Efficient recovery of Ti, Fe and Mn based on the synergistic effect of acidic titanium dioxide wastewater and pyrolusite

2022 ◽  
Vol 45 ◽  
pp. 102484
Author(s):  
Zhaowang Liu ◽  
Yali Feng ◽  
Haoran Li ◽  
Haosheng Li
Keyword(s):  
Titanium Dioxide ◽  
Synergistic Effect ◽  
Fe And Mn ◽  
Efficient Recovery

scholarly journals Synergistic Effect of Eu3＋ and Si4＋ Co-doping on Photocatalytic Activity of Titanium Dioxide

2004 ◽  
Vol 20 (12) ◽  
pp. 1434-1439 ◽  
Author(s):  
Li Yue-Xiang ◽  
◽  
Wang Tian-Hui ◽  
Peng Shao-Qin ◽  
Lü Gong-Xuan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Co Doping

scholarly journals Superior improvement in dynamic response of liquid crystal lens using organic and inorganic nanocomposite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Che Ju Hsu ◽  
Bhupendra Pratap Singh ◽  
Pravinraj Selvaraj ◽  
Mareena Antony ◽  
Rajiv Manohar ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Liquid Crystal ◽  
Synergistic Effect ◽  
Electric Fields ◽  
Dipole Moments ◽  
Time Dependent ◽  
Titanium Dioxide Nanoparticle ◽  
Phase Profile ◽  
Rutile Titanium Dioxide ◽  
Liquid Crystal Lens

AbstractIn this study, the response time of a 4 mm-aperture hole-patterned liquid crystal (HLC) lens has been significantly improved with doping of N-benzyl-2-methyl-4-nitroaniline (BNA) and rutile titanium dioxide nanoparticle (TiO2 NP) nanocomposite. The proposed HLC lens provides the focus and defocus times that are 8.5× and 14× faster than the pristine HLC lens, respectively. Meanwhile, the focus and defocus times of the proposed HLC lens reach the order of millisecond. Result shows that the synergistic effect of BNA and TiO2 NP induces a 78% decrement in the viscosity of pristine LC mixture that significantly shortens the focus and defocus times of HLC lens. The remarkable decrement in viscosity is mainly attributed to spontaneous polarization electric fields from the permanent dipole moments of the additives. Besides, the strengthened electric field surrounding TiO2 NP assists in decreasing the focus time of HLC lens. The focus and defocus times of HLC lens are related to the wavefront (or phase profile) bending speed. The time-dependent phase profiles of the HLC lenses with various viscosities are calculated. This result shows the decrease in wavefront bending time is not simply proportional to viscosity decrement. Furthermore, the proposed HLC lens emerges a larger tunable focus capability within smaller voltage interval than the pristine HLC lens.

Photocatalytic degradation of MC-LR in water by the UV/TiO2/H2O2 process

2015 ◽  
Vol 16 (1) ◽  
pp. 34-43 ◽  
Author(s):  
Wei-ying Li ◽  
Yao Liu ◽  
Xiu-li Sun ◽  
Feng Wang ◽  
Lin Qian ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Free Radicals ◽  
Synergistic Effect ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Removal Rate ◽  
Optimum Conditions ◽  
Initial Concentration ◽  
High Production

The ultraviolet (UV)/titanium dioxide (TiO2)/hydrogen peroxide (H2O2) process (UTHP) has been proven to be effective in removing organics because of its high production of free radicals. In this study, UTHP was further investigated for the photocatalytic degradation of microcystin-LR (MC-LR). Results showed that three mechanisms could realize MC-LR photocatalytic degradation using TiO2. H2O2 could effectively inhibit recombination and considerably improve the production of radicals and superoxides. From a correlation of the removal rate with the isomerization and decomposition of MC-LR under UV irradiation it was inferred that isomerization was crucial for MC-LR degradation during photocatalysis given the vulnerability of the exposed conjugated double bonds. The photocatalysis of MC-LR was apparently dependent on pH and MC-LR initial concentration. Under the optimum conditions of pH 3.5, 0.05 g/L TiO2, and 0.05 mmol/L H2O2, 100% MC-LR (308 μg/L) could be removed within 60 min. This process was accompanied by a synergistic effect during the initial 10 min.

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