Abstract Cashew nut shell (CNS) is an agricultural waste was investigated as a new adsorbent for the removal of zinc(II) from aqueous environment. Effects solution pH, CNS dose, contact time, initial concentration and temperature on efficiency were tested optimum conditions evaluated. The equilibrium data fitted well with Langmuir isotherm model pseudo‐second‐order kinetic model. monolayer adsorption capacity examined 24.98 mg/g. Changes in standard Gibbs free energy (▵ G °), enthalpy H °)...

Abstract A low cost adsorbent prepared from material of biological origin Setaria verticillata (Grasses) has been utilized as an for the removal Reactive Yellow 15 (RY15) dye aqueous solution. The combined effect initial pH, dose, and concentration was investigated using Response Surface Methodology (RSM). most influential adsorption factor on each experimental design response identified Analysis Of Variance (ANOVA). values percentage were found to be in good agreement with predicted values....

The adsorption studies of poly(6-(ethoxybenzothiazole acrylamide) (PEBTA), for Cu(II) and Zn(II) metal ions removal from an aqueous solution have been investigated, as a function pH, adsorbent dose, contact time, initial ion concentration temperature. chemical structural characteristics the were determined by FT-IR, 1H-NMR, TGA, SEM, EDAX analysis. maximum capacities ions, calculated Langmuir isotherm model, 273.5 216.4 mg/g, respectively. kinetic show that onto PEBTA follows pseudo second...

Abstract We report the fluorescence quenching of sulforhodamine 640 (SR 640) supported on graphene oxide (GO) and boron nitride (BN) nanosheets (NSs). The synthesis characterization both materials are described. X‐ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), transmission scanning electron (TEM SEM), Brunauer–Emmett–Teller (BET) method were used. photophysical properties, such as lifetime anisotropy SR dye over synthesized materials, reported. observed GO BN...

Abstract We used a novel approach to purify Pleurotus ostreatus laccase using the three phase partitioning (TPP) methodology. The aim of our research was study effect TPP parameters on purity and yield. response surface methodology (RSM) has been applied design experiments evaluate interactive effects most important operating variables: ammonium sulphate saturation (w/v) (20–80%), ratio crude extract t-butanol (v/v) (1:1 1:3), temperature (20–60°C). Using this methodology, optimum values for...

Removal of Cr(VI) ions from aqueous solution was investigated using activated carbon obtained acid modified (AMCAC) and unmodified corncorb (UMCAC) by batch adsorption technique at 30°C. H 2 SO 4 10 N , 20 30 concentrations were used for the modification carbon. The effect different parameters, such as pH, initial ion concentration, contact time, adsorbent dosage studied. effective maximum removal pH 6.0, equilibrium attained in 60 min. Kinetic studies show that pseudo‐second‐order kinetic...

Abstract Aromatic polyamides and polythioamides with pendent chlorobenzylidine rings were synthesized through direct polycondenzation of 2‐( p ‐chlorobenzalimino) terephthalic acid the diamines 4,4′‐oxidianiline (1a), 4,4′‐methylenediamide (1b), 4,4′‐diaminodiphenyl sulfone (1c), thioamines 4,4′‐(bisthiourea) diphenyl ether (3a), methane (3b), (3c), respectively, in DMF using P(OPh) 3 /pyridine. The polymers precipitated water as nonsolvent. FTIR 1 H‐NMR spectroscopic analysis was used to...

A series of novel ladder-type poly(azomethine amide)s (PAMs) were prepared from new azomethine containing carboxylic acid monomer (TCA) with simple aromatic diamines and thiourea groups (TDAs) by means phosphorylation polycondensation reaction. Molecular weights the polyamides evaluated viscometrically, inherent viscosities in range 0.31 - 0.58 g/dl. These polymers not freely soluble common organic solvents. Structure monomers confirmed using FT-IR, 1H-NMR 13C-NMR spectroscopic analysis....

Novel polyamides bearing pyridyl and azomethine groups as pendant pyridylformylimino along with thioamide moieties in the polymer backbone were synthesized using 4-pyridylformylimino-N-(phenyl,2′,5′-dicarboxylic acid) 4,4′-(bisthiourea)benzidine 4,4′- diaminodiphenyl methane through one pot phosphorylation polymerization technique. The optimization of experimental conditions parameters including pH, adsorbent dosage, contact time, initial metal ion concentration for removal heavy has also...

Batch adsorption studies were carried out for the removal of cadmium ion (Cd2+ ion) and methyl red (MR) from aqueous solutions using poly(azomethinethioamide) (PATA) resin which is having pendent chlorobenzylidine ring. PATA was characterized by FT-IR spectroscopy, NMR transmission electron microscope (TEM), scanning (SEM) techniques. Parameters like pH, initial dye metal concentration, adsorbent dose, contact time have been studied. Maximum observed at pH 6 Cd2+ 7 MR. Langmuir, Freundlich,...

Acid Modified Activated Carbon (AMAC) was prepared by the chemical activation of corncob with 10 N sulphuric acid that can be used in Ni 2+ and Pb ions removal applications. The effect adsorption experimental parameters such as solution pH, adsorbent dose, contact time, initial metal ion concentration, temperature studies on investigated. data obtained from concentration were fitted Langmuir, Freundlich, Redlich‐Peterson isotherm models, using MATLAB R2009a. Similarly, time evaluated...

Heavy metal pollution is a serious environmental issue worldwide with rapid increase in global industrial activities (Podder and Majumder [2016]: Water Conserv Sci Eng 1, 103–125). In this study, aromatic polyamide (PA) containing the azomethine group (Vidhyadevi et al. [2012]: Sep Technol 48, 1450–1458) was used as an adsorbent for individual simultaneous adsorption of Ni (II), Cd Zn (II) ions from their aqueous solutions. Equilibrium, kinetic, thermodynamic analyses were also carried out....

This article reports the removal of Pb(II) ions from aqueous solution by surface modified Guazuma ulmifolia (SMGU) seeds as an adsorbent and this material was prepared treating with sulphuric acid. The effectiveness SMGU has been investigated a function pH, dose, contact time, initial ion concentration. adsorption favored maximum at pH 6.0. equilibrium attained within 60 min. experimental data were analyzed using Langmuir Freundlich isotherm equations. fit wellthe isotherm. four kinetic...

AbstractThe adsorption of Ni(II) ion from an aqueous solution was successfully carried out using activated carbon prepared Theobroma cacao (cocoa) shell, agricultural solid waste biomass. The at ambient temperature (TCAC1) and the one 350 °C (TCAC2) were characterised by FT-IR, BET, SEM, EDAX Particle size analysis methods. effects pH, dosage, initial metal concentration agitation time studied. maximum observed pH 6 equilibrium attained within 60 min. Adsorption isotherm data have been...

The removal of Congo Red (CR) from an aqueous solution, using aromatic polythioamide resin (PTA) was studied. effective pH and equilibrium time for the maximum adsorption CR on PTA is found to be 7 45 min, respectively. Among three kinetic models studied, pseudo-second order model describes efficiently. capacity calculated Langmuir isotherm 452.1 mg/g. surface morphology dye adsorbed were determined scanning electron microscopy. efficiency retained even after four cycles.

Abstract This paper reports the application of poly(azomethinethioamide) (PATA) resin having pendent chlorobenzylidine ring for removal heavy metal ions such as Zn(II) and Ni(II) from aqueous solutions by adsorption technology. Kinetic, equilibrium thermodynamic models were applied considering effect contact time, initial ion concentration temperature data, respectively. The influencing parameters maximum optimized. Adsorption kinetic results followed pseudo-second order model based on...

Abstract Biodiesel is one of the alternative fuels that can help in reducing oil dependence. β‐Zeolite was modified with phosphoric acid and β‐zeolite used as catalyst for esterification free fatty acids (FFA) present pinnai its effect on reaction studied. Influence amount, methanol to ratio temperature specific rate modelled using Langmuir–Hinshelwood (LH) kinetics, pseudo first order kinetics Arrhenius equation, respectively. The kinetic constant values obtained LH show adsorption capacity...

A novel poly [2,5-(1,3,4-thiadiazole)-benzalimine] abbreviated as TDPI adsorbent was synthesized using simple polycondensation technique. The synthetic route involves the preparation of 2,5-diamino-1,3,4-thiadiazole from 2,5-dithiourea and subsequent condensation with terephthalaldehyde. resin chemically characterized Fourier transform infrared (FT-IR), 1H-NMR, 13C-NMR spectroscopic analysis. Surface morphology thermal stability were analyzed scanning electron microscopy (SEM)...