In the present study biosorption characteristics of Cd (II) and Zn ions from monocomponent aqueous solutions by Agaricus bisporus macrofungus were investigated. The initial metal ion concentrations, contact time, pH temperature parameters that influence biosorption. Maximum removal efficiencies up to 76.10% 70.09% (318 K) for (II), respectively adsorption capacities 3.49 2.39 mg/g at highest concentration, calculated. experimental data analyzed using pseudo-first- pseudo-second-order kinetic...

The aim of this study is to investigate and develop a phytoremediation method for the removal two triphenylmethane dyes (crystal violet malachite green) using an aquatic plant, Lemna minor. effects operational parameters such as plant quantity, initial dye concentration, pH solutions temperature medium were studied in order determine optimum conditions. plant's photosynthetic pigments determined quantitatively detect response abiotic stress. During experiments parallel sub-processes...

The biosorption characteristics of Cd (II) ions from synthetic wastewater using raw Ayous wood sawdust (Triplochiton scleroxylon), r-AS, immobilized by sodium alginate were investigated with respect to pH, biomass quantity, contact time, initial concentration heavy metal, temperature and stirring rate. experimental data fitted well the Langmuir isotherm, suggesting that monolayer adsorption cadmium onto alginate-Ayous composite (a-ASC). obtained capacity a-ASC for was 6.21 mg/g. From...

Abstract Two treatments, sodium hydroxide and hydrogen peroxide, were applied to enhance the capacity of fir tree (Abies alba) sawdust adsorb Cd(II). Fourier transform infrared spectroscopy (FTIR) analysis atomic force microscopy (AFM) used characterize untreated treated sawdust. The removal Cd(II) ions by was dependent on initial concentration, pH, temperature. Kinetics (pseudo-first-, pseudo-second-order, intra-particle, film diffusion models) isotherm models (Langmuir Freundlich)...

Abstract This work investigates the possible usage of edible mushrooms as support for metabolic quantities copper. Biosorption potential natural and biodegradable matrix formed from wild Lactarius piperatus mushrooms, in suspension (LP) alginate immobilized based beads (LPAB), was explored. The effects biomass quantity, Cu(II) concentration, temperature were assessed. LPAB showed better adsorption capacity (7.67 mg/g) by comparison to LP biosorbent (6.43 mg/g). Also, biosorption efficiencies...

In this study, biosorption of cadmium (Cd) (II) and zinc (Zn) ions from synthetic wastewater was investigated using Lactarius piperatus macrofungus biomass in batch conditions. The presence amino, carboxylic, sulfonate, phosphate groups identified along with shifts decreased intensities the main peaks (Fourier transform infrared spectroscopy), deformations cell walls after heavy metals (scanning electron microscopy) were observed. effects stirring rate, quantity, initial metal ion...

The adsorption of malachite green (MG) from aqueous solution by waste tea (WGT) biomass was investigated. A series experiments in batch conditions were conducted order to assess the MG removal on WGT, following adsorbent quantity and temperature influences. Maximum efficiency for untreated WGT 89% (4 g biomass, 100 mL 94 mg/L, 316 K). It found that increased increasing 296 K. Thermodynamic parameters (ΔHº, ΔSº, ΔGº) calculated, indicated dye onto studied endothermic non-spontaneous. Six...

In this investigation, the removal of Cd2+ ions by a brewery waste biomass in immobilized (Ca-alginate beads) form was studied. The process conducted at room temperature under batch conditions (magnetic stirring) using different initial cadmium concentrations. equilibrium biosorption reached 150 minutes for all employed maximum capacity calculated to be 5.96 mg g-1 yeast an concentration 169 L-1. Langmuir and Freundlich adsorption isotherms were used correlate data. Based on correlation...

The present study investigates the biosorption of cadmium ions from aqueous solution onto unmodified, ultrasound and microwave treated cells Saccharomyces cerevisiae. FTIR analysis was conducted to characterize biosorbent. Equilibrium kinetic studies unmodified RBW (residual brewery waste) cell yeast DSM 1333 (pure strain) were by considering effect initial concentration. Results showed that treatments decrease heavy metal uptake compared with biomass. Langmuir Freundlich isotherm models on...

Removal of malachite green (MG) onto fir (Abies nordmanniana) cones biomass (FCB) as a lingo-cellulosic-based structure material was investigated in the present study. Characterization FCB performed using Fourier transform infra red and scanning electron microscobe analyses. Several parameters (biomass dose particle size, dye concentration, temperature, pH) were to determine optimal working conditions. Subsequently, yelded qe 2.2 mg/g for 50 g/L FCB, an MG solution 110 mg/L, pH 3.3, at...

This paper presents a report on kinetics of malachite green (MG) dye removal from model aqueous solutions using biomaterial formed by corn cob activated carbon (CCAC).The sorbent was characterized specific surface area and pore size distribution (Brunauer-Emmett-Teller, BET) analysis.The BET analysis confirmed the macro-porosity adsorbent.Effects initial concentration MG CCAC quantity, particle stirring rate adsorption capacities efficiency were monitored through pseudo first-and...

Microwave action on adsorbed 2-(arylamino)-nicotinic acid derivatives allows to obtain, depending the pH of substrate, corresponding N-amino substituted pyridines by decarboxylation or naphthyridone cyclization reaction.

Abstract The preparation of novel alkyl monobridged 2,4‐dimethyl‐5‐amino‐benzo[ b ][1,8]naphthyiridine and benzo[ ][1,8]naphthyridone derivatives by phase transfer catalysis is reported.

This study includes the most important physico-chemical parameters monitoring of shallow wells from Sândominic commune, Harghita County, Romania, in order to establish if water sources can be used as drinking water.The pH, dHT, acidity, alkalinity, CCO-Mn, NO2 -, NO3 - , NH4 + Cl -and Fetotal were determined using appropriate standard methods and compared with allowable values for water, according Romanian legislation.Based on parameter values, samples characterized by a moderate or high...

The reduction of 3 -nitro -2 and 3,8 -dinitro-dibenzofurans 4 in biocatalvtic conditions, with Bakers' Yeast is discussed.Selective the nitro groups was observed.The structures compounds obtained through have been confirmed by spectral elemental analysis.

For this study, a natural ionic exchanger (zeolitic volcanic tuff) and synthetic anionic were considered, to remove iron manganese ions, reduce COD, chlorides conductivity values from water.It was worked with zeolitic tuff cropped out Macicas area, Romania, Amberlite A-21.A groundwater surface sources of drinking water Ialomiţa-Muntenia (Romania) catchment analysed, contents (0.2527-0.3059 mg Fetot/L, 0.0234 Mn/L), COD (14.530-17.064mg KMnO4/L), (170.95mg/L), pH=7.70, electrical 1433-1451...

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This paper presents a report about the extraction of resveratrol with ethanol (EtOH) from red grape pomace (RGP) Vitis vinifera L. (Cluj, Transylvania region, Romania) and obtaining dietary supplement zinc on support.The concentration (Rv) extract was spectrophotometrically determined at 305 nm wavelength, found to be 145 mg Rv/L.The material resulting after processed obtain thermodynamic parameters, including Gibbs free energy (ΔG°), enthalpy (ΔH°) entropy (ΔS°) Zn 2+ biosorption were...

Various lignocellulosic waste materials were assessed for their potential usage as biosorbents Cd(II) removal from wastewaters.Sunflower seed shells, carrot peel, bean pods, eggplant and orange peel in dry form different grain sizes evaluated.Contact time, initial concentration, biosorbent amount also tested.Eggplant was the most efficient with an experimental biosorption capacity of 9.33 mg/g, a monolayer (Langmuir) 18.05 maximum % yield 97.33%.Experimental data best fitted Langmuir...