摘要
采用水热炭化的方法制备柚子皮水热炭吸附剂,用红外光谱仪和氮吸附仪测定水热炭表面的官能团和孔结构,考察了吸附剂用量、溶液pH值、Cr(Ⅵ)初始浓度、吸附时间对吸附Cr(Ⅵ)的影响。结果表明:水热炭是典型的介孔材料且有较多的含氧官能团,有利于Cr(Ⅵ)的吸附。溶液pH值小于7时,吸附效果较好;当溶液中Cr(Ⅵ)离子的初始浓度为50mg·L^(-1),pH=6,吸附剂用量为0.4 g·(50 mL)^(-1)、吸附时间为90 min时、水热炭对Cr(Ⅵ)的吸附率和吸附量分别为99.03%、6.19 mg·g^(-1)。柚子皮水热炭对Cr(Ⅵ)的吸附过程符合准二级吸附动力学模型,且35、45、55℃的等温吸附数据拟合结果表明等温吸附过程符合Freundlich模型。
An absorbent was prepared from shaddock peel by hydrothermal carbonization and characterized by Fourier transform infrared（FT-IR） spectroscopy and N2 physical adsorption analysis.The influence of different parameters on the removal of Cr（Ⅵ） was investigated.The results show that the hydrothermal carbon is mesoporous and contains many oxygen-containing functional groups,which is advantageous for Cr（Ⅵ） adsorption.The adsorption is better when the pH is below 7.When the initial Cr（Ⅵ） concentration is 50 mg·L^（-1）,the pH is 6,the adsorbent dosage is 0.4 g·（50 mL）^（-1）,and the contact time is 90 min,the Cr（Ⅵ） removal percentage and adsorption capacity of hydrothermal carbon are 99.03% and 6.19 mg·g^（-1）,respectively.The adsorption reaction is best described by the pseudo-second-order model,and the adsorption isotherm data at 35,45,and 55 ℃show that the adsorption process follows the Freundlich isotherm model.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第5期2731-2737,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(U1361119
51404098
51174077)
河南省高校科技创新团队资助(16IRTSTHN005)
河南省自然科学基金资助(162300410115)
煤炭安全生产河南省协同创新中心资助
关键词
柚子皮
水热炭
Cr(Ⅵ)
吸附
shaddock peel
hydrothermal carbon
Cr（Ⅵ）
adsorption
