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https://www.readbyqxmd.com/read/28934645/graphene-a-new-activator-of-sodium-persulfate-for-the-advanced-oxidation-of-parabens-in-water
#1
Leonidas Bekris, Zacharias Frontistis, George Trakakis, Lamprini Sygellou, Costas Galiotis, Dionissios Mantzavinos
Graphene was successfully employed as a catalyst for the activation of sodium persulfate, towards the effective degradation of propylparaben, an emerging micro-pollutant, representative of the parabens family. A novel process is proposed which utilizes a commercial graphene nano-powder as the catalyst and sodium persulfate as the oxidizing agent. It was found that over 95% of micro-pollutant degradation occurs within 15 min of reaction time. The effects of catalyst loading (75 mg/L to 1 g/L), sodium persulfate (SPS) concentration (10 mg/L to 1 g/L), initial solution pH (3-9) and initial paraben concentration (0...
September 13, 2017: Water Research
https://www.readbyqxmd.com/read/28934546/oxygen-vacancy-promoted-heterogeneous-fenton-like-degradation-of-ofloxacin-at-ph-3-2-9-0-by-cu-substituted-magnetic-fe3o4-feooh-nanocomposite
#2
Hang Jin, Xike Tian, Yulun Nie, Zhaoxin Zhou, Chao Yang, Yong Li, Liqiang Lu
To develop an ultra-efficient and reusable heterogeneous Fenton-like catalyst at a wide working pH range is a great challenge for its application in practical water treatment. We report an oxygen vacancy promoted heterogeneous Fenton-like reaction mechanism and an unprecedented ofloxacin (OFX) degradation efficiency of Cu doped Fe3O4@FeOOH magnetic nanocomposite. Without the aid of external energy, OFX was always completely removed within 30 min at pH 3.2-9.0. Compared with Fe3O4@FeOOH, the pseudo-first-order reaction constant was enhanced by 10 times due to Cu substitution (9...
September 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28934270/assessment-of-the-trophic-state-of-a-hypersaline-carbonatic-environment-vermelha-lagoon-brazil
#3
Lazaro Laut, Maria Virginia Alves Martins, Fabrizio Frontalini, João M Ballalai, Pierre Belart, Renan Habib, Luiz F Fontana, Iara M M M Clemente, Maria Lucia Lorini, João G Mendonça Filho, Vanessa M Laut, Marcos de Souza Lima Figueiredo
Vermelha Lagoon is a hypersaline shallow transitional ecosystem in the state of Rio de Janeiro (Brazil). This lagoon is located in the protected area of Massambaba, between the cities of Araruama and Saquarema (Brazil), and displays two quite uncommon particularities: it exhibits carbonate sedimentation and displays the development of Holocene stromatolites. Due to both particularities, the salt industry and property speculation have been, increasingly, generating anthropic pressures on this ecosystem. This study aims to apply a multiproxy approach to evaluate the trophic state of Vermelha Lagoon based on physicochemical parameters and geochemical data for the quantification and qualification of organic matter (OM), namely total organic carbon (TOC), total sulfur (TS), total phosphorus (TP) and biopolymeric carbon (BPC), including carbohydrates (CHO), lipids (LIP) and proteins (PTN)...
2017: PloS One
https://www.readbyqxmd.com/read/28931282/crystallization-and-colloidal-stabilization-of-ca-oh-2-in-the-presence-of-nopal-juice-opuntia-ficus-indica-implications-in-architectural-heritage-conservation
#4
Carlos Rodriguez-Navarro, Encarnacion Ruiz-Agudo, Alejandro Burgos-Cara, Kerstin Elert, Eric F Hansen
Hydrated lime (Ca(OH)2) is a vernacular art and building material produced following slaking of CaO in water. If excess water is used, a slurry, called lime putty forms, which has been the preferred craftsman selection for formulating lime mortars since Roman times. A variety of natural additives were traditionally added to the lime putty to improve its quality. The mucilaginous juice extracted from nopal cladodes has been and still is used as additive incorporated in the slaking water for formulation of lime mortars and plasters both in ancient Mesoamerica as well as in the USA Southwest...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28929139/rapid-and-near-complete-dissolution-of-wood-lignin-at-%C3%A2-80%C3%A2-c-by-a-recyclable-acid-hydrotrope
#5
Liheng Chen, Jinze Dou, Qianli Ma, Ning Li, Ruchun Wu, Huiyang Bian, Daniel J Yelle, Tapani Vuorinen, Shiyu Fu, Xuejun Pan, Junyong J Y Zhu
We report the discovery of the hydrotropic properties of a recyclable aromatic acid, p-toluenesulfonic acid (p-TsOH), for potentially low-cost and efficient fractionation of wood through rapid and near-complete dissolution of lignin. Approximately 90% of poplar wood (NE222) lignin can be dissolved at 80°C in 20 min. Equivalent delignification using known hydrotropes, such as aromatic salts, can be achieved only at 150°C or higher for more than 10 hours or at 150°C for 2 hours with alkaline pulping. p-TsOH fractionated wood into two fractions: (i) a primarily cellulose-rich water-insoluble solid fraction that can be used for the production of high-value building blocks, such as dissolving pulp fibers, lignocellulosic nanomaterials, and/or sugars through subsequent enzymatic hydrolysis; and (ii) a spent acid liquor stream containing mainly dissolved lignin that can be easily precipitated as lignin nanoparticles by diluting the spent acid liquor to below the minimal hydrotrope concentration...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28928391/interaction-between-karst-terrain-and-bauxites-evidence-from-quaternary-orebody-distribution-in-guangxi-sw-china
#6
Lin Yang, Qingfei Wang, Qizuan Zhang, Emmanuel John M Carranza, Huan Liu, Xuefei Liu, Jun Deng
Most bauxite in China is located upon the karst surface, yet the relation between karstification process and bauxite formation is barely known. Here we discuss how the relation affects the karst and bauxite evolution through analyzing distributions of orebody parameters from 9,007 exploration wells (434 orebodies) in western Guangxi, South China block. In high-elevation karst terrain dominated by peaks, orebodies have greater average thickness, lower Al2O3 and higher Fe2O3(T) than those in low-elevation region dominated by depressions...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28925516/co3o4-nanowire-arrays-toward-superior-water-oxidation-electrocatalysis-in-alkaline-media-by-surface-amorphization
#7
Xuping Sun
In this communication, we report our recent finding that the generation of amorphous Co-Bi layer on Co3O4 nanowire arrays supported on Ti mesh (Co3O4@Co-Bi NA/TM) leads to significantly boosted OER activity. The as-prepared Co3O4@Co-Bi NA/TM demands overpotential of 304 mV to drive a ge-ometrical current density of 20 mA cm-2 in 1.0 M KOH, which is 109 mV less than that for Co3O4 NA/TM, with its catalytic activity being preserved for at least 20 h. It suggests that the existence of amorphous Co-Bi layer promotes more CoOx(OH)y generation on Co3O4 surface...
September 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28922634/functionalisation-of-ti6al4v-and-hydroxyapatite-surfaces-with-combined-peptides-based-on-kklpda-and-eeeeeeee-peptides
#8
Gabriela Melo Rodriguez, James Bowen, David Grossin, Besim Ben-Nissan, Artemis Stamboulis
Surface modifications are usually performed on titanium alloys to improve osteo-integration and surface bioactivity. Modifications such as alkaline and acid etching, or coating with bioactive materials such as hydroxyapatite, have previously been demonstrated. The aim of this work is to develop a peptide with combined titanium oxide and hydroxyapatite binders in order to achieve a biomimetic hydroxyapatite coating on titanium surfaces. The technology would also be applicable for the functionalisation of titanium and hydroxyapatite surfaces for selective protein adsorption, conjugation of antimicrobial peptides, and adsorption of specialised drugs for drug delivery...
September 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28922495/formation-of-ni-fe-mixed-diselenide-nanocages-as-a-superior-oxygen-evolution-electrocatalyst
#9
Jianwei Nai, Yan Lu, Le Yu, Xin Wang, Xiong Wen David Lou
Exploring effective electrocatalysts is a crucial requirement for boosting the efficiency of water splitting to obtain clean fuels. Here, a self-templating strategy is reported to synthesize Ni-Fe mixed diselenide cubic nanocages for the electrocatalytic oxygen evolution reaction (OER). The diselenide nanocages are derived from corresponding Prussian-blue analog nanocages, which are first obtained by treating the nanocube precursor with a site-selective ammonia etchant. The resulting Ni-Fe mixed diselenide nanocages perform as a superior OER electrocatalyst, which affords a current density of 10 mA cm(-2) at a small overpotential of 240 mV; a high current density, mass activity, and turnover frequency of 100 mA cm(-2) , 1000 A g(-1) , and 0...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28918378/enhanced-fluoride-removal-by-la-doped-li-al-layered-double-hydroxides
#10
Jianguo Cai, Xin Zhao, Yanyang Zhang, Quanxing Zhang, Bingcai Pan
In this study La intercalated Li/Al layered double hydroxide (LDH) was developed for efficient water defluoridation. The La-modified material, i.e., La doped Li/Al-LDH, exhibits more preferable fluoride adsorption than Li/Al-LDH in a broad pH range of 5-9, with the working capacity twice of the latter and seven times of magnitude higher than activated alumina. The fluoride removal kinetics is well fitted by pseudo-second order model, and the adsorption isotherm is well described by Freundlich model. Effect of pH and competing ions was examined during fluoride sequestration...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918291/distinguished-cr-vi-capture-with-rapid-and-superior-capability-using-polydopamine-microsphere-behavior-and-mechanism
#11
Qingrui Zhang, Yixuan Li, Qinggang Yang, He Chen, Xinqing Chen, Tifeng Jiao, Qiuming Peng
Toxic heavy metal containing Cr(VI) species is a serious threat for ecological environment and human beings. In this work, a new mussel-inspired polydopamine microsphere (PDA-sphere) is prepared through in situ oxidative polymerization at air condition with controllable sizes. The adsorption of Cr(VI) ions onto PDA-sphere is highly pH dependent with the optimal pH ranging from 2.5 to 3.8. A rapid Cr(VI) removal can approach in 8min for equilibrium. More importantly, the prepared materials exhibit a remarkable sorption selectivity, coexisting SO4(2-), NO3(-) and Cl(-) ions at high levels; The applicability model further proves its effective performances with treated capacity of 42,000kg/kg sorbent, and the effluent can be reduced from 2000ppb to below 50ppb, which meets the drinking water criterions recommended by WHO...
August 26, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28917362/a-comparative-study-of-the-antacid-effect-of-some-commonly-consumed-foods-for-hyperacidity-in-an-artificial-stomach-model
#12
Vandana Panda, Priyanka Shinde, Jyoti Deora, Pankaj Gupta
OBJECTIVES: The incorporation of certain alkalinizing vegetables, fruits, milk and its products in the diet has been known to alleviate hyperacidity. These foods help to restore the natural gastric balance and function, curb acid reflux, aid digestion, reduce the burning sensation due to hyperacidity and soothe the inflamed mucosa of the stomach. The present study evaluates and compares the antacid effect of broccoli, kale, radish, cucumber, lemon juice, cold milk and curd in an artificial stomach model...
October 2017: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/28914454/optimization-of-protein-recovery-from-bovine-lung-by-ph-shift-process-using-response-surface-methodology
#13
Sarah A Lynch, Carlos Alvarez, Eileen O'Neill, Derek F Keenan, Anne Maria Mullen
BACKGROUND: Response surface methodology (RSM) was used in a sequential manner to optimize solubilization and precipitation conditions in the recovery of protein from bovine lung using pH shift. RESULT: Separate D-optimal designs were employed for protein solubilization and precipitation. Independent variables investigated for protein solubilization were time (10-120 minutes), temperature (4-20 °C), pH (8-11) and solvent sample ratio (2.5-10). Variables for protein precipitation were time (0-60 minutes) and pH (4...
September 15, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28910718/water-quality-of-surface-runoff-and-lint-yield-in-cotton-under-furrow-irrigation-in-northeast-arkansas
#14
M Arlene A Adviento-Borbe, Brittany D Barnes, Oluwayinka Iseyemi, Amanda M Mann, Michele L Reba, William J Robertson, Joseph H Massey, Tina G Teague
Use of furrow irrigation in row crop production is a common practice through much of the Midsouth US and yet, nutrients can be transported off-site through surface runoff. A field study with cotton (Gossypium hirsutum, L.) was conducted to understand the impact of furrow tillage practices and nitrogen (N) fertilizer placement on characteristics of runoff water quality during the growing season. The experiment was designed as a randomized complete block design with conventional (CT) and conservation furrow tillage (FT) in combination with either urea (URN) broadcast or 32% urea ammonium nitrate (UAN) injected, each applied at 101kgNha(-1)...
September 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28901739/back-electron-transfer-at-tio2-nanotube-photoanodes-in-the-presence-of-a-h2o2-hole-scavenger
#15
Heng Zhu, Shicheng Yan, Zhaosheng Li, Zhigang Zou
Adding charge scavengers, which usually are more unstable than water, is an effective method to quantify the quantum efficiency loss of photoelectrode during the charge separation, transfer, and injection processes of the water splitting reaction. Here, we detected, on TiO2 nanotube photoanodes after using hydrogen peroxide (H2O2) as a hole scavenger, a nearly 40% saturated photocurrent decrease in alkaline electrolyte and a negligible saturated photocurrent difference in acid electrolyte. We found that the photoelectrons were trapped in the surface states of TiO2 with nearly the same storage capacity of electrons in a wide range of pH values from 1...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28899552/the-use-of-dissolvable-layered-double-hydroxide-components-in-an-in-situ-solid-phase-extraction-for-chromatographic-determination-of-tetracyclines-in-water-and-milk-samples
#16
Nattaphorn Phiroonsoontorn, Sira Sansuk, Yanawath Santaladchaiyakit, Supalax Srijaranai
This research presents a simple and green in situ solid phase extraction (is-SPE) combined with high-performance liquid chromatography (HPLC) for the simultaneous analysis of tetracyclines (TCs) including tetracycline, oxytetracycline, and chlortetracycline. In is-SPE, TCs were efficiently extracted through the precipitation formation of dissolvable layered double hydroxides (LDHs) by mixing the LDH components such as magnesium and aluminum ions (both in metal chloride salts) thoroughly in an alkaline sample solution...
September 4, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28895723/high-efficiency-co-coxsy-s-n-codoped-porous-carbon-electrocatalysts-fabricated-from-controllably-grown-s-n-including-co-based-mofs-for-rechargeable-zinc-air-batteries
#17
Shengwen Liu, Xian Zhang, Guozhong Wang, Yunxia Zhang, Haimin Zhang
Developing bifunctional oxygen electrocatalysts with superior catalytic activities of oxygen reduction reaction (ORR) and oxygen revolution reaction (OER) is crucial to their practical energy storage and conversion applications. In this work, we report the fabrication of Co/CoxSy@S,N-codoped porous carbon structures with various morphologies, specific surface areas and pore structures, derived from controllably grown Co-based metal-organic frameworks with S- and N-containing organic ligands (thiophene-2,5-dicarboxylate, Tdc and 4,4'-bipyridine, Bpy) utilizing solvent effect (e...
September 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28892697/water-sorption-in-pretreated-grasses-as-a-predictor-of-enzymatic-hydrolysis-yields
#18
Daniel L Williams, Jacob D Crowe, Rebecca G Ong, David B Hodge
This work investigated the impact of two alkaline pretreatments, ammonia fiber expansion (AFEX) and alkaline hydrogen peroxide (AHP) delignification performed over a range of conditions on the properties of corn stover and switchgrass. Changes in feedstock properties resulting from pretreatment were subsequently compared to enzymatic hydrolysis yields to examine the relationship between enzymatic hydrolysis and cell wall properties. The pretreatments function to increase enzymatic hydrolysis yields through different mechanisms; AFEX pretreatment through lignin relocalization and some xylan solubilization and AHP primarily through lignin solubilization...
September 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28888938/occurrence-of-vibrio-cholerae-in-water-reservoirs-of-burkina-faso
#19
Kaboré Saidou, Philippe Cecchi, Thomas Mosser, Toubiana Mylène, Traoré Oumar, Aboubakar S Ouattara, Alfred S Traoré, Nicolas Barro, Rita R Colwell, Patrick Monfort
Africa is currently an important region in which cholera epidemics occur. Little is known about the presence of Vibriocholerae in freshwater bodies in Africa. There are ca. 1,700 lakes and reservoirs in Burkina Faso, most of which have been built within recent decades to secure water resources. The purpose of this study was to investigate the presence of V. cholera in the water of reservoirs, using the most-probable-number polymerase chain reaction. Results showed that V. cholera could be detected in water samples collected from 14 of 39 sampled reservoirs...
September 6, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28888859/determination-of-heavy-metal-toxicity-by-using-a-micro-droplet-hydrodynamic-voltammetry-for-microalgal-bioassay-based-on-alkaline-phosphatase
#20
Md Saiful Islam, Kazuto Sazawa, Noriko Hata, Kazuharu Sugawara, Hideki Kuramitz
We developed an electrochemical microalgal bioassay for the determination of heavy metal toxicity in water on the basis of the alkaline phosphatase (ALP) enzyme inhibition of Chlamydomonas reinhardtii. Five heavy metals were chosen as toxicants: Hg, Cd, Pb, Zn, and Cu. The induced ALP activity of C. reinhardtii was inhibited using the phosphate starvation method, and the results were evaluated by measuring the electrochemical oxidation of p-aminophenol (PAP) following the enzymatic conversion of p-aminophenyl phosphate (PAPP) as a substrate...
September 4, 2017: Chemosphere
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