...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Lead (Pb2+) sorptive removal using chitosan-modified biochar: batch and fixed-bed studies
【24h】

Lead (Pb2+) sorptive removal using chitosan-modified biochar: batch and fixed-bed studies

机译：脱乙酰壳多糖改性生物炭对铅（Pb2 +）的吸附去除：分批和固定床研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Chitosan-Modified fast pyrolysis BioChar (CMBC) was used to remove Pb ~(2+) from water. CMBC was made by mixing pine wood biochar with a 2% aqueous acetic acid chitosan (85% deacylated chitin) solution followed by treatment with NaOH. The characterizations of both CMBC and Non-Modified BioChar (NMBC) were done using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), scanning electron microscopy (SEM), surface area measurements ( S _(BET) ), elemental analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and ζ-potential measurements. Elemental analysis indicated that chitosan accounts for about 25% weight of the CMBC. The Langmuir maximum adsorption capacity of CMBC at pH 5 was 134 mg g ~(?1) versus 48.2 mg g ~(?1) for NMBC at 318 K. CMBC column adsorption studies resulted in a capacity of 5.8 mg g ~(?1) (Pb ~(2+) conc. 150 mg L ~(?1) ; pH 5; column dia 1.0 cm; column length 20 cm; bed height 5.0 cm; flow rate 2.5 mL min ~(?1) ). CMBC removed more Pb ~(2+) than NMBC suggesting that modification with chitosan generates amine groups on the biochar surface which enhance Pb ~(2+) adsorption. The modes of Pb ~(2+) adsorption on CMBC were studied by comparing DRIFTS and X-ray photoelectron spectroscopy spectra before and after Pb ~(2+) adsorption.
机译：壳聚糖修饰的快速热解BioChar（CMBC）用于从水中去除Pb〜（2+）。通过将松木生物炭与2％的乙酸壳聚糖水溶液（85％的脱酰甲壳素）溶液混合，然后用NaOH处理，制成CMBC。使用漫反射红外傅里叶变换光谱（DRIFTS），扫描电子显微镜（SEM），表面积测量（S _（BET）），元素分析，热重分析（CMBC）和非改性生物炭（NMBC）进行表征TGA），差示扫描量热法（DSC）和ζ电位测量。元素分析表明，壳聚糖约占CMBC重量的25％。 pH值为5时CMBC的Langmuir最大吸附容量为134 mg g〜（？1），而NMBC在318 K时为48.2 mg g〜（？1）.CMBC柱吸附研究得出的容量为5.8 mg g〜（？1） ）（Pb〜（2+）浓度150 mg L〜（？1）; pH 5;柱直径1.0 cm;柱长20 cm;床高5.0 cm;流速2.5 mL min〜（？1））。 CMBC比NMBC去除更多的Pb〜（2+），这表明壳聚糖修饰会在生物炭表面产生胺基，从而增强Pb〜（2+）的吸附。通过比较Pb〜（2+）吸附前后的DRIFTS和X射线光电子能谱，研究了CMBC上Pb〜（2+）的吸附方式。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号