Hubei Novel Reactor and Green Chemical Technology Key Laboratory

Wuhan, China

Hubei Novel Reactor and Green Chemical Technology Key Laboratory

Wuhan, China
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Zhan G.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | Yu J.-X.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | Xu Z.-G.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | Zhou F.,Central South University | Chi R.-A.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

Lanthanum oxalate hydrate La 2(C 2O 4) 3·10H 2O, the precursor of La 2O 3 ultrafine powders, was prepared by impinging stream reactor method with PEG 20000 as surfactant. Thermal decomposition of La 2(C 2O 4) 3·10H 2O from room temperature to 900 °C was investigated and intermediates and final solid products were characterized by FTIR and DSC-TG. Results show that the thermal decomposition process consists of five consecutive stage reactions. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods were implemented for the calculation of energy of activation (E), and the results show that E depends on α, demonstrating that the decomposition reaction process of the lanthanum oxalate is of a complex kinetic mechanism. The most probable mechanistic function, G(α)=[1-(1+α) 1/3] 2, and the kinetic parameters were obtained by multivariate non-linear regression analysis method. The average E-value that is compatible with the kinetic model is close to value which was obtained by FWO and KAS methods. The fitting curve matches the original TG curve very well. © 2012 The Nonferrous Metals Society of China.


Yu J.-X.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | Chi R.-A.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | Guo J.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | Zhang Y.-F.,Hubei Novel Reactor and Green Chemical Technology Key Laboratory | And 2 more authors.
Applied Surface Science | Year: 2012

Waste sugarcane bagasse (SCB) was modified by pyromellitic dianhydride to improve its adsorption capacity for cationic dyes. Results showed that the adsorption capacity of the modified SCB for methylene blue was 564 mg g -1, which was about 12 times than that obtained on the unmodified SCB. Methylene blue loaded modified SCB was regenerated by a self-clean eluent: TiO 2 hydrosol with pH ranged from 1 to 4, and HNO 3 solution with the same pH range was tested at the same time for comparison. Results showed that desorption kinetics of methylene blue in the hydrosol systems fit two-step kinetic model and controlled mainly by the slow step. As a self-clean eluent, acid hydrosol could firstly desorb and then photodegrade methylene blue under sunlight irradiation. After five desorption- photodegradation cycles, 78.3% of the absorbed dyes could be desorbed by using hydrosol (pH 2) as eluent. The hydrosol could be continuously used in desorption and photodegradation process, which would economize large volume of the eluent and moreover it would not bring secondary pollution. © 2011 Elsevier B.V. All rights reserved.

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