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Alkaline water

Mingzhe Sun, Yumeng Li, Tianxin Wang, Yanwei Sun, Xiyuan Xu, Zesheng Zhang
The water-soluble polysaccharides extracted from endosperm of Gleditsia japonica var. delavayi seeds (EGSP) were identified as galactomannan having the M/G ratio of 2.54-2.66 and a weight average molecular weight (Mw) of 1913 kDa. The molecular structure of EGSP was determined by periodate oxidation, Smith degradation, methylation, FTIR and NMR spectroscopy. The main chain is composed of β-1,4-d-mannopyranose and the branches composed of single α-1-d-galactopyranose. We had also established a model to speculate the fine structure of galactomannan molecules and given preliminary results...
March 15, 2018: Carbohydrate Polymers
Wenfeng Li, Yalong Lu
The dried fruit of Sophora japonica L. is a traditional Chinese herb tea rich in sophoricoside that is an isoflavone glycoside. The aim of current study was to investigate the hepatic protective effect of sophoricoside in high fructose (HF) diet fed mice. Healthy male mice were fed 30% fructose water and treated 80 and 160 mg/kg·bw sophoricoside continuously for 8 wk. Our data showed that administration of sophoricoside at 80 and 160 mg/kg·bw observably decreased the body weight and liver weight in HF-fed mice...
January 19, 2018: Journal of Food Science
Guangbo Chen, Tao Wang, Jian Zhang, Pan Liu, Hanjun Sun, Xiaodong Zhuang, Mingwei Chen, Xinliang Feng
Owing to its earth abundance, low kinetic overpotential, and superior stability, NiFe-layered double hydroxide (NiFe-LDH) has emerged as a promising electrocatalyst for catalyzing water splitting, especially oxygen evolution reaction (OER), in alkaline solutions. Unfortunately, as a result of extremely sluggish water dissociation kinetics (Volmer step), hydrogen evolution reaction (HER) activity of the NiFe-LDH is rather poor in alkaline environment. Here a novel strategy is demonstrated for substantially accelerating the hydrogen evolution kinetics of the NiFe-LDH by partially substituting Fe atoms with Ru...
January 19, 2018: Advanced Materials
Qing-Song Li, Hui-Wen Cai, Guo-Xin Li, Guo-Yuan Chen, Xiao-Yan Ma, Wen-Long He
This study investigated the transformation of triclosan (TCS) following co-exposure to UV irradiation and ClO2. Special attention was given to understand the influencing of water quality parameters and toxicity changes during the co-exposure process. The results show that the co-exposure process prompted TCS elimination quickly and effectively, with more than 99% of TCS degraded under the experimental conditions. The molar yield ratios of 2,4-dichlorophenol/TCS (2,4-DCP/TCS) were calculated to be 35.81-74.49%; however, the by-product of 2,8-dichlorodibenzop-dioxin (2,8-Cl2DD) was not detected...
January 18, 2018: Environmental Science and Pollution Research International
Prabhakarn Arunachalam, Maged N Shaddad, Mohamed A Ghanem, Abdullah M Al-Mayouf, Mark T Weller
Photoanodes fabricated by the electrophoretic deposition of a thermally prepared zinc tantalum oxynitride (ZnTaO₂N) catalyst onto indium tin oxide (ITO) substrates show photoactivation for the oxygen evolution reaction (OER) in alkaline solutions. The photoactivity of the OER is further boosted by the photodeposition of cobalt phosphate (CoPi) layers onto the surface of the ZnTaO₂N photoanodes. Structural, morphological, and photoelectrochemical (PEC) properties of the modified ZnTaO₂N photoanodes are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet visible (UV-Vis) diffuse reflectance spectroscopy, and electrochemical techniques...
January 18, 2018: Nanomaterials
Le Zhang, Peng Fei Liu, Yu Hang Li, Meng Yang Zu, Xu Li, Zheng Jiang, Yun Wang, Huijun Zhao, Huagui Yang
Boosting the sluggish kinetics of hydrogen evolution reaction in alkaline environments is the key for large application of water-alkali and chlor-alkali electrolysis. Herein, for the first time, we use nitrogen atoms to precisely modulate electrochemical active sites on the surface of nickel oxide with low coordinated oxygen atoms, to achieve enhanced kinetics of alkaline hydrogen evolution. Theoretical and experimental results demonstrate that the surface charge redistribution after modulation simultaneously facilitates the initial water dissociation step, as well as the subsequent recombination of Had from low coordinated oxygen sites and desorption of OH-ad from nickel sites, thus accelerating the overall hydrogen evolution process...
January 18, 2018: ChemSusChem
Pawan Kumar Gaury, Narendra Kumar Meena, A K Mahajan
The present research is to study hydrochemistry and water quality of Rewalsar Lake during pre-monsoon, monsoon, and post-monsoon seasons. The Ca2+ and Na+ are observed as the dominant cations from pre- to post-monsoon season. On the other hand, HCO3- and Cl- are observed dominant anions during pre-monsoon and monsoon seasons, whereas HCO3- and SO42- during post-monsoon season. The comparison of alkaline earth metals with alkali metals and total cations (Tz+) has specified that the carbonate weathering is the dominant source of major ions in the water of lake...
January 17, 2018: Environmental Monitoring and Assessment
Mingling Dong, Wenshu Zheng, Yiping Chen, Bei Ran, Zhiyong Qian, Xingyu Jiang
Conventional magnetic sensors usually employ Fe-based magnetic materials as signal probes. In this work, we find that Cu(II) is also a useful longitudinal relaxation time (T1) signal-based magnetic probe. We adopt bathocuproinedisulfonic acid disodium salt hydrate (BCS) to chelate Cu(I) and form a stable Cu(I)-BCS complex in aqueous solution, and find the significant difference in T1 value of water protons between Cu(II) aqueous solution and Cu(I)-BCS complex aqueous solution. Redox reaction can convert Cu(II) to Cu(I) followed by the complexation of BCS, which results in apparent change of T1 that can serve as magnetic signal readout, which is the basis of this Cu-T1 sensor...
January 18, 2018: Analytical Chemistry
Sivaprakash Rajasekharan, Chris Vercruysse, Luc Martens, Ronald Verbeeck
Tricalcium silicate cements (TSC) are used in dental traumatology and endodontics for their bioactivity which is mostly attributed to formation of calcium hydroxide during TSC hydration and its subsequent release of calcium and hydroxide ions. The aim of this study was to determine the effect of volume (Vol), exposed surface area (ESA) and pH of surrounding medium on calcium ion release. Three commercially available hydraulic alkaline dental cements were mixed and condensed into cylindrical tubes of varying length and diameter (n = 6/group)...
January 13, 2018: Materials
Anshumali, Manish Kumar, Nikki Chanda, Abhay Kumar, Bijendra Kumar, Madavi Venkatesh
This study assessed the fluoride (F-) pollution in groundwater samples (n = 170) of tribal regions around Bailadila Iron Ore Mines [BIOM] Complex of Dantewada District, India. Weathering of carbonate and silicate clays were important geogenic sources of dissolved ions. A Piper diagram showed a Ca-HCO3 water type, with positive chloro-alkaline indices illustrating the occurrence of direct base-exchange reactions. The F- concentrations varied from 0.08 to 1.95 mg L-1 with a mean value of 0.9 ± 0.3 mg L-1...
January 16, 2018: Bulletin of Environmental Contamination and Toxicology
Narendra Kumar Alam Venugopal, Shuli Yin, Yinghao Li, Hairong Xue, You Xu, Xiaonian Li, Hongjing Wang, Liang Wang
Tailoring of new hydrogen evolution reaction (HER) electrocatalyst with earth abundant elements is important for large scale water splitting and hydrogen production. In this work, we present a simple synthetic method for incorporating iron phosphide (FeP) particles into three-dimensional (3D) porous graphene aerogel (GA) structure. The FeP formed in porous 3D GA (FeP/GA) is derived from electroactive Fe hexacyanoferrate (FeHCF). The advantage of incorporating FeP, in the porous 3D graphene network enables high accessibility for HER...
January 16, 2018: Chemistry, An Asian Journal
Zao Wang, Huitong Du, Zhiang Liu, Hui Wang, Abdullah M Asiri, Xuping Sun
It is of great importance to design and develop highly active electrocatalysts for the hydrogen evolution reaction (HER) under alkaline conditions. In this work, we report the development of a CeO2-Cu3P nanoarray supported on nickel foam (CeO2-Cu3P/NF) as an excellent HER catalyst with the demand of an overpotential of only 148 mV to deliver a geometrical catalytic current density of 20 mA cm-2 in 1.0 M KOH. Remarkably, this catalyst also shows strong long-term electrochemical durability for at least 100 h with nearly 100% Faradaic efficiency...
January 15, 2018: Nanoscale
Dan Wu, Yicheng Wei, Xiang Ren, Xuqiang Ji, Yiwei Liu, Xiaodong Guo, Zhiang Liu, Abdullah M Asiri, Qin Wei, Xuping Sun
It is highly desired but still remains challenging to design and develop a Co-based nanoparticle-encapsulated conductive nanoarray at room temperature for high-performance water oxidation electrocatalysis. Here, it is reported that room-temperature anodization of a Co(TCNQ)2 (TCNQ = tetracyanoquinodimethane) nanowire array on copper foam at alkaline pH leads to in situ electrochemcial oxidation of TCNQ- into water-insoluable TCNQ nanoarray embedding Co(OH)2 nanoparticles. Such Co(OH)2 -TCNQ/CF shows superior catalytic activity for water oxidation and demands only a low overpotential of 276 mV to drive a geometrical current density of 25 mA cm-2 in 1...
January 15, 2018: Advanced Materials
Subhodeep Sarker, Deepti Vashistha, Munmun Saha Sarker, A Sarkar
Molecular biomarkers are used world wide for quick assessment of the immediate effect of environmental pollution on marine ecosystems. Recently, we evaluated oxidative stress responses of marine rock oyster, Saccostrea cucullata impacted due to polycyclic aromatic hydrocarbons (PAHs) accumulated in their tissues at a few sampling sites along the coast of Goa around the region of the Arabian sea coast, India (Sarkar et al., 2017). Using a combination of partial alkaline unwinding and comet assays, we now report a comprehensive study on the impairment of DNA integrity (DI) in S...
January 11, 2018: Ecotoxicology and Environmental Safety
Endong Zhang, Shuanglin Dong, Fang Wang, Xiangli Tian, Qinfeng Gao
In order to reveal the effects of l-tryptophan (Trp) on the physiology and immune response of sea cucumber (Apostichopus japonicus Selenka) exposed to crowding stress, four density groups of sea cucumbers (i.e. 4, 8, 16 and 32 individuals per 40 L water, represented as L, ML, MH and H) were fed with diets containing 0, 1, 3 and 5% l-tryptophan respectively for 75 days. The results showed that the specific growth rates (SGR) of the sea cucumber fed with diet with 3% Trp (L, 2.1; ML, 1.76; MH, 1.2; H, 0.7) were significantly higher than those fed with basal diet without Trp supplementation (P < ...
January 10, 2018: Fish & Shellfish Immunology
Xue Zhao, Yun Bai, Tong Xing, Xing-Lian Xu, Guanghong Zhou
The functionality of pale, soft, exudative (PSE)-like chicken protein was improved by isoelectric solubilization/precipitation (ISP) treatment. PSE-like chicken proteins were solubilized at an acidic pH 3.5 or an alkaline pH 11.0, followed by precipitating at pH 5.5 and 6.2. PSE-like meat paste was treated as control (CON). Precipitated at pH 6.2 led to a more elastic gel than at pH 5.5. Water distribution of ISP-isolated protein was affected by precipitation pH. More tryptophan residues exposed and -SH was partially oxidized to disulfide bond after ISP treatment, which led to large aggregates formation and higher viscosity of ISP isolated proteins than of CON...
May 15, 2018: Food Chemistry
Dariush Naghipour, Seyed Davoud Ashrafi, Ali Mojtahedi, Masoud Vatandoost, Loghman Hosseinzadeh, Esmail Roohbakhsh
In this research, we measured various parameters related to drinking water quality include turbidity, temperature, pH, EC, TDS, Alkalinity, fecal and total coliform, heterotrophic plate count (HPC), free chlorine, Mn, Ca, Mg, Fe, Na, Cl-, F-, HCO3, in the inlet and outlet of household water treatment devices according to the standard methods for the examination of water and wastewater (W.E. Federation and Association and A.P.H., 2005) [1]. Sixty four inlet and outlet water samples were taken from thirty two household water treatment devices from eight different residential blocks in Golsar town of Rasht, Iran...
February 2018: Data in Brief
Su-Jin Lee, Woo-Seok Choi, Gun-Hoo Park, Tae-Ho Kim, Chulhong Oh, Soo-Jin Heo, Do-Hyung Kang
Microalgae hold promise as a renewable energy source for the production of biofuel, as they can convert light energy into chemical energy through photosynthesis. However, cost-efficient harvest of microalgae remains a major challenge to commercial-scale algal biofuel production. We firstly investigated the potential of electrolytic water as a flocculantfor harvesting Tetraselmis sp.Alkaline electrolytic water (AEW) is produced at cathode through water electrolysis.It contains mineral ions such as Na⁺, K⁺, Ca²⁺ and Mg²⁺ that can act as flocculant...
January 11, 2018: Journal of Microbiology and Biotechnology
Parvin Shahdousti, Mohammad Aghamohammadi
Dissolved carbon dioxide flotation-emulsification microextraction technique coupled with high-performance liquid chromatography was developed for the separation and determination of fat-soluble vitamins (A, D3 , E and K3 ) in multivitamin pharmaceutical preparations. Dissolved carbon dioxide flotation was used to break up the emulsion of extraction solvent in water and to collect the extraction solvent on the surface of the aqueous sample in the narrowed capillary part of extraction cell. Carbon dioxide bubbles were generated in situ through the addition of 300 μL of concentrated hydrochloric acid into the alkaline sample solution at pH = 11...
January 5, 2018: Journal of Separation Science
Yicheng Wei, Xiang Ren, Hongmin Ma, Xu Sun, Yong Zhang, Xuan Kuang, Tao Yan, Dan Wu, Qin Wei
Energy conversion and storage systems such as water splitting devices and metal-air batteries need excellent and energy-efficiency oxygen evolution reaction (OER) catalysts. Herein, we report the in-situ development of sawtooth-like Co(TCNQ)2 (TCNQ = tetracyanoquinodimethane) metal-organic framework array on Co foil (Co(TCNQ)2/Co) via solution immersion method at room temperature. As an oxygen-evolving catalyst, the resulting Co(TCNQ)2/Co demonstrates superior OER activity with overpotential of 310 mV to drive a geometrical catalytic current density of 15 mA cm-2 in 1...
January 4, 2018: Chemistry: a European Journal
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