摘要
本研究采用在高温下煅烧鱼腥草,用HNO3处理制备吸附剂。在以空气为载气的条件下用SHMADZU DTG-60差热-热重分析仪得到鱼腥草的最佳热解温度为476℃,XRD分析结果表明其主要由半晶体涡轮层炭和一些矿物质组成,傅里叶红外光谱分析（FTIR）表明其表面的芳香环和吡啶环的C═C和O─H伸缩振动位移较大,可能是吸附活性位。单因素实验结果表明在p H为1、吸附剂用量为0.3 g、吸附时间为120 min时对Cr（Ⅵ）去除率最高,达到99.2%。用Langmuir和Freundlich吸附模型对该吸附过程进行拟合,发现鱼腥草生物炭对Cr（Ⅵ）的吸附更符合Langmuir吸附模型。此外,吸附热力学研究结果表明该吸附为自发过程。
A biochar was made from houttuynia cordata by calcining at high temperature and treating with HNO3. Under the optimum pyrolysis temperature of houttuynia cordata, 476 ℃, was determined by a differential heat-thermogravimetric analyzer （SHMADZU DTG-60） with air as the carry gas. The XRD analyses showed that the biochar was mainly composed of semi-crystalline turbine layer carbons and some minerals; the Fourier transform infrared spectroscopy （FTIR） analyses showed that stretching vibrations C - C and O-H in aromatic and pyridine rings were quite strong, standing of the possible active adsorption sites. The designed adsorption experiments showed that, when pH= 1, adsorption time was 120 min and sorbent dosage was 0. 3 g, the Cr （Ⅵ） removal rate was the best （ 99.2% ）. It was found that the adsorption of Cr （ Ⅵ ） on the houttuynia cordata biochar followed the Langmuir adsorption model better than the Freundlieh adsorption model, and that the adsorption was a spontaneous process.
作者
严云
余晓燕
刘洪
曹芮
靳必强
李松
YAN Yun;YU Xiaoyan;LIU Hong;CAO Rui;JIN Biqiang;LI Song(Department of Resources and Environment of Xichang College,Sichuan Xichang 615013,China;Department of Science of Xichang College,Sichuan Xichang 615013,China;School of Chemistry ＆ Chemical Engineering,Mianyang Normal University,Sichuan Mianyang 621000,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2018年第4期396-402,共7页
Earth and Environment
基金
四川省教育厅科研项目(17ZB0402)
西昌市教育和科学技术局项目(16JSYJ04)
凉山州学术和技术带头人培养资金受助项目(ZXS201705)
四川省大学生创新创业训练项目(201610628045)
关键词
鱼腥草
生物炭
Cr(Ⅵ)
动力学
热力学
houttuynia cordata
biochar
chromium （Ⅵ）
kinetics
thermodynamics
