다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Copper removal from industrial wastewater: A comprehensive review

Advances in biopolymer-based membrane preparation and applications

Chitosan film incorporated with citric acid and glycerol as an active packaging material for extension of green chilli shelf life

Handbook of Dialysis

Adsorption of Hg(II) ions onto selective adsorbent of dithizone-immobilized natural zeolite (DIZ) from Wonosari, Yogyakarta, Indonesia has been investigated in batch mode. Some parameters influencing immobilization of dithizone and adsorption of Hg(II) were optimized including effect of temperature and reaction time on the effectiveness of dithizone immobilization as well as effect of pH, contact time and initial concentration of Hg(II) ion on the efficiency of the Hg(II) adsorption. Preliminary application of the adsorbent in the removal of Hg(II) ion in river water spiked with Hg(II) was also studied. The FT-IR and XRD analytical results show that the surface of natural zeolite can be modified by immobilization of selective organic ligand towards Hg(II) ions. The optimum conditions for the adsorption of Hg(II) is achieved at pH 5 and 90 min of contact time. Kinetics and adsorption isotherm studies suggest that the capacity, affinity and selectivity of the DIZ in adsorbing hazardous metal ions such as Hg(II) is significantly improved compared to those of non-immobilized activated natural zeolite (AZ). The Hg(II) adsorption capacity for AZ and DIZ at optimum condition is 8.0 and 13.1 μmol/g, respectively and the both adsorption follows first-order reaction. It has also been demonstrated that the DIZ adsorbent may be applied in the removal of Hg(II) ion in the river water spiked with Hg(II) ion up to 99.36% from the initial concentration of 8 mg L −1 in two serial batch adsorptions.

Adsorption of mercury(II) on dithizone-immobilized natural zeolite

Aims: To study the photocatalytic method for decreasing the concentration of Cu(II), Cd(II), Cr(VI), and Pb(II) in the solutions. Study Design: The photocatalytical process was proceeded for single solutions containing respective Cu(II), Cd(II), Cr(VI), and Pb(II) ions. Reaction time, photocatalyst dose, and solution pH were optimized. The influence of Cr(VI), Cd(II) and Pb(II) ions on the Cu(II) removal was also evaluated. Place and Duration of Study: Laboratory of Analytical Chemistry, Chemistry Department, Gadjah Mada University, Indonesia. June 2013 – January 2014. Methodology: Photocatalytic process was carried out by irradiating 100 ml of 4 single solutions containing 10 mg/L of Cu(II), Cd(II), Cr(VI) and Pb(II) added with TiO2 with UV lamp having 290390 nm of the wavelength, for certain time. The same procedure was also taken place with variation of photocatalyst dose (10, 25, 50, 75, and 100 mg for 100 ml solution), irradiation time (1, Original Research Article Wahyuni et al.; ACSj, 5(2): 194-201, 2015; Article no.ACSj.2015.019 195 3, 5, 10, 25, 50, and 75 h), and solution pH (1, 3, 5, 7, 9, and 13), and for 3 solutions containing Cu(II), that was added with Cd(II), Cr(VI), and Pb(II) respectively. The concentrations of Cu(II), Cd(II) and Pb(II) ions in the solutions were measured by AA Spectrophotometer and by spectrophotometer UV-Visible for Cr(VI) ion. Results: The maximum effectiveness of the photocatalytic process can be obtained by using 50 mg of TiO2, in 24 h and at pH 5, that can take Cu(II), Cr(VI), Cd(II) and Pb(II) out from the solutions as high as 45.56%, 77.72%, 15.23%, and 40.32%, by photocatalytic reduction, adsorption on TiO2 and photocatalytic oxidation, respectively. The presence of Cr(VI) and Cd(II) can decrease Cu(II) photo reduction from 45.36% into 15.24% and into 40.53%, meanwhile Pb(II) improves the photo reduction from 45.56 into 58.76% for low Pb(II) concentration. Conclusion: The concentration of the toxic Cu(II) and Cr(VI), Cd(II), and Pb(II) ions can be successfully decreased by photocatalytic process through different mechanisms. The removal of the metal ions was controlled by photocatalyst dose, irradiation time, and solution pH. The presence of Cr(VI) and Cd(II) can inhibit Cu(II) photoreduction due to the competition, meanwhile Pb(II) with low concentration promotes Cu(II) photoreduction by synergic effect.

Removal of Toxic Metal Ions in Water by Photocatalytic Method

Permeability improvement of polyethersulfone-polietylene glycol (PEG-PES) flat sheet type membranes by tripolyphosphate-crosslinked chitosan (TPP-CS) coating.

Colorimetric analysis of heavy metal ions can be realized by the aid of Ag nanoparticles to improve the analytical characteristics. The method is based on the localized surface plasmon resonance (LSPR) properties of the Ag nanoparticles (AgNPs). In this work, we applied the AgNPs with the addition of dithizone to further improve the selectivity and sensitivity of Pb2+ analysis. Colorimetric sensing of Pb2+ ions based on the polyvinyl alcohol (PVA)-stabilized-colloidal AgNPs in the presence of dithizone is reported. A linear decrease in the AgNPs LSPR absorbance at 421 nm was observed along with the increase in the Pb2+ concentration in the range of 0.50–10 µg/L. The other ions give a minor change in the LSPR absorbance of colloidal AgNPs. The Pb2+ limit of detection, the limit of quantification, and sensitivity were found to be 0.64 ± 0.04 µg/L, 2.1 ± 0.15 µg/L, 0.0282 ± 0.0040 L/µg (n = 5), respectively. The obtained sensitivity is comparable with that of the immunosensing method. The proposed method could offer a good alternative for colorimetric analysis of Pb2+ ions by using nanoparticles in the presence of ligands, which can improve selectivity.

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Mudasir Mudasir

Papers

Adsorption of mercury(II) on dithizone-immobilized natural zeolite

Removal of Toxic Metal Ions in Water by Photocatalytic Method

Permeability improvement of polyethersulfone-polietylene glycol (PEG-PES) flat sheet type membranes by tripolyphosphate-crosslinked chitosan (TPP-CS) coating.

Colorimetric Sensing of Pb2+ Ion by Using Ag Nanoparticles in the Presence of Dithizone

In vitro hemocompatibility of PVA-alginate ester as a candidate for hemodialysis membrane.