The characteristics of polyvinyl alcohol (PVA) and calcium alginate as immobilization matrices were examined and compared for the uptake of gold by a fungal biomass. PVA-immobilized biomass showed superior mechanical strength and chemical stability. In addition, PVA beads were also stable under a wider range of pH (1-13). The lower mass transfer resistance in PVA beads was evident from kinetic studies which showed a significantly shorter period of time for the immobilized PVA beads to achieve 80% gold removal as compared with immobilized alginate beads. Calculated rate constants and maximum rates for the uptake of gold by both immobilized PVA and immobilized alginate biosorbent revealed a much more rapid uptake phenomenon by the former. BET analyses also indicated a larger surface area and larger pore size distribution in PVA beads, further indicating a lower resistance to mass transfer. Gold biosorption in the immobilized PVA bead could be modeled by both the Langmuir and Freundlich adsorption isotherms.

中文翻译：

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固定化真菌生物质对金的生物吸附

检查了聚乙烯醇 (PVA) 和海藻酸钙作为固定基质的特性，并比较了真菌生物质对金的吸收。PVA 固定的生物质显示出优异的机械强度和化学稳定性。此外，PVA 珠在更宽的 pH 值范围 (1-13) 下也很稳定。动力学研究表明 PVA 珠粒的传质阻力较低，动力学研究表明，与固定化海藻酸盐珠粒相比，固定化 PVA 珠粒实现 80% 金去除的时间显着缩短。计算出的固定化 PVA 和固定化海藻酸盐生物吸附剂吸收金的速率常数和最大速率表明前者的吸收速度要快得多。BET 分析还表明 PVA 珠粒具有更大的表面积和更大的孔径分布，进一步表明对传质的阻力较低。固定化 PVA 珠中的金生物吸附可以通过 Langmuir 和 Freundlich 吸附等温线建模。