Novel Rhodamine B and 2 H ‐benzo[ b ][1,4]oxazin‐3(4 H )‐one‐derived Fluorescent Sensor for Low pH Value Detection

2019 ◽  
Vol 40 (8) ◽  
pp. 787-790
Author(s):  
Mingjun Chen ◽  
Xueke Bai ◽  
Zhenping Qi ◽  
Shoubo Xiang ◽  
Hua Zuo ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Ph Value ◽  
Fluorescent Sensor ◽  
Low Ph

Adsorption of Organic Compounds on Refined Latvian Clay

2018 ◽  
Vol 788 ◽  
pp. 83-88
Author(s):  
Oskars Leščinskis ◽  
Ruta Švinka ◽  
Visvaldis Švinka
Keyword(s):  
Methyl Orange ◽  
Zeta Potential ◽  
Adsorption Capacity ◽  
Clay Minerals ◽  
Organic Compounds ◽  
Clay Mineral ◽  
Rhodamine B ◽  
Ph Value ◽  
Ftir Spectra ◽  
Ph Values

Clays are materials consisting of clay minerals and non-clay minerals. Clay mineral fraction is considered to be a nanofraction. Clay minerals can be used for water purification and treatment. Description and characterization of 3 different Latvian clay nanosized minerals from 3 different geological periods (clay Liepa from Devonian period, clay Vadakste from Triassic period and clay Apriki from Quaternary period) as well as their adsorption capacity concerning organic compounds such as methyl orange and rhodamine B are summarized. Nanosized clay mineral particles were obtained using sedimentation method. Particle size distribution, zeta potential and FTIR spectra is given. The adsorption tests of above mentioned organic compounds were carried out in water solutions at 3 different pH values. The adsorption values were determined by means of UV-spectrophotometric technique. Zeta potential values for clay minerals Apriki, Liepa and Vadakste are -40.9 mV, -49.6 mV and -43.0 mV, respectively. FTIR spectra show similar tendencies for all 3 clay minerals. The best adsorption capacity concerning methyl orange and rhodamine B were in solutions with a pH value of 2, whereas at neutral and alkaline pH values adsorption in 24 hours was not observed.

scholarly journals Degradation of methylene blue by natural manganese oxides: kinetics and transformation products

2019 ◽  
Vol 6 (7) ◽  
pp. 190351 ◽  
Author(s):  
Shuangxi Zhou ◽  
Zhiling Du ◽  
Xiuwen Li ◽  
Yunhai Zhang ◽  
Yide He ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Manganese Oxides ◽  
Ph Value ◽  
Low Cost ◽  
Reaction System ◽  
Transformation Products ◽  
Low Ph ◽  
Initial Concentration ◽  
Environmental Material ◽  
High Redox Potential

In this study, natural manganese oxides (MnO x ), an environmental material with high redox potential, were used as a promising low-cost oxidant to degrade the widely used dyestuff methylene blue (MB) in aqueous solution. Although the surface area of MnO x was only 7.17 m 2 g −1 , it performed well in the degradation of MB with a removal percentage of 85.6% at pH 4. It was found that MB was chemically degraded in a low-pH reaction system and the degradation efficiency correlated negatively with the pH value (4–8) and initial concentration of MB (10–50 mg l −1 ), but positively with the dosage of MnO x (1–5 g l −1 ). The degradation of MB fitted well with the second-order kinetics. Mathematical models were also built for the correlation of the kinetic constants with the pH value, the initial concentration of MB and the dosage of MnO x . Furthermore, several transformation products of MB were identified with HPLC-MS, which was linked with the bond energy theory to reveal that the degradation was initiated with demethylation.

Significant improved selectivity of a fluorescent sensor for Al3+ made from a fluorinated rhodamine B Schiff base

2018 ◽  
Vol 45 (4) ◽  
pp. 1815-1827 ◽  
Author(s):  
Chao Wan ◽  
Hui Li ◽  
Jianzhi Wang ◽  
Feng Wang ◽  
Ge Shu ◽  
...  
Keyword(s):  
Schiff Base ◽  
Rhodamine B ◽  
Fluorescent Sensor

Rhodamine B associated Ag/r-GO nanocomposites as ultrasensitive fluorescent sensor for Hg2+

2020 ◽  
Vol 154 ◽  
pp. 104577 ◽  
Author(s):  
Deepak Sahu ◽  
Niladri Sarkar ◽  
Priyaranjan Mohapatra ◽  
Sarat K. Swain
Keyword(s):  
Rhodamine B ◽  
Fluorescent Sensor

A colorimetric fluorescent sensor for Cr3+ based on a novel diarylethene with a naphthalimide-rhodamine B group

2015 ◽  
Vol 303-304 ◽  
pp. 59-66 ◽  
Author(s):  
Dandan Xue ◽  
Chunhong Zheng ◽  
Congbin Fan ◽  
Gang Liu ◽  
Shouzhi Pu
Keyword(s):  
Rhodamine B ◽  
Fluorescent Sensor

Characterization of KDP crystal grown from solution with low pH value

2009 ◽  
Vol 44 (5) ◽  
pp. 500-504 ◽  
Author(s):  
Zhong De-Gao ◽  
Teng Bing ◽  
Dong Sheng-Ming ◽  
Wang Qing-Guo ◽  
Zhao Yan-Shuai ◽  
...  
Keyword(s):  
Ph Value ◽  
Low Ph ◽  
Kdp Crystal

Preparation of Microcapsules for Self-Healing Polymers

2012 ◽  
Vol 729 ◽  
pp. 205-209
Author(s):  
Anna Czeller ◽  
Tibor Czigány
Keyword(s):  
Optical Microscopy ◽  
Ph Value ◽  
Low Ph ◽  
Wall Material ◽  
Self Healing ◽  
Reaction Conditions ◽  
Water Emulsion ◽  
Oil In Water ◽  
Oil In Water Emulsion ◽  
Polymerization Method

In this paper, melamin-formaldehyde microcapsules filled with pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) or epoxy were prepared via oil-in-water emulsion polymerization method. Two different routes were chosen from literature, and applied with some changes. The effects of modification of reaction conditions on the resulting capsules were studied. It was found that too low pH value in the emulsion causes burst polymerization of the wall material, without microcapsule formation. When pH was set to 4.5 spherical microcapsules were formed. Optical microscopy was used to evaluate the microcapsules.

A highly sensitive probe detecting low pH area of HeLa cells based on rhodamine B modified β-cyclodextrins

2009 ◽  
Vol 17 (16) ◽  
pp. 6015-6019 ◽  
Author(s):  
Takuto Hasegawa ◽  
Yoshihiko Kondo ◽  
Yukio Koizumi ◽  
Toshihiro Sugiyama ◽  
Akane Takeda ◽  
...  
Keyword(s):  
Hela Cells ◽  
Rhodamine B ◽  
Low Ph ◽  
Highly Sensitive

Effect of pH on the Luminescent Properties of the Green Fluorescent Ink-Jet Ink

2011 ◽  
Vol 380 ◽  
pp. 107-111 ◽  
Author(s):  
Shao Hong Gao ◽  
Xian Fu Wei ◽  
Bei Qing Huang ◽  
Chun Yan Lu
Keyword(s):  
Quantum Yield ◽  
Ph Value ◽  
Luminescent Properties ◽  
Low Ph ◽  
Luminous Intensity ◽  
Ink Jet ◽  
Effects Of Ph ◽  
Deep Ultraviolet ◽  
Fluorescent Quantum Yield ◽  
Green Fluorescent

pH value of fluorescent ink-jet ink has an obvious influence on fluorescent powder, high or low pH value could cause some problems, such as fluorescence quenches, fluorescent quantum yield decreased, and so on. And these factors make against fluorescent ink-jet ink luminous properties reach the best result. This article is to design fluorescent ink-jet ink formula when it is exposured to deep Ultraviolet light to display green, and a series of ink samples were prepared. pH regulator was used to regulate pH value of green fluorescent ink-jet ink system. This paper discusses the effects of pH value on luminous intensity, fluorescent quantum yield. The results indicated that triethanolamine can regulate pH value of fluorescent ink-jet ink, when pH value increases from 8.70 to 11.20, luminous intensity, fluorescent quantum yield have a decrease tendency.

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