Author
Luiza N.H. Arakaki
Other affiliations: State University of Campinas
Bio: Luiza N.H. Arakaki is an academic researcher from Federal University of Paraíba. The author has contributed to research in topics: Silica gel & Adsorption. The author has an hindex of 20, co-authored 44 publications receiving 1149 citations. Previous affiliations of Luiza N.H. Arakaki include State University of Campinas.
Papers
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TL;DR: Vermiculite, a 2:1 clay mineral, was applied as adsorbent for removal of cadmium, zinc, manganese, and chromium from aqueous solutions and showed good sorption potential for these cations.
166 citations
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01 May 2005TL;DR: The natural highly charged lamellar silicate vermiculite was investigated as an exchanger matrix in doubly distilled water solution to exchange magnesium inside the lamella with the heavy cations copper, nickel, cobalt, and lead at the solid/liquid interface, indicating a difficulty of the less hydrated cation, lead, in exchanging with magnesiuminside the lameLLar space.
Abstract: The natural highly charged lamellar silicate vermiculite was investigated as an exchanger matrix in doubly distilled water solution to exchange magnesium inside the lamella with the heavy cations copper, nickel, cobalt, and lead at the solid/liquid interface. The extension of each exchange reaction was dependent on time of reaction, pH, and cation concentration. The maximum time presented the following order Pb2+ N f , which gave values 0.59, 0.76, 0.84, and 0.93 mmol g−1 for Pb2+
111 citations
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TL;DR: The degree of adsorption obtained from batchwise processes showed the best performance of these synthesized nanomaterials when compared with the pristine hydroxyapatite.
74 citations
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TL;DR: The new modified silica showed a good sorption ability for copper at lower temperatures and its reuse capacity was demonstrated and infrared and (13)C NMR spectroscopic data in conjunction with thermogravimetric measurements are in agreement with the suggested functionalization.
66 citations
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TL;DR: In this article, the precursor silylating agent 3-mercaptopropyltrimethoxysilane (mts) was first grafted onto silica gel and then condensed to one molecule of ethylenimine (etn).
60 citations
Cited by
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01 Dec 1991
TL;DR: In this article, self-assembly is defined as the spontaneous association of molecules under equilibrium conditions into stable, structurally well-defined aggregates joined by noncovalent bonds.
Abstract: Molecular self-assembly is the spontaneous association of molecules under equilibrium conditions into stable, structurally well-defined aggregates joined by noncovalent bonds. Molecular self-assembly is ubiquitous in biological systems and underlies the formation of a wide variety of complex biological structures. Understanding self-assembly and the associated noncovalent interactions that connect complementary interacting molecular surfaces in biological aggregates is a central concern in structural biochemistry. Self-assembly is also emerging as a new strategy in chemical synthesis, with the potential of generating nonbiological structures with dimensions of 1 to 10(2) nanometers (with molecular weights of 10(4) to 10(10) daltons). Structures in the upper part of this range of sizes are presently inaccessible through chemical synthesis, and the ability to prepare them would open a route to structures comparable in size (and perhaps complementary in function) to those that can be prepared by microlithography and other techniques of microfabrication.
2,591 citations
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TL;DR: Increased utilization of mechanically stable synthetic matrices particularly silica gel as a solid support and its surface modification by impregnation of organic ligands directly or covalent grafting through spacer unit for extractive concentration of trace elements are highlighted in the present article.
860 citations
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TL;DR: Thermodynamic parameters showed that the adsorption process was spontaneous, endothermic and chemical in nature, and the MNP-NH(2) sorbent was able to remove 98% of Cu(2+) from polluted river and tap water.
529 citations
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TL;DR: A discussion on the adsorption mechanism with respect to the double-exponential model leads to two possible interpretations: the metal uptake may follow a diffusion-controlled mechanism or a two-site Adsorption process.
469 citations
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TL;DR: This work critically reviews existing knowledge and research on the uptake of nickel and zinc by natural and modified zeolite, bentonite and vermiculite, and focuses on the examination of different parameters affecting the process, system kinetics and equilibrium conditions.
418 citations