ABSTRACT This review discussed the last 10 years progress in use of lignocellulosic materials chemically modified as low‐cost biosorbents. Thus, chemical modifications, such pretreatment, oxidation, well grafting carboxyl groups, amines, amides, etc., on fibers, that aim to increase number adsorption sites and maximize toxic metal ion capacity have been addressed. The literature presents results indicated performances biosorbents equal or even higher than conventional methods adsorbents....

Ethylenediaminetetraacetic acid (EDTA) functionalized silica spheres were used to remove metal ions from aqueous solutions. The adsorption kinetics of Cu2+, Zn2+, and Cd2+ (60 mg·L–1, pH 5.5) fitted the pseudosecond order model. Adsorption equilibria reached within 20 min, indicating that chemisorption may be limiting step in process. isotherms analyzed with nonlinear models by considering ERRSQ error function determination coefficient R2. data monoion solutions (10 mg·L–1 300 mg·L–1) tested...

ABSTRACT This work investigates the removal of Cd 2+ , Cu Ni and Pb ions from aqueous solutions using tururi fibers as an adsorbent under both batchwise fixed‐bed conditions. It was found that modification with sodium hydroxide increased adsorption efficiencies all metal studied. The fractional factorial design showed pH, mass, agitation rate, initial concentration influenced each differently. kinetics multi‐element equilibria were reached after 15 min following pseudo‐second‐order kinetics....

AbstractThis work investigates copper, nickel and zinc ion biosorption in single- multi-component systems a fixed-bed column using green coconut shells (CS). Approximately 85% of biosorbents are particle size ranging from 0.25 to 2 mm. Operational parameters selected include flow rate 200 mL min−1 bed height 100 cm, which were for shorter execution time good adsorption capacity. Empty-bed contact Thomas models applied, showing fit with the experimental data. The capacity increased after CS...

The potential to remove Cu2+ ions from aqueous solutions through biosorption using roasted barley powder and alkalized was investigated in batch experiments fixed-bed columns. influences of initial concentrations (40 600 mg/L) the metal ion, amount adsorbent (0.01 0.25 g), contact time (2 240 min), pH (1.0 5.5) were all studied. An isotherm model applied describe equilibrium. percentage adsorption increased with increasing pH-values up 5.5 dosage 0.1 g. equilibrium capacities after 3hours...

ABSTRACT The adsorption of Cu (II) from aqueous solutions using coconut shell modified powder was investigated in batch experiments. surface charge the adsorbent determined. points zero (PZC) adsorbents (pH PZC ) were 4.5, 2.0, and 2.0 to raw (RC), alkalized (RCA), with tannic acid (TCA) adsorbent, respectively. Batch experiments performed under kinetic equilibrium conditions. data analyzed a pseudo second‐order, Elovich equation. Adsorption Langmiur, Freundlich, Temkin, Dubinin–Raduschevich...

Buriti fibers were subjected to an alkaline pre-treatment and tested as adsorbent investigate the adsorption of copper, cadmium, lead nickel in mono- multi-element aqueous solutions, results showed increase capacity compared unmodified fiber. The effects pH, mass, agitation rate initial metal ions concentration on efficiency process studied using a fractional 2(4-1) factorial design, that all four parameters influenced differently. Fourier transform infrared spectrometry X-ray fluorescence...

A numerical and experimental study of the multielement adsorption Cd2+, Cu2+, Ni2+, Pb2+ metal ions in batch column system were carried out aqueous solution using Tururi fibers as adsorbent. The kinetics thermodynamic equilibrium parameters studied. was fitted to homogeneous diffusion model results showed good linear correlation coefficients. Furthermore, a mathematical built describe mass transfer for fixed bed tests. effects constant equilibrium, external transfer, intraparticle resistance...

Adsorption assays indicated that the pseudostem banana fibers are an efficient sorbent for removal of safranin from aqueous solution being dependent on pH, dye concentration, and temperature. Kinetics thermodynamic studies Sips isotherm as most suitable model to describe studied adsorption process, which occurs through a pseudo second-order process. The parameters sorption onto fiber is spontaneous (ΔGads ≅ –30 kJ mol−1) exothermic (ΔHads –17 mol−1).

In this study, the adsorption efficiency of cashew peduncle bagasse (CPB) is reported for removal single-(mono-) and multi-metal ions (Cd2+; Cu2+; Ni2+; Pb2+; Zn2+) from synthetic natural effluents using fixed-bed columns. The percentage saturation realised in study a mono-elemental system was as follows: Pb2+ > Cd2+ Zn2+ Ni2+ Cu2+. metal ion recovery rate determined by column elution; we demonstrated 100% 40 mL HCl or HNO3 (0.1 mol L−1) eluent, with exception Pb2+. adsorbent regeneration...

Most galvanic process industries treat their effluents by chemical precipitation methods. Such a method produces an amount of sludge that is often disposed inappropriately to the environment, causing major environmental damage. These rejects present high concentrations toxic metallic ions, such as copper (Cu(II)), lead (Pb(II)), nickel (Ni(II)), and cadmium (Cd(II)). Several alternatives have been proposed contribute in cheaper efficient way these effluents. This study aimed describe results...

ABSTRACT The present study aimed at verifying the acid surface modification of dry bean pods subjected to alkaline pretreatment using tannic acid, poly(acrylic acid), and poly(acrylamide‐ co ‐acrylic acid) evaluate their performances as adsorbents in metal ions removal. Factorial design was used a tool variables that affects processes. results showed there an increase adsorption capacity after acidic changes, mainly for achieving 45% increasing removal all ions. variable pH had negative...

Microplastics (MPs) in the environment pose a persistent concern, as these plastic particles can adversely impact both aquatic ecosystems and human health. MPs are subject to natural weathering aging processes, such photodegradation, which significantly alter their surface morphology physicochemical properties, thereby influencing fate, transport, sorption behavior. To better understand how affects properties elucidate mechanisms behind interactions with chlorpyrifos pesticide, poly(ethylene...

Sugar cane spirits are some of the most popular alcoholic beverages consumed in Cape Verde. The sugar spirit industry Verde is based mainly on archaic practices that operate without supervision and efficient control production process. objective this work was to evaluate samples industrial alembic from Ceará, Brazil using principal component analysis. Thirty-two were analyzed, twenty regions islands twelve Brazil. Of obtained seven five spirits. components analyzed these studies included...

The aim of the present work was to investigate adsorption toxic metal ions copper, nickel and zinc from aqueous solutions using low cost natural biomass (sugar cane bagasse green coconut fiber) in pilot scale fixed-bed system. Hydraulic retention time (HRT) 229 minutes lowest adsorbent usage rate (AUR) found 0.10 g.L -1 for copper fibers. highest values capacities founded were 1.417 2.772 mg.g Cu(II) sugarcane fibers, respectively. results showed that both fiber presented potential removal...

Perfumes are products mainly consisting of ethyl alcohol, water and fragrance.These fragrances responsible for characterizing the pleasant unique odor each perfume.Among fragrances, we highlight a group which can cause contact allergy, leading to dermatitis.Brazilian European law state that when these concentrations allergenic exceed limit 0.01% non-rinse 0.001% with rinsing, manufacturer is obliged discriminate on its label their presence.This work aims quantify allergic in original...

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