scholarly journals Titanium dioxide photocatalysis for the pulp and paper industry wastewater treatment

2011 ◽  
Vol 4 (3) ◽  
pp. 327-332 ◽  
Author(s):  
P. Kumar
Keyword(s):  
Titanium Dioxide ◽  
Wastewater Treatment ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Titanium Dioxide Photocatalysis ◽  
Industry Wastewater

scholarly journals Lignin-Depolymerisation via UV-Photolysis and Titanium Dioxide Photocatalysis

2017 ◽  
Author(s):  
Xuan Tung Do ◽  
Basma El Khaldi-Hansen ◽  
Anke Nietsch ◽  
Christian Jung ◽  
Steffen Witzleben ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Chemical Synthesis ◽  
Paper Industry ◽  
Black Liquor ◽  
Pulp And Paper Industry ◽  
Kraft Lignin ◽  
Pulp And Paper ◽  
Titanium Dioxide Photocatalysis ◽  
Irradiation Period ◽  
Over Time

Today, more than 70 million tons of lignin are produced by the pulp and paper industry every year. However, the utilization of lignin as a source for chemical synthesis is still limited due to the complex and heterogeneous lignin structure. The purpose of this study was a selective photodegradation of industrially available kraft lignin in order to obtain appropriate fragments and building block chemicals for further utilization, e.g. polymerization. Thus, kraft lignin obtained from soft wood black liquor by acidification was dissolved in sodium hydroxide and irradiated at a wavelength of 254 nm with and without the presence of titanium dioxide in various concentrations. Analyses of the irradiated products via SEC showed decreasing molar masses and decreasing polydispersity indices over time. At the end of the irradiation period the lignin was depolymerised to form fragments as small as the lignin monomers. TOC analyses showed minimal mineralisation due to the depolymerisation process.

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