Studies of Properties on the Immobilized Saccharomyces cerevisiae Waste Biomass Adsorbing Pt~(4+)
- 化学化工－已发表论文 
用2%海藻酸钠与1%明胶混合为包埋剂固定啤酒酵母废菌体.固定化啤酒酵母废菌体(ISCWB)呈球形,粒径2～3mm.ISCWB吸附作用受吸附时间、溶液pH值、ISCWB浓度和Pt4+起始浓度等的影响,但不受温度的影响;吸附作用是一个快速的过程,吸附60min达到平衡,但在最初的5min内吸附量可达最大吸附量的88.4%.吸附Pt4+的最适pH为2.0.在Pt4+起始浓度200mg/L、固定化菌体浓度1.6g/L、pH2.0和30℃条件下振荡吸附60min,吸附量为44.0mg/g.TEM观察显示,固定化菌体不仅能吸附Pt4+而且能将Pt4+还原成Pt0.从含Pt4+95.22mg/L和47.61mg/L的废铂催化剂处理液中回收铂,其吸附率分别为48.44%和60.72%,吸附量为26.97mg/g和17.21mg/g.以1.0mol/L盐酸作为解吸剂,解吸率达80.2%.在填充床反应器中,固定化菌体的最大饱和吸附量为21.0mg/g,解吸率为80%.该固定化菌体有较好的应用前景.Saccharomyces cerevisiae waste biomass(SCWB) was entrapped in a mixture of 2% alginate sodium and 1% gelatin. The immobilized SCWB (ISCWB) appeared spherical in shape with an average diameter of 2～3mm. The adsorption time, pH value, adsorbent concentration and Pt4+ initial concentration of the solution affected the ISCWB adsorbing Pt4+. The optimum pH value of Pt4+ adsorption by ISCWB was 2.0. The temperature did not have significant affect for the adsorption. The adsorption was a rapid process, reaching 88.4% of the maximum capacity within the first 5 min. The adsorptive capacity reached 44.0 mg/g under the conditions of 200 mg Pt4+/L, 1.6g adsorbent/L, pH2.0 and 30℃ for 60 min. TEM analysis confirmed that Pt4+in the solution could be adsorbed and reduced to Pt0 particles by ISCWB. The adsorptive efficiency of Pt4+ by ISCWB from the treatment solution containing 95.22 mg Pt4+/L and 47.61 mgPt4+/L of waste platinum catalyst were 48.44% and 60.72%, and the capacity were 26.97 mg/g and 17.21 mg/g, respectively. 80.2% of Pt4+ adsorbed on ISCWB could be desorbed with 1.0 mol/L HCl. In packedbed reactor, the saturation uptake and desorbed efficient were 21.0 mg/g and 80%, respectively.