One step bioconversion of waste precious metals into Serratia biofilm-immobilized catalyst for Cr(VI) reduction
One step bioconversion of waste precious metals into Serratia biofilm-immobilized catalyst for Cr(VI) reduction
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将废弃贵金属一步生物转化为沙雷氏菌生物膜固定催化剂，用于还原 Cr(VI)
DOI：
10.1007/s10529-015-1894-1
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发表时间：
2015
影响因子：
2.7
通讯作者：
L. Macaskie
中科院分区：
文献类型：
--
作者：
P. Yong;W. Liu;Zhibing Zhang;D. Beauregard;Michael L. Johns;L. Macaskie
pd -催化剂是还原Cr（VI）的优良催化剂，但价格昂贵。目的是证明沙雷氏菌生物膜作为生物源pd纳米颗粒载体的稳健性，并从贵金属废物中制备有效的催化剂。通过沙雷氏菌生物膜将钯纳米粒子固定在聚氨酯网状泡沫和聚丙烯载体上，生物膜的粘附和内聚强度不受钯化的影响，磁共振成像也显示了催化生物膜的完整性。当生物膜- pd和生物膜上的混合贵金属（生物膜- pm）分别以9和6 ml/h的流速固定在流动柱反应器中时，将5 mM Cr（VI）还原为Cr（III）。后者较低的活性归因于细菌上较少，较大的金属沉积物。在pH为7的情况下，活性都失去了，但通过用5毫米柠檬酸溶液洗涤或将柱暴露于pH为2的溶液中，活性恢复了，这表明在中性pH下，氢氧化铬（III）产物污染了贵金属废物。在连续流系统中，基于使用沙雷氏菌生物膜来制造和支持催化的pd纳米颗粒，贵金属废物“一锅”转化为废物净化的新催化剂。
For reduction of Cr(VI) the Pd-catalyst is excellent but costly. The objectives were to prove the robustness of a Serratia biofilm as a support for biogenic Pd-nanoparticles and to fabricate effective catalyst from precious metal waste. Nanoparticles (NPs) of palladium were immobilized on polyurethane reticulated foam and polypropylene supports via adhesive biofilm of a Serratia sp. The biofilm adhesion and cohesion strength were unaffected by palladization and catalytic biofilm integrity was also shown by magnetic resonance imaging. Biofilm-Pd and mixed precious metals on biofilm (biofilm-PM) reduced 5 mM Cr(VI) to Cr(III) when immobilized in a flow-through column reactor, at respective flow rates of 9 and 6 ml/h. The lower activity of the latter was attributed to fewer, larger, metal deposits on the bacteria. Activity was lost in each case at pH 7 but was restored by washing with 5 mM citrate solution or by exposure of columns to solution at pH 2, suggesting fouling by Cr(III) hydroxide product at neutral pH. A ‘one pot’ conversion of precious metal waste into new catalyst for waste decontamination was shown in a continuous flow system based on the use of Serratia biofilm to manufacture and support catalytic Pd-nanoparticles.
新型生物精炼厂：将废汽车催化剂浸出液中的贵金属生物回收成可有效金属还原和 2-戊炔氢化的新催化剂
影响因子：
4.8
作者：
Murray A
通讯作者：
Murray A
影响因子：
5.3
作者：
Creamer, N. J.;Mikheenko, I. P.;Macaskie, L. E.
通讯作者：
Macaskie, L. E.
影响因子：
2.8
作者：
Deplanche, Kevin;Caldelari, Isabelle;Macaskie, Lynne E.
通讯作者：
Macaskie, Lynne E.