Study Of Ag/AgCl Visible-Light Photocatalyst And Preparation Of Carbon Black Paste With High Dispersion Stability

As the industrialization and globalization proceed,environmental problems caused by organic pollutants are getting more and more serious.Semiconductor photocatalysis,especially Ag/AgCl based photocatalysis,has attracted much attention as a cost-effective way for the elimination of environmental pollutants.Recently,plasmonic photocatalysts,especially Ag/AgCl based photocatalysis have received much attention because of their superior photocatalytic activity and high photostability.It is well known that the size and morphology of Ag/AgCl plasmonic photocatalysts have a significant influence on their photocatalytic activity.Up to now,to manufacture Ag/AgCl plasmonic photocatalysts with controllable size and morphology,many methods such as ion-exchanging method,solvothermal method,ionic liquid assisted hydrothermal,direct-precipitation route,sacrificial salt-crystal-template(SCT)and in situ oxidation method are employed.However,these approaches usually needed high temperature and the size of most Ag/AgCl plasmonic photocatalysts reported was very large,leading the decrease of photocatalytic activity.Assembly is a “bottom-up” way,which has been widely used to fabricate various functional architectures.In this paper,we report a self-assembly assisted by in situ oxidation method to prepare Ag/AgCl nanomaterials directly from Ag nanoparticles.Ag/AgCl nanospheres with a mean diameter of 80 nm and nanocubes with a mean edge length of 150 nm were obtained and exhibited excellent visible-light photocatalytic performance.About 95% of the MO could be photodegradated in 30 min by using Ag/AgCl nanospheres photocatalysts.About 95% of the MO could be photodegradated in 20 min by using Ag/AgCl nanocubes photocatalysts.Ag/AgCl nanocubes shows superior photocatalytic performance,compared with Ag/AgCl nanospheres,which may be due to more efficient charge transfer on the surface of nanocubes.Based on the experimental results,the plausible formation mechanism of Ag/AgCl involves in the in-situ oxidation of Ag nanoparticles process,the assembly of AgCl nanoparticles,the Ostwald ripening process and photodecomposition of surficial AgCl into Ag atoms under the illumination of room light.Gel ink is one kind of ink that the viscosity is between oil ink and aqueous ink.Because of excellent lubrication as oil ink and flueny as aqueous ink,gel ink have received much favor at the beginning.The stability of the paste is very important to gel ink.Carbon black is one kind of widely used colorant.Up to now,carbon black paste made in china has poor stability due to the strong force between carbon black particles.In this paper,surfactants and polymer disperants were used separately to prepare carbon black paste.Carbon black paste prepared by using polymer disperants exhibit more excellent stability compared with paste prepared by using surfactants.In addition,we used diazonium salt to modify carbon black and the process conditions were studied.Carbon black paste with average diameter of 104.6 nm,Zeta potential of-70.4 mV and high dispersion property was prepared.After microencapsulation of carbon black,carbon black microcapsule paste with concentration of 26%,D90 of 117 nm,surface tension of 60 mN/m,viscosity of 2.3 mpa·s and high dispersion stability was prepared.