title: Effects of clay minerals on diethyl phthalate degradation in Fenton reactions.
abstract: Phthalate esters are a group of plasticizers, which are commonly detected in China's soils and surface water. Fenton reactions are naturally occurring and widely applied in the degradation of contaminants. However, limited research was considered the effects of clay minerals on contaminants degradation with OH oxidation. In this study, batch experiments were conducted to investigate the degradation of diethyl phthalate (DEP) in Fenton reactions in the presence of clay minerals, and the effects of clay type, Fe content in clay structure. The results showed the clay adsorption inhibited total degradation of DEP, and Fe content in clay structure played an important role in DEP degradation, including in solution and adsorbed in clay minerals. Clay minerals with less Fe content (<3%) quenched OH radical, while nontronite with Fe content 19.2% improved OH radical generation and accelerated DEP degradation in solution. The degradation of clay-adsorbed DEP was much slower than DEP in solution. Six main products of DEP degradation were identified, including monoethyl phthalate, phthalate acid, hydroxyl diethyl phthalate, etc. This study implied that phthalate ester's degradation would be much slower in natural water than expected in the presence of clay minerals.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71. East Beijing Road, Nanjing, Jiangsu Province 210008, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China. Electronic address: dawayn@163.com.
authors.forename: Ning
authors.initials: N
authors.lastname: Chen
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71. East Beijing Road, Nanjing, Jiangsu Province 210008, PR China. Electronic address: gdfang@issas.ac.cn.
authors.forename: Guodong
authors.initials: G
authors.lastname: Fang
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71. East Beijing Road, Nanjing, Jiangsu Province 210008, PR China. Electronic address: dmzhou@issas.ac.cn.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71. East Beijing Road, Nanjing, Jiangsu Province 210008, PR China. Electronic address: juangao@issas.ac.cn.
authors.forename: Juan
authors.initials: J
authors.lastname: Gao
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D002681:China; D000077215:Clay; D006861:Hydrogen Peroxide; D017665:Hydroxyl Radical / Q000737:chemistry*; D007501:Iron; D008903:Minerals / Q000737:chemistry*; D010084:Oxidation-Reduction; D010795:Phthalic Acids / Q000378:metabolism*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; C045076:Fenton's reagent; D008903:Minerals; D010795:Phthalic Acids; D012989:Soil Pollutants; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron; D000077215:Clay; C007379:diethyl phthalate
keywords: Clay mineral; Fenton reactions; Hydroxyl radical; Phthalate ester