Wyniki wyszukiwania - BazTech

1

Contribution on fluid inclusion abundance to activation of quartz flotation

Yuan Y., Zhang L., Guan J., Zhang C., Wu J., Chen Z.

Physicochemical Problems of Mineral Processing

|

2018

|

Vol. 54, iss. 3

981--991

EN

In this study, comparative experiments were conducted on the recovery of quartz using flotation with different fluid inclusion abundances. A large number of fluid inclusions with various sizes have been found in natural quartz. Micrographs, inductively coupled plasma, electron probe microanalysis, homogenization temperature, Raman spectra, zeta potentials, X-ray photoelectron spectroscopy, scanning electron microscope, and energy dispersive spectrometer were used to characterize the fluid inclusions and quartz, as well as the adsorption tests and single mineral flotation experiments to investigate its floatability. The results demonstrated that it was more likely for quartz with higher fluid inclusion abundance to connect with Fe3+ sufficiently to achieve a high level of flotation recovery, due to the powerful collecting ability by sodium dodecyl sulphonate to Fe3+. Furthermore, the mechanism indicated that the adsorption between quartz and Fe3+ was a process of chemisorption.

2

Characteristics of cationic red x-grl adsorption by raw diatomite and diatomite concentrate

Ren Z., Guan J., Gao H., Tian J., Wen Y., Zheng R.

Physicochemical Problems of Mineral Processing

|

2016

|

Vol. 52, iss. 1

44--55

EN

Raw diatomite (RD) and diatomite concentrate (DC) were used for the adsorption of cationic Red X-GRL from aqueous solutions. Mono-factor experiments were carried out to investigate the effects of the operation factor, and adsorption kinetics, isotherms, thermodynamics and mechanisms were explored. Similar trend for X-GRL adsorption onto RD and DC was observed. The adsorption capacity of dyes increased slightly with temperature, and the neutral pH was the optimum level. The adsorption processes occurred in accordance with the pseudo second-order model and were well fitted by the Langmuir isotherm model. The main driving forces of the physical adsorption on the diatomite were electrostatic attraction and van der Waals force. The RD could uptake more X-GRL than DC due to its higher content of fine particle and therefore, due to higher surface area available for adsorption. Raw diatomite as a cheap absorbent for X-GRL removal can be suggested as a promising supplement to activated carbon.

3

Anchoring tri(8-quinolinolato)iron onto SBA-15 for partial oxidation of benzyl alcohol using water as the solvent

Yang X., Liu J., Kan Q, Guan J.

Polish Journal of Chemical Technology

|

2014

|

Vol. 16, nr 3

12--17

EN

Tri(8-quinolinolato)iron complex immobilized onto SBA-15 catalyst has been synthesized through a stepwise procedure. The characterization results indicated that the BET surface area, total pore volume and average pore width decrease after stepwise modification of SBA-15, while the structure keeps intact. Catalytic tests showed that FeQ3-SBA-15 catalyzes the oxidation reaction well with 34.8% conversion of benzyl alcohol and 74.7% selectivity to benzaldehyde when water is used as the solvent after 1 h reaction. In addition, homogeneous catalyst tri(8-quinolinolato)iron exhibits very bad catalytic behavior using water as the solvent.

4

Mathematic Simulating of Levofloxacin Release from Chitosan Nano/Microparticles

Guan J., Cheng P., Huang S., Li Z., Wu J., Gao P., Wang X., Zhang H.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 7b

345--349

EN

Chitosan based levofloxacin nano/microparticles were prepared by ionotropic gelatin and emulsion crosslinking technique. Their in vitro release profiles showed that microparticles had better sustaining delivery property than nanoparticles. The best fitting kinetics for nanoparticles and microparticles were First Order and Diffusion-Relaxation model respectively. The result suggests that levofloxacin delivery from nanoparticles was mainly controlled by diffusion process only, and that from microparticles was dominated by both diffusion and relaxation process.

PL

Mikro- i nanoelementy lekarstwa levofloaxin były wytwarzane techniką sieciowania emulsji. Dla lepszego dopasowania kinematyki opracowano model matematyczny. Stwierdzono że nanocząstki dostarczają materiał przez dyfuzję podczas gdy mikrocząstki wykorzystują też relaksację.

5

Selective Oxidation and Oxidative Dehydrogenation of Isobutane on Mo-V-Te-P Mixed Metal Oxide Catalysts

Guan J., Wang G., Jing S., Wang Z., Kan Q.

Polish Journal of Chemistry

|

2006

|

Vol. 80, nr 8

1397-1405

EN

MoV0.3Te0.23Px (x = 0-0.5) catalysts have been prepared and tested in the selective oxidation of isobutane. Among them, MoV0.3Te0.23P0.3 catalyses the direct oxidation of isobutane to methacrolein and methacrylic acid with 33% selectivity, and a total dehydrogenation (olefin plus methacrolein andmethacrylic acid) selectivity up to 63%at 400 graduate C.