Alginate Production from Alternative Carbon Sources and Use of Polymer Based Adsorbent in Heavy Metal Removal
Alginate Production from Alternative Carbon Sources and Use of Polymer Based Adsorbent in Heavy Metal Removal
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DOI：
10.1155/2016/7109825
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发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Yildiz, Merve
中科院分区：
文献类型：
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作者：
Moral, Cigdem Kivilcimdan;Yildiz, Merve
藻酸盐是由甘露糖醛酸和古罗糖醛酸组成的生物聚合物。它是从海洋褐藻收获;然而，藻酸盐也可以由一些细菌物种，即固氮菌和假单胞菌合成。使用纯碳水化合物来源用于细菌藻酸盐生产增加了其成本并限制了聚合物在工业市场上的机会。为了降低藻酸盐生产的成本，本研究利用糖蜜、麦芽糖和淀粉作为替代的低成本碳源。结果是有前途的情况下，糖蜜与最大4.67 g/L的海藻酸盐生产。藻酸盐在早期发酵过程中富含甘露糖醛酸，与碳源无关，而在麦芽糖的情况下获得最高的古洛糖醛酸含量为68%。然后将聚合物与斜发沸石（一种天然沸石）结合，以从合成废水中去除铜。根据Langmuir吸附等温线模型，在pH 4.5时，海藻酸钠-斜发沸石珠对铜的吸附量可达131.6 mg Cu 2 +/g吸附剂。
Alginate is a biopolymer composed of mannuronic and guluronic acids. It is harvested from marine brown algae; however, alginate can also be synthesized by some bacterial species, namely, Azotobacter and Pseudomonas. Use of pure carbohydrate sources for bacterial alginate production increases its cost and limits the chance of the polymer in the industrial market. In order to reduce the cost of bacterial alginate production, molasses, maltose, and starch were utilized as alternative low cost carbon sources in this study. Results were promising in the case of molasses with the maximum 4.67 g/L of alginate production. Alginates were rich in mannuronic acid during early fermentation independent of the carbon sources while the highest guluronic acid content was obtained as 68% in the case of maltose. The polymer was then combined with clinoptilolite, which is a natural zeolite, to remove copper from a synthetic wastewater. Alginate-clinoptilolite beads were efficiently adsorbed copper up to 131.6 mg Cu2+/g adsorbent at pH 4.5 according to the Langmuir isotherm model.