Zhongmin Li

Preparation of a Low-Cost Adsorption Material from Red Mud and Bagasse

Preparation of bagasse carbon-red mud (BCRM), a low-cost adsorption material used in wastewater treatment, from red mud and bagasse has been studied. Effects of most important conditions in preparation process on the adsorption capability of BCRM were investigated. The optimal preparation parameters for BCRM were obtained. BCRM had a high surface area and a good mesoporous structure and exhibited an excellent adsorption capacity. The used BCRM could be regenerated via simple calcination at 573 K in air for 1 h. BCRM was an effective, economic, and regenerable material for adsorption of organic contaminants in wastewater.

Study on the Preparation of H3PW12O40–TiO2/Bentonite Composite Material

Preparation of H3PW12O40–TiO2/bentonite, a new photocatalytic composite material used in wastewater treatment, by a sol–gel and intercalation process has been investigated. Effects of most significant parameters in the manufacturing process on the photocatalytic activity of H3PW12O40–TiO2/bentonite were explored. The optimum values of parameters were as follows: calcination temperature was 200°C; mass ratio of TiO2 to bentonite () was 1:1; molar ratio of H3PW12O40 to TiO2 (MHPW/MTiO2) was 0.5:100; and intercalation time was 3 h. H3PW12O40–TiO2/bentonite had good photon absorption performance and high photocatalytic activity. The possible mechanism of enhanced photocatalytic activity of H3PW12O40–TiO2/bentonite in wastewater treatment was proposed.

Preparation of H3PMo12O40/organobentonite by chemical immobilization method and its catalytic performance in photo-Fenton process

AbstractHomogeneous photo-Fenton process has some significant disadvantages in wastewater treatment. Heterogeneous photo-Fenton process overcomes the disadvantages of homogeneous photo-Fenton process, and shows good prospects in engineering application. In this study, H3PMo12O40/organobentonite was prepared by a chemical immobilization method, and catalytic performance of H3PMo12O40/organobentonite as heterogeneous catalyst in photo-Fenton process was evaluated by adopting methyl orange (MO) dye as a model pollutant. The removal ratio of MO was impacted by reaction time, H2O2 concentration, and initial MO concentration. H3PMo12O40/organobentonite had a wide applicable range of pH and temperature for wastewater treatment. H3PMo12O40/organobentonite had a long-term stability, and retained almost all of its catalytic stability and activity for four recycling times. Characterization results of H3PMo12O40/organobentonite showed that H3PMo12O40 was successfully immobilized on the organobentonite by the chemical...

Preparation and application of acidified/calcined red mud catalyst for catalytic degradation of butyl xanthate in Fenton-like process

Acidified/calcined red mud (ACRM), a novel catalyst used in Fenton-like process, was prepared by acidification and calcination of red mud (RM). Catalyst characterization showed that iron phase of ACRM was mainly α-Fe2O3 and ACRM was a porous material with rough surface and loose structure. Degradation of butyl xanthate in Fenton-like process catalyzed by ACRM was investigated. Butyl xanthate was effectively degraded, and the degradation of butyl xanthate was well fitted by second order kinetic model. ACRM had an excellent long-term stability in a Fenton-like process. The possible mechanisms of hydroxyl radical production and butyl xanthate degradation in a Fenton-like process catalyzed by ACRM were presented.

Photo-Fenton degradation of ethyl xanthate catalyzed by bentonite-supported Fe(II)/phosphotungstic acid under visible light irradiation

In this study, using bentonite-supported Fe(II)/phosphotungstic acid composite (HPW-Fe-Organicbent) prepared by mechanochemical synthesis as heterogeneous catalyst, the photo-Fenton degradation of ethyl xanthate under visible light irradiation was studied in detail. The results showed that the degradation of ethyl xanthate was mainly impacted by H2O2 dosage, catalyst dosage and reaction time. HPW-Fe-Organicbent catalyst had a wide applicable range of pH and kept a high catalytic activity even at high pH in the photo-Fenton degradation of ethyl xanthate. It was found that the degradation of ethyl xanthate in the photo-Fenton process catalyzed by HPW-Fe-Organicbent mainly resulted from the hydroxyl radicals. HPW-Fe-Organicbent had an excellent stability in use, and retained almost all of its catalytic activity for four recycling times. Moreover, the kinetics study showed the degradation of ethyl xanthate, with the initial concentration below 50 mg/L, was well fitted by the pseudo-first-order rate model.

Biodiesel preparation from Jatropha oil catalyzed by KF/Red mud catalyst

ABSTRACT Biodiesel preparation from Jatropha oil catalyzed by KF/Red mud (KF/RM) was studied. The optimum values of parameters for preparation of Jatropha oil biodiesel were obtained. The conversion rate of transesterification reached 92.2% under the optimum conditions, and the used KF/RM could be regenerated. Catalyst characterization showed that KOH and KFeF4 were produced in KF/RM catalyst, which was crucial for the transesterification of Jatropha oil with methanol. Red mud was a good support to prepare KF-loaded catalyst, and prepared KF/RM was an excellent catalyst for biodiesel synthesis from Jatropha oil via transesterification reaction.