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https://www.readbyqxmd.com/read/28938216/efficient-removal-of-priority-hazardous-priority-and-emerging-pollutants-with-prunus-armeniaca-functionalized-biochar-from-aqueous-wastes-experimental-optimization-and-modeling
#1
Maja Turk Sekulić, Sabolč Pap, Zoran Stojanović, Nikola Bošković, Jelena Radonić, Tatjana Šolević Knudsen
This paper investigates the ability of the phosphoric acid functionalized Prunus armeniaca stones biochar (AsPhA) prepared by thermochemical activation to remove lead (Pb(2+)), cadmium (Cd(2+)), nickel (Ni(2+)), naproxen and chlorophenols from aqueous wastes. The engineered biochar was characterized using the Scanning Electron Microscopy, Energy-dispersive X-ray Spectroscopy, Fourier Transform Infrared Spectroscopy and Brunauer, Emmett and Teller technique. The batch studies were performed by varying the initial pH of the solution (2-9), adsorbent dosage (0...
September 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28929369/air-quality-study-in-the-coastal-city-of-crotone-southern-italy-hosting-a-small-size-harbor
#2
Paola Romagnoli, Francesca Vichi, Catia Balducci, Andrea Imperiali, Mattia Perilli, Lucia Paciucci, Francesco Petracchini, Angelo Cecinato
Particulate polycyclic aromatic hydrocarbons (PAHs), n-alkanes, and gaseous pollutants were collected from the harbor and the urban area of Crotone (Southern Italy) in October 2015. The atmospheric concentrations of organic substances associated to PM10 were determined daily, while gaseous pollutants (BTEX, O3, SO2, NOx, NO2, and NH3) were monitored on monthly basis by means of diffusive sampling. Total PAHs reached, on the average, 1.56 ± 0.72, 0.33 ± 0.14, and 0.59 ± 0.37 ng/m(3) at the urban monitoring stations (Fiore, Fermi) and at the harbor, respectively...
September 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28921162/a-bionanohybrid-znal-nads-ecological-pesticide-as-a-treatment-for-soft-rot-disease-in-potato-solanum-tuberosum-l
#3
Erika Elizabeth Morales-Irigoyen, Yolanda de Las Mercedes Gómez-Y-Gómez, Jorge Luis Flores-Moreno, Marina Olivia Franco-Hernández
Pectobacterium carotovorum (Pc) is a phytopathogenic strain that causes soft rot disease in potato (Solanum tuberosum L.), resulting in postharvest losses. Chemical control is effective for managing this disease, but overdoses cause adverse effects. Because farmers insist on using chemical agents for crop protection, it is necessary to develop more effective pesticides in which the active compound released can be regulated. In this context, we proposed the synthesis of ZnAl-NADS, in which nalidixic acid sodium salt (NADS) is linked to a ZnAl-NO3 layered double hydroxide (LDH) host as a nanocarrier...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28917180/learning-from-the-operation-pathology-and-maintenance-of-a-bioretention-system-to-optimize-urban-drainage-practices
#4
Marina Batalini de Macedo, Altair Rosa, César Ambrogi Ferreira do Lago, Eduardo Mario Mendiondo, Vladimir Caramori Borges de Souza
LID practices for runoff control are increasingly being used as an integrated solution in urban drainage, helping to achieve hydrological balance close to the pre-urbanized period and decrease the diffuse pollution transported to urban rivers. Regarding bioretention, there is already broad knowledge about the detention of peak flows and their treatment capacity for many pollutants. However, there are still few field studies in microdrainage scale, which analyze the actual operation of these devices and raise common problems found, especially in subtropical climate...
September 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28916817/micro-and-nano-hierachical-structures-of-bioi-activated-carbon-for-efficient-visible-light-photocatalytic-reactions
#5
Jianhua Hou, Kun Jiang, Ming Shen, Rui Wei, Xiaoge Wu, Faryal Idrees, Chuanbao Cao
Constructing the heterojunctions or designing the novel nanostructures are thought as effective methods to improve photocatalytic activities of semiconductors. Herein, a one-step green route was developed to fabricate bismuth oxyiodide/activated carbon (BiOI/C) composite. The prepared BiOI/C exhibit obviously red shifts and increased absorption range of visible light. The presence of Bi-C bonds confirms the heterojunction, on account of which the BiOI nanosheets tightly grew on the surface of carbon and subsequently provided the hierarchical structure, sufficient interfacial interaction and high specific surface area...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916038/a-tri-metal-centered-metal-organic-framework-for-solid-phase-microextraction-of-environmental-contaminants-with-enhanced-extraction-efficiency
#6
Shuqin Liu, Lijun Xie, Qingkun Hu, Huangsheng Yang, Guanrui Pan, Fang Zhu, Shenghong Yang, Gangfeng Ouyang
This study presents the preparation and the characterizations of six tri-metal centered metal-organic frameworks (tM-MOFs) as solid-phase microextraction (SPME) adsorbents. Possessing different proportions of Al, Ga and In atoms in their frameworks, the tM-MOF-based SPME coatings exhibited different extraction performance towards the organic pollutants. Extraction results showed that the M4 (Al0.593Ga0.167In0.240(O2C2H4)(h2fipbb)) coating exhibited the best enrichment ability among six tM-MOFs. In addition, it showed better extraction efficiency towards the analytes than three single-metal centered MOFs coatings and a commercial polydimethylsiloxane (PDMS) coating...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28911271/chitosan-modification-persimmon-tannin-bioadsorbent-for-highly-efficiency-removal-of-pb-ii-from-aqueous-environment-the-adsorption-equilibrium-kinetics-and-thermodynamics
#7
Xiaojuan Li, Zhongmin Wang, Haijun Liang, Jingliang Ning, Guiyin Li, Zhide Zhou
Lead (Pb) pollution has triggered a great threat to ecological system as well as public health due to its highly toxic and mutagenic properties. In this study, chitosan surface modified persimmon tannin (PT-CS) biomass composite as an environmental friendly bioadsorbent for highly efficient removal of Pb(II) from aqueous solutions was investigated. FT-IR, XRD, SEM, BET, XPS and Zeta potential were used to elucidate the adsorption mechanism. Combining of oxidation reaction, electrostatic interaction and chelation reaction, PT-CS exhibited fine adsorption performance to Pb(II)...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28910732/degradation-of-toxic-pahs-in-water-and-soil-using-potassium-zinc-hexacyanoferrate-nanocubes
#8
Uma Shanker, Vidhisha Jassal, Manviri Rani
Polycyclic aromatic hydrocarbons (PAHs) the ubiquitous, persistent and carcinogenic environmental contaminants have raised concern worldwide. Recently, their removal methodologies are advanced after exploring nanomaterials. Therefore, degradation of selected toxic PAHs (3-5 rings) using potassium zinc hexacyanoferrate (KZnHCF) nanocubes was studied. Highly crystalline and sharp KZnHCF nanocubes (∼100 nm) were obtained by green route using sapindus mukorossi. In both water and soil, anthracene and phenanthrene were degraded to maximum extent (80-93%), whereas, the degradation of fluorene, chrysene and benzo (a) pyrene were ∼70-80%...
September 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28903174/greenhouse-gases-emission-from-the-sewage-draining-rivers
#9
Beibei Hu, Dongqi Wang, Jun Zhou, Weiqing Meng, Chongwei Li, Zongbin Sun, Xin Guo, Zhongliang Wang
Carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) concentration, saturation and fluxes in rivers (Beitang drainage river, Dagu drainage rive, Duliujianhe river, Yongdingxinhe river and Nanyunhe river) of Tianjin city (Haihe watershed) were investigated during July and October in 2014, and January and April in 2015 by static headspace gas chromatography method and the two-layer model of diffusive gas exchange. The influence of environmental variables on greenhouse gases (GHGs) concentration under the disturbance of anthropogenic activities was discussed by Spearman correlative analysis and multiple stepwise regression analysis...
September 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28901132/regioselectivity-of-the-oh-radical-addition-to-uracil-in-nucleic-acids-a-theoretical-approach-based-on-qm-mm-simulations
#10
Juan Aranda, Antonio Francés-Monerris, Iñaki Tuñón, Daniel Roca-Sanjuán
Oxidation of nucleic acids are ubiquitous in living beings under metabolic impairments and/or exposed to external agents such as radiation, pollutants, or drugs, playing a central role in the development of many diseases mediated by DNA/RNA degeneration. Great efforts have been devoted to unveil the molecular mechanisms behind the OH radical additions to the double bonds of nucleobases, however, the specific role of the biological environment remains rela-tively unexplored. The present contribution tackles the study of the OH radical addition to uracil from the gas phase to a full RNA macromolecule by means of quantum-chemistry methods combined with molecular dynamics simulations...
September 13, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28891010/effect-of-hydrophobicity-of-pharmaceuticals-and-personal-care-products-for-adsorption-on-activated-carbon-adsorption-isotherms-kinetics-and-mechanism
#11
Harkirat Kaur, Amit Bansiwal, Girivyankatesh Hippargi, Girish R Pophali
Adsorption of three pharmaceuticals and personal care products (PPCPs), namely caffeine, ibuprofen and triclosan on commercial powdered activated carbon was examined in aqueous medium. The contaminants were chosen based on their diverse log Kow (octanol-water partition coefficient) viz. - 0.07 for caffeine, 3.97 for ibuprofen and 4.76 for triclosan to examine the role of hydrophobicity on adsorption process. The adsorbent characterisation was achieved using BET surface area, SEM, pore size distribution studies and FTIR...
September 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28886914/mapping-eutrophication-risk-from-climate-change-future-phosphorus-concentrations-in-english-rivers
#12
Matthew B Charlton, Michael J Bowes, Michael G Hutchins, Harriet G Orr, Rob Soley, Paul Davison
Climate change is expected to increase eutrophication risk in rivers yet few studies identify the timescale or spatial extent of such impacts. Phosphorus concentration, considered the primary driver of eutrophication risk in English rivers, may increase through reduced dilution particularly if river flows are lower in summer. Detailed models can indicate change in catchment phosphorus concentrations but targeted support for mitigation measures requires a national scale evaluation of risk. In this study, a load apportionment model is used to describe the current relationship between flow and total reactive phosphorus (TRP) at 115 river sites across England...
September 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28882389/pore-scale-simulations-of-concentration-tails-in-heterogeneous-porous-media
#13
Paolo Roberto Di Palma, Andrea Parmigiani, Christian Huber, Nicolas Guyennon, Paolo Viotti
The retention of contaminants in the finest and less-conductive regions of natural aquifer is known to strongly affect the decontamination of polluted aquifers. In fact, contaminant transfer from low to high mobility regions at the back end of a contaminant plume (i.e. back diffusion) is responsible for the long-term release of contaminants during remediation operation. In this paper, we perform pore-scale calculations for the transport of contaminant through heterogeneous porous media composed of low and high mobility regions with two objectives: (i) study the effect of permeability contrast and solute transport conditions on the exchange of solutes between mobile and immobile regions and (ii) estimate the mass of contaminants sequestered in low mobility regions based on concentration breakthrough curves...
August 8, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28881213/trends-in-riverine-element-fluxes-a-chronicle-of-regional-socio-economic-changes
#14
Jiří Kopáček, Josef Hejzlar, Petr Porcal, Maximilian Posch
We show how concentrations of water solutes in the Vltava River (Czech Republic) and their riverine outputs from the catchment were modified by socio-economic changes, land use, and hydrology between 1960 and 2015. In the early 1960s, HCO3 and Ca were the dominant ions. During 1960-1989 (a period of planned economy with an over-use of synthetic fertilizers, excessive draining of agricultural land and little environmental protection), the riverine concentrations of strong acid anions (SAAs: SO4, NO3, and Cl) increased 2-4-fold and their leaching was accompanied for by a 1...
August 30, 2017: Water Research
https://www.readbyqxmd.com/read/28871335/biodegradation-of-gaseous-toluene-with-mixed-microbial-consortium-in-a-biofilter-steady-state-and-transient-operation
#15
Ravi Rajamanickam, Divya Baskaran
Petroleum oil refineries are massive emitters of risky volatile organic compounds (VOCs). Among the VOCs, toluene is taken into account as a significant pollutant. In the present study, a compost biofilter is used to treat the toluene vapor. However, an elimination capacity and removal efficiency of the biofilter was investigated for a wide range of toluene concentrations (0.29-3.8 g m(-3)) and operated for 54 days effectively. Elimination capacity of 93 g m(-3) h(-1) was recorded as maximum value at a toluene inlet concentration of 114 g m(-3) h(-1)...
September 4, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28855653/a-valuable-biochar-from-poplar-catkins-with-high-adsorption-capacity-for-both-organic-pollutants-and-inorganic-heavy-metal-ions
#16
Xia Liu, Ju Sun, Shengxia Duan, Yanan Wang, Tasawar Hayat, Ahmed Alsaedi, Chengming Wang, Jiaxing Li
In this paper, biochar derived from poplar catkins was used as an economical and renewable adsorbent for adsorption organic and inorganic pollutants such as, dyes, organic compounds, and heavy metal ions from wastewater. Mesoporous activated carbonized poplar catkins (ACPCs) were produced from char as a by-product by carbonized poplar catkins (CPCs). With their high surface area, ACPCs exhibited the maximum adsorption capacities of 71.85 and 110.17 mg/g for the removal of inorganic U(VI) and Co(II). Compared other biochars adsorbents, ACPCs can also adsorb organic pollutants with the maximum adsorption capacities of 534, 154, 350, 148 and 384 mg/g for methylene blue (MB), methyl orange (MO), Congo red (CR), chloramphenicol (CAP) and naphthalene...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28843417/evaluation-of-primitive-ground-water-supplies-as-a-risk-factor-for-the-development-of-major-waterborne-zoonosis-in-egyptian-children-living-in-rural-areas
#17
Hassan A Elfadaly, Nawal A Hassanain, Mohey A Hassanain, Ashraf M Barakat, Raafat M Shaapan
BACKGROUND: Endemic waterborne zoonosis frequently occurs in both developed and less developed countries. Thus, bio-surveillance of waterborne zoonosis is a "necessity" for the implementation of effective preventive public health measures in Egyptian rural areas. The primitive individual water supplies created by the rural agriculture population, primarily from ground water, usually maximize the customers' exposure to impurity pathogens via diffused humans and animal excreta or wastages...
August 23, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28819905/adsorption-properties-of-kaolinite-based-nanocomposites-for-fe-and-mn-pollutants-from-aqueous-solutions-and-raw-ground-water-kinetics-and-equilibrium-studies
#18
Mohamed Shaban, Mohamed E M Hassouna, Fadya M Nasief, Mostafa R AbuKhadra
Raw kaolinite was used in the synthesis of metakaolinite/carbon nanotubes (K/CNTs) and kaolinite/starch (K/starch) nanocomposites. Raw kaolinite and the synthetic composites were characterized using XRD, SEM, and TEM techniques. The synthetic composites were used as adsorbents for Fe and Mn ions from aqueous solutions and natural underground water. The adsorption by the both composites is highly pH dependent and achieves high efficiency within the neutral pH range. The experimental adsorption data for the uptake of Fe and Mn ions by K/CNTs were found to be well represented by the pseudo-second-order kinetic model rather than the intra-particle diffusion model or Elovich model...
August 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28819141/constructing-the-novel-ultrafine-amorphous-iron-oxyhydroxide-g-c3n4-nanosheets-heterojunctions-for-highly-improved-photocatalytic-performance
#19
Hongcen Yang, Shouwei Zhang, Ruya Cao, Xiaolong Deng, Zhipeng Li, Xijin Xu
Ultrafine particles, more heterojunction interfaces and amorphous materials can effectively enhance the photocatalytic activity of photocatalysts. In this work, a facile in-situ precipitation method was developed to prepare ultrafine amorphous iron oxyhydroxide/ultrathin g-C3N4 nanosheets heterojunction composites. The amorphous iron oxyhydroxide possessed an ultrafine particle size and a wide range of visible light absorption. In this process, the ultrafine particles not only shortened the diffusion distance of photogenerated carriers, but also facilitated the formation of more heterojunctions with ultrathin g-C3N4 nanosheets...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810226/rapid-removal-of-organic-pollutants-by-activation-sulfite-with-ferrate
#20
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(-)...
November 2017: Chemosphere
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