五种改性纳米纤维素吸附剂的制备及除磷性能比较

doi:10.16085/j.issn.1000-6613.2017-0376

摘要/Abstract

摘要： 含磷废水的排放是造成水体富营养化的重要原因，吸附法可以有效去除废水中的磷。开发环境友好的高效吸附剂是该法进一步推广的关键因素之一。采用TEMPO氧化+机械剪切结合的方法制备纳米纤维素（CNFs），分别用Fe（OH）₃、Al（OH）₃、Mg（OH）₂、La₂O₃和MnO₂对CNFs进行改性。将改性前后的CNFs用于吸附去除废水中磷，并比较了不同pH条件下的除磷效果。结果表明，Fe（OH）₃、Al（OH）₃、Mg（OH）₂、La₂O₃和MnO₂均能成功负载于CNFs上。经改性后的CNFs对磷的吸附去除效果有明显提高，pH越低吸附容量越高。同一pH条件下，吸附容量依次为Fe（OH）₃@CNFs > Al（OH）₃@CNFs > Mg（OH）₂@CNFs > La₂O₃@CNFs > MnO₂@CNFs。Fe（OH）₃@CNFs对磷的吸附效果最好，且受pH变化的影响不大。在磷初始浓度为10mg/L、pH为4时，Fe（OH）₃@CNFs对磷的吸附容量为7.58mg/g，为未负载CNFs的94.75倍；当pH升高至7时，其吸附容量仍可达到7.09mg/g。将其用于实际废水除磷时无需调节pH，可节约药剂，降低处理成本。

关键词: 纳米纤维素, TEMPO氧化, 改性, 吸附, 除磷

Abstract: The discharge of phosphorus wastewater is considered as a dominant factor for water eutrophication. Adsorption is an effective method for phosphorus removal in the wastewater treatment. The development of environment friendly adsorbents with good adsorption capacity is one of the key factors for the further a adsorption application. The TEMPO oxidation combined physical treatments was used to prepare the cellulose nanofiber hybrid(CNFs). Then, Fe(OH)₃, Al(OH)₃,Mg(OH)₂,La₂O₃ and MnO₂ were used to modify CNFs. CNFs and modified CNFs were applied in the phosphate removal from wastewater. The performance of phosphate removal at different pH was investigated. Fe(OH)₃,Al(OH)₃,Mg(OH)₂,La₂O₃ and MnO₂ could be successfully loaded onto CNFs. While modified CNFs showed higher adsorption capacity than CNFs. The phosphate adsorption capacities of modified CNFs were as follows:Fe(OH)₃@CNFs > Al(OH)₃@CNFs > Mg(OH)₂@CNFs > La₂O₃@CNFs > MnO₂@CNFs,and they all had better phosphate adsorption performance in lower pH. It could be concluded that Fe(OH)₃@CNFs had a superior adsorption performance. When the initial concentration of phosphate is 10mg/L,the adsorption capacity of Fe(OH)₃@CNFs was 7.58mg/g at pH 4,which is 95.75 times that of CNFs,7.09mg/g at pH 7 for practical applications,Fe(OH)₃@CNFs is a good adsorbent for phosphate removal,because there is no need to adjust the pH,the cost and consumption of chemicals are reduced.

Key words: CNFs, TEMPO oxidation, modification, adsorption, phosphate removal

中图分类号:

X703.1

王婷庭, 刘敏, 崔桂榕, 陈滢. 五种改性纳米纤维素吸附剂的制备及除磷性能比较[J]. 化工进展, 2017, 36(11): 4279-4285.

WANG Tingting, LIU Min, CUI Guirong, CHEN Ying. Preparation of several modified cellulose nanofiber hybrid adsorbents and performance comparison of phosphate removals[J]. Chemical Industry and Engineering Progress, 2017, 36(11): 4279-4285.

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