Author
Nuria Miralles
Bio: Nuria Miralles is an academic researcher from Polytechnic University of Catalonia. The author has contributed to research in topics: Extraction (chemistry) & Amberlite. The author has an hindex of 26, co-authored 50 publications receiving 2472 citations.
Papers
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TL;DR: In this paper, the effect of contact time, solution pH, ionic medium and initial metal concentration were studied in batch experiments at room temperature, and the results showed that olive stone waste, which has a very low economical value, may be used for the treatment of wastewaters contaminated with heavy metals.
446 citations
TL;DR: Sorption of copper and nickel on grape stalks released an equivalent amount of alkaline and alkaline earth metals (K+, Mg2+, Ca2+) and protons, indicating that ionic exchange is predominantly responsible for metal ion uptake.
438 citations
TL;DR: From the results obtained it seems that other mechanisms, such as surface complexation and electrostatic interactions, must be involved in the metal sorption in addition to ion exchange.
330 citations
TL;DR: In this paper, the ability of cork and yohimbe bark wastes to remove Cu(II) and Ni(II), from aqueous solutions has been studied The influence of pH, sodium chloride and metal concentration on metal uptake was investigated Metal uptake showed a pH-dependent profile Maximum sorption for both metals was found to occur at around pH 6-7 In the case of Cork an increase of sodium chloride concentration provoked a decrease in metal removal.
Abstract: In this work the ability of cork and yohimbe bark wastes to remove Cu(II) and Ni(II) from aqueous solutions has been studied The influence of pH, sodium chloride and metal concentration on metal uptake was investigated Metal uptake showed a pH-dependent profile Maximum sorption for both metals was found to occur at around pH 6–7 In the case of cork an increase of sodium chloride concentration provoked a decrease in metal removal Adsorption isotherms at the optimum pH were expressed by the non-competitive Langmuir adsorption model, and model parameters were determined It was seen that the adsorption equilibrium data fitted very well to the model in the concentration range studied When comparing both biomaterials, yohimbe bark waste was found to be the most efficient adsorbent for both metals studied
© 2000 Society of Chemical Industry
128 citations
TL;DR: The EG Silicone coating enabled more efficient extraction of some polar compounds as well as improving the sorption of apolar compounds, in comparison with the other two coatings.
84 citations
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TL;DR: Control of the growth kinetics of the II–VI semiconductor cadmium selenide can be used to vary the shapes of the resulting particles from a nearly spherical morphology to a rod-like one, with aspect ratios as large as ten to one.
Abstract: Nanometre-size inorganic dots, tubes and wires exhibit a wide range of electrical and optical properties1,2 that depend sensitively on both size and shape3,4, and are of both fundamental and technological interest In contrast to the syntheses of zero-dimensional systems, existing preparations of one-dimensional systems often yield networks of tubes or rods which are difficult to separate5,6,7,8,9,10,11,12 And, in the case of optically active II–VI and III–V semiconductors, the resulting rod diameters are too large to exhibit quantum confinement effects6,8,9,10 Thus, except for some metal nanocrystals13, there are no methods of preparation that yield soluble and monodisperse particles that are quantum-confined in two of their dimensions For semiconductors, a benchmark preparation is the growth of nearly spherical II–VI and III–V nanocrystals by injection of precursor molecules into a hot surfactant14,15 Here we demonstrate that control of the growth kinetics of the II–VI semiconductor cadmium selenide can be used to vary the shapes of the resulting particles from a nearly spherical morphology to a rod-like one, with aspect ratios as large as ten to one This method should be useful, not only for testing theories of quantum confinement, but also for obtaining particles with spectroscopic properties that could prove advantageous in biological labelling experiments16,17 and as chromophores in light-emitting diodes18,19
4,288 citations
TL;DR: In this review, an extensive list of plant wastes as adsorbents including rice husks, spent grain, sawdust, sugarcane bagasse, fruit wastes, weeds and others has been compiled and some of the treated adsorbent show good adsorption capacities.
1,663 citations
TL;DR: The purpose of this paper is to review the available information on various attributes of utilization of microbial and plant derived biomass and explores the possibility of exploiting them for heavy metal remediation.
1,466 citations
TL;DR: The heavy metal adsorption capacities for these modified cellulose materials were found to be significant and levels of uptake were comparable, in many instances, to both other naturally occurring adsorbent materials and commercial ion exchange type resins.
1,127 citations
TL;DR: In this article, low-cost byproducts from agricultural, household and industrial sectors have been recognized as a sustainable solution for wastewater treatment, which allow achieving the removal of pollutants from wastewater and at the same time to contribute to the waste minimization, recovery and reuse.
1,105 citations