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https://www.readbyqxmd.com/read/29457346/dual-hole-excitons-activated-photoelectrolysis-in-neutral-solution
#1
Sung-Fu Hung, Zhi-Zhong Chen, Chun-Chih Chang, Chia-Shuo Hsu, Ming-Kang Tsai, Chia-Cheng Kang, Hao Ming Chen
II-VI semiconductors exhibit unique behaviors that can generate dual-holes ("heavy and light"), but the application in photocatalysis is still missing. Herein, an empirical utilization of light/heavy holes in a hybrid metal cluster-2D semiconductor nanoplatelets is reported. This hybrid material can boost the hole-transfer at the surface and suppress the recombination. Different roles are enacted by light-holes and heavy-holes, in which the light-holes with higher energy and mobility can facilitate the slow kinetics of water oxidation and further reduce the onset voltage, while the massive heavy-holes can increase the resulting photocurrent by about five times, achieving a photocurrent of 2 mA cm-2 at 1...
February 19, 2018: Small
https://www.readbyqxmd.com/read/29455915/fatty-acid-composition-enzyme-activities-and-metallothioneins-in-donax-trunculus-mollusca-bivalvia-from-polluted-and-reference-sites-in-the-gulf-of-annaba-algeria-pattern-of-recovery-during-transplantation
#2
Amina Rabei, Aziz Hichami, Hayet Beldi, Sandrine Bellenger, Naim Akhtar Khan, Noureddine Soltani
The gulf of Annaba, the most important touristic and economic coastal zone located in Northeast Algeria, is contaminated by several pollutants from urban, agricultural, harbor and industrial activities. Elevated levels of heavy metals were detected in a locally prevalent edible mollusk Donax trunculus (Bivalvia, Donacidae) widely used as a sentinel species for the assessment of marine pollution. The present work aims to measure the difference between two localities, one being full of different pollutants (Sidi Salem) and the other being relatively clean (El Battah) and to evaluate the ability of D...
February 15, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29455525/graphene-oxide-decorated-with-cerium-iv-oxide-in-determination-of-ultra-trace-metal-ions-and-speciation-of-selenium
#3
Anna Baranik, Rafal Sitko, Anna Gagor, Ignasi Queralt, Eva Margui, Beata Zawisza
Graphene oxide decorated with cerium (IV) oxide (GO/CeO2) was synthesized and applied in adsorption of several metal ions such as As(III), As(V), Se(IV), Cu(II) and Pb(II) from aqueous samples. The important feature of GO/CeO2 nanocomposite is also its selectivity towards selenite in the presence of selenate. The structure of GO/CeO2 has been proven by microscopic and spectroscopic techniques. The maximum adsorption capacities of GO/CeO2 calculated by Langmuir model towards arsenic, selenium, copper and lead ions are between 6 and 30 mg g-1...
February 18, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29455259/influence-of-zn-ii-stress-induction-on-component-variation-and-sorption-performance-of-extracellular-polymeric-substances-eps-from-bacillus-vallismortis
#4
Peifei Ding, Weifeng Song, Ziheng Yang, Jingyi Jian
Bacillus vallismortis (B. vallismortis), an aerobic heterotrophic bacteria, was screened in a laboratory pilot study, to assess the interaction between the heavy metal Zn(II) and extracellular polymeric substances (EPS). The influence of Zn(II) stress on EPS production, component variation, and sorption performance, was investigated. The characteristics of B. vallismortis EPS formed under stress were analyzed using FTIR, 3D-EEM and XPS. EPS was used as an adsorbent and the adsorption capacity and adsorption behavior of EPS formed with and without Zn(II) stress, were compared and assessed...
February 17, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29455151/nutrient-management-via-struvite-precipitation-and-recovery-from-various-agroindustrial-wastewaters-process-feasibility-and-struvite-quality
#5
Raffaele Taddeo, Mari Honkanen, Kari Kolppo, Raghida Lepistö
Improving environmental protection and finding sustainable and renewable resources of nutrients are core issues in circular bioeconomy. Thus, this study evaluated the efficiency of recovering struvite, MgNH4 PO4 ·6H2 O, from different agro-industrial wastewaters (four highly loaded reject waters of anaerobically co-digested agro-industrial waste and a raw swine slurry) and assessed the quality of recovered struvite crystals and their reusability as fertilizer. The efficiency of crystallization (Ec 40-80%) and amount of struvite in the precipitate (Pp 55-94%) highly varied due to the characteristics of influent wastewaters, particularly to the content of competing elements, such as alkaline and heavy metals and total solids (TS)...
February 15, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29455145/heavy-metals-dispersion-during-thermal-treatment-of-plastic-bags-and-its-recovery
#6
Ohidul Alam, Sijia Wang, Wentao Lu
One of the main worries for thermal treatment of plastic bag (PB) is the air pollution resulting from heavy metal (HM) evaporation and emission. The quest of the study was to investigate their fate during thermal treatment varying with temperature and atmosphere to explore the appropriate treatment technology. Four commonly consumed polymer bags such as PE, HDPE, LDPE and PVC were selected for the analysis. The elemental compositions, heating values and total metal contents of the samples were measured by an elemental analyzer, a sulphur/halogen analyzer, a bomb calorimeter and an ICP-OES, respectively...
February 14, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29454988/effect-of-bacillus-subtilis-and-nta-apg-on-pyrene-dissipation-in-phytoremediation-of-nickel-co-contaminated-wetlands-by-scirpus-triqueter
#7
Xiaoyan Liu, Xiaoxin Hu, Xinying Zhang, Xueping Chen, Jing Chen, Xiaoyu Yuan
A complex mix of organic pollutants and heavy metal made the remediation of contaminated wetlands more difficult. Few research focus on the remediation for pyrene enhanced by chemical reagents and pyrene degrading bacteria in the nickel co-contaminated soil. In this paper, the effect of chemical reagents (nitrilotriacetic acid and alkyl polyglucoside) and Bacillus subtilis on pyrene dissipation in phytoremediation of nickel co-contaminated soil by Scirpus triqueter was investigated. Similar seedlings of Scirpus triqueter were moved to uncontaminated soil and pyrene-nickel co-contaminated soil...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29454987/nature-differences-of-humic-acids-fractions-induced-by-extracted-sequence-as-explanatory-factors-for-binding-characteristics-of-heavy-metals
#8
Wenjing Shi, Changwei Lü, Jiang He, He En, Manshu Gao, Boyi Zhao, Bin Zhou, Haijun Zhou, Hualin Liu, Yu Zhang
The composition and structure of Humic acid (HA) is so heterogeneous that it brings significant barriers to investigate the interaction between HA and heavy metal ions. The isolation of HA with relatively homogeneity is a key to reveal the binding mechanisms between HA and heavy metals. In this work, ten HA fractions (HAs) were obtained by sequential alkali extraction procedure and nature differences of the extracted HAs were considered as explanatory factors for binding characteristics of Cu2+ , Pb2+ and Cd2+ ...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29454971/overexpression-of-ptabcc1-contributes-to-mercury-tolerance-and-accumulation-in-arabidopsis-and-poplar
#9
Liping Sun, Yifeng Ma, Huihong Wang, Weipeng Huang, Xiaozhu Wang, Li Han, Wanmei Sun, Erqin Han, Bangjun Wang
Mercury (Hg) is a highly biotoxic heavy metal that contaminates the environment. Phytoremediation is a green technology for environmental remediation and is used to clean up Hg contaminated soil in recent years. In this study, we isolated an ATP-binding cassette (ABC) transporter gene PtABCC1 from Populus trichocarpa and overexpressed it in Arabidopsis and poplar. The transgenic plants conferred higher Hg tolerance than wild type (WT) plants, and overexpression of PtABCC1 could lead to 26-72% or 7-160% increase of Hg accumulation in Arabidopsis or poplar plants, respectively...
February 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29454832/identification-and-functional-analysis-of-inhibitor-of-nf-%C3%AE%C2%BAb-kinase-ikk-from-scylla-paramamosain-the-first-evidence-of-three-ikks-in-crab-species-and-their-expression-profiles-under-biotic-and-abiotic-stresses
#10
Mei Jiang, Dan-Dan Tu, Wen-Bin Gu, Yi-Lian Zhou, Qi-Hui Zhu, Xiao-Ling Guo, Miao-An Shu
IKK (inhibitor of NF-κB kinase) is the core regulator for NF-κB (nuclear factor-κB) pathway against pathogenic invasion in vertebrates or invertebrates. However, the IKK from crab species has not yet been identified. In the present study, three full-length cDNA sequences of IKKs from mud crab Scylla paramamosain, designated as SpIKKβ, SpIKKε1 and SpIKKε2, were firstly cloned through RT-PCR and RACE methods. This is also the first report about the identification of two IKKε genes in mud crab and even in crustaceans...
February 15, 2018: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29454271/the-complexation-of-rhizosphere-and-nonrhizosphere-soil-organic-matter-with-chromium-using-elemental-analysis-combined-with-ftir-spectroscopy
#11
Jiajun Wen, Zhongwu Li, Bin Huang, Ninglin Luo, Mei Huang, Ren Yang, Qiu Zhang, Xiuqing Zhai, Guangming Zeng
Complexation is a main mechanism controlling the reactions between soil organic matter (SOM) and heavy metals, which still have not been fully understood up to date. The objective of this study was to compare the SOM composition of nonrhizosphere and rhizosphere in low Cr treatment with that in high Cr treatment and to find out how metal concentrations affect the complexation with SOM. The results revealed that both the hydroxyl and the carboxyl were significantly different under different Cr treatment groups...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29454247/tolerance-and-growth-kinetics-of-bacteria-isolated-from-gold-and-gemstone-mining-sites-in-response-to-heavy-metal-concentrations
#12
Oluwatosin Gbemisola Oladipo, Obinna Tobechukwu Ezeokoli, Mark Steve Maboeta, Jacobus Johannes Bezuidenhout, Louwrens R Tiedt, Anine Jordaan, Cornelius Carlos Bezuidenhout
Response and growth kinetics of microbes in contaminated medium are useful indices for the screening and selection of tolerant species for eco-friendly bio-augmentative remediation of polluted environments. In this study, the heavy metal (HM) tolerance, bioaccumulation and growth kinetics of seven bacterial strains isolated from mining sites to 10 HMs (Cd, Hg, Ni, Al, Cr, Pb, Cu, Fe, Mn and Zn) at varied concentrations (25-600 mgL -1 ) were investigated. The isolates were phylogenetically (16S rRNA gene) related to Lysinibacillus macroides, Achromobacter spanius, Bacillus kochii, B...
February 14, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29454233/combined-effect-of-water-inundation-and-heavy-metals-on-the-photosynthesis-and-physiology-of-spartina-alterniflora
#13
Xiangli Sun, Yan Xu, Qiqiong Zhang, Xiuzhen Li, Zhongzheng Yan
The frequency and duration of tidal flooding significantly influence the bioavailability of heavy metals (HMs) in sediment and hence exert toxicological effects on coastal wetland plants. In this study, the combined effects of different water inundation times (3, 6, 9, and 12 h) and HMs (Cu, Zn, Pb, and Cr) on the photosynthesis and physiology of Spartina alterniflora were investigated under greenhouse conditions. Results showed that S. alterniflora was somehow tolerant to the combined HMs treatments, and only the highest level of HM treatment decreased leaf chlorophyll content...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29454170/enhanced-electrokinetic-remediation-of-polluted-soils-by-anolyte-ph-conditioning
#14
R López Vizcaíno, A Yustres, L Asensio, C Saez, P Cañizares, M A Rodrigo, V Navarro
In the treatment of a polluted soil, the pH has a strong impact on the development of different physicochemical processes as precipitation/dissolution, adsorption/desorption or ionic exchange. In addition, the pH determines the chemical speciation of the compounds present in the system and, consequently, it conditions the transport processes by which those compounds will move. This question has aroused great interest in the development of pH control technologies coupled to soil remediation processes. In electrokinetic remediation processes, pH has usually been controlled by catholyte pH conditioning with acid solutions, applied to cases of heavy metals pollution...
February 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29453723/macroelements-and-heavy-metals-content-in-energy-crops-cultivated-on-contaminated-soil-under-different-fertilization-case-studies-on-autumn-harvest
#15
Marta Pogrzeba, Szymon Rusinowski, Jacek Krzyżak
Heavy metals (HMs) contamination of soils is a major problem occurring worldwide. Utility of energy crops for biofuel feedstock production systems offers a feasible solution for a commercial exploitation of an arable land contaminated with HMs. Experiments involved field testing of Miscanthus x giganteus and Spartina pectinata cultivated on HMs-contaminated soil with standard NPK fertilizers and commercially available microbial inoculum. Biomass yield, water content, macronutrients (N, P, K, Mg, Ca), and heavy metal (Cd, Pb, Zn) concentrations in plant shoots were assessed at the end of the first and the second growing season...
February 16, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29453715/the-influence-of-heavy-metals-polyaromatic-hydrocarbons-and-polychlorinated-biphenyls-pollution-on-the-development-of-antibiotic-resistance-in-soils
#16
Andrey Vladimirovich Gorovtsov, Ivan Sergeevich Sazykin, Marina Alexandrovna Sazykina
The minireview is devoted to the analysis of the influence of soil pollution with heavy metals, polyaromatic hydrocarbons (PAHs), and the polychlorinated biphenyls (PCBs) on the distribution of antibiotics resistance genes (ARGs) in soil microbiomes. It is shown that the best understanding of ARGs distribution process requires studying the influence of pollutants on this process in natural microbiocenoses. Heavy metals promote co-selection of genes determining resistance to them together with ARGs in the same mobile elements of a bacterial genome, but the majority of studies focus on agricultural soils enriched with ARGs originating from manure...
February 16, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29453252/ecology-and-biotechnological-potential-of-bacteria-belonging-to-the-pseudovibrio-genus
#17
Stefano Romano
Bacteria belonging to the genus Pseudovibrio have been isolated worldwide from a great variety of marines sources as both free living and host associated. So far, the available data depict a group of Alphaproteobacteria characterized by a versatile metabolism, which allows them to use a variety of substrates to meet their carbon, nitrogen, sulfur, and phosphorous requirements. Additionally, Pseudovibrio -related bacteria have been shown to proliferate under extreme oligotrophic conditions, tolerate high heavy metal concentrations, and metabolize potentially toxic compounds...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29453160/dna-damage-and-micronuclei-in-parthenogenetic-and-bisexual-darevskia-rock-lizards-from-the-areas-with-different-levels-of-soil-pollution
#18
Anna Simonyan, Galina Hovhannisyan, Anzhela Sargsyan, Marine Arakelyan, Seyran Minasyan, Rouben Aroutiounian
Natural species are widely used as indicator organisms to estimate of the impact of environmental pollution. Here we present the results of first study of a reliability of parthenogenetic Darevskia аrmeniaca and bisexual Darevskia raddei rock lizards as sentinels for monitoring of environmental genotoxicity. The comet assay and micronucleus test were applied to the lizards sampled in six areas in Armenia and Artsakh with different levels of soil contamination. The results obtained showed a clear relationship between the pollution level of lizards' habitats and the frequency of DNA damage in the comet assay...
February 13, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29453070/magnetic-zr-mofs-nanocomposites-for-rapid-removal-of-heavy-metal-ions-and-dyes-from-water
#19
Lijin Huang, Man He, Beibei Chen, Bin Hu
Amino-decorated Zr-based magnetic Metal-Organic Frameworks composites (Zr-MFCs) were prepared by a facile and efficient strategy. The nano-sized Fe3 O4 @SiO2 core (about 15 nm) was coated with a shell of Zr-MOFs (about 5 nm) by means of in-situ growth. And, Fe3 O4 @SiO2 @UiO-66 and its amino derivatives (Fe3 O4 @SiO2 @UiO-66-NH2 and Fe3 O4 @SiO2 @UiO-66-Urea) were successfully prepared by using different precursors. The obtained Zr-MFCs were demonstrated to be efficient adsorbents for metal ions/organic dyes removal from aqueous solution, with high adsorption capacity and fast adsorption kinetics...
February 7, 2018: Chemosphere
https://www.readbyqxmd.com/read/29453062/heavy-metal-accumulation-risk-assessment-and-integrated-biomarker-responses-of-local-vegetables-a-case-study-along-the-le-an-river
#20
Yong Ji, Peijun Wu, Jie Zhang, Jun Zhang, Youfeng Zhou, Yongwen Peng, Shifeng Zhang, Gaotang Cai, Guiqing Gao
In this research, Ganzhou Chinese Cabbage (Brassica rapa pekinensis), Native Purple Garlic (Allium sativum L) and Leping Radish (Raphanus sativus L) widely planted and distributed along the Le'an River were chosen in the present study. Soil physical-chemical properties, nutrients contents as well as heavy metals elements accumulated in both soils and vegetables collected from 24 sites were analyzed by lab analysis combined with statistical method which was also used for calculation of contamination factor, pollution indexes and hazardous index...
February 8, 2018: Chemosphere
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