of organic micropollutants (OMPs) and phosphorus from secondary effluent. PAC doses of 10-50 mg/L were assessed with regard to their impacts on filter performance and removal of 15 selected OMPs over a period of 18 mo. The PAC was effectively retained by the filter and had no neg. effect on filter head loss. Filter runtime until particle breakthrough depended mainly on coagulant dose and did not decrease significantly due to the addnl. PAC load. Removal of suspended solids and phosphorus by coagulation was effective independent of the PAC dose. A PAC dose of 35 mg/L PAC was suitable to remove well-adsorbing OMPs (e.g. carbamazepine, diclofenac) by >80% and medium adsorbing OMPs (e.g. primidone, sulfamethoxazole) by 50-80%. Median removals were 50-80% for well-adsorbing and 30-50% for medium adsorbing OMPs with 20 mg/L PAC. Abatement of all OMPs was low (<50%) with 10 mg/L PAC, possibly because of the high effluent organic matter content (median dissolved organic carbon (DOC) concentrations of 11.2 mg/L). In addition to adsorptive removal, relevant concentration decreases of certain OMPs (e.g. 4-formylaminoantipyrine) were attributed to biol. transformation in the filter. Adsorption onto accumulating PAC in the top layer of the filter bed led to improved OMP adsorption with increasing filter runtime. The comparison of OMP removal in the pilot filter with laboratory adsorption tests demonstrates that batch test results can be applied to estimate adsorptive OMP removal in real applications. Water Research published new progress about Organic matter. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Xu, Haodan published the artcileImproving PMS oxidation of organic pollutants by single cobalt atom catalyst through hybrid radical and non-radical pathways, Related Products of isoquinoline, the main research area is organic pollutant wastewater peroxymonosulfate oxidation catalyst cobalt nitrogen carbon.

Highly efficient single-atom catalysts attracted much research interest recently. Here we investigated the mechanism and application potential of a single cobalt atom catalyst (Co-N-C) in improving peroxymonosulfate (PMS) oxidation of several organic pollutants. With low cobalt content (0.45 at%), the Co-N-C was more active than Co3O4 for catalytic oxidation, and the PMS/Co-N-C oxidation achieved high pollutant removal rates over 60 h’ continuous flow reaction. Degradation of the selected pollutants followed distinct radical and non-radical pathways. Radical reaction dominated for the degradation of benzotriazole and diatrizoate; in comparision, non-radical oxidation was also significant during the degradation of 5-benzoyl-4-hydroxy-2-ethoxybenzenesulfonic acid and 2,4-dichlorophenol (2,4-DCP). The PMS/Co-N-C utilized more PMS oxidation capacity than PMS/Co2+ (100% vs. 86%) for the degradation of 2,4-DCP. The non-radical oxidation cannot be ascribed to singlet oxygen which has been frequently reported. The hybrid reaction pathways will make this PMS/Co-N-C oxidation process promising in removing complex water pollutants.

Applied Catalysis, B: Environmental published new progress about Binding energy. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Shuai, Danmeng published the artcileStructure Sensitivity Study of Waterborne Contaminant Hydrogenation Using Shape- and Size-Controlled Pd Nanoparticles, Application of Diatrizoic Acid, the main research area is structure sensitivity waterborne contaminant hydrogenation shape size palladium nanoparticle.

Catalytic reduction with Pd has emerged as a promising technol. to remove a suite of contaminants from drinking water, such as oxyanions, disinfection byproducts, and halogenated pollutants, but low activity is a major challenge for application. We synthesized a set of shape- and size-controlled Pd nanoparticles and evaluated the activity of 3 probe contaminants (i.e., nitrite, N-nitrosodimethylamine (NDMA), and diatrizoate) as a function of facet type (e.g., (100), (110), (111)), ratios of low- to high-coordination sites, and ratios of surface sites to total Pd (i.e., dispersion). Reduction results for an initial contaminant concentration of 100μM show that initial turnover frequency (TOF0) for nitrite increases 4.7-fold with increasing percent of (100) surface Pd sites (from 0% to 95.3%), whereas the TOF0 for NDMA and for diatrizoate increases 4.5- and 3.6-fold, resp., with an increasing percent of terrace surface Pd sites (from 79.8% to 95.3%). Results for an initial nitrite concentration of 2mM show that TOF0 is the same for all shape- and size-controlled Pd nanoparticles. Trends for TOF0 were supported by results showing that all catalysts but one were stable in shape and size ≤12 days; for the exception, iodide liberation in diatrizoate reduction appeared to be responsible for a shape change of 4 nm octahedral Pd nanoparticles. D. functional theory (DFT) simulations for the free energy change of H, nitrite, and NO adsorption and a 2-site model based on the Langmuir-Hinshelwood mechanism suggest that competition of adsorbates for different Pd sites can explain the TOF0 results. Our study shows for the 1st time that catalytic reduction activity for waterborne contaminant removal varies with the Pd shape and size, and it suggests that Pd catalysts can be tailored for optimal performance to treat a variety of contaminants in drinking water.

ACS Catalysis published new progress about Binding energy. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application of Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Muntau, Meriam published the artcileEvaluation of the short-term fate and transport of chemicals of emerging concern during soil-aquifer treatment using select transformation products as intrinsic redox-sensitive tracers, Category: isoquinoline, the main research area is soil aquifer treatment wastewater transformation product tracer; Chemicals of emerging concern; Dissolved organic carbon; Iopromide; Soil-aquifer treatment; Transformation products.

In this study, known products from oxic transformation of the X-ray contrast medium iopromide were introduced for the first time as intrinsic tracer for in situ characterization of the transition zone between oxic and suboxic conditions during the initial phase of soil-aquifer treatment (SAT). Two wet-dry cycles of a full-scale infiltration basin were monitored to characterize hydraulic retention times, redox conditions, removal of bulk organic parameters and the fate of chems. of emerging concern (CECs). Tracer tests at the site showed an average hydraulic retention time of < 20 h before collection in drainage pipes located approx. 1.5 m below surface. Dissolved oxygen at different depth rapidly depleted and only increased towards the end of the flooding event. Transformation of iopromide and all known intermediates to persistent transformation products (TPs) usually occurring during oxic biodegradation was very limited in samples from suction cups immediately underneath the basin. But transformation was complete in samples collected from the drainage outlet indicating that dissolved oxygen had been introduced to the system before sample collection in the combined drainage outlet. Similar to iopromide and its TPs, removal of several CECs (diclofenac, bezafibrate, mecoprop, TCEP) was inefficient after 90 cm infiltration (< 35%) but significantly enhanced in the combined drainage outlet (> 80%). These results highlight that the anal. of iopromide along with its intermediates and persistent TPs can serve as a promising probing tool to determine overall efficiency of CEC biodegradation and to identify potential in situ oxygen limitations.

Science of the Total Environment published new progress about Biodegradation. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Category: isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Mueller, Birgit M. published the artcileSimultaneous attenuation of trace organics and change in organic matter composition in the hyporheic zone of urban streams, Application of Diatrizoic Acid, the main research area is trace organic matter hyporheic zone wastewater treatment.

Trace organic compounds (TrOCs) enter rivers with discharge of treated wastewater. These effluents can contain high loads of dissolved organic matter (DOM). In a 48 h field study, we investigated changes in mol. composition of seven DOM compound classes (FTICR-MS) and attenuation of 17 polar TrOCs in a small urban stream receiving treated wastewater. Correlations between TrOCs and DOM were used to identify simultaneous changes in surface water and the hyporheic zone. Changes in TrOC concentrations in surface water ranged between a decrease of 29.2% for methylbenzotriazole and an increase of 152.2% for the transformation product gabapentin-lactam. In the hyporheic zone, only decreasing TrOC concentrations were observed, ranging from 4.9% for primidone to 93.8% for venlafaxine . TrOC attenuation coincided with a decline of mol. diversity of easily biodegradable DOM compound classes while mol. diversity of poorly biodegradable DOM compound classes increased. This concurrence indicates similar or linked attenuation pathways for biodegradable DOM and TrOCs. Strong correlations between TrOCs and DOM compound classes as well as high attenuation of TrOCs primarily occurred in the hyporheic zone. This suggests high potential for DOM turnover and TrOC mitigation in rivers if hyporheic exchange is sufficient.

Scientific Reports published new progress about Biodegradation. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application of Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Anquandah, George published the artcileOxidation of X-ray compound diatrizoic acid by ferrate(VI), Product Details of C11H9I3N2O4, the main research area is oxidation Xray compound diatrizoate ferrate.

Iodinated x-ray contrast media (ICM) such as diatrizoic acid (DTZA) is used in large amounts in hospitals to enhance imaging of organs and blood vessels during radiog. Due to its persistence and non-biodegradability, it is found in treated water, sewage effluent, surface waters, and aquatic environments. This paper presents the kinetics of the oxidation of DTZA by ferrate(VI) (FeVIO42-, Fe(VI)) as a function of pH (7.1-9.6) at 25° in order to determine the effectiveness of Fe(VI) to remove DTZA from water. The reaction was 1st-order with respect to concentrations of Fe(VI) and DTZA. The rate of the reaction was pH-dependent and the rate decreased nonlinearly as the pH increased from 7.1 to 9.6. The speciation of Fe(VI) (HFeO4- and FeO42-) was used to explain the rate dependence on pH. The calculated rate constant of Fe(VI) with DTZA at pH 7.0 was compared with N-containing pollutants and is discussed.

Environmental Technology published new progress about Oxidation kinetics. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Product Details of C11H9I3N2O4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yang, Jingxin published the artcileUnexpected degradation and deiodination of diatrizoate by the Cu(II)/S(IV) system under anaerobic conditions, Formula: C11H9I3N2O4, the main research area is diatrizoate degradation deiodination copper sulfite system anaerobic condition; Anaerobic degradation; Cu(I); copper; deiodination; diatrizoate; sulfite.

Transition metal catalyzed sulfite auto-oxidation is a promising technol. used in water and wastewater treatment for the elimination of contaminants. In the literature, this process has been reported to be efficient only in the presence of oxygen. However, in this study, we unexpectedly found that the degradation of diatrizoate (DTZ) by a system based on the combination of copper ion and sulfite (Cu(II)/S(IV)) reached over 95% under anaerobic conditions, but was considerably retarded under aerobic conditions at pH 7. Furthermore, it was found that Cu(I), generated from the cleavage of the CuSO3 complex, was the main reactive species responsible for the degradation of DTZ by the Cu(II)/S(IV) system under anaerobic conditions. In fact, the absence of oxygen promoted the accumulation of Cu(I). The concomitant release of the iodide ion with the degradation of DTZ indicated that the anaerobic degradation of DTZ by the Cu(II)/S(IV) system mainly proceeded through the deiodination pathway, which was also confirmed by the detection of deiodinated products. The anaerobic degradation of DTZ was favored at higher initial concentrations of Cu(II) or sulfite in this system. Since the CuSO3 complex, the precursor of Cu(I), was formed mainly at pH 7, the highest anaerobic degradation of DTZ was achieved at pH 7. An increase in reaction temperature considerably enhanced the degradation of DTZ by the Cu(II)/S(IV) system with an apparent activation energy of 119.4 kJ/mol. The presence of chloride, bicarbonate and humic acid slightly influenced the anaerobic degradation of DTZ. The experiments with real water samples also demonstrated the effectiveness of the degradation of DTZ by the Cu(II)/S(IV) system under anaerobic conditions.

Water Research published new progress about Activation energy. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Formula: C11H9I3N2O4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

He, Pan-Pan published the artcileDehalogenation of diatrizoate using nanoscale zero-valent iron: impacts of various parameters and assessment of aerobic biological post-treatment, SDS of cas: 117-96-4, the main research area is diatrizoate dehalogenation aerobic biol post treatment.

This study investigated the feasibility of nanoscale zero-valent iron (nZVI) for reductive dehalogenation of iodinated contrast medium diatrizoate (DTA). The impacts of various parameters, including nZVI dosage, DTA concentration, solution pH, aging time of nZVI, the presence of natural organic matter, and the type of competitive anions, on the dehalogenation of DTA as well as the formation of its reductive product 5-diacetamidobenzoate (DABA) using nZVI were evaluated. Furthermore, an aerobic biol. post-treatment was conducted to study the biodegradability of reductive products of DTA dehalogenation using nZVI. The results showed that dosing with 0.5 g L-1 nZVI particles resulted in a rapid decrease in DTA concentration and a corresponding rise of the concentrations of DABA and I-. DTA dehalogenation in terms of its removal and DABA formation was enhanced with the increase in nZVI dosage but deteriorated when increasing solution pH. nZVI aging time had a neg. impact on DTA dehalogenation. Natural organic matter at much low level could improve DTA dehalogenation, while had a neg. influence at high concentrations Contrary to sulfate, the presence of nitrate and phosphate strongly inhibited DTA removal using nZVI. The results also showed that the reductive product DABA could be degraded by aerobic biol. post-treatment, suggesting DTA dehalogenation with nZVI may be a vital procedure for its biodegradability improvement and consequently complete removal.

RSC Advances published new progress about Aging of materials. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, SDS of cas: 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Zhou, Guan-Nan published the artcileAerobic removal of iodinated contrast medium by nano-sized zero-valent iron: A combination of oxidation and reduction, Related Products of isoquinoline, the main research area is zero valent iron nanosize ICM aerobic removal oxidation reduction; Aerobic conditions; Diatrizoate; Nano-sized zero-valent iron; Oxidation; Reduction.

The removal performance and mechanisms of diatrizoate (DTA), a typical iodinated contrast medium, from water by nano-sized zero-valent iron (nZVI) under aerobic conditions were investigated in this study. Reactive oxygen species (ROS) and transformation products were detected with ESR and liquid chromatog. electrospray ionization tandem mass spectrometry, resp. Furthermore, the effects of several operational parameters on DTA removal were illustrated. The results showed that nZVI had a much higher DTA removal ability compared to microscale zero-valent iron (mZVI) in the presence of oxygen. Moreover, the detection of ROS and I- as well as the anal. of intermediate products suggested a combination of oxidation and reduction pathways for DTA removal by nZVI under aerobic conditions. Addnl., a high dosage of nZVI and acidic conditions led to the enhancement of DTA removal, while nZVI aging, as well as chloride and nitrate ions in the solution, had neg. effects on the degradation of DTA by nZVI in the presence of oxygen.

Journal of Hazardous Materials published new progress about Aging of materials. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem