Efficient activation of peroxymonosulfate by copper supported on polyurethane foam for contaminant degradation: synergistic effect and mechanism

2021 ◽  
pp. 131741
Author(s):  
Tongcai Liu ◽  
Kai Yin ◽  
Nan Li ◽  
Hui Liu ◽  
Jiabin Chen ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Polyurethane Foam ◽  
Contaminant Degradation

Preparation of Rigid Flame Retardancy Polyurethane Foam Material with Difficult Combusted Degree

2012 ◽  
Vol 535-537 ◽  
pp. 1151-1157
Author(s):  
Zhen Hui Qiu ◽  
Yuan Bao Sun ◽  
Zhan He Du
Keyword(s):  
Synergistic Effect ◽  
Polyurethane Foam ◽  
Flame Retardancy ◽  
Flame Retardants ◽  
Oxygen Index ◽  
Orthogonal Experiment ◽  
Foam Material ◽  
Pu Foam ◽  
Series Of Experiments

The flame retardants used for the rigid PU foam material were studied systematically in this paper and a series of experiments were carried out to test the oxygen index (OI) of it. The synergistic effect in the different flame retardants also be verified to achieve a well flame retardancy performance. The best ingredients were found out by an orthogonal experiment which can give the PU foam maeterial a difficult combusted degree with the oxygen index higher than 34.

scholarly journals Degradation of the Textile Dye Reactive Black 5 by Basidiomycetes

2020 ◽  
Vol 15 (1) ◽  
pp. 1
Author(s):  
Leonardo Pellizzari Wielewski ◽  
Tatiana Zuccolotto ◽  
Marlene Soares ◽  
Liziê Daniela Tentler Prola ◽  
Marcus Vinicius de Liz
Keyword(s):  
Polyurethane Foam ◽  
Phanerochaete Chrysosporium ◽  
Textile Industry ◽  
Co2 Production ◽  
Textile Dye ◽  
Reactive Black 5 ◽  
Covalent Bonds ◽  
Solubility In Water ◽  
Contaminant Degradation ◽  
Reactive Groups

 Reactive Black 5 (RB5) is one of the synthetic reactive dyes most used in the textile industry, due to its solubility in water and reactive groups which form covalent bonds within the fiber. In the process of dyeing fabrics, however, it is estimated that 12-14% of dyes are released into the effluent.  This work evaluated the biodegradation of RB5 dye, adsorbed in polyurethane foam, by basidiomycetes (Phanerochaete chrysosporium ATCC 24725, Pleurotus ostreatus and Pleurotus floridae). Results were evaluated considering the partial- or total medium discoloration, the adsorption capacity of the dye in the polyurethane foam (PUF) and the respirometric measurements. The results showed that Phanerochaete chrysosporium was able to partially degrade 50 mg L-1 of RB5 in pH 6.0, when cultivated in Petri dishes. When this microorganism was cultivated in PUF cubes saturated with RB5 solution (50 mg L-1, pH 6.0), CO2 production reached an accumulated value of 2.16 mg on the fifteenth day, revealing the growth of the microorganism and consequently the contaminant degradation, which was used as the source of nutrients.

scholarly journals Enhanced Fire Safety of Rigid Polyurethane Foam via Synergistic Effect of Phosphorus/Nitrogen Compounds and Expandable Graphite

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4741
Author(s):  
Chuan Liu ◽  
Ping Zhang ◽  
Yongqian Shi ◽  
Xiaohui Rao ◽  
Suncheng Cai ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Polyurethane Foam ◽  
Fire Safety ◽  
Fire Hazard ◽  
Expandable Graphite ◽  
Nitrogen Compounds ◽  
Rigid Polyurethane Foam ◽  
Gaseous Products ◽  
The Matrix ◽  
Physical Barriers

In order to explore highly efficient flame-retardant rigid polyurethane foam (RPUF), phosphorus/nitrogen compounds and expandable graphite (EG) were successfully incorporated into RPUF by a free one-spot method. The combustion results showed that the fire safety of the RPUF samples was remarkably improved by the addition of phosphoric/nitrogen compounds and EG. With the incorporation of 22.4 wt.% phosphorus/nitrogen compounds and 3.2 wt.% EG, the RPUF composites achieved UL-94 V-0 rating. Besides, the total heat release and total smoke release of RPUF composites were reduced by 29.6% and 32.4% respectively, compared to those of the pure RPUF sample. PO• and PO2• together with nonflammable gaseous products were evolved from phosphoric/nitrogen compounds in the gas phase, which quenched the flammable free radicals in the matrix and diluted the concentration of combustible gaseous products generated from PRUF during combustion. The compact char residues which acted as excellent physical barriers were formed by catalysis of EG and phosphoric/nitrogen compounds in the condense phase. The fire hazard of RPUF was significantly reduced by the synergistic effect of phosphorus-nitrogen compounds and EG. This work provides a promising strategy to enhance the fire safety of RPUF.

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