A low-cost adsorbent was prepared from sludge and straw by pyrolysis in a dried state with the surface area of the adsorbent of 829.49 ma. g-l, micropore volume of 0.176 cm2·g-1 and average pore radius of 5.0 nm....A low-cost adsorbent was prepared from sludge and straw by pyrolysis in a dried state with the surface area of the adsorbent of 829.49 ma. g-l, micropore volume of 0.176 cm2·g-1 and average pore radius of 5.0 nm. The kinetic, equilibrium isotherm and thermodynamic characteristics of trisodium 1-（1-naphthylazo）-2-hydroxynaphthalene- 4＇,6,8-trisulphonate （acid scarlet 3R） onto the adsorbent from sludge and straw were investigated. The results indicated that the pseudo second order adsorption was the predominant adsorption mechanism of acid scarlet 3R. Thus, the adsorption phenomenon was suggested as a chemical process. The adsorption data were fitted better with Langmuir model than Freundlich model, indicating that the adsorption of acid scarlet 3R belonged to the monolayer adsorption and mainly occurred in micropores.展开更多
A new type of photo-electro-chemical catalytic reactor was designed.Cathode and anode of the new reactor were made of high-purity graphite and titanium dioxide electrode re-spectively.A saturated calomel electrode (SC...A new type of photo-electro-chemical catalytic reactor was designed.Cathode and anode of the new reactor were made of high-purity graphite and titanium dioxide electrode re-spectively.A saturated calomel electrode (SCE) was used as the reference electrode.Under the condition of ultraviolet radiation and anodic bias-voltage,acid scarlet 3R was degraded by the process of photoelectrocatalysis with titanium dioxide electrode in anodic compartment,while it was degraded by electrogenerated Fenton’s reagent and hydrogen peroxide through reducing dissolved oxygen with graphite electrode in catholyte.The new reactor made the best use of photogenerated holes and photogenerated charge on the anode of the new reactor,which achieved the purpose of degrading acid scarlet 3R in the cathodic and anodic compartments simultaneously,i.e.“two electrodes and double effect”.The experimental results showed that,compared with other photoelectrocatalysis reactors (“two electrodes and single effect” reactor),the new reactor has obviously enhanced the degradation of acid scarlet 3R dye.With the con-centration of the dye being 30 mg·L?1 in water,under the operating conditions that when the inert supporting electrolyte concentration was 0.02 mol·L?1 sodium sulfate,initial solution pH = 3,and cathodic potential ?Ec = 0.66 V,the highest decolorizing efficiency of 92% was accomplished in cathodic compartment,and that of 60% in anodic compartment.展开更多
基金Supported by the Shanxi Science and Technology Agency Research Project(20100321085)the Scientific Research Foun-dation of the Shanxi Education Department(20111029)
文摘A low-cost adsorbent was prepared from sludge and straw by pyrolysis in a dried state with the surface area of the adsorbent of 829.49 ma. g-l, micropore volume of 0.176 cm2·g-1 and average pore radius of 5.0 nm. The kinetic, equilibrium isotherm and thermodynamic characteristics of trisodium 1-（1-naphthylazo）-2-hydroxynaphthalene- 4＇,6,8-trisulphonate （acid scarlet 3R） onto the adsorbent from sludge and straw were investigated. The results indicated that the pseudo second order adsorption was the predominant adsorption mechanism of acid scarlet 3R. Thus, the adsorption phenomenon was suggested as a chemical process. The adsorption data were fitted better with Langmuir model than Freundlich model, indicating that the adsorption of acid scarlet 3R belonged to the monolayer adsorption and mainly occurred in micropores.
基金the Scientific and Technical Planned Project of Guangdong Province(Grant No.2002C31622) the Natural Science Foundation of Guangdong Province(Grant No.31921).
文摘A new type of photo-electro-chemical catalytic reactor was designed.Cathode and anode of the new reactor were made of high-purity graphite and titanium dioxide electrode re-spectively.A saturated calomel electrode (SCE) was used as the reference electrode.Under the condition of ultraviolet radiation and anodic bias-voltage,acid scarlet 3R was degraded by the process of photoelectrocatalysis with titanium dioxide electrode in anodic compartment,while it was degraded by electrogenerated Fenton’s reagent and hydrogen peroxide through reducing dissolved oxygen with graphite electrode in catholyte.The new reactor made the best use of photogenerated holes and photogenerated charge on the anode of the new reactor,which achieved the purpose of degrading acid scarlet 3R in the cathodic and anodic compartments simultaneously,i.e.“two electrodes and double effect”.The experimental results showed that,compared with other photoelectrocatalysis reactors (“two electrodes and single effect” reactor),the new reactor has obviously enhanced the degradation of acid scarlet 3R dye.With the con-centration of the dye being 30 mg·L?1 in water,under the operating conditions that when the inert supporting electrolyte concentration was 0.02 mol·L?1 sodium sulfate,initial solution pH = 3,and cathodic potential ?Ec = 0.66 V,the highest decolorizing efficiency of 92% was accomplished in cathodic compartment,and that of 60% in anodic compartment.
