scholarly journals The Coupling Use of Weak Magnetic Field and Fe0/H2O2 Process for Bisphenol a Abatement: Influence of Reaction Conditions and Mechanisms

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1724
Author(s):  
Liping Liang ◽  
Fenfen Xi ◽  
Liubiao Cheng ◽  
Weishou Tan ◽  
Qiang Tang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Bisphenol A ◽  
Weak Magnetic Field ◽  
Heterogeneous Fenton ◽  
Reaction Conditions ◽  
Bpa Removal ◽  
Ph Range ◽  
Background Ions

The coupling use of the heterogeneous Fenton-like process (zero-valent iron (Fe0)/H2O2) and weak magnetic field (MWF) for bisphenol A (BPA) abatement was systematically investigated in this study. Though both the Fe0/H2O2 and WMF-Fe0/H2O2 processes are sensitive to pH, WMF remarkably enhanced BPA removal under the pH range of 3.0–6.0 by 0.5–9.5 times. The characterization of Fe0 confirmed the role of WMF in promoting the corrosion of Fe0. Radicals, rather than Fe intermediates, were responsible for BPA degradation. Due to the presence of Cl– as the background ions and its reactivity towards HO•, reactive chlorine species (RCS, i.e., Cl• and Cl2•−) were produced and considerably contributed to BPA degradation. In addition, ~37% and 54% of degraded BPA was ascribed to RCS in the presence of 2 and 100 mM of Cl−, respectively. However, 1.9 mg/L of ClO3− was detected in the presence of 2 mM of Cl− in the WMF- Fe0/H2O2 process. HCO3− could diminish ClO3− generation significantly through transforming RCS. The concentration of ClO3− decreased by 74% and 82% with dosing 1 and 10 mM HCO3−, respectively. The results of this study suggest that the WMF-Fe0/H2O2 process is a promising approach for BPA removal.

scholarly journals Tuning Nanoscale Friction by Applying Weak Magnetic Fields to Reorient Adsorbed Oxygen Molecules

2018 ◽  
Vol 4 (1) ◽  
pp. 1 ◽  
Author(s):  
Z. Fredricks ◽  
K. Stevens ◽  
S. Kenny ◽  
B. Acharya ◽  
J. Krim
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Weak Magnetic Field ◽  
Quartz Crystal ◽  
Sliding Friction ◽  
Model Systems ◽  
Theoretical Studies ◽  
Weak Magnetic Fields ◽  
Gold Substrates

Sliding friction levels of thin (1–2 monolayers) and thick (~10 monolayers) oxygen films adsorbed on nickel and gold at 47.5 K have been measured by means of a quartz crystal microbalance (QCM) technique. Friction levels for the thin (thick) films on nickel in the presence of a weak magnetic field were observed to be approximately 30% (50%) lower than those recorded in the absence of the external field. Friction levels for thin films on gold were meanwhile observed to be substantially increased in the presence of the field. Magnetically-induced structural reorientation (magnetostriction) and/or realignment of adlayer spins, which respectively reduce structural and magnetic interfacial corrugation and commensurability, appear likely mechanisms underlying the observed field-induced reductions in friction for the nickel samples. Eddy current formation in the gold substrates may account for the increased friction levels in this system. The work demonstrates the role of magnetic effects in model systems that are highly amenable to theoretical studies and modeling.

The Role of Oxygen in the Priming of Neutrophils on Exposure to a Weak Magnetic Field

BIOPHYSICS ◽  
2018 ◽  
Vol 63 (2) ◽  
pp. 193-196 ◽  
Author(s):  
V. V. Novikov ◽  
E. V. Yablokova ◽  
E. E. Fesenko
Keyword(s):  
Magnetic Field ◽  
Weak Magnetic Field

scholarly journals Experimental Characterization of Geometric Aspects of the Behavior of Magnetic Shape Memory Materials and Theoretical Interpretation

2019 ◽  
Vol 4 (3) ◽  
pp. 121-126
Author(s):  
Juan Manuel Hernandez ◽  
P. Mullner ◽  
P. Linquist ◽  
J. Carreraa
Keyword(s):  
Magnetic Field ◽  
Geometric Analysis ◽  
Martensite Phase ◽  
Rotating Magnetic Field ◽  
Small Samples ◽  
Elastic Behavior ◽  
Theoretical Interpretation ◽  
Magnetic Shape Memory

Small samples of a Ni-Mn-Ga single crystal of three different geometries were subjected to bending by applying a rotating magnetic field. The magneto-mechanical behavior of the sample in cantilever was analyzed and special attention was given to elongations and curvature along the deformation process. A sequence of 3000 images was made using a high-resolution camera and the data was analyzed using a code in Matlab. Furthermore, the geometric analysis showed that, when the magnetic field is equal to cero, the sample do not recover its original shape totally and the presence of a pseudo-elastic behavior was observed. Analysis and interpretation of the data allows the presentation of some hypotheses concerning to the crystalline structure and the role of dislocations, represented by a dislocation density, in the martensite phase of these materials. These hypotheses are discussed more formally in the second part of this paper. Some experiments are proposed that would give the opportunity to a wider theoretical knowledge of MSMM.

Enhancement of the advanced Fenton process by weak magnetic field for the degradation of 4-nitrophenol

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 13357-13365 ◽  
Author(s):  
Xinmei Xiong ◽  
Yuankui Sun ◽  
Bo Sun ◽  
Weihua Song ◽  
Jingyi Sun ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Weak Magnetic Field ◽  
Fenton Process ◽  
Ph Range

A superimposed WMF could significantly improve the oxidative ability of Fe0/H2O2 and widen its applicable pH range.

Enhanced Cr(VI) removal by zero-valent iron coupled with weak magnetic field: Role of magnetic gradient force

2017 ◽  
Vol 176 ◽  
pp. 40-47 ◽  
Author(s):  
Jinxiang Li ◽  
Hejie Qin ◽  
Wei-xian Zhang ◽  
Zhong Shi ◽  
Dongye Zhao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Weak Magnetic Field ◽  
Zero Valent Iron ◽  
Gradient Force ◽  
Magnetic Gradient

scholarly journals Identification and Characterization of the Na+/H+ Antiporter NhaS3 from the Thylakoid Membrane of Synechocystis sp. PCC 6803

2009 ◽  
Vol 284 (24) ◽  
pp. 16513-16521 ◽  
Author(s):  
Kenta Tsunekawa ◽  
Toshiaki Shijuku ◽  
Mitsuo Hayashimoto ◽  
Yoichi Kojima ◽  
Kiyoshi Onai ◽  
...  
Keyword(s):  
Thylakoid Membrane ◽  
Ion Homeostasis ◽  
E Coli ◽  
Subjective Night ◽  
Genes Encoding ◽  
Ph Range ◽  
Identification And Characterization ◽  
Pcc 6803

Na+/H+ antiporters influence proton or sodium motive force across the membrane. Synechocystis sp. PCC 6803 has six genes encoding Na+/H+ antiporters, nhaS1–5 and sll0556. In this study, the function of NhaS3 was examined. NhaS3 was essential for growth of Synechocystis, and loss of nhaS3 was not complemented by expression of the Escherichia coli Na+/H+ antiporter NhaA. Membrane fractionation followed by immunoblotting as well as immunogold labeling revealed that NhaS3 was localized in the thylakoid membrane of Synechocystis. NhaS3 was shown to be functional over a pH range from pH 6.5 to 9.0 when expressed in E. coli. A reduction in the copy number of nhaS3 in the Synechocystis genome rendered the cells more sensitive to high Na+ concentrations. NhaS3 had no K+/H+ exchange activity itself but enhanced K+ uptake from the medium when expressed in an E. coli potassium uptake mutant. Expression of nhaS3 increased after shifting from low CO2 to high CO2 conditions. Expression of nhaS3 was also found to be controlled by the circadian rhythm. Gene expression peaked at the beginning of subjective night. This coincided with the time of the lowest rate of CO2 consumption caused by the ceasing of O2-evolving photosynthesis. This is the first report of a Na+/H+ antiporter localized in thylakoid membrane. Our results suggested a role of NhaS3 in the maintenance of ion homeostasis of H+, Na+, and K+ in supporting the conversion of photosynthetic products and in the supply of energy in the dark.

scholarly journals Synthesis and Characterization of Poly(methyl acrylate)-grafted-Sodium Salt of Partially Carboxymethylated Tamarind Kernel Powder

2022 ◽  
Vol 34 (2) ◽  
pp. 263-271
Author(s):  
J.H. Trivedi ◽  
J.R. Jivani ◽  
K.H. Patel ◽  
H.C. Trivedi
Keyword(s):  
Sodium Salt ◽  
Methyl Acrylate ◽  
Graft Copolymerization ◽  
Reaction Medium ◽  
Ceric Ammonium Nitrate ◽  
Solution Polymerization ◽  
Reaction Conditions ◽  
Tamarind Kernel

Ceric ammonium nitrate (CAN)-initiated graft copolymerization of methyl acrylate (MA) onto sodium salt of partially carboxymethylated tamarind kernel powder (Na-PCMTKP, DS = 0.15) was studied in an aqueous medium by solution polymerization technique. The growth of the graft reaction was monitored gravimetrically. The role of various synthesis variables on the grafting yields was examined to achieve the maximum graft yields (%G = 278.27, %GE = 94.38, %Hp = 5.62) and the influence of the synthesis variables in the graft copolymerization has been discussed. The reactivity of methyl acrylate (MA) towards graft copolymerization was compared with that of acrylonitrile (AN) on the basis of the results obtained from the earlier studies and plausible explanation was furnished for the observed reactivity of both the monomers towards grafting. The evaluated optimized reaction conditions were utilized to study the effect of reaction medium on grafting and it was found that reaction medium plays an important role in graft copolymerization. In order to ascertain the grafting, characterization of the samples made by FTIR, TGA and SEM was conducted. The synthesized novel graft copolymer may find potential application to be used as metal adsorbents.

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