AR Dye Research Articles

Adsorption of Alizarin Red S Dye by Carbon Nanotubes: An Experimental and Theoretical Investigation

This study evaluated the feasibility of removing Alizarin Red S dye (ARS) from aqueous solutions, using nanoadsorbents such as single and multiwalled carbon nanotubes (SWCNT and MWCNT, respectively). The effect of pH, shaking time, and temperature on adsorption was studied. The pH 2.0 was observed to show optimum removal for both of the carbon nanotubes. The equilibrium time (298–318 K) was fixed at 65 and 100 min for SWCNT and MWCNT, respectively. The kinetics of adsorption was calculated using pseudo-first-order, pseudo-second-order, and general-order equations. The calculations revealed that the general-order kinetic equation best-fit the adsorption data. The Liu isotherm model best fit the equilibrium data (298–318 K). The maximum sorption capacity at 318 K for ARS dye was 312.5 and 135.2 mg g–1 for SWCNT and MWCNT, respectively. Change in entropy (ΔS°), Gibb’s free energy change (ΔG°), and enthalpy (ΔH°) were calculated for the adsorption of ARS dye. The electrostatic interaction between nanoadsorben...

Low-cost sorbents for the removal of acid dyes from aqueous solutions

Abstract Two activated carbons (ACs) derived from apple wood (AWAC) and peach stone (PSAC), and one keratinous material extracted from hydrolyzed wool (WHA) were tested for their adsorption capacity for Acid Red 337 (AR) and 1:2 chromium complex of Acid Blue 349 (AB). A commercial granular activated carbon (GAC) was chosen as reference sorbent. The sorbent characteristics, the dye concentration, the contact time and the working pH were the factors taken into consideration. The SEM images of AWAC and PSAC show different morphologies and pore structures. FTIR spectra of the WHA material did not indicate any drastic disruption of keratin macromolecule. The AR dye exhibited higher uptake as compared with the AB dye for all sorbents. The sorption capacity of the tested materials increased in sequence: AWAC

Synthesis, characterization and drug release activity of poly(ε-caprolactone)/Fe3O4–alizarinred nanocomposites

Applications of magnetic and fluorescent poly(ε-caprolactone) (PCL) is increased rapidly in the biomedical engineering field as a bioimaging probe. This urged us to do the present work. In the present investigation, the role of Fe3O4–AR dye nanohybrid on the ring opening polymerization (ROP) of CL was studied at different experimental conditions such as variation in [M] and [M/I]. Prior to ROP of CL, the nanohybrid was characterized by various spectral methods like FTIR spectroscopy, UV–visible spectroscopy, fluorescence spectroscopy, VSM and FESEM like analytical techniques. The Fe3O4–AR nanohybrid is used as an initiator for the ROP of CL. After the formation of PCL/Fe3O4–AR nanocomposite again the systems were characterized by FTIR spectroscopy, UV–visible spectroscopy, fluorescence spectroscopy, DSC, VSM and FESEM like methods. The interesting point noted in the present investigation is the size of Fe3O4 nanoparticle was found to be reduced after the nanohybrid and nanocomposite formation. The three functional groups of AR dye were involved in the ROP of CL. The binding constant and number of binding sites were determined.

Electrospun BiOI nano/microtectonic plate-like structure synthesis and UV-light assisted photodegradation of ARS dye

Techtonic plate-like nano structures synthesized by electrospinning and were employed for photocatalytic degradation. The possible photodegradation has been explained based on the band edge position.

A kinetic study for the removal of anionic sulphonated dye from aqueous solution using nano-polyaniline and Baker’s yeast

In this study, a method for the removal of anionic sulphonated Acid Red 14 (AR) dye from aqueous solution using the chemical interaction of dye molecules with nano-polyaniline is reported. Nano-polyaniline (PANI) was synthesized by chemical oxidation in presence of different surfactants. The experimental observations from UV/Vis spectroscopy, rule out the possibility of secondary doping of polyaniline salt by AR14 molecules. A possible mechanism for the chemical interaction between the polymer and dye molecules is proposed. In order to get a better comparison, adsorption experiments were also carried out using Baker’s yeast (BY) individually and in mixture with nano-PANI. Kinetic parameters for the adsorption of AR dye on the selected adsorbents are also reported. It was found that application of BY with PANI for the removal of anionic sulphonated dyes such as AR dye from aqueous solution is very promising.

泌尿器科領域におけるレーザー治療の展望

Several kinds of laser, CO2, Ar, Nd: YAG, Ar dye, Pulsed dye and Diode lasers have been used for the skin incision, treatment of penile carcinoma and bladder tumor, urethral stenosis, stone destruction and acupuncture. Ar dye laser has been utilized as a photodynamic therapy (PDT) with the use of photosensitized agents (HpD). Though the PDT was evaluated as the ideal treatment of CIS, there still remains the problem to be solved in terms of the hypersensitivity of the skin by HpD. After the development of extracorporeal shock wave lithotripsy (ESWL), laser surgery was attempted to the endoscopic destruction of the ureteral stone. Pulsed dye laser is now commercially available. But more powerful laser is hoped to be developed without appreciable changes to the living tissue by the laser irradiation. Nd: YAG laser is able to transmit through quartz fiber, making it feasible to perform transurethral laser surgery. Therefore, special interests were focused in the treatment of bladder tumor and urethral stenosis. Because of the limited indication of Nd: YAG laser therapy, instrumental development and technical expertise will be needed to magnify the indication of the laser therapy.

Molecular Interaction between Merocyanine Dye and Several Kinds of Triphenyl Methane Derivatives in Langmuir-Blodgett Films

Several triphenyl methane derivatives (TPMs) having different substituents can be adsorbed from an aqueous solution to Langmuir films consisting of arachidic acid (AR) or a mixture of AR and merocyanine dye (MC). The substituent dependence of the adsorption phenomenon shows that the adsorption mechanisms of TPM to AR and MC are mainly due to charge-charge and dipole-dipole interactions, respectively. Moreover, a peculiar property such as a negative photoelectric effect was obtained in the dye-adsorbed Langmuir-Blodgett films.