Article
Microbiology
Maria L. Di Franca, Bruna Matturro, Simona Crognale, Marco Zeppilli, Edoardo Dell'Armi, Mauro Majone, Marco Petrangeli Papini, Simona Rossetti
Summary: This study describes the microbiome composition of a novel bioelectrochemical system (BES) for removing perchloroethylene using sequential reductive/oxidative dechlorination. The feeding composition affects the microbiome and the products of the dechlorination reaction.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Usman Farooq, Muhammad Sajid, Ali Shan, Xinhai Wang, Shuguang Lyu
Summary: The study found that the dual nature of cysteine can enhance the degradation of TCA in the Fe(II)/SPC system. The system showed excellent recyclability and stability characteristics, indicating its potential for real-time industrial applications.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Yu Yao, Yufeng Fu, Li Zhang, Lishuang Xuan, Chuanyu Qin
Summary: In this study, a novel and green Gemini surfactant, SNE(10)SID, was synthesized for the remediation of dense non-aqueous phase liquid-contaminated groundwater. The surfactant exhibited excellent activity under low temperature and high salt conditions, and showed a low adsorption loss. It also demonstrated a significantly higher PCE desorption ability compared to other monomeric surfactants. The total PCE removal rate reached 87.5% after 10 pore volumes of flushing.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Yufan Yuan, Fangling Guan, Chenglong Yu, Danping Li, Faying Lai, Huajun Huang, Jinbao He, Yanpeng Gao, Hansun Fang
Summary: Soil and sediment can naturally generate hydroxyl radicals (HO center dot) through Fenton or Fenton-like reactions, and the presence of organic ligands (OLs) can significantly enhance the generation of HO center dot. The moisture content in soil is a crucial factor for HO center dot generation. The release of Fe(II) from solid into the aqueous phase and the complexation reactions between Fe(II) and OLs contribute to the stimulation of HO center dot generation. However, certain OLs can suppress HO center dot generation by promoting other reactions. This study provides insights into how synthetic OLs affect HO center dot generation in soil and sediment, and suggests potential applications for in-situ Fenton reactions.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Hui Xia, Jungang Guo, Yuesuo Yang, Yuanyuan Wang, Zhongchang Wang, Xin Wang, Wenjing Zhang
Summary: This study developed a novel modified Fenton system using calcium peroxide and iron ions, and applied it to the removal of p-nitrophenol in groundwater. The results showed that the system could effectively remove p-nitrophenol under optimal conditions. The presence of hydroxyl radicals and singlet oxygen was confirmed, and possible degradation pathways were proposed. These findings provide important technical support for groundwater remediation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Manuel Dutschke, Tobias Schnabel, Frank Schuetz, Christian Springer
Summary: In this study, an experimental setup was developed to apply advanced oxidation processes to real groundwater, resulting in promising degradation rates of organic pollutants. Through parameter optimization, high degradation rates were achieved without the formation of transformation products.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Xueji You, Shuguang Liu, Erin C. Berns-Herrboldt, Chaomeng Dai, Charles J. Werth
Summary: This study investigates the role of reactive oxygen species, specifically center dot OH, in the oxidation of trichloroethene (TCE) in the presence of reduced iron minerals (RIM) and oxygen. Experimental results and kinetic modeling show that center dot OH production is dominated by free Fe(II) and that TCE competes with Fe(II) and organic matter for center dot OH. Further research is needed to confirm the identified reaction pathways and explore other potential mechanisms.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Jiong Gao, Roberta Frinhani Nunes, Kevin O'Shea, Greg L. Saylor, Lingjun Bu, Yu-Gyeong Kang, Xiaodi Duan, Dionysios D. Dionysiou, Shenglian Luo
Summary: This study investigates the impact of water quality parameters on the formation of radical anions and BPA degradation in UV/SPC and UV/H2O2 systems. The rise in pH decreases the steady state concentration of HO•, resulting in a decrease in BPA degradation rate.
Article
Engineering, Environmental
Junyi Huang, Yuanhao Zhou, Shimao Deng, Yangzi Shangguan, Ranhao Wang, Qiuyue Ge, Xuezhen Feng, Zhigang Yang, Yongfei Ji, Ting Fan, Baiyang Chen, Boqiang Li, Chunmiao Zheng, Xijun Hu, Hong Chen
Summary: Activation of persulfate by mixed redox-couple-involved chalcopyrite nanoparticles can decompose refractory organic compounds. The Cu(I)/Fe(III) redox couple in chalcopyrite plays a crucial role in this process.
Article
Engineering, Environmental
Tao Wang, Dongye Zhao, Jun Cao, Qiling Zeng, Wei Li, Bin Liu, Dan He, Yuanyuan Liu
Summary: This study found that FeS nanoparticles facilitated rapid Fenton-like reactions during the early stage of FeS oxygenation, leading to the rapid oxidation of Cr(III) to Cr(VI). However, as the reactions progressed, the oxidative potential was counteracted by competitive scavenging and reduction reactions. In equilibrium, all Cr(VI) was reduced back to Cr(III) at an FeS-Cr(III) molar ratio of 10:1, while a small fraction of Cr(VI) remained in solid products at a ratio of 1:1. Acidic conditions favored the generation of Cr(VI) and the equilibrium concentration was higher at pH 5.0 compared to pH 9.0.
Article
Chemistry, Multidisciplinary
Elkhir Ouahiba, Malika Chabani, Aymen Amin Assadi, Amrane Abdeltif, Fourcade Florence, Bouafia Souad
Summary: Different oxidation processes were studied to compare the removal efficiency of Oxytetracycline (OTC). The initial pH solution was found to have an important role in the photolysis of OTC. The addition of oxidants had an impact on mineralization. Quantification of the main radicals involved in the oxidation process was performed.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Engineering, Environmental
Chunyun Gu, Shuyu Liu, Jiarui Liang, Yuqian Wang, Shuyu Lu, Jie Ma
Summary: In this study, pyrite was used as an activator of sodium percarbonate for the degradation of 1,2,3-trichloropropane. The FeS2/SPC system showed a higher removal efficiency of TCP compared to the classic Fenton system. The reaction mechanism was elucidated through various tests and it was found that HO· and O2^-· played a role in TCP degradation, with HO· being more important. The presence of S elements in pyrite promoted the regeneration of Fe2+ and enhanced TCP degradation. The TCP removal efficiency was influenced by the concentrations of pyrite and SPC, as well as the particle size and pH of pyrite.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Marco Zeppilli, Bruna Matturro, Edoardo Dell 'Armi, Lorenzo Cristiani, Marco Petrangeli Papini, Simona Rossetti, Mauro Majone
Summary: A bioelectrochemical process combining two membrane-less reactors equipped with graphite granules counter electrode was developed for perchloroethylene removal. The reductive reactor completely reduced PCE into VC and Eth, which were efficiently removed by the oxidative reactor. Different redox niches in each compartment allowed the co-existence of both reducing and oxidative reactions, enhancing the overall efficiency of PCE removal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Xuecheng Sun, Xiaogang Gu, Shuguang Lyu
Summary: The study compared the degradation performances of chlorobenzene using different oxidants activated with ferrous iron. The results showed that increasing the dosage of oxidants or Fe(II) improved the removal rate of chlorobenzene. Optimal molar ratios were determined for each system, with pH conditions significantly affecting the degradation performance. Hydroxyl radicals and singlet oxygen were detected, and the pathways of chlorobenzene degradation were proposed, highlighting the innovative role of singlet oxygen in the mechanism. Additionally, the adverse effects of complex groundwater matrices could be overcome by increasing the molar ratio of oxidant/Fe(II)/chlorobenzene.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Yulong Liu, Xianxian Sheng, Zhikang Zhou, Peng Wang, Zhanpeng Lu, Jiaqi Dong, Yong Sun, Shuguang Lyu
Summary: In this study, FeS2 was used as a catalyst to activate nano calcium peroxide (nCP) for the degradation of naphthalene (NAP). The results showed that the nCP/FeS2 system could efficiently degrade NAP under optimal conditions and could tolerate complex solution conditions. The main radical responsible for NAP degradation was identified. Gas chromatography-mass spectrometry (GC-MS) was used to detect NAP degradation intermediates and reveal the possible degradation pathways. The nCP/FeS2 system also showed broad-spectrum reactivity in the degradation of other organic pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
