Chun-Fei Zhou
Hunan University
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Featured researches published by Chun-Fei Zhou.
Bioresource Technology | 2011
Xingzhong Yuan; Huajun Huang; Guangming Zeng; Hui Li; Jingyu Wang; Chun-Fei Zhou; Huina Zhu; Xiaokai Pei; Zhifeng Liu; Zhantao Liu
The risk (including bioavailability and eco-toxicity) of heavy metals (Pb, Zn, Cu, Cd, Cr and Ni) in liquefaction residues (LR) of sewage sludge (SS) was estimated, according to both the speciation of heavy metals and the local environmental characteristics. The amount of organic matters in LR was lower than that in SS, resulting in a smaller calorific value, while the total content of heavy metals in LR nearly doubled. High residual rates of heavy metals (about 80%) indicated that the heavy metals in SS were concentrated into LR after liquefaction. The comparisons of sequential extraction results between SS and LR showed that after liquefaction, the mobile and easily available heavy metal fractions (acid soluble/exchangeable and reducible fractions) were mainly transformed into the relatively stable heavy metal fractions (oxidizable and residual fractions). The bioavailability and eco-toxicity of heavy metals in LR were relieved, though the total concentrations of heavy metals increased.
Journal of Hazardous Materials | 2011
Guangming Zeng; Xue Li; Chang Zhang; Chun-Fei Zhou; Jing Niu; Liang-Jing Shi; Song-Bao He; Fei Li
Single and simultaneous removal of Cd(2+) and methylene blue (MB) with sodium dodecyl sulfate (SDS) by micellar-enhanced ultrafiltration under different experimental conditions was investigated. In single removal process, with initial SDS concentration increasing, the removal efficiency of Cd(2+) and MB kept increasing and then decreased. When the initial concentrations of SDS and Cd(2+) were 1.0 cmc and 50 mg L(-1), respectively, the maximum removal efficiency of Cd(2+) was obtained as 99.2%. Removal efficiency of MB could achieve more than 99.9% with initial SDS concentration below 2.0 cmc. As compared with single Cd(2+) removal, the removal efficiency of Cd(2+) in the presence of MB was slightly higher with initial SDS concentration below 1.0 cmc, while decreased with the SDS concentration above 1.0 cmc. The maximum removal efficiency of Cd(2+) was 98.8% when initial concentrations of SDS and MB were 1.0 cmc and 4 mg L(-1), respectively. The removal efficiency of MB in the presence of Cd(2+) could achieve higher than 96.5%, which was only 3.4% less than the optimum result of the single removal. Meanwhile, effect of pH on removal efficiency of Cd(2+) was more significant than that of MB.
Journal of Hazardous Materials | 2010
Fang Luo; Zeng Gm; Chang Zhang; Yao-Yao Fang; Yun-Huan Qu; Xue Li; Dan Lin; Chun-Fei Zhou
Micellar-enhanced ultrafiltration (MEUF) was used to remove phenol from simulant aqueous solutions. The effect of groups difference of cationic surfactant on the solubilization of phenol was investigated through orthogonal experiment, namely, surfactants with the same length of hydrocarbon chain but different hydrophilic head group and vice versa. The effects on the solubilization of phenol of various operating parameters in the practical application of MEUF with OTAB were studied, including surfactant concentration, electrolyte concentration, feed phenol concentration, operating pressure, temperature, respectively. The results showed that the rejection of phenol increased in the order as follows: cetyltrimethylammonium bromide (CTAB)<octadecyl trimethyl ammonium bromide (OTAB)<cetylpyridinium chloride (CPC). With the introduction of feed surfactant concentration, the retention recovery of phenol increased. Electrolyte concentration, feed phenol concentration, operating pressure and temperature all had a slight influence on the retention of phenol.
Journal of Hazardous Materials | 2010
Guangming Zeng; Chun-Fei Zhou; Xue Li; Liang-Jing Shi; Song-Bao He
Micellar-enhanced ultrafiltration (MEUF) is a powerful treatment developed to remove heavy metals from wastewater. Efficient removal of Cd(2+)/Zn(2+) from wastewater was performed by MEUF using a polysulfone hollow ultrafiltration membrane, with sodium dodecyl sulfate (SDS) as the surfactant. The adsorption of surfactant micelles and Cd(2+)/Zn(2+) in MEUF was studied by changing the surfactant dosage and the Cd(2+)/Zn(2+) concentration in the feed. In addition, kinetics, adsorption isotherms, and thermodynamic rules were analyzed, and X-ray photoelectron spectroscopy (XPS) was conducted. It was found that when the Cd(2+)/Zn(2+) feed concentration was 50 mg/L, and the SDS dosage reached 2.15 g/L, the concentration of heavy metal ions in the permeate stabilized at around 1-4 mg/L, and the adsorption of Cd(2+)/Zn(2+) on SDS micelles followed second-order kinetics and the Langmuir isotherm laws. Adsorption is a spontaneous endothermic process in which the adsorption force is principally the attraction of opposite electrical charges.
Journal of Membrane Science | 2010
Chun-Fei Zhou; Guangming Zeng; Xue Li; Jing Niu; Huajun Huang; Liang-Jing Shi; Song-Bao He
Fuel and Energy Abstracts | 2010
Chun-Fei Zhou; Guang-Ming Zeng; Xue Li; Jing Niu; Huajun Huang; Liang-Jing Shi; Song-Bao He
Separation and Purification Technology | 2012
Chun-Fei Zhou; Zeng Gm; Xue Li; Huajun Huang; Jing Niu; Fei Li; Liang-Jing Shi; Song-Bao He
Archive | 2010
Xue Li; Zeng Gm; Chun-Fei Zhou; Fang Luo; Jing Niu
Fuel and Energy Abstracts | 2011
Huajun Huang; Xingzhong Yuan; Guang-Ming Zeng; Jingyu Wang; Hui Li; Chun-Fei Zhou; Xiaokai Pei; Qiao You; Liang Chen
Archive | 2010
Chun-Fei Zhou; Zeng Gm; Xue Li; Fang Luo; Jing Niu; Huajun Huang