Effect of Chemical Modification of Hydroxyapatite/Zeolite Composite on Malodors Adsorption Behavior

Abstract

Hydroxyapatite (HAp)/zeolite composite (HZc) was prepared by a simple immersion method, and it was then modified with Cu 2+ and 3-aminoplopyltriethoxysilane (APES) to produce a novel adsorbent for unpleasant odors such as NH 3 , H 2 S and CH 3 CHO gases. The obtained materials were characterized by SEM-EDS, XRD, FT-IR, TG-DTA and ninhydrin reaction test. Nano-sized order HAp was observed distributed on zeolite for HZc, and modification of HZc with Cu 2+ and APES maintained the original framework structure of HZc. Introduced amount of Cu 2+ and APES after the modification was 3.6 mol% and 12.6 mg·g -1 , respectively. The adsorption ability evaluated via a gas bag-detection tube method showed that Cu 2+ -modified HZc increased NH 3 and H 2 S adsorption ability, and APES-modified HZc enhanced CH 3 CHO adsorption ability in comparison to unmodified one, respectively. Sequential modification of HZc with Cu 2+ and APES also maintained H 2 S and NH 3 adsorption ability, but decreased CH 3 CHO adsorption ability. This suggests that adsorption sites for CH 3 CHO were impeded in case of formation of Cu-N coordinate bond derived from direct interaction between Cu 2+ and amino groups of APES. Therefore, use of HZc individually modified with Cu 2+ and APES is recommended to capture multiple unpleasant odors.

An overview of synthesis and characterization of hydroxyapatite-zeolite composites for bone implant application

“…The HA-zeolite composite is used as an adsorbent composite to remove cobalt ions from aqueous solutions. They report that HA-zeolite composites have better surface adsorption compared to pure HA which is around 65% of cobalt (II) in pH close to 6 and temperatures around 30 o C. The level of surficial adsorption lower by metal ion content [53,54]. It has been earlier reported that the porous apatite layer can strengthen the application of bone tissue engineering [55].…”

“…Biocompatibility is evaluated and shows the presence of silica biocompatible behavior which is increased by the presence of HA in nanocomposites. The adsorption ability of HA-zeolite composites produced by the precipitation method has been evaluated by Nishida et al [53]. The HA-zeolite composite is used as an adsorbent composite to remove cobalt ions from aqueous solutions.…”

The Use of Calcium Phosphates in Cosmetics, State of the Art and Future Perspectives

“…It was hypothesized that the adsorption capaci of Cu-HA was related to the electronic structure of copper in the crystal lattice. In a follow up work authored by Nishida et al [333], a composite material of HA and zeolite w prepared and subsequently functionalized with Cu 2+ and amino groups. It was found th the copper-doped composites have an excellent adsorption capacity for H2S and NH gases, and the amino functionalization also imparted a good adsorption capacity f Reprinted with permission from [332]).…”

Highly esthetic, deodorant, and antibacterial tile with natural zeolite set via a blast furnace slag-based geopolymer

“…In our previous study, the natural Itaya zeolite-related material in which divalent copper ion was supported showed drastic and decent enhancement of ability to adsorb NH 3 and H 2 S gases, respectively. 1) These findings have motivated us to fabricate a practical deodorant product containing natural zeolite, which can be mainly applied to a part of interior building materials such as tiles. To solidify the zeolite powder into a three-dimensional continuum with a certain size and strength, it must be encased with the aid of inorganic cementitious binders.…”