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Wang Y.,Tianjin Key Laboratory of Aquatic Science and Technology | Xiong Z.-H.,Tianjin Key Laboratory of Aquatic Science and Technology | Zhou J.-G.,Tianjin Institute of Urban Construction
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

The calyx[4]arene was synthesized and connected to Amberlite XAD-4 resin covalently through a diazotization bound. The structure of Amberlite XAD-4 resin base on calyx[4]arene was characterized using FT-IR, SEM and TG/DTA. The sorption results showed that Amberlite XAD-4 resin base on calyx[4]arene had much better removal to the diclofenac in aqueous solutions than Amberlite XAD-4 resin and calyx[4]arene which were presence alone in aqueous solutions. The removal rate of diclofenac increased rapidly with the calyx[4]arene modified Amberlite XAD-4 resin dosage. In the condition of DCF concentration was 20 mg/L, when the Amberlite XAD-4 resin base on calyx[4]arene dosage came up to 80 mg/L, the removal rate of diclofenac was 92.8% and reached equilibrium, the corresponding amount adsorbed was 34.02 mg/g. Kinetic analyses were conducted using pseudo first-order and second-order models. The linear correlation coefficients and standard deviations of Langmuir and Freundlich isotherms were determined, and the results revealed that Langmuir and Freundlich isotherm were fitted the experimental data well. The thermodynamic parameters calculated indicated, ΔH and ΔG were negative, which predicated adsorption process of diclofenac on f Amberlite XAD-4 resin base on calyx[4]arene resin was exothermic and spontaneous.


Fan X.,Tianjin Institute of Urban Construction | Fan X.,Tianjin Key Laboratory of Aquatic Science and Technology | Zhang X.,Tianjin Institute of Urban Construction | Zhang X.,Tianjin University
Advanced Materials Research | Year: 2013

Heavy metal leaching limits activated carbon from sewage sludge (referred as ACS) to be used for wastewater treatment. Cr and Cd leaching from ACS exceed the permitted values. The leaching content of Cr and Cd decrease much with depositing ACS with chitosan (CS),below the permitted values. This is mainly due to the bind of Cr and Cd with the much group -NH2 of CS. The effects of initial dye concentration, pH and contact time had been studied. The dye adsorbed can act as a supple complexion agent with increasing initial dye concentration, increase the affinity for Cr and Cd. For Cd, the amount leaching of CS/ACS or ACS remains content with pH.The amount leaching of Cr decreases when the pH from 1 to 5 and then increases above the pH of 6.0. The contact time has no important influence on the leaching contents of Cr or Cd. © (2013) Trans Tech Publications, Switzerland.


Fan X.,Tianjin Institute of Urban Construction | Fan X.,Tianjin Key Laboratory of Aquatic Science and Technology | Zhang X.,Tianjin Institute of Urban Construction | Zhang X.,Tianjin University
Applied Mechanics and Materials | Year: 2013

The simultaneous removal of SO2 and NO was investigated with the activated carbon from sewage sludge (referred as ACS) modified by chitosan (referred as CS).The effects of CS loading and operating conditions on the simultaneous removal of SO2 and NO were analyzed. The results indicate that compared with the ACS, impregnating CS results in significant increase in SO2 or NO removal. Relative humidity enhances SO2 adsorption capacities, but not for NO. The SO2 adsorption capacities of the CS / ACS show no obvious decrease at small amount of NO in the feed. However, higher amounts of NO reduce the SO2 adsorption capacities. The opposite phenomenon appears for NO when a small amount of SO2. So a competitive sorption consists between NO and SO2. Simultaneous adsorptions for NO and SO2 is due to more active sites from CS. © (2013) Trans Tech Publications, Switzerland.


Fan X.D.,Tianjin University | Fan X.D.,Tianjin Key Laboratory of Aquatic Science and Technology | Zhang X.K.,Tianjin University
Journal of Residuals Science and Technology | Year: 2015

Food waste residue is an intractable problem worldwide. The current study discussed the potential of adsorbents prepared from food waste residue (AFWR) for heavy metal removal from wastewater. The microstructure of AFWR was characterized, and kinetic studies on the simultaneous adsorption of Pb2+, Cu2+, Zn2+ and Cd2+ ions from aqueous solutions by AFWR were carried out. It was found that the adsorption of all heavy metals followed a pseudo-second-order kinetics, so that there was a competitive adsorption for Pb2+, Cu2+, Zn2+ and Cd2+. According to the experimental results, the adsorption in competition beads with the heavy metals presented an order of Cu2+ > Pb2+ > Zn2+ > Cd2+. © 2015 DEStech Publications, Inc.


Fan X.,Tianjin Institute of Urban Construction | Fan X.,Tianjin Key Laboratory of Aquatic Science and Technology | Zhang X.,Tianjin Institute of Urban Construction | Zhang X.,Tianjin University | Xu T.,Tianjin University
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2012

The activated carbon from sewage sludge (ACS) was modified with the chitosan (CS). The desulfurization and denitrification properties of the modified ACS with CS (referred as CS/ACS) were investigated experimentally. The structure and the surface groups of produced CS/ACS were analyzed by BET surface area measurement, scanning electron microscopy (SEM), x-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The effects of modification conditions on the desulfurization and denitrification properties of CS/ACS were investigated to explain the mechanism for SO 2 and NO removal. The results indicated that the pore diameters of CS/ACS were smaller compared with ACS. The binding between ACS and CS in the CS/ACS was good by the chemical bond. Both the modification temperature and the time were able to change the BET surface areas and pore volume of the CS/ACS, with the effect of temperature more significantly. The BET surface area, total pore volume and mesopore volume of the optimum pore structure of A3 were 168.76 m 2·g -1, 0.084 cm 3·g -1 and 0.041 cm 3·g -1, respectively. Compared with the ACS, the desulfurization and denitrification properties of the CS/ACS were greatly improved. This was because of the nitrogen and oxygen containing functional groups of -NH 2 and -O which were formed on the surfaces of ACS and increased the amount and types of the functional groups for the chemical adsorption of SO 2 and NO. The physical adsorption was also improved by controlling modification conditions to obtain optimum BET surface area and mesopore volume, upgrading the desulfurization and denitrification properties.

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