秸秆生物炭对尼泊金乙酯的吸附特性研究

张 娱<sup>1; 2; 3; 4</sup>; 陈 琦<sup>1; 2; 3; 4</sup>; 唐志书<sup>1; 2; 3; 4*</sup>; 李 渊<sup>1; 2; 3; 4</sup>; 刘世军<sup>1; 2; 3; 4</sup>

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秸秆生物炭对尼泊金乙酯的吸附特性研究
张娱^1,2,3,4, 陈琦^1,2,3,4, 唐志书^1,2,3,4*, 李渊^1,2,3,4, 刘世军^1,2,3,4
1. 陕西中医药大学, 陕西咸阳 712083;2. 陕西省中药资源产业化协同创新中心, 陕西咸阳 712083;3. 陕西省中药基础与新药研究重点实验室, 陕西咸阳 712083;4. 陕西省风湿与肿瘤类中药制剂工程技术研究中心, 陕西咸阳 712083

摘要:

为促进秸秆的资源化利用,该研究以甘蔗渣、茄子秸秆、玉米芯为材料,采用慢速热解技术于500 ℃条件下制备甘蔗渣生物炭(SBC)、茄子秸秆生物炭(EBC)、玉米芯生物炭(CBC),检测其去除水中尼泊金乙酯的特性。结果表明:(1)生物炭的制备原料显著影响其对尼泊金乙酯的吸附效果,三种秸秆制备的生物炭对尼泊金乙酯的吸附能力表现为SBC>EBC>CBC; 此外,水中尼泊金乙酯的初始浓度、吸附温度和时间等因素均能影响吸附效果。(2)三种生物炭对尼泊金乙酯的去除率随尼泊金乙酯初始浓度的增加而降低,高温有利于吸附; 45 ℃下尼泊金乙酯初始浓度为30 mg·L^-1时,甘蔗渣生物炭(SBC)对尼泊金乙酯的去除率最高,达99.7%; 反应在最开始的120 min内增加迅速,经过270 min达到吸附平衡。(3)生物炭对尼泊金乙酯的等温吸附线符合Langmuir模式和Freundlich模式。这为农业秸秆废弃物应用于尼泊金乙酯等有机污染物的去除提供了理论依据。

关键词: 生物炭, 甘蔗渣, 茄子秸秆, 玉米芯, 尼泊金乙酯

DOI：10.11931/guihaia.gxzw201805042

分类号:Q946, X131

文章编号:1000-3142(2019)07-0873-07

Fund project:国家自然科学基金( 51679085); 陕西中医药大学科研基金(2015PY10)[Supported by the National Natural Science Foundation of China(51679085); Science Foundation of Shaanxi University of Chinese Medicine(2015PY10)]。

Adsorption characteristics of ethyl paraben from aqueous solution using straw biochar

ZHANG Yu^1,2,3,4, CHEN Qi^1,2,3,4, TANG Zhishu^1,2,3,4*, LI Yuan^1,2,3,4, LIU Shijun^1,2,3,4

1. Shaanxi University of Chinese Medicine, Xianyang 712083, Shaanxi, China;2. Shaanxi Collaborative Innovation Center of Chinese Medicinal Resource Industrialization, Xianyang 712083, Shaanxi, China;3. Shaanxi Province Key Laboratory of New Drugs and Chinese Medicine Foundation Research, Xianyang 712083, Shaanxi, China;4. Shaanxi Rheumatism and Tumor Center of TCM Engineering Technology Research, Xianyang 712083, Shaanxi, China

Abstract:

To promote the utilization of straw in resources, sugarcane residue, eggplant straw,corn straw was used as raw material to prepare the biochar adsorbent at 500 ℃, which were named sugarcane residue biochar(SBC), eggplant straw biochar(EBC)and corn straw biochar(CBC). Biochar is a carbon-rich product of biomass produced by thermal decomposition under limited oxygen supply at a relatively low temperature. Ethyl paraben was subject to batch adsorption in aqueous medium by the prepared biochar. The results of adsorption experiments were as follows:(1)The kind of raw materials significantly affected its adsorption effect on ethyl paraben. The adsorption capacity of ethyl paraben from three kinds of biochar was SBC>EBC>CBC. In addition, the initial concentration of ethyl paraben in waste water, the temperature and time of adsorption can also affect the adsorption effect.(2)The removal rates of ethyl paraben by three biochar decreased with increasing initial concentration of ethyl paraben. High temperature was beneficial to adsorption. When the initial concentration of ethyl paraben was 30 mg·L^-1 and the adsorption temperature was 25 ℃, the removal rate of ethyl paraben was up to 99.7% after SBC adsorption. The reaction increased rapidly at the beginning of 120 min and reached the adsorption equilibrium after 270 min.(3)The isothermal adsorption line for ethyl paraben conforms to the Langmuir mode and the Freundlich mode. The results provided a theoretical reference for the removal of organic pollutants such as ethyl paraben.

Key words: biochar, sugarcane residue, eggplant straw, corn straw, ethyl paraben