Author
José G.P. Espínola
Bio: José G.P. Espínola is an academic researcher from Federal University of Paraíba. The author has contributed to research in topics: Adsorption & Silica gel. The author has an hindex of 15, co-authored 35 publications receiving 797 citations.
Papers
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TL;DR: In this paper, the synthesis, characterization and spectroscopic studies of Eu(III)-perchlorate complexes with amide ligands derived from N -[ x -methylpyridyl]acetamide where x = 3, 4 and 6.
165 citations
01 May 2005
TL;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
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
TL;DR: In this paper, the silylating agent 3-[2-(2-aminoethylamino)ethylaminos]propyl-trimethoxysilane was previously immobilized onto silica gel in heterogeneous route, followed by incorporation of thioglycolic acid.
44 citations
TL;DR: In this paper, two zinc silicate hybrids were synthesized via sol-gel process from the reaction of zinc ions with trialkoxyaminesilanes in aqueous basic medium at room temperature and at 373 K. The inorganic-organic hybrids obtained, named SILZn ( x = 1 or 2) are related to 3-aminopropyl- and N -propylethylenediaminetrimethoxysilane, respectively.
44 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
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
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
TL;DR: In this paper, a starch based nanocomposite (starch/SnO2) was synthesized and used as an effective adsorbent for the removal of Hg2+ from aqueous medium.
315 citations
TL;DR: In this paper, the activation energy of the adsorption process was calculated based on the pseudo-second order rate constant, and it was shown that H2PO4− had the greatest affinity for the adsorbent surface.
305 citations