超声波辅助改性竹粉吸附剂的制备及对铅离子的吸附研究  

Ultrasonic Wave-assisted Preparation of Bamboo Powder-based Adsorbents for Pb^(2+) Removal

作　　者：郭逗逗[1,2,3] 庞浩[1,2] 刘海露[1,2] 徐莉莉[1,2] 郑景新[1,2] 廖兵[1,2] 

机构地区：[1]中国科学院广州化学研究所 [2]中国科学院纤维素化学重点实验室,广东广州510650 [3]中国科学院大学,北京100049

出　　处：《林产化学与工业》2013年第6期1-6,共6页Chemistry and Industry of Forest Products

摘　　要：利用超声波辅助预处理竹粉,之后用丙烯腈和盐酸羟胺对其进行改性,并用X射线衍射(XRD)和红外光谱(FT-IR)对竹粉预处理和化学改性前后的结构变化进行表征。XRD数据显示竹粉结晶度从超声波处理前的64%下降到42%,说明超声波预处理提高了竹粉纤维素的可及度和化学反应活性。在红外光谱中观察到了—C≡N、—CN、N—OH的特征吸收峰,元素分析测得改性竹粉吸附剂含氮量为9.8%,说明通过化学改性成功的在竹粉结构中引入了偕胺肟基团。讨论了吸附条件的影响,以及竹粉吸附剂的Langmuir和Freundlich吸附模型。结果表明:在pH值为6,投料量为2.5 g/L的条件下,初始金属离子质量浓度为1 300 mg/L时改性竹粉达到最大吸附值243.09 mg/g,改性竹粉吸附铅离子的吸附符合Langmuir和Freundlich吸附模型。In this study a ultrasonic wave-assisted chemical modification of bamboo powder was carried out to prepare an effective amidoximated bamboo powder-based absorbents for Pb2＋ removal from water.The bamboo powders were first pretreated by ultrasonic wave,then subsequently modified by acrylonitrile in alkaline medium and aqueous hydroxylamine.The resulting absorbents were characterized using Fourier transform infrared （FT-IR） and the characteristic absorption peaks corresponding to -C≡N,-C=N and N-OH groups were observed.XRD showed that the degree of crystalline of resulting product decreased from 64 ％ to 42％.The nitrogen content determined by elemental analysis is 9.8 ％.This indicated that the amidoxime group was successfully attached onto the bamboo powders.Adsorption of Pb （Ⅱ） ions by the modified bamboo powder adsorbents were also performed by batch experiments in order to investigate the effects of the adsorbent dosage,initial pH of the solution,and initial Pb2＋ concentration on the adsorption of Pb2＋,respectively.Langmuir-Freundlich plots and their isotherm coefficients for the adsorption of Pb（Ⅱ） using the adsorbent were probed.It was found that modified bamboo powders with the aid of ultrasound have a maximum absorption of Pb2＋ 243.09 mg/g under the condition of pH at 6.0,amount of 2.5g/L for absorption and initial ionic concentration of 1 300 mg/L.It agreed with Langmuir-Freundlich isotherm model.

关 键 词：超声波 竹粉 吸附 改性 重金属离子 

分 类 号：TQ35[化学工程]