摘要
研究了采用剪切强化法制备高比表面积针铁矿,借助X-射线衍射仪、扫描电子显微镜、氮气物理性吸附等手段表征针铁矿的微观结构,通过单因素试验考察了溶液初始pH、吸附时间、温度、初始F^(-)质量浓度、针铁矿用量、共存阴离子等对针铁矿吸附F^(-)的影响。结果表明:所制备的针铁矿比表面积高达206.91 m^(2)/g,对F^(-)有很强的吸附能力;在初始pH=4、温度25℃、针铁矿用量10 g/L条件下,对F^(-)质量浓度100 mg/L的溶液吸附处理2 h,其对F^(-)吸附率达92.2%,吸附量为9.22 mg/g;溶液中Cl^(-)和NO^(-)_(3)的存在对吸附影响不大,而SO^(2-)_(4)会通过竞争作用抑制针铁矿对F^(-)的吸附。
The goethite with high specific surface was prepared by shearing-enhanced method.The goethite microstructure was characterized by X-ray diffraction,scanning electron microscopy and nitrogen adsorption.The effects of initial solution pH,adsorption time,temperature,initial F^(-)concentration,goethite dosage and coexisting anions on adsorption of F^(-)were examined by single factor experiments.The results show that the specific surface area of goethite is 206.91 m^(2)/g,and the goethite has a stronger adsorption capacity for F^(-).The adsorption rate and adsorption capacity are 92.2%and 9.22 mg/g,respectively,under the conditions of initial solution pH of 4,reaction time of 2 h,F^(-)mass concentration of 100 mg/L,reaction temperature of 25℃,and goethite dosage of 10 g/L.In addition,Cl^(-)and NO_(3)^(-)in the solution has less impact on adsorption of F^(-),while SO^(2-)_(4) affects adsorption efficiency significantly.
作者
龙伟
杨建广
唐施阳
南天翔
唐朝波
曾伟志
LONG Wei;YANG Jianguang;TANG Shiyang;NAN Tianxiang;TANG Chaobo;ZENG Weizhi(School of Metallurgy and Environment,Central South University,Changsha 410083,China)
出处
《湿法冶金》
CAS
北大核心
2022年第1期61-67,共7页
Hydrometallurgy of China
基金
国家重点研发专项课题(2018YFC1900403)
中南大学中央高校基本科研业务费专项资金资助项目(2020zzts480)。
关键词
剪切强化
高比表面积
针铁矿
氟
吸附
shearing-enhanced
high specific surface area
goethite
fluoride
adsorption
