Nucleation control and separation of vanillin polymorphs I and II through the swift cooling crystallization process

CrystEngComm ◽  
2021 ◽  
Vol 23 (7) ◽  
pp. 1634-1642
Author(s):  
Supriya Sundareswaran ◽  
Srinivasan Karuppannan
Keyword(s):  
Aqueous Solution ◽  
Crystallization Process ◽  
Stable Form ◽  
Cooling Crystallization ◽  
Metastable Form ◽  
Pure Aqueous Solution

Stable form-I and metastable form-II polymorphs of vanillin are identified through morphology and separated in terms of supersaturation ranges from pure aqueous solution without the use of nucleation selecting materials.

A highly selective and sensitive fluorescent chemosensor for Hg2+ based on a pyridine-appended π-conjugated ligand

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 47000-47004 ◽  
Author(s):  
Yaping Yang ◽  
Xin-Long Ni ◽  
Tao Sun ◽  
Hang Cong ◽  
Gang Wei
Keyword(s):  
Aqueous Solution ◽  
Organic Synthesis ◽  
Fluorescence Enhancement ◽  
Fluorescent Chemosensor ◽  
Selective Method ◽  
Pure Aqueous Solution

A sensitive and selective method for the determination of Hg2+ cations by fluorescence enhancement in pure aqueous solution was developed and obtained by simple organic synthesis.

A highly selective and reversible water-soluble polymer based-colorimetric chemosensor for rapid detection of Cu2+ in pure aqueous solution

2016 ◽  
Vol 40 (5) ◽  
pp. 4513-4518 ◽  
Author(s):  
Guang Li ◽  
Farong Tao ◽  
Qian Liu ◽  
Liping Wang ◽  
Zhuang Wei ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Glycol ◽  
Rapid Detection ◽  
Water Soluble ◽  
Soluble Polymer ◽  
Water Soluble Polymer ◽  
Colorimetric Chemosensor ◽  
Pure Aqueous Solution

A novel reversible colorimetric chemosensor based on polyethylene glycol has been developed to detect Cu2+ ions in pure aqueous solution.

Photostability of the UV filter benzophenone-3 and its effect on the photodegradation of benzotriazole in water

2011 ◽  
Vol 8 (6) ◽  
pp. 581 ◽  
Author(s):  
You-Sheng Liu ◽  
Guang-Guo Ying ◽  
Ali Shareef ◽  
Rai S. Kookana
Keyword(s):  
Aqueous Solution ◽  
Uv Irradiation ◽  
Environmental Fate ◽  
Solar Light ◽  
Ultraviolet Rays ◽  
Uv Filter ◽  
Small Loss ◽  
Bond Scission ◽  
Solar Radiation Exposure ◽  
Pure Aqueous Solution

Environmental contextThe environmental fate of a particular contaminant can be influenced by the presence of other chemicals. It is shown that the photodegradation in water of benzotriazole, a common household and industrial chemical, is reduced in the presence of a sunscreen compound. Thus, contaminants such as benzotriazole may persist longer in the environment in the presence of chemicals designed to filter ultraviolet rays, such as those used in sunscreens. AbstractThe presence of co-solutes (e.g. UV filters) can potentially influence the environmental fate of micropollutants. The photolysis of benzotriazole (BT, an anticorrosion agent) and benzophenone-3 (BP-3, a UV filter), as well as their interactions in aqueous solutions under UV and artificial solar light with or without added humic acid (HA) and metal ions (Cu2+ and Fe3+), has been investigated. BT was found to be photosensitive under UV irradiation, but photostable under solar light. The half-lives for the photolysis of BT were 2.8 h in pure aqueous solution and increasing to 4.5 h in the presence of BP-3 (1.0 mg L–1). BP-3 was photostable under both UV and artificial solar light. Solar radiation exposure of 50 days resulted in a small loss of BP-3 (8 %) in pure aqueous solution, and resulted in a greater loss of BP-3 (up to 31 %) at 50 mg L–1 of HA. UV irradiation of the BT solutions containing BP-3 led to formation of five photoproducts, formed mainly by N–N and N–NH bond scission, polymerisation and hydroxylation. In the case of BP-3, one major photoproduct was isolated and tentatively identified as 2,4-dimethylanisole, formed by the loss of hydroxy and benzoyl groups.

Controlling the Size of Taurine Crystals in the Cooling Crystallization Process

2013 ◽  
Vol 52 (37) ◽  
pp. 13449-13458 ◽  
Author(s):  
Ruohui Lin ◽  
Meng W. Woo ◽  
Cordelia Selomulya ◽  
Jianping Lu ◽  
Xiao Dong Chen
Keyword(s):  
Crystallization Process ◽  
Cooling Crystallization

scholarly journals Polymorphs of anhydrous theophylline: stable form IV consists of dimer pairs and metastable form I consists of hydrogen-bonded chains

2011 ◽  
Vol 67 (12) ◽  
pp. o496-o499 ◽  
Author(s):  
Dikshitkumar Khamar ◽  
Robin Gavin Pritchard ◽  
Ian James Bradshaw ◽  
Gillian Ann Hutcheon ◽  
Linda Seton
Keyword(s):  
Stable Form ◽  
Metastable Form ◽  
Anhydrous Theophylline ◽  
Hydrogen Bonded
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