Removal of methylene blue from aqueous solution by modified bamboo hydrochar.
Removal of methylene blue from aqueous solution by modified bamboo hydrochar.
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DOI：
10.1016/j.ecoenv.2018.03.088
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发表时间：
2018-08
影响因子：
6.8
通讯作者：
W. Qian;Xiping Luo;Xing Wang;M. Guo;Bing Li
中科院分区：
文献类型：
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作者：
W. Qian;Xiping Luo;Xing Wang;M. Guo;Bing Li
以竹子为原料，分别在氯烷存在下、氯烷不存在下和氢氧化钠改性后进行水热碳化，制备了HC、AHC、MHC和MAHC四种氢焦。采用多种技术表征了水热炭的理化性质，并研究了水热炭对亚甲基蓝（MB）的去除效果。MB在MAHC和MHC上的吸附等温线和动力学分别可用Langmuir吸附模型和准二级动力学模型解释。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655.76 mg g−1，是303 K时MHC的吸附容量（268.93 mg g−1）的2-3倍。MAHC对MB的高吸附容量表明，在酸性介质中水热碳化，然后碱处理具有潜在的应用，以生产用于废水处理的高效MB吸附剂。
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−1, which was 2–3 times compared to that of MHC (268.93 mg g−1) 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.