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https://www.readbyqxmd.com/read/28810228/evolution-of-molecular-weight-and-fluorescence-of-effluent-organic-matter-efom-during-oxidation-processes-revealed-by-advanced-spectrographic-and-chromatographic-tools
#1
Zhiqiang Chen, Mo Li, Qinxue Wen, Nanqi Ren
Effluent organic matter (EfOM) is an emerging concern to receiving aquatic environment due to its refractory property. The degradation of EfOM in ozonation and other two advanced oxidation processes (AOPs), UV/H2O2 and UV/persulfate (PS), was investigated in this study. Fluorescence spectra coupled with parallel factor analysis (PARAFAC) and two-dimensional correlation gel permeation chromatography (2D-GPC) were used to track the evolution of EfOM during each oxidation process. Results showed that the degradation of EfOM indicated by dissolved organic carbon (DOC), UV254 and fluorescence components, fitted well with pseudo-first-order kinetic model during the oxidation processes...
August 4, 2017: Water Research
https://www.readbyqxmd.com/read/28810226/rapid-removal-of-organic-pollutants-by-activation-sulfite-with-ferrate
#2
Jing Zhang, Liang Zhu, Zhenyu Shi, Ying Gao
With the addition of sulfite, almost complete removal of seven out of eight tested contaminants, i.e. benzotriazole, phenol, ciprofloxacin, methyl blue, rhodamine B, methyl orange and sulfamethoxazole, was observed in 30 s except for sulfamethoxazole at pH 9.0, while Fe(VI) alone only resulted in less than 6% removal. In this study, the mechanism of sulfite/Fe(VI) process was explored for the first time. Firstly, sulfite attacks Fe(VI) via a 1-e(-) transfer forming the primary sulfite radical (SO3(-)), then SO3(-) reacts rapidly with oxygen in a diffusion controlled rate to form a much more reactive peroxyl radical SO5(-), which further reacts with HSO3(-) and produces SO4(-)...
July 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28809556/radical-chemistry-and-structural-relationships-of-ppcp-degradation-by-uv-chlorine-treatment-in-simulated-drinking-water
#3
Kaiheng Guo, Zihao Wu, Chii Shang, Bo Yao, Shaodong Hou, Xin Yang, Weihua Song, Jingyun Fang
The UV/chlorine process is an emerging advanced oxidation process (AOP) used for the degradation of micropollutants. However, the radical chemistry of this AOP is largely unknown for the degradation of numerous structurally diverse micropollutants in water matrices of varying quality. These issues were addressed by grouping 34 pharmaceuticals and personal care products (PPCPs) according to the radical chemistry of their degradation in the UV/chlorine process at practical PPCP concentrations (1 μg L-1) and in different water matrices...
August 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28803372/oxidation-of-winery-wastewater-by-sulphate-radicals-catalytic-and-solar-photocatalytic-activations
#4
Jorge Rodríguez-Chueca, Carlos Amor, Joana Mota, Marco S Lucas, José A Peres
The treatment of winery effluents through sulphate radical-based advanced oxidation processes (SR-AOPs) driven by solar radiation is reported in this study. Photolytic and catalytic activations of peroxymonosulphate (PMS) and persulphate (KPS and SPS) at different pH values (4.5 and 7) were studied in the degradation of organic matter. Portugal is one of the largest wine producers in Europe. The wine making activities generate huge volume of effluents characterized by a variable volume and organic load, being their seasonal nature one of the most important drawbacks...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803054/decolorization-of-reactive-azo-dyes-using-a-sequential-chemical-and-activated-sludge-treatment
#5
Ken Meerbergen, Sam Crauwels, Kris A Willems, Raf Dewil, Jan Van Impe, Lise Appels, Bart Lievens
Textile wastewater contains high concentrations of organic substances derived from diverse dyes and auxiliary chemicals, some of which are non-biodegradable and/or toxic. Therefore, it is essential that textile wastewater is treated and that these substances are removed before being discharged into the environment. A combination of advanced oxidation processes (AOPs) to obtain partial dye degradation followed by a biological treatment has been suggested as a promising method for cost-effective decolorization of wastewater...
August 9, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28780335/chemical-instability-of-graphene-oxide-following-exposure-to-highly-reactive-radicals-in-advanced-oxidation-processes
#6
Zhaohui Wang, Linyan Sun, Xiaoyi Lou, Fei Yang, Min Feng, Jianshe Liu
The rapidly increasing and widespread use of graphene oxide (GO) as catalyst supports, requires further understanding of its chemical stability in advanced oxidation processes (AOPs). In this study, UV/H2O2 and UV/persulfate (UV/PS) processes were selected to test the chemical instability of GO in terms of their performance in producing highly reactive hydroxyl radicals (OH) and sulfate radicals (SO4(-)), respectively. The degradation intermediates were characterized using UV-visible absorption spectra (UV-vis), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Raman spectroscopy, and matrix-assisted laser desorption and ionization time-of-flight mass spectrometry (MALDI-TOF-MS)...
July 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28764137/modeling-the-aqueous-phase-reactivity-of-hydroxyl-radical-towards-diverse-organic-micropollutants-an-aid-to-water-decontamination-processes
#7
Shikha Gupta, Nikita Basant
The rate constants of the hydroxyl radical reactions (kOH) with organic micropollutants (OMPs) in aqueous medium are important in designing the advanced oxidation processes (AOPs) for their removal. In this study, a quantitative structure-property relationship (QSPR) model for the prediction of kOH of diverse and emerging OMPs was developed in accordance with the OECD guidelines. A large experimental data set (n = 995) comprised of compounds with kOH values ranging from 7.9 × 10(5) to 6.8 × 10(10) M(-1) s(-1) was considered and several molecular descriptors were calculated...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28748205/dataset-demonstrating-the-temperature-effect-on-average-output-polarization-for-qca-based-reversible-logic-gates
#8
Md Kamrul Hassan, Nur Mohammad Nahid, Ali Newaz Bahar, Mohammad Maksudur Rahman Bhuiyan, Md Abdullah-Al-Shafi, Kawsar Ahmed
Quantum-dot cellular automata (QCA) is a developing nanotechnology, which seems to be a good candidate to replace the conventional complementary metal-oxide-semiconductor (CMOS) technology. In this article, we present the dataset of average output polarization (AOP) for basic reversible logic gates presented in Ali Newaz et al. (2016) [1]. QCADesigner 2.0.3 has been employed to analysis the AOP of reversible gates at different temperature levels in Kelvin (K) unit.
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28741346/occurrence-state-and-molecular-structure-analysis-of-extracellular-proteins-with-implications-on-the-dewaterability-of-waste-activated-sludge
#9
Boran Wu, Bing-Jie Ni, Kristine Horvat, Liyan Song, Xiaoli Chai, Xiaohu Dai, Devinder Mahajan
The occurrence state and molecular structure of extracellular proteins were analyzed to reveal the influencing factors on the water-holding capacities of protein-like substances in waste-activated sludge (WAS). The gelation process of extracellular proteins verified that advanced oxidation processes (AOPs) for WAS dewaterability improvement eliminated the water affinity of extracellular proteins and prevented these macromolecules from forming stable colloidal aggregates. Isobaric tags for relative and absolute quantitation proteomics identified that most of the extracellular proteins were originally derived from the intracellular part and the proteins originally located in the extracellular part were mainly membrane-associated...
August 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28741247/contaminants-of-emerging-concern-a-review-of-new-approach-in-aop-technologies
#10
Maryam Salimi, Ali Esrafili, Mitra Gholami, Ahmad Jonidi Jafari, Roshanak Rezaei Kalantary, Mahdi Farzadkia, Majid Kermani, Hamid Reza Sobhi
The presence of contaminants of emerging concern (CECs) such as pharmaceuticals and personal care products (PPCPs), endocrine-disrupting compounds (EDCs), flame retardants (FRs), pesticides, and artificial sweeteners (ASWs) in the aquatic environments remains a major challenge to the environment and human health. In this review, the classification and occurrence of emerging contaminants in aquatic environments were discussed in detail. It is well documented that CECs are susceptible to poor removal during the conventional wastewater treatment plants, which introduce them back to the environment ranging from nanogram per liter (e...
August 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28738718/correlation-between-clinical-fetal-head-station-and-sonographic-angle-of-progression-during-the-second-stage-of-labor
#11
Sharon Perlman, Zvi Kivilevitch, Orit Moran, Eldad Katorza, Salim Kees, Reuven Achiron, Yinon Gilboa
PURPOSE: To investigate the correlation between the angle of progression and the clinical fetal head station (FHS) during the second stage of labor, and to build reference range. MATERIALS AND METHODS: A prospective, observational study was conducted. Women carrying singleton term pregnancies were enrolled during the second stage of labor. FHS was assessed manually by a senior obstetrician, while the angle of progression (AOP) was assessed by transperineal ultrasound (TPU)...
July 24, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28732400/solar-photocatalytic-disinfection-of-agricultural-pathogenic-fungi-curvularia-sp-in-real-urban-wastewater
#12
Yelitza Aguas, Margarita Hincapie, Pilar Fernández-Ibáñez, María Inmaculada Polo-López
The interest in developing alternative water disinfection methods that increase the access to irrigation water free of pathogens for agricultural purposes is increasing in the last decades. Advanced Oxidation Processes (AOPs) have been demonstrated to be very efficient for the abatement of several kind of pathogens in contaminated water. The purpose of the current study was to evaluate and compare the capability of several solar AOPs for the inactivation of resistant spores of agricultural fungi. Solar photoassisted H2O2, solar photo-Fenton at acid and near-neutral pH, and solar heterogeneous photocatalysis using TiO2, with and without H2O2, have been studied for the inactivation of spores of Curvularia sp...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28732198/primary-cell-phenotypic-screening-illuminates-adrs-and-aops
#13
Audrey J Bone, Keith A Houck
Preclinical, in vitro screening for adverse drug reactions continues to present challenges in the field of drug development. In this issue of Cell Chemical Biology, Shah et al. (2017) employ a phenotypic screening strategy using a panel of human primary cells to define a signature response and an adverse outcome pathway for delayed type IV skin hypersensitivity.
July 20, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28728121/effect-of-residual-h2o2-from-advanced-oxidation-processes-on-subsequent-biological-water-treatment-a-laboratory-batch-study
#14
Feifei Wang, Doris van Halem, Gang Liu, Karin Lekkerkerker-Teunissen, Jan Peter van der Hoek
H2O2 residuals from advanced oxidation processes (AOPs) may have critical impacts on the microbial ecology and performance of subsequent biological treatment processes, but little is known. The objective of this study was to evaluate how H2O2 residuals influence sand systems with an emphasis on dissolved organic carbon (DOC) removal, microbial activity change and bacterial community evolution. The results from laboratory batch studies showed that 0.25 mg/L H2O2 lowered DOC removal by 10% while higher H2O2 concentrations at 3 and 5 mg/L promoted DOC removal by 8% and 28%...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28704660/pathway-analysis-of-systemic-transcriptome-responses-to-injected-polystyrene-particles-in-zebrafish-larvae
#15
Wouter J Veneman, Herman P Spaink, Nadja R Brun, Thijs Bosker, Martina G Vijver
Microplastics are a contaminant of emergent concern in the environment, however, to date there is a limited understanding on their movement within organisms and the response of organisms. In the current study zebrafish embryos at different development stages were exposed to 700nm fluorescent polystyrene (PS) particles and the response pathway after exposure was investigated using imaging and transcriptomics. Our results show limited spreading of particles within the larvae after injection during the blastula stage...
September 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28704612/blood-flow-in-humans-following-low-load-exercise-with-and-without-blood-flow-restriction
#16
J Grant Mouser, Gilberto C Laurentino, Scott J Dankel, Samuel L Buckner, Matthew B Jessee, Brittany R Counts, Kevin T Mattocks, Jeremy P Loenneke
Blood flow restriction (BFR) in combination with exercise has been used to increase muscle size and strength using relatively low loads (20%-30% 1RM). In research, the range of applied pressures based on a percentage of arterial occlusion pressure (AOP), is wide. PURPOSE: To measure the blood flow response before, following each set of exercise, and post exercise to low-load elbow flexion combined with no restriction (NOBFR), 40% of AOP (40BFR), and 80% of AOP (80BFR). METHODS: 152 participants volunteered; 140 completed the protocol (women=75, men=65)...
July 13, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28696913/linking-physiological-parameters-to-perturbations-in-the-human-exposome-environmental-exposures-modify-blood-pressure-and-lung-function-via-inflammatory-cytokine-pathway
#17
Matthew A Stiegel, Joachim D Pleil, Jon R Sobus, Tina Stevens, Michael C Madden
Human biomonitoring is an indispensable tool for evaluating the systemic effects derived from external stressors including environmental pollutants, chemicals from consumer products, and pharmaceuticals. The aim of this study was to explore consequences of environmental exposures to diesel exhaust (DE) and ozone (O3) and ultimately to interpret these parameters from the perspective of in vitro to in vivo extrapolation. In particular, the objective was to use cytokine expression at the cellular level as a biomarker for physiological systemic responses such as blood pressure and lung function at the systemic level...
July 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28689383/-apnea-of-prematurity-characteristic-and-treatment
#18
Aleksandra Goryniak, Angelika Szczęśniak, Daria Śleboda, Barbara Dołęgowska
Apnea of prematurity (AOP) can affect even 85-100% of premature newborns and is related to lack of full maturity of organs. AOP is manifesting by 15-20 seconds cessations of breathing accompanied by bradycardia and oxygen desaturation, what can lead to hypoxia or death. Therefore it is very important to implement the effective and safe treatment immediately after birth. Widely used caffeine citrate, which stimulates the respiratory system, improving the working of the respiratory muscles. However the metabolism of caffeine citrate is difficult in preterm infants due to the immaturity of the hepatic enzyme system, what can lead to the occurrence of side effects and toxicity...
2017: Postepy Biochemii
https://www.readbyqxmd.com/read/28681293/ferrous-activated-peroxymonosulfate-oxidation-of-antimicrobial-agent-sulfaquinoxaline-and-structurally-related-compounds-in-aqueous-solution-kinetics-products-and-transformation-pathways
#19
Yuefei Ji, Lu Wang, Mengdi Jiang, Yan Yang, Peizeng Yang, Junhe Lu, Corinne Ferronato, Jean-Marc Chovelon
Sulfaquinoxaline (SQX) is a coccidiostatic drug widely used in poultry and swine production and has been frequently detected in various environmental compartments such as surface water, groundwater, soils, and sediments. In the present study, degradation of SQX by ferrous ion-activated peroxymonosulfate oxidation process (Fe(II)/PMS), a promising in situ chemical oxidation (ISCO) technique, was systematically investigated. Experimental results showed that Fe(II)/PMS process appeared to be more efficient for SQX removal relative to Fe(II)/persulfate process (Fe(II)/PS)...
July 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28672875/light-assisted-advanced-oxidation-processes-for-the-elimination-of-chemical-and-microbiological-pollution-of-wastewaters-in-developed-and-developing-countries
#20
REVIEW
Stefanos Giannakis, Sami Rtimi, Cesar Pulgarin
In this work, the issue of hospital and urban wastewater treatment is studied in two different contexts, in Switzerland and in developing countries (Ivory Coast and Colombia). For this purpose, the treatment of municipal wastewater effluents is studied, simulating the developed countries' context, while cheap and sustainable solutions are proposed for the developing countries, to form a barrier between effluents and receiving water bodies. In order to propose proper methods for each case, the characteristics of the matrices and the targets are described here in detail...
June 26, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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