生物炭负载纳米零价铁对水体中对氯苯胺的去除效果及机理
肖艳琳 , 陈润泽 , 孙浩欣 , 田耀宇 , 汤波
现代化工 ›› 2026, Vol. 46 ›› Issue (4) : 191 -197.
生物炭负载纳米零价铁对水体中对氯苯胺的去除效果及机理
Removal performance and mechanism of p-chloroaniline in aqueous solution by biochar-loaded nano-zero-valent iron
以水稻秸秆生物炭(BC)和七水合硫酸亚铁(FeSO4·7H2O)为原材料、硼氢化钠(NaBH4)为还原剂制备了生物炭负载纳米零价铁(nZVI/BC)材料。考察了制备过程中铁碳比对nZVI/BC吸附特性的影响,结果显示在温度为25℃、pH=7、投加量为0.30 g/L、铁碳比为2∶1的情况下,2nZVI/1BC对对氯苯胺(PCA)的最大吸附量为162.73 mg/g。2nZVI/1BC对PCA的吸附符合准二级动力学模型和Langmuir模型,说明对PCA的吸附过程主要是化学吸附和单分子层吸附;吸附解吸实验结果表明BC、nZVI、2nZVI/1BC对PCA的解吸率均极低(小于1.5%);负载BC后有效抑制了材料的老化,老化15天后对PCA的去除率仍有77%;经Zeta电位测定、L-H模型拟合、吸附后材料表征和高效液相色谱测定发现,2nZVI/1BC对PCA的去除除吸附外还存在静电吸引作用、氧化降解作用与还原脱氯作用。
Biochar-loaded nano-zero-valent iron (nZVI/BC) materials were prepared by using rice straw biochar (BC) and ferrous sulfate heptahydrate (FeSO4·7H2O) as raw materials and sodium borohydride (NaBH4) as reducing agent.The effect of iron-carbon ratio on the adsorption characteristics of the prepared nZVI/BC was investigated.The results showed that the maximum adsorption capacity of 2nZVI/1BC for p-chloroaniline (PCA) was 162.73 mg/g at 25℃,pH=7,dosage of 0.30 g/L and iron-carbon ratio of 2∶1.The adsorption of PCA by 2nZVI/1BC conforms to the pseudo-second-order kinetic model and Langmuir model,indicating that the adsorption process of PCA is mainly chemical adsorption and monolayer adsorption.The results of adsorption and desorption experiments showed that the desorption rates of PCA by BC,nZVI and 2nZVI/1BC were extremely low (less than 1.5%).After loading BC,the aging of the material was effectively inhibited,and the removal rate of PCA was still more than 77% after 15 days of aging.The results of ZETA potential measurement,L-H model fitting,material characterization after adsorption and high performance liquid chromatography showed that the removal of PCA by 2nZVI/1BC had electrostatic attraction,oxidative degradation and reductive dechlorination in addition to adsorption.
生物炭 / 去除机理 / 对氯苯胺 / 复合材料 / 纳米零价铁
biochar / removal mechanism / p-chloroaniline / composite materials / nano zero-valent iron
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