摘要
为利用浒苔处理含Cr(Ⅵ)废水,对浒苔进行了盐酸改性,通过间歇吸附试验研究了pH值、盐酸改性浒苔投加量、吸附时间及温度对盐酸改性浒苔吸附Cr(Ⅵ)的影响.结果表明:使用盐酸改性浒苔作为吸附剂去除废水中Cr(Ⅵ)的方法是可行的,酸性条件有利于Cr(Ⅵ)的吸附,当pH值为1、Cr(Ⅵ)初始质量浓度为100 mg/L时,去除率可达99.7%;准二级动力学方程能更好地拟合试验数据,颗粒内扩散阻力比外部传质阻力的影响更显著;吸附等温线数据更符合Langmuir模型,吸附吉布斯自由能为负值,而吸附焓变为正值,盐酸改性浒苔吸附剂对Cr(Ⅵ)的吸附是自发的吸热过程.
In order to treat wastewater containing Cr(Ⅵ) by Enteromorpha prolifera, hydrochloric acid was used to modify Enteromorpha prolifera. The effects of pH value, dosage of hydrochloric acid modified Enteromorpha prolifera, adsorption time and temperature on the adsorption of Cr(Ⅵ) by hydrochloric acid modified Enteromorpha prolifera were studied through batch adsorption tests. The results show that the method of remo Ⅵ ng Cr (Ⅵ) from wastewater by using hydrochloric acid modified Enteromorpha prolifera as adsorbent is feasible. The acidic condition is conducive to the adsorption of Cr(Ⅵ). When the initial mass concentration of Cr(Ⅵ) is 100 mg/ L and the pH value is 1, the removal rate can reach 99. 7%. The quasi-second-order dynamic equation can better fit the experimental data. The effect of diffusion resistance in particles is more significant than that of external mass transfer resistance. The adsorption isotherm data are more consistent with Langmuir model. The Gibbs free energy of adsorption is negative while the enthalpy of adsorption is positive. The adsorption of Cr(Ⅵ) by hydrochloric acid modified Enteromorpha prolifera adsorbent is a spontaneous endothermic process.
作者
王有丽
孙文寿
孙文静
WANG Youli;SUN Wenshou;SUN Wenjing(College propertytest of Environmental Science and Engineering,Qingdao University,Qingdao 266071,China)
出处
《水资源保护》
CAS
CSCD
北大核心
2019年第5期108-113,共6页
Water Resources Protection
关键词
Cr(Ⅵ)
改性浒苔
盐酸
吸附性能
Cr(Ⅵ)
modified Enteromorpha prolifera
hydrochloric acid
adsorption property
