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
2004 ◽  
Vol 20 (12) ◽  
pp. 1434-1439 ◽  
Author(s):  
Li Yue-Xiang ◽  
◽  
Wang Tian-Hui ◽  
Peng Shao-Qin ◽  
Lü Gong-Xuan ◽  
...  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Che Ju Hsu ◽  
Bhupendra Pratap Singh ◽  
Pravinraj Selvaraj ◽  
Mareena Antony ◽  
Rajiv Manohar ◽  
...  

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.


2015 ◽  
Vol 16 (1) ◽  
pp. 34-43 ◽  
Author(s):  
Wei-ying Li ◽  
Yao Liu ◽  
Xiu-li Sun ◽  
Feng Wang ◽  
Lin Qian ◽  
...  

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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