摘要
吸附法因具有处理设备简单、无二次污染等优点广泛应用于废水处理中。以核桃果皮基活性炭为吸附剂,研究其对苯酚吸附的热力学性质。结果表明,温度对吸附无显著影响,在20~60℃范围内,随温度升高,吸附量略有减小;苯酚溶液在酸性至中性条件下的吸附去除率较高。吸附符合经典的Langmuir与Freundlich等温方程,并存在吸附剂和吸附质浓度效应,Langmuir与Freundlich等温方程参数不确定为常数,而是随吸附质质量浓度ρ0和吸附剂质量浓度W0变化而变化。研究表明,核桃果皮基活性炭能高效、快速地吸附去除苯酚,是一种有应用前景的净水材料。
The paper is to present the results of our investigative experiment research over the thermodynamic principle of the phenol adsorbed by the walnut peel-activated carbon content. As is known,we have managed to apply the walnut peel for preparing a kind of walnut peel-activated carbon agent in the muffle furnace.The results of our experiments show that the specific surface area of the agent is 1 359. 54 m2/ g. The internal surface area can be made to reach 622. 94 m2/ g with an external surface area being736. 60 m2/ g. The total pore volume is 1. 111 7 m L / g. The other detailed data with the agent can be illustrated as follows： the mesopore volume is as high as 0. 815 1 m L / g and micropore volume is 0. 272 2 m L / g. The mesopore rate has been made to reach73. 32% with the average aperture being 3. 27 nm. However,there has not been any report on the preparation of the activated carbon with walnut peel（ walnut peel-activated carbon） and its application. All in all,our research focus has still been focused on the thermal properties in the process of adsorbing phenol when trying to use the walnut peel-activated carbon content as an adsorbent. The results of our simulated experiments indicate that when the time of the adsorption is beyond 120 min,the adsorption would like to reach the state of saturation. In addition,it has been proved that the temperature has no obvious effects on the absorption. In a range of temperature 20-60 ℃,there can be found a slight reduction of the adsorption with the rise of temperature.What is more,it would be available for the p H value of the phenol to improve the removing rate in the acidic or neutral solution.What is more,the absorption process has been verified to be conformed with the classic Langmuir and Freundlich isotherm equation. In addition,the adsorbent concentration effect and the adsorbate concentration effect prove to exist in the adsorption system. At the same time,the classic parameters of Langmuir and Freundlich isothermal equations fail to prove always being
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第4期236-239,共4页
Journal of Safety and Environment
基金
国家自然科学基金项目(21377107)
陕西省科技厅项目(2012JQ7012)
陕西省教育厅项目(11JK0758)
延安市科技项目(2013-KZDG11)
关键词
环境工程学
应用化学
核桃果皮
活性炭
苯酚
吸附
热力学
environmental engineering
applied chemistry
walnut peel
activated carbon
phenol
adsorption
thermodynamics
