Feng Huixia

Preparation and Characterization of a Carbon/Fly Ash Composite Adsorbent

Fly ash,a kind of industrial solid waste material produced during the combustion of coal in the electricity generation,was utilized to prepare a novel carbon/fly ash composite adsorbent with core-shell structures by a partial carbonization and sulfonation process.The prepared composite adsorbent was characterized with XPS,FT-IR,SEM,XRD and gas adsorption experiments.The results showed that fly ash was coated by graphite-like carbon nanoparticles.The carbon,oxygen,silica and sulfur are the main elements on the surface of the prepared composite adsorbent.Among them,the carbon and oxygen elements are the dominant superficial elements.An abundant of mesopores existed on the surface of the composite adsorbent.The Brunauer Emmett Teller(BET) surface area SBET is 5.4 m2/g.Meanwhile,an abundant of oxygen functional groups,such as carboxyl,hydroxyl and sulfonic groups,which were very effective in capturing cationic organic dyes and heavy metal ions and acted as the main adsorption sites of the composite adsorbent,were successfully introduced on the composite adsorbent surface.The adsorption capacity of the prepared composite for typical cationic dye methylene blue and heavy metal ions was also investigated and compared with activated carbon and fly ash under the same experimental condition.The results show that the composite adsorbent exhibits excellent adsorption performance.The adsorption capacity for methylene blue can reach about 83.7% of activated carbon adsorption capacity,and the adsorption capacity for heavy metal ions Cd2+,Ni2+,Pb2+ and Cu2+ can reach about 104.3%,131.1%,170.5% and 127.3% of the capacity of activated carbon,respectively.The adsorption capacity for methylene blue and heavy metal ions is far more than that of fly ash.The prepared carbon/fly ash composite adsorbent can be used as a potential substitute of activated carbon for heavy metal ions or organic dyes adsorption in waste water.

The Feasibility Research with Potassium Permanganate to Preoxidize in Light Polluted Yellow River Water

The effect of preoxidation Yellow River with light polluted water by composite potassium permanganate process are studied in the text. The best adding quantity of composite potassium permanganate is 1.5-3.0mg/l, PAC as the flocculant, the best adding quantity is 60mg/l. Under these conditions, pretreat Yellow River with mic-polluted water which the results show that permanganate preoxidation obviously reduced to each index. The chemical oxygen demand ratio of the phenol is 64.6%, the color removing rate amounted to 80.4%, the turbidity removing rate amounted to 90.1%, greatly improving the water quality of purification.

Study on Desulfurization of SO 2 by Co 3 O 4 -γ-Al 2 O 3 /ATP Desulphurizer

A kind of new desulphurization agent Co₃O₄-γ-Al₂O₃/ATP, which was an composite desulphurization adsorbent that made of the mixture of γ-Al₂O₃(34%wt) and attapulgite(65%wt ,ATP, produced in Gansu Linze) and some additives(1%wt), and coated with the metal oxide(Co₃O₄), was studied. The influences of containing water rate and Co₃O₄ content of the Co₃O₄-γ-Al₂O₃ /ATP desulphurizer on SO₂ desulphurization capability were also studied. According to the experiments, when Co₃O₄ content is about 3%~5%, and containing water rate of the desulphurizer is 15wt%˜30wt%, the desulphurization adsorbent has good adsorptivity and good desulphurization ability as a catalysis agent. Its sulfur tolerance is 19.74%, which is superior than that of CuO-γ-Al₂O₃/ATP and CuO/γ-Al₂O₃ desulphurizers.