Composite beads composed of chitosan (CS) with different carbon nanotubes (CNTs) were prepared by the incorporation of single‐walled carbon nanotubes (SWCNTs), multiwalled carbon nanotubes (MWCNTs), and carboxylic multiwalled carbon nanotubes (MWCNT‐COOHs). A protected crosslinking method was used for the preparation of the CS/CNTs beads by the reaction of the beads with Hg(II) as the protector. Scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis were used to characterize the prepared beads. The adsorption performance of the prepared beads was investigated for the removal of Hg(II). The results show that beads prepared by the protected crosslinking technique removed 2.5 times more Hg(II) from solution than beads prepared by normal crosslinking. The maximum Hg(II) removal values were 148.7, 183.2, 167.5, and 172.7 mg/g by CS, MWCNT‐COOH‐impregnated CS beads, MWCNT‐impregnated CS beads, and SWCNT‐impregnated CS composite beads, respectively. The optimum removal conditions were pH = 4, contact time = 40 min, and temperature = 70°C. The equilibrium adsorption isotherm data of the beads exhibited a better fit to the Langmuir isotherm model. The reusability of Hg(II) sorption by the prepared beads was investigated to evaluate their repeated availability performance in water treatment. Quantitative removal of mercury from industrial wastes was demonstrated. A statistical analysis of the replacement cost of these sorbents revealed that SWCNTs, MWCNTs, and MWCNT‐COOH could possibly be cost‐effective sorbents in water treatment, regardless of their high unit cost at this time. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

The groundwater quality deterioration is a global phenomenon due to the effect of contaminated surface water. This study covers the investigation of groundwater quality using the contamination indices, statistical analysis, and hydrochemical facies. Thirty-one water samples that representing the water resources in the study area were collected and analyzed for chemical compositions. There are two aquifers; Pleistocene and Miocene. From the obtained data, the electric conductivity (EC) values ranged from 8520 to 19410 μS/cm in Pleistocene aquifer. While in Miocene aquifer, it ranged from 4290 to 7920 μS/cm. The wide variation is due to interaction with aquifer rocks. The hydrochemical facies evolution diagram (HFE-D) indicated that the majority of samples belong to an intrusion phase; the Na-Cl facies represents the state of the aquifer and the remaining sample is scattered in the eld of freshening. The dominance of average cations is about Na + > Mg 2+ > Ca 2+ > K + , where the anion dominance average is in the imperative of Cl − > SO 4 2− > HCO 3 -. Multivariate statistical techniques, such as cluster analysis (CA) and factor analysis (FA) showed contamination with heavy metal and fecal due to the in uence of the sewage treatment plant. The spatial distribution of heavy metal pollution index (HPI), Ecological risk index (ERI) and pollution index of groundwater (PIG), in the southeastern portion of the research, revealed high values near the center and particularly in the northwest portion of the study region. It demonstrated that water in the northeast of the study area is likely to be in uenced by heavy metal leaching from the water treatment plant.Highlights 1-Assess the quality of surface and groundwater 2-Hydrochemical data are described for both groundwater and surface water samples.3-Heavy metal pollution index is used for overall water quality determination 4-Cluster analysis is a statistical analysis used in grouping samples in clusters 5-hydrochemical facies diagram is used for the determination of seawater intrusion

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