对固定化亚心形扁藻(Platymonas subcordiformis)在CCCP(羰基氰化物间氯苯腙)胁迫条件下两段法光解水产氢进行了研究,比较5种不同金属离子海藻酸盐固定化扁藻产氢,其中海藻酸钙固定化能够很好地的保持扁藻产氢活性。海藻酸钙固定化扁藻产氢条件优化表明:固定化细胞适宜暗诱导时间为24 h;产氢适宜粒径为1mm;细胞密度在很宽负载量范围内表现为很好的产氢活性。固定化细胞产氢最佳pH值向酸性方向移动0.5~1个单位,适宜pH值范围变宽;最佳产氢光强为4000 lx,最佳温度为25℃。优化条件下固定化细胞能够更高效稳定产氢。产氢后固定化细胞重培养产氢实验表明:产氢后重培养的细胞可恢复生长并有相近的产氢活性,实现了产氢扁藻的再利用。
Platymonas subcordiformis was immobilized in the alginate-gel beads under the addition of 15 μmol·L~(-1)proton gradient uncoupler CCCP for H_2 evolution. Among 5 different metal cations acted as gel bead stabilizing agents, calcium alginate beads increased H_2 evolution activity by 20% compared with the control. The optimum bead diameter for photo-hydrogen evolution is lmm. At a wide range of cell loading the hydrogen yield is stable. The optimum pH range is enlarged with a shift of 0. 5—1 pH to the acidic ...