摘要
以零价铁(ZVI)和硫化亚铁(FeS)为原料,在无惰性气体保护的条件下,通过球磨法制备了硫化微米零价铁(S-mZVI)。考察了S-mZVI对水中1,1,2,2-四氯乙烷(TeCA)的降解效果,并研究了制备条件、S-mZVI投加量、初始TeCA质量浓度、pH和地下水常见阴离子(HCO_(3)^(-)、Cl^(-)、SO_(4)^(2-)和NO_(3)^(-))的影响。结果表明,当初始TeCA浓度小于20 mg·L^(-1)时,其首先以非还原脱氯化氢降解为三氯乙烯(TCE);而初始TeCA浓度较高时,则以还原β-消除降解为二氯乙烯(DCE)。普通地下水的pH和HCO_(3)^(-)浓度变化均对较低浓度的TeCA及TCE的降解速率影响不大。地下水中的SO_(4)^(2-)和NO_(3)^(-)会加速S-mZVI对TeCA的降解,而Cl^(-)则会抑制TeCA的降解。NO_(3)^(-)会显著消耗S-mZVI,降低TCE的降解速率。上述结果可望为球磨S-mZVI的规模化生产和实际应用提供支撑。
Sulfidated microscale zero-valent iron(S-mZVI)was prepared under aerobic conditions by ball milling method,which was used for degradation of 1,1,2,2-tetrachloroethane(TeCA),and the influencing factors,including preparation conditions,S-mZVI dosage,initial TeCA concentration,pH and common anions in groundwater(HCO_(3)^(-),Cl^(-),SO_(4)^(2-)and NO_(3)^(-))were investigated.The results showed that TeCA was firstly degraded into trichloroethylene(TCE)by non-reductive dehydrochlorination at an initial concentration below 20 mg·L^(-1),while a reductive β-elimination reaction from TeCA to dichloroethylene(DCE)was observed as the initial concentration increased.The degradation rates of TeCA and TCE at low concentrations were not significantly affected by the variation in pH and HCO_(3)^(-)levels under topical groundwater conditions.However they were accelerated by SO_(4)^(2-)and NO_(3)^(-),and inhibited by Cl^(-).The S-mZVI would be substantially consumed by NO_(3)^(-)resulting in a reduction of TCE degradation.The above results are expected to support the full-scale production and practical application of ball-milled S-mZVI.
作者
刘隆超
杨进
王岽
LIU Longchao;YANG Jin;WANG Dong(SINOPEC Beijing Research Institute of Chemical Industry Co.,Ltd.,Beijing 100013,China)
出处
《环境工程学报》
北大核心
2025年第9期2257-2269,共13页
Chinese Journal of Environmental Engineering
基金
中国石油化工股份有限公司科技开发资助项目(324102)。
关键词
硫化微米零价铁
1
1
2
2-四氯乙烷
球磨
地下水
氯代烃
sulfided microscale zero-valent iron
1,1,2,2-tetrachloroethane
ball milling
groundwater
chlorinated hydrocarbons
