Papers by Keyword: Inorganic Ions

Abstract: The adsorption behavior of Pb²⁺, Cu²⁺, and Cr³⁺ from aqueous solutions onto bacterial cellulose/magnetite (BC/Fe₃O₄) composite in multiple systems was systematically investigated, with particular focus on competitive adsorption and inorganic ion effects. The BC/Fe₃O₄ composite demonstrated significant adsorption capacity for the three heavy metals through mechanisms involving surface complexation and electrostatic interactions. Binary and ternary competitive adsorption studies revealed that the adsorption capacity followed the sequence of Pb²⁺ (0.847 mmol/g) > Cu²⁺ (0.673 mmol/g) > Cr³⁺ (0.556 mmol/g), correlating inversely with their hydration energies. The presence of inorganic ions (Na⁺, K⁺, Mg²⁺, Ca²⁺) showed inhibitory effects on heavy metal adsorption, primarily due to competition for adsorption sites. Conversely, Al³⁺ and Fe³⁺ enhanced adsorption performance through synergistic effects. Notably, Pb²⁺ adsorption remained relatively unaffected by competing ions due to its strong affinity for BC/Fe₃O₄, while Cr³⁺ showed unique behavior in competitive systems. EDTA demonstrated superior desorption efficiency compared to HNO₃, with efficiencies ranging from 61.2% to 68.4%. This study highlights the potential of BC/Fe₃O₄ composite as an effective adsorbent for heavy metal removal from complex water matrices.

Abstract: Perfluorooctanoic acid (PFOA), one of persistent organic pollutants (POPs), has prompted much concern in the last fifty years. Its accumulation in the natural environment is increased, and its threats to ecosystems have been discovered. Because of the highly stable, PFOA was hardly decomposed and defluorination. In previous study, a photo-reduction method is developed for the decomposition of PFOA in Milli-Q water with potassium iodide (KI) as a mediator. But this system wasn’t discussed in natural environment. In this study, several common inorganic ions in the surface water were been choice as the object. By analyzing the matrix effects of different kinds of anions and cations to the photo-reductive defluorination of PFOA, it shows that the presence of anions in the system will heavily inhibit the degradation process, while the impact of cations to the degradation is related to the concentration. And, both anions and cations can inhibit the defluorination process, but anions have much greater impact than the cations to the defluorination rate.

Abstract: A heterogeneous catalytic system, which was based on sulfate radicals activated by supported cobalt oxide (Co3O4), was employed to degrade Orange II. Four kinds of inorganic ions including H2PO4-、HCO3-、NO3-、Cl- were introduced into the reaction. The effect of inorganic ions on the degradation rate of Orange II was systematically studied and assessed.

Abstract: Six strains named SY1 to SY6 were isolated from oil-polluted soil. The degradation tests of oil by our isolates were carried out under still-reaction-bottle-aeration and shaking-aeration conditions. The co-metabolic characteristics of two co-substrates (ethanol and glucose) and inorganic ions on the biodegradation of oil by our isolates were also studied. The results show that oil can be degraded by the six isolates effectively. The degradation ability of strains is enhanced due to co-substrates added. The enhanced roles of glucose are stronger than ethanol to SY1 and SY5; while the enhanced roles of ethanol are stronger than glucose to SY3.And the enhanced roles of glucose and ethanol are similar to SY2, SY4 and SY6. Inorganic ions, such as Ca2 + Fe2 +, Mg2+, etc, could promote the degradation ability of strains and improve the growth of strains. The degradation effects of mixed strains were inferior to that of single strain. After five days, the degradation rate of SY3 was worst, which was 65.7%. In the mixed strains, there were only 11 groups’ degradation rates greater than that of SY3, and other 46 groups’ degradation rates were less than that of SY3.

Abstract: As a natural biomaterial, collagen especially pepsin-solubilized collagen (type I) has been used widely in biomedical fields due to its excellent biocompatibility. In this preliminary study, we investigate the effect of some inorganic ions which are frequently utilized in the preparation of collagen on the morphology and crystallinity of fibrils. The scanning electron microscope and x-ray diffraction were applied to analyze the morphology and the crystallization of the reconstituted collagen fibrils, respectively. Although further studies are needed, these initial results indicate that by controlling the self-assembly conditions of collagen molecules, we may achieve the desired properties of fibrillar collagen products.

Abstract: The gelation process is of importance for the structure and texture of the silica particle and further functionalization in the area of biomedical application. In a base-catalysis process the sodium phosphate or plus calcium nitrate salts could be added to induce the gelling velocity and particle size distribution. Multivalent anions (phosphate ions) or dication (calcium ions) induce the microscopic phase separation and accelerate gelation of silica sol. Furthermore, the composite silica nanospheres show excellent monodispersibility as well as pH-stability in the simulated body fluids or Tris-HCl buffer solution, which will help to surface modification and functionalization in the biomolecule-existing environments.