title: Mechanisms of CPB Modified Zeolite on Mercury Adsorption in Simulated Wastewater.
abstract: A systematic study was carried out to analyze the effects of mercury(II) adsorption by surface modified zeolite (SMZ) and adsorption mechanism. Cetylpyridinium bromide (CPB) was used to prepare SMZ. The characterization methods by means of powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscope (SEM) showed that both the surface and internal zeolite were covered with CPB molecules, but the main binding sites were surface. Results showed that the organic carbon and cation exchange capacity of the SMZ were 7.76 times and 4.22 times higher than those of natural zeolite (NZ), respectively. Zeta potentials before and after modification were measured at -7.80 mV and -30.27 mV, respectively. Moreover, the saturation adsorptive capacity of SMZ was 16.35 times higher than NZ in mercury-containing wastewater. The possible mechanisms of mercury elimination were surface adsorption, hydrophobic interaction, ion exchange, electricity neutralization. The adsorption process was affected little by competitive ions.
authors.affiliation: College of Resources and Environment, Southwest University, Chongqing, 400716, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Liu
authors.forename: Hui
authors.initials: H
authors.lastname: Huang
authors.forename: Rong
authors.initials: R
authors.lastname: Huang
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Zhang
authors.forename: Shuoshuo
authors.initials: S
authors.lastname: Hao
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Shen
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D001965:Bromides / Q000737:chemistry*; D002594:Cetylpyridinium / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis*; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry
chemical_list: D001965:Bromides; D002594:Cetylpyridinium; D008628:Mercury; D013501:Surface-Active Agents; D062065:Wastewater; D017641:Zeolites