改性竹炭基水凝胶去除水溶液中的亚甲基蓝。
Removal of methylene blue from aqueous solution by modified bamboo hydrochar.
机构信息
Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an, Zhejiang 311300, PR China.
Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an, Zhejiang 311300, PR China; Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization, Zhejiang A & F University, Lin'an, Zhejiang 311300, PR China; Zhejiang provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Hangzhou, Zhejiang 310023, PR China.
出版信息
Ecotoxicol Environ Saf. 2018 Aug 15;157:300-306. doi: 10.1016/j.ecoenv.2018.03.088. Epub 2018 Apr 6.
Four hydrochars (labeled as HC, AHC, MHC, and MAHC, respectively) were prepared by hydrothermal carbonization of bamboo with and without chlorane or followed by NaOH modification. Various techniques were adopted to characterize the physicochemical properties of hydrochars and the removal of methylene blue (MB) by these hydrochars from aqueous solution was investigated. The MB adsorption isotherm and kinetic onto MAHC and MHC can be preferably interpreted by Langmuir adsorption mode and the pseudo-second-order model, respectively. Thermodynamic parameters implied that adsorption was a spontaneous and exothermic process. The adsorption capacity of MAHC was 655.76 mg g, which was 2-3 times compared to that of MHC (268.93 mg g) at 303 K. The high adsorption capacity of MAHC for MB suggests that hydrothermal carbonization in acidic medium followed by alkaline treatment has the potential application to produce efficient MB adsorbents used in wastewater treatment.
四种水炭（分别标记为 HC、AHC、MHC 和 MAHC）是通过在有和没有氯烷的情况下对竹子进行水热碳化，然后用氢氧化钠进行改性而制备的。采用各种技术对水炭的物理化学性质进行了表征，并研究了这些水炭从水溶液中去除亚甲蓝（MB）的情况。MAHC 和 MHC 对亚甲蓝的吸附等温线和动力学可以通过 Langmuir 吸附模式和准二级模型来更好地解释。热力学参数表明吸附是一个自发的放热过程。MAHC 的吸附容量为 655.76mg/g，在 303K 时，其吸附容量是 MHC（268.93mg/g）的 2-3 倍。MAHC 对 MB 具有高吸附容量，表明在酸性介质中进行水热碳化，然后进行碱性处理，具有潜在的应用前景，可以生产用于废水处理的高效 MB 吸附剂。
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