Research Of Ag-carrying (Cu-carrying) Attapulgite Antibacterial Agent And Its Properties

Preparation technics and properties research of Ag-carrying antibacterial agents and Cu-carrying antibacterial agents by using attapulgite as carrier were done in this thesis. The results of technics research showed: 1. To be used as antibacterial carrier, crude attapulgite should be purified. An effective method was formed through the researches: First attapulgite and distilled water were mixed in the ratio of 7:93 for 48h, then separated for 3min. 0.4gNaOH/100gclay were used to reduce the viscosity. At last attapulgite were aparted by centrifugalation. The efficiency was enhanced by increase of the centrifugalation temperature. 30-40℃ were used better. And the reclaim-ratio of purification is 33%-45% in lab. 2. The carrying capacity of attapulgite could be enhanced from 017gAg/100gclay to 0.57gAg/100g clay afer attapulgite have been activited by HNO3 in waterish. And through the same process attapulgite could be bleached. The better technical conditions were showed by the testings: after have been treated with 0.8mol/l HNO3 in a 98癈 water bath for 80min, attapulgite could get the optimal activation effect. HNO3 was used to avoid creating precipitable Ag-salt. 3. Researchs showed that the primary factors for Ag-carrying process is concentration of AgNO3, reaction temperature, reaction time; and for Cu-carrying process is reaction temperature, reaction time, concentration of Cu(NO3)2. The better process conditions for Ag-carrying is treating the attapulgite with 0.03mol/l AgNO3 in a 60℃ water bath for 5h, and for Cu-carrying is treating attapulgite with 0.05mol/l Cu(NO3)2 in a 90℃ water bath for 6h.Rroperties research showed: 1. three kinds of antibacterial agents were all of excellent antibacterial actions. The colon bacillus and the golden staphylococcus could be 100% killed by Ag-carrying antibacterial agent and composite antibacterial agent. And the antibacterial-action-rates of Cu-carrying were 87.3% and 82.2%. 2. At the first 3h Ag-carrying and Cu-carrying antibacterial agents were released quickly in stati water. After 72h the releasing came into equilibrium and the percent of releasing were 8.55% and 7.67% respectively.3. The testings of lightfastness showed that Cu-carring antibactial agent have the best sunproof property. It hadn't any changs for 90 days in the atmosphere and ordinary sunshine. At the same condition, the color of Ag-carrying antimicrobial began to change from ivory white to light gray at the first 1 5days, then change from light black to black. The color of composite antibacterial agent was changed a little too. And the mechanism and corresponding countermeasures for color-change should be researched ulteriorly.XRD, infrared analysis showed that the crystallinity was reduced by activation, while the full crystalline structure of attapulgite wasn't changed by activation and adsorption. It's adsorbent property and collioidal property were still remained. DSC analysis showed that the crystal water were clearly increased after Cu-carrying. And the dehydrate temperatures of crystal water, zeolite water, frame water were all increased slightly.