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| 生物改性玉米秸秆处理含铜废水的研究 |
| Study on copper-containing wastewater treated by bio-modification of corn stalks |
| 投稿时间：2018-06-13 |
| DOI：10.13254/j.jare.2018.0155 |
| 中文关键词: 玉米秸秆，黑曲霉，生物改性，铜离子 |
| 英文关键词: corn stalk, Aspergillus niger, biological modification, copper ion |
| 基金项目:黑龙江省省院科技合作项目（YS17A06）；黑龙江省科学院青年创新基金项目（CX16H02）；黑龙江省科学院院所应用技术研究专项（ZNGY1603） |
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| 中文摘要: |
| 为解决水体中铜离子污染治理及玉米秸秆资源化利用等问题，以黑曲霉为改性菌剂，采用固态发酵法改性玉米秸秆，制备出复合生物吸附剂。采用傅里叶红外光谱仪（FT-IR）和扫描电子显微镜（SEM）表征改性玉米秸秆，同时对吸附剂的投加量（0.05~0.30 g）、溶液初始浓度（10~200 mg·L-1）、溶液初始pH（1.0~6.0）以及动力学和等温吸附线进行了研究。结果表明，通过黑曲霉固态发酵法改性后的玉米秸秆对Cu（Ⅱ）的饱和吸附量为33.6 mg·g-1，是天然玉米秸秆的2.65倍。FT-IR和SEM表征结果显示，改性材料表面空隙增多，更为粗糙，更多的活性基团得以暴露，这为吸附性能的提高提供了依据。改性玉米秸秆对Cu（Ⅱ）吸附30 min后达平衡，可用准二级动力学模型较好地拟合，吸附等温线符合Langmuir方程，该吸附过程以单分子层吸附为主。利用黑曲霉固态发酵技术改性玉米秸秆，是一种快速资源化处理玉米秸秆的方法。 |
| 英文摘要: |
| In order to solve the copper ion pollution in water and the utilization of corn stalk, the Aspergillus niger was used as a modified microbial inoculum to produce bio-adsorbent by means of solid-state fermentation of corn stalk. The effect of adsorbent addition (0.05~0.30 g), initial solution pH (1.0~6.0)and initial concentration of Cu (Ⅱ)ions (10~200 mg·L-1)on the biosorption capacity of the Aspergillus niger-modified corn stalk (ACS)were investigated. The results indicated that the maximum biosorption capacity of ACS to the Cu (Ⅱ) ions was 33.6 mg·g-1, which was 2.65 times as many as the maximum biosorption capacity of the raw corn stalk (RCS). Comparing RCS and ACS by means of scanning electron microscopy (SEM)and fourier transform infrared spectroscopy (FT-IR),the results separately showed that ACS had rougher surface,and had more free hydroxyl and carboxyl groups, which explained the increase of Cu (Ⅱ)ions absorption. Biosorption kinetics and biosorption isotherm of ACS on Cu (Ⅱ)ions were investigated. The results indicated that biosorption process of Cu (Ⅱ)ions on ACS could reach biosorption equilibrium after 30 min, and the quasi-second-order kinetic biosorption model could describe the biosorption process effectively. The biosorption process was dominated by monolayer biosorption and was well fitted to the Langmuir equation. The results also showed that the modification of corn stalk using Aspergillus niger solid-state fermentation was a rapid resource treatment method for corn stalk. |
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