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https://www.readbyqxmd.com/read/28521205/preparation-and-characterization-of-a-novel-macroporous-silica-bipyridine-asymmetric-multidentate-functional-adsorbent-and-its-application-for-heavy-metal-palladium-removal
#1
Lei Xu, Anyun Zhang, Fengmei Zhang, Jiyong Liu
The effective removal of heavy metal (107)Pd(II) from highly active liquid waste (HLW) is very valuable for reducing its hazardous and risk to public health and environment. For this purpose, a novel silica-bipyridine multidentate functional adsorbent was synthesized by vacuum infusing a new asymmetric N-donor ligand CA-MTBP (bipyridine derivative) into the macroporous SiO2-P support. SEM, N2 adsorption-desorption isotherms, TGA, XRD, FT-IR, (29)Si solid-state NMR and XPS spectroscopy were utilized to systematically characterize the physicochemical properties of the adsorbent...
April 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28521163/application-for-oxytetracycline-wastewater-pretreatment-by-fenton-iron-mud-based-cathodic-anodic-electrolysis-ceramic-granular-fillers
#2
Feilong Zhang, Qinyan Yue, Yuan Gao, Baoyu Gao, Xing Xu, Zhongfei Ren, Yang Jin
In this study, Fenton iron mud applied as main raw material of cathodic-anodic-electrolysis ceramic granular fillers (ICMF) in a continuous reactor, which were used to pretreat oxytetracycline (OTC) wastewater. The ICMF was characterized by Scanning Electron Microscope and Energy Dispersive Spectrometer analysis. The effects of pH value, hydraulic retention time, OTC concentrations and aeration on removal efficiency of total organic carbon (TOC) and OTC were studied. The degradation byproducts of OTC were analyzed by UV-2450, High Performance Liquid Chromatography and Liquid Chromatography-mass Spectrometry...
May 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28520413/temporal-characteristics-of-brown-carbon-over-the-central-indo-gangetic-plain
#3
Rangu Venkata Satish, Puthukkadan Moosakutty Shamjad, Navaneeth M Thamban, Sachchida N Tripathi, Neeraj Rastogi
Recent global models estimate that light absorption by brown carbon (BrC) in several regions of the world is ~30-70% of that due to black carbon (BC). It is, therefore, important to understand its sources and characteristics on temporal and spatial scale. In this study, we conducted semi-continuous measurements of water-soluble organic carbon (WSOC) and BrC using particle-into-liquid sampler coupled with liquid waveguide capillary cell and total carbon analyzer (PILS-LWCC-TOC) over Kanpur (26.5°N, 80.3°E, 142 m amsl) during a winter season (December 2015 to February 2016)...
May 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28516066/the-alpha-tocopherol-form-of-vitamin-e-boosts-elastase-activity-of-human-pmns-and-their-ability-to-kill-streptococcus-pneumoniae
#4
Elsa N Bou Ghanem, James N Lee, Basma H Joma, Simin N Meydani, John M Leong, Alexander Panda
Despite the availability of vaccines, Streptococcus pneumoniae remains a leading cause of life-threatening infections, such as pneumonia, bacteremia and meningitis. Polymorphonuclear leukocytes (PMNs) are a key determinant of disease course, because optimal host defense requires an initial robust pulmonary PMN response to control bacterial numbers followed by modulation of this response later in infection. The elderly, who manifest a general decline in immune function and higher basal levels of inflammation, are at increased risk of developing pneumococcal pneumonia...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28514836/oxidation-of-organic-contaminant-in-a-self-driven-electro-natural-maghemite-peroxydisulfate-system-efficiency-and-mechanism
#5
Suding Yan, Weihui Xiong, Shuya Xing, Yueqi Shao, Rui Guo, Hui Zhang
Electro-assisted iron-mediated persulfate (PS) activation process has been successfully employed to oxidize organic contaminant. However, a majority of iron-based catalysts used for PS activation was synthesized through complicated or demanding procedures and may have potential risks on environment during the preparation process. Herein, natural maghemite (NM) which is abundant on the earth was employed to activate peroxydisulfate (PDS) in an electrolytic cell. The voltage was provided by microbial fuel cell (MFC) instead of external power as reported in the previous studies, so as to establish a self-driven electro/natural maghemite/PDS system (MFC/NM/PDS) for the oxidation of acid orange 7 (AO7)...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28513335/tio2-uv-assisted-rhodamine-b-degradation-putative-pathway-and-identification-of-intermediates-by-uplc-ms
#6
Tahir Rasheed, Muhammad Bilal, Hafiz M N Iqbal, Syed Zakir Hussain Shah, Hongbo Hu, Xuehong Zhang, Yongfeng Zhou
The present study was designed to evaluate the photocatalytic degradation of Rhodamine B (Rh-B) in a self-assembled TiO2 assisted system under UV light irradiation. Chemical oxygen demand (COD), total organic carbon (TOC), and high-performance liquid chromatography (HPLC) analyses confirmed the elevated Rh-B degradation level. A stepwise meticulous breakdown pathway based on the ultra-performance liquid chromatography coupled with electrospray ionization mass spectrometry (UPLC-MS) is proposed. Results demonstrated that the degradation of Rh-B mainly occurred via N-de-ethylation process, and N-de-ethylated intermediate products were further oxidized into acids and alcohols...
May 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28511354/occurrence-distribution-and-sources-of-bisphenol-analogues-in-a-shallow-chinese-freshwater-lake-taihu-lake-implications-for-ecological-and-human-health-risk
#7
Yanhua Liu, Shenghu Zhang, Ninghui Song, Ruixin Guo, Meihong Chen, Dina Mai, Zhengyu Yan, Zhihua Han, Jianqiu Chen
Since the production and use of BPA were regulated in China around 2008, several bisphenol analogues were widely used to substitute BPA in the manufacture of polycarbonates, epoxy resins, and plastics. However, there is limited understanding of the spatial distribution, potential sources and risk assessment for those bisphenol analogues. In this study, seven bisphenol analogues were investigated in water and sediment samples from Taihu Lake, China. Compared to the same lake in 2013 (range: 5.4-87ng/L for waters and 0...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28508337/natural-radionuclide-dose-and-lifetime-cancer-risk-due-to-ingestion-of-fish-and-water-from-fresh-water-reservoirs-near-the-proposed-uranium-mining-site
#8
Sathesh Kumar Annamalai, Kantha Deivi Arunachalam, Rajaram Selvaraj
Ten sampling locations in Nagarjuna Sagar Dam have been selected to assess the suitability of the reservoir water for human consumption. The sediment, water, and fish samples were collected and analyzed for radionuclide ((238)U, (232)Th, (210)Po, (226)Ra, (210)Pb) and physicochemical parameters like pH, TOC, total hardness, alkalinity, DO, cation exchange capacity, and particle size. The spatial variations among the radionuclides ((238)U, (232)Th, (210)Po, (226)Ra, (210)Pb) in water and bottom sediments of Nagarjuna Sagar Dam were determined...
May 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28506976/implementation-of-postdischarge-follow-up-telephone-calls-at-a-comprehensive-cancer-center
#9
Shrina D Patel, Phuoc Anh Anne Nguyen, Melissa Bachler, Bradley Atkinson
PURPOSE: The development and implementation of a pharmacy-driven, postdischarge follow-up telephone call program to assess medication adherence, provide education, and address medication-related concerns are discussed. SUMMARY: Many readmissions are avoidable through effective discharge planning and patient follow-up after hospitalization. However, there is limited information on how to effectuate this process. To address this barrier, a team consisting of a clinical pharmacy specialist, a clinical pharmacy manager, a postgraduate year 1 pharmacy resident, and an education specialist at The University of Texas MD Anderson Cancer Center collaborated to create a postdischarge telephone call program within a transitions-of-care (TOC) pilot program...
June 1, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28505531/rapid-degradation-mineralization-and-detoxification-of-pharmaceutically-active-compounds-in-aqueous-solution-during-pulsed-corona-discharge-treatment
#10
Raj Kamal Singh, Ligy Philip, Sarathi Ramanujam
In the present study, plasma generated by pulsed corona discharge was used for the degradation of diclofenac, carbamazepine and ciprofloxacin. Pollutants in aqueous solution were plasma treated under two categories: single and mixed pollutant condition. Mixed pollutant condition showed an antagonistic behaviour and thus the degradation time was higher for mixed condition compared to the single condition. At different voltage and frequencies, degradation efficiency followed the trend, diclofenac>carbamazepine>ciprofloxacin...
May 7, 2017: Water Research
https://www.readbyqxmd.com/read/28505530/photocatalytic-wastewater-purification-with-simultaneous-hydrogen-production-using-mos2-qd-decorated-hierarchical-assembly-of-znin2s4-on-reduced-graphene-oxide-photocatalyst
#11
Shuqu Zhang, Longlu Wang, Chengbin Liu, Jinming Luo, John Crittenden, Xia Liu, Tao Cai, Jili Yuan, Yong Pei, Yutang Liu
It is attractive to photocatalytically purify wastewater and simultaneously convert solar energy into clean hydrogen energy. However, it is still a challenge owing to the relatively low photocatalytic efficiency of photocatalysts. In this study, we synthesized a molybdenum disulfide (MoS2) quantum dot-decorated 3D nanoarchitecture (MoS2QDs) of indium zinc sulfide (ZnIn2S4) and reduced grapheme oxide (MoS2QDs@ZnIn2S4@RGO) photocatalyst using a simple solvothermal method. The RGO promotes the electron transfer, and the highly dispersed MoS2QDs provides numerous catalytic sites...
May 10, 2017: Water Research
https://www.readbyqxmd.com/read/28501570/electrocatalytic-properties-of-n-doped-graphite-felt-in-electro-fenton-process-and-degradation-mechanism-of-levofloxacin
#12
Xiaocheng Liu, Danxing Yang, Yaoyu Zhou, Jiachao Zhang, Lin Luo, Sijun Meng, Song Chen, Mengjiao Tan, Zhicheng Li, Lin Tang
The degradation of antibiotic levofloxacin was investigated by dimensionally stable anode as well as modified cathode using low-cost chemical reagents of hydrazine hydrate and ethanol for electro-Fenton in an undivided cell at pH 3.0 under room temperature. Comparison of unmodified and modified cathode was performed. The apparent rate constant of levofloxacin decay was found to be 0.2883 min(-1) for graphite felt-10 with the best performance at 200 mA, which is lower than graphite felt at 400 mA. The optimum modified cathode showed a significant improvement of complete mineralization of levofloxacin, reaching a 92% TOC removal at 200 mA for 480 min higher than unmodified one at twice the current...
May 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28495233/sorption-and-speciation-of-iodine-in-groundwater-system-the-roles-of-organic-matter-and-organic-mineral-complexes
#13
Junxia Li, Hailing Zhou, Yanxin Wang, Xianjun Xie, Kun Qian
Characterizing the properties of main host of iodine in soil/sediment and the geochemical behaviors of iodine species are critical to understand the mechanisms of iodine mobilization in groundwater systems. Four surface soil and six subsurface sediment samples were collected from the iodine-affected area of Datong basin in northern China to conduct batch experiments and to evaluate the effects of NOM and/or organic-mineral complexes on iodide/iodate geochemical behaviors. The results showed that both iodine contents and kf-iodate values had positive correlations with solid TOC contents, implying the potential host of NOM for iodine in soil/sediment samples...
April 24, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28494246/catalytic-hydrodechlorination-of-triclosan-using-a-new-class-of-anion-exchange-resin-supported-palladium-catalysts
#14
Bing Han, Wen Liu, Jingwen Li, Jin Wang, Dongye Zhao, Rui Xu, Zhang Lin
We prepared a new class of anion-exchange-resin supported Pd catalysts for efficient hydrodechlorination of triclosan in water. The catalysts were prepared through an initial ion-exchange uptake of PdCl4(2-) and subsequent reduction of Pd(II) to Pd(0) nanoparticles at ambient temperature. Two standard strong-base anion exchange resins (IRA-900 and IRA-958) with different matrices (polystyrene and polyacrylic) were chosen as the supports. SEM and TEM images showed that Pd(0) nanoparticles were evenly attached on the resin surface with a mean size of 3-5 nm...
April 26, 2017: Water Research
https://www.readbyqxmd.com/read/28494132/issue-information-toc
#15
(no author information available yet)
No abstract text is available yet for this article.
June 2017: American Journal on Addictions
https://www.readbyqxmd.com/read/28488705/ni-co-ti-layered-double-hydroxide-for-highly-efficient-photocatalytic-degradation-of-rhodamine-b-and-acid-red-g-a-comparative-study
#16
Priyadarshi Roy Chowdhury, Krishna G Bhattacharyya
Optically responsive, luminescent Ni/Co/Ti layered double hydroxide (LDH), synthesized by a single step hydrothermal route, exhibits highly efficient photodegradation of cationic and anionic dyes, Rhodamine B (∼99.8%) and Acid Red G (∼99.6%) respectively, better than that of commercial catalysts like NiO, CoO and TiO2. The LDH has been characterized by using XRD, XPS, PL, TRES, EIS, TEM, SEM-EDX, AFM, UV-visible DRS, N2-sorption desorption, ξ-potential, FT-IR and TG techniques. The characterized results indicate that the LDH possesses hexagonal morphology, a high surface area, a narrow band gap, defect states and oxygen vacancies within its layered framework...
May 10, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28477253/advanced-oxidation-of-commercial-herbicides-mixture-experimental-design-and-phytotoxicity-evaluation
#17
Alejandro López, Andrea Coll, Maia Lescano, Cristina Zalazar
In this work, the suitability of the UV/H2O2 process for commercial herbicides mixture degradation was studied. Glyphosate, the herbicide most widely used in the world, was mixed with other herbicides that have residual activity as 2,4-D and atrazine. Modeling of the process response related to specific operating conditions like initial pH and initial H2O2 to total organic carbon molar ratio was assessed by the response surface methodology (RSM). Results have shown that second-order polynomial regression model could well describe and predict the system behavior within the tested experimental region...
May 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28460327/decolorization-of-reactive-dyes-in-solar-pond-reactors-perspectives-and-challenges-for-the-textile-industry
#18
L C Chavaco, C A Arcos, D Prato-Garcia
In the past three decades, Fenton and photo-Fenton processes have been the subject of a large number of research studies aimed at developing a low-cost and robust alternative to treat complex wastewater. Aspects such as installation and operating costs and technical complexity of reactors have limited the commercial applications of Fenton processes. In this study, we evaluated the potential of solar pond reactors to carry out degradation of the dye reactive orange 16 (RO16). Decolorization (D = 99 ± 0...
April 28, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28457556/source-apportionment-of-sediment-organic-material-in-a-semi-enclosed-sea-using-bayesian-isotopic-mixing-model
#19
Jing Yu, Hua Zhang
To determine sources of organic material in semi-enclosed Bohai Sea, samples of marine surface sediments, suspended particulates in adjacent rivers and atmospheric deposition were collected and analyzed for grain size composition, total organic carbon(TOC and POC), total nitrogen (TN and PN), and stable isotopic composition (δ(13)C and δ(15)N). Measured bulk C/N ratio (5.50-12.28), δ(13)C (-23.59~-19.54‰), and δ(15)N (2.80-8.07‰) values of surface sediment organic materials indicated a mixed source of marine and terrestrial contributions...
April 27, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28456917/macroinvertebrate-community-in-relation-to-water-quality-and-riparian-land-use-in-a-substropical-mountain-stream-china
#20
Xingzhong Wang, Xiang Tan
Exploring how water quality and land use shape the benthic macroinvertebrate community composition is of widespread interest in biodiversity conservation and environmental management. In this study, we investigated the structures of benthic macroinvertebrate assemblages and their environmental controls in terms of water quality and riparian land use in the Jinshui River, China. We carried out three campaigns including wet season (August 2009), dry season (November 2009), and normal season (April 2010) based on the hydrological regime in Jinshui basin...
April 29, 2017: Environmental Science and Pollution Research International
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