Cunninghamella echinulata a new biosorbent of metal ions from polluted water in Egypt
Cunninghamella echinulata a new biosorbent of metal ions from polluted water in Egypt
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DOI：
10.2307/3762133
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发表时间：
2004-11-01
期刊：
影响因子：
2.8
通讯作者：
El-Morsy, ESM
中科院分区：
文献类型：
--
作者：
El-Morsy, ESM
从埃及曼苏拉省塔尔卡化肥厂附近的污染水道中分离出 32 种真菌。经常分离到黑曲霉、黄曲霉、Cunninghamella echinulata 和 Trichoderma koningii。根据其频率，选择 Cunninghamella echinulata 进行生物吸附研究。 C. echinulata 螯合离子的游离和固定生物量按递减顺序为：Pb > Cu > Zn。研究了生物质浓度、pH 值和接触时间的影响。离子吸收水平随着生物量的增加而上升。铅 (45 mg/g)、铜 (20 mg/g) 和锌 (18.8 mg/g) 的最大吸收发生在生物量为 200 mg/L 时。当 Pb 的 pH 值增加到 4 时，吸收量增加，而 Cu 和 Zn 的 pH 值增加到 5 时，吸收量增加。 15 分钟后所有金属的吸收达到最大。离子吸收遵循朗缪尔吸附模型，允许计算最大吸收和亲和系数。用 NaOH 处理 C. ecinulata 生物质可提高生物吸附能力，用藻酸盐固定也能提高生物吸附能力。固定化生物质可以通过稀盐酸处理轻松再生。生物质-海藻酸盐复合物可有效去除污染水样中的铅、锌和铜。因此，Cunninghamella echinulata 可以以游离或固定形式用作废水中金属离子的生物吸附剂。
Thirty-two fungal species were isolated from a polluted watercourse near the Talkha fertilizer plant, Mansoura Province, Egypt. Aspergillus niger, A. flavus, Cunninghamella echinulata and Trichoderma koningii were isolated frequently. On the basis of its frequency, Cunninghamella echinulata was chosen for biosorption studies. Free and immobilized biomass of C. echinulata sequestered ions in this decreasing sequence is: Pb > Cu > Zn. The effects of biomass concentration, pH and time of contact were investigated. The level of ion uptake rose with increasing biomass. The maximum uptake for lead (45 mg/g), copper (20 mg/g) and zinc (18.8 mg/g) occurred at 200 mg/L biomass. The uptake rose with increasing pH up to 4 in the case of Pb and 5 in the case of Cu and Zn. Maximum uptake for all metals was achieved after 15 min. Ion uptake followed the Langmuir adsorption model, permitting the calculation of maximum uptake and affinity coefficients. Treatment of C. echinulata biomass with NaOH improved biosorbent capacity, as did immobilization with alginate. Immobilized biomass could be regenerated readily by treatment with dilute HCl. The biomass-alginate complex efficiently removed Pb, Zn and Cu from polluted water samples. Therefore, Cunninghamella echinulata could be employed either in free or immobilized form as a biosorbent of metal ions in waste water.