Article
Engineering, Environmental
Lucia Mateus, Alicia Torres-Alcazar, Maria Victoria Lopez-Ramon, Miguel Angel Alvarez, Carlos Moreno-Castilla
Summary: MnFe2O4 solid nanospheres were synthesized and used as catalyst to activate PMS, degrading and mineralizing PNP effectively. The study showed excellent catalytic performance and reusability of the MSN catalyst, with complete PNP removal and high organic carbon removal efficiency. The degradation pathway and stability of the catalyst were also confirmed by the analysis of degradation products and characterization of fresh and used catalysts.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Pijun Duan, Xinning Liu, Binhua Liu, Muhammad Akram, Yanwei Li, Jingwen Pan, Qinyan Yue, Baoyu Gao, Xing Xu
Summary: The presence of phosphate was found to increase the effectiveness of PMS activation for pollutants removal in AOPs, promoting the generation of SO4 center dot- through efficient breaking of the O-O bond of PMS. The yields of SO4 center dot- were linearly dependent on phosphate concentration, while the yields of .OH remained constant.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Yang Zhou, Yuan Gao, Jin Jiang, Yong-Ming Shen, Su-Yan Pang, Yang Song, Qin Guo
Summary: The study compared the oxidation of a model fluoroquinolone antibiotic levofloxacin (LEV) by permanganate (Mn(VII)) and peroxymonosulfate (PMS), showing that both oxidants can efficiently eliminate the antibiotic activity of LEV with slightly different mechanisms. Additionally, benzo-quinone was found to have an activating effect on both PMS and Mn(VII) oxidation, although their activation mechanisms were distinct.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Kubra Ulucan-Altuntas, Senem Yazici Guvenc, Emine Can-Guven, Fatih Ilhan, Gamze Varank
Summary: This study investigated the degradation of oxytetracycline by heat-activated peroxydisulfate and peroxymonosulfate processes. Response surface methodology was used to evaluate the effect of process parameters on oxytetracycline removal efficiency, showing significant results for both processes. The predicted oxytetracycline removal efficiencies for the PDS and PMS processes were 89.7% and 84.0%, respectively, with the PDS process having higher kinetic constants at all pH values than the PMS process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Liu-Xi Yang, Jia-Cheng E. Yang, Ming-Lai Fu
Summary: Porous magnetic CoFe2O4 nanocrystals were synthesized using bimetal-organic framework as a precursor and used as catalysts for the removal of chloramphenicol. The CoFe2O4 NCs showed high degradation efficiency and removal of total organic carbon during the removal of CAP.
Article
Engineering, Environmental
Huixuan Zhang, Chenghan Xie, Long Chen, Jun Duan, Fan Li, Wen Liu
Summary: Hydroxyl radical (center dot OH) and sulfate radical (SO4 center dot-) have been widely studied in advanced oxidation processes (AOPs) for organic pollutants degradation. In this study, a Co(II)/peroxymonosulfate activation system was established to degrade caffeine (CAF), and the different attack routes of SO4 center dot- and center dot OH were explored. It was found that SO4 center dot- is more likely to attack CAF kinetically, while only center dot OH can react via hydrogen atom abstraction (HAA) route. Radical adduct formation (RAF) is the most favorable route for both center dot OH and SO4 center dot- attack. These findings provide insights into the degradation mechanism of organic pollutants in AOPs driven by center dot OH and SO4 center dot-.
Article
Engineering, Chemical
Yang You, Zhuanjun Zhao, Yiran Song, Jing Li, Jie Li, Xiuwen Cheng
Summary: The magnetized nitrogen-doped biochar (MNBC) as an activator of peroxymonosulfate (PMS) showed high efficiency in degrading ciprofloxacin hydrochloride (CIP) and exhibited stability. The system displayed superior CIP removal efficiency, with sulfate radicals and hydroxyl radicals as the dominant reactive oxide species. Furthermore, the MNBC/PMS system's excellent magnetic properties allowed for easy separation and recovery, with a proposed catalytic mechanism involving the generation of sulfate radicals and hydroxyl radicals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Chao He, Chunyan Tang, Wen-Da Oh
Summary: This study investigates the use of manganese cobalt oxide nanoparticles-decorated functionalized multi-walled carbon nanotubes (MnCo2O4/FCNTs) as a peroxymonosulfate (PMS) activator for efficient degradation of ibuprofen (IBU). The MnCo2O4/FCNTs demonstrated excellent catalytic activity under various environmental conditions and exhibited high stability for PMS activation. The study provides practical knowledge for IBU removal using MnCo2O4/FCNTs for PMS activation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Na Qiu, Chanchan Shen, Yongxia Liu, Xiuqing Li, Guangyin Jia, Jingping Qin, Xinglei Wang
Summary: This study investigated the degradation mechanism of ibuprofen in aqueous solutions and the factors influencing the degradation process, and proposed a possible degradation pathway. The results showed that ferric ion activated peroxydisulfate coupled with electro-oxidation could effectively remove ibuprofen from water bodies.
Article
Engineering, Environmental
Jiaqi Ren, Ying Huang, Jiani Yao, Shujie Zheng, Yingjie Zhao, Yang Hou, Bin Yang, Lecheng Lei, Zhongjian Li, Dionysios D. Dionysiou
Summary: This study investigated the mechanisms of generating reactive species for the degradation of micropollutants through the activation of peroxymonosulfate (PMS) by phosphate. The formation of hydrogen bonds between phosphate and PMS molecules was found to be crucial in the overall reactions, favoring the production of (OH)-O-center dot and reactive phosphate species (RPS) over SO4 center dot-. HPO4 center dot- was identified as the dominant radical in the phosphate/PMS system, showing high potential in micropollutant decomposition. In addition, the degradation pathways of various micropollutants in the system were proposed, and the potential environmental impacts were evaluated through cytotoxicity analysis. This study highlights the significance of RPS in the degradation of micropollutants during PMS-based treatment in phosphate-rich scenarios.
Article
Engineering, Environmental
Hengduo Xu, Yanqing Sheng
Summary: In this study, a FeS-based PMS system was developed for efficient degradation of antibiotics. Reactive species including SO4?- and ?OH were identified, along with Fe(IV), with FeS/PMS system showing effectiveness in both simulated and real surface waters. The reaction pathways involving multiple reactive species were proposed, demonstrating the potential engineering applications in antibiotic degradation and water quality remediation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Wanlin Yang, Zejun Deng, Libin Liu, Kechao Zhou, P. E. Sharel, Lingcong Meng, Li Ma, Qiuping Wei
Summary: This study introduces a highly-efficient coupled advanced oxidation process called Electro-Oxidation-Persulfate-Electro-Fenton (EO-PS-EF), which utilizes reactive hydroxyl and sulfate radicals to effectively remove diverse contaminants. The EO-PS-EF system demonstrates a fast pseudo-first-order reaction kinetic constant for tetracycline degradation, surpassing single EO systems and binary systems. It also shows long-term stability and universality in degrading refractory contaminants.
Article
Engineering, Chemical
Zexiang Wang, Yufei Han, Weiliu Fan, Yuxia Wang, Lihui Huang
Summary: The new MnO2/carbon@carbon nanotubes (MnO2/C@CNT) shell-core nanohybrid synthesized in this study showed enhanced degradation of tetracycline (TC) with MnO2/C@CNT-PMS systems exhibiting the best TC degradation efficiency at 85.6% in 10 minutes. The stripping and insertion of nanocarbon during synthesis enhanced electron transfer and conversion of Mn and O species, with SO center dot-4 identified as the main active specie during the catalytic reaction. LC-MS analysis was used to propose reasonable degradation pathways of TC.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Wenrui Wei, Kaiheng Guo, Xinwen Kang, Jinsong Zhang, Chuanhao Li, Jingyun Fang
Summary: The UV/permanganate process is a promising innovation for the removal of organic heavy metals from water, utilizing oxidative and adsorptive species to effectively remove organoarsenic compounds. By investigating the removal of roxarsone and p-arsanilic acid, it was found that the cooperation of oxidation and adsorption could lead to significant removal rates of total arsenic in water treatment.
ACS ES&T ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Stanislaw Waclawek, Holger Lutze, Virender K. Sharma, Ruiyang Xiao, Dionysios Dionysiou
Summary: Many aspects of sulfate radical-advanced oxidation processes, particularly under alkaline medium, are widely debated. This review examines the possible mechanisms of activation of peroxydisulfate (PDS) and peroxymonosulfate (PMS) under alkaline conditions based on available literature. The formation of various products (SO52-, HO2-) is discussed, highlighting their complex interactions and potential roles in persulfate activation and radical scavenging. The activation of persulfates in alkaline conditions is highly pH-dependent due to the dissociation centers in both PMS and HO2-. There is a need for more detailed mechanistic studies to address inconsistencies in the current literature. Additionally, the relevance of sulfate radical-based oxidation of hydroxide ions and the importance of hydroxyl radicals differ in chloride-poor and chloride-rich environments.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2022)
Review
Engineering, Environmental
Lihong Wang, Jin Jiang, Jun Ma, Suyan Pang, Tao Zhang
Summary: This review discusses the hot topic of cost-effective oxidation in the remediation of environmental pollutants, focusing on the role of copper species as efficient activators or catalysts and their application potential in polluted water remediation. The review also highlights approaches in literature to improve the performance of Cu(II)-initiated AOPs and methodologies for identifying intrinsic reactive species.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Peizhi Wang, Wei Cheng, Xiaolei Zhang, Qianliang Liu, Ji Li, Jun Ma, Tao Zhang
Summary: The presence of humic acid (HA) in membrane distillation (MD) desalination can mitigate membrane scaling and wetting by forming a compact and protective gypsum/HA scale layer, which blocks the flow channel of scaling ions and suppresses the intrusion of scale particles into membrane pores.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Environmental Sciences
Binghua Jing, Juan Li, Chunyang Nie, Junhui Zhou, Didi Li, Zhimin Ao
Summary: This review systematically summarizes the flow line of DFT calculations for heterogeneous P-AOPs, including the activation and degradation sites, processes, and influential factors. Additionally, it proposes primary evaluation criteria for the activation mechanism of persulfate, aiming to promote the development of P-AOPs.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Wei Cheng, Haodan Xu, Peizhi Wang, Lihong Wang, Anthony Szymczyk, Jean-Philippe Croue, Tao Zhang
Summary: We investigated the modification mechanisms of polyamide reverse osmosis membranes using sulfate radical and hydroxyl radical. The sulfate radical modification improved water permeability and salt rejection rates, while the hydroxyl radical modification enhanced membrane stability. Mass spectrometry analysis revealed that sulfate radical initiated polymerization reactions, while hydroxyl radical degraded the amide groups.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Gabriela Scheibel Cassol, Chii Shang, Juan Li, Li Ling, Xin Yang, Ran Yin
Summary: Adding low-level ferrous iron (Fe(II)) in coagulation can effectively eliminate the chlorite (ClO2-) generated from pre-oxidation and improve radical production and chlorate (ClO3-) reduction in post-UV/chlorine process. The study showed that Fe(II) addition significantly increased the degradation rate of a model micropollutant and reduced the formation of chlorate in the UV/chlorine process.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Engineering, Environmental
Ya Liu, Yunfeng Zhao, Ning Jiang, Wei Cheng, Dongwei Lu, Tao Zhang
Summary: This study reports a CO2-responsive material that can extract emulsified oil and demulsify oil droplets, allowing for separate reclamation of oil and surfactant. The material exhibits a high adsorption capacity for emulsified oil and can switch its surface wettability to achieve the separation of oil and surfactant. High rates of oil removal, oil recovery, and surfactant recovery are maintained during repeated adsorption/desorption operations.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Ying Cao, Juan Li, Yanxin Zhao, Yumeng Zhao, Wei Qiu, Suyan Pang, Jin Jiang
Summary: The degradation of metoprolol by UV/sulfite with and without oxygen was compared. Both processes followed first-order kinetics with comparable reaction rate constants. Both e(aq)- and H· played a crucial role in degradation by UV/sulfite as an ARP, while SO4·- was the dominant oxidant in the AOP. The pH dependence and transformation products were similar between the two processes.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Environmental
Peizhi Wang, Wei Cheng, Xiaolei Zhang, Ji Li, Jun Ma, Tao Zhang
Summary: Membrane distillation (MD) is a promising technology for hypersaline wastewater treatment, but its performance is hindered by inorganic scaling and wetting. This study presents a simple method to engineer membranes that resist scaling and wetting. Results show that coating a PVA layer significantly mitigates scaling and prevents wetting during MD.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Environmental Sciences
Juan Li, Zhong Zhang, Yingying Xiang, Jin Jiang, Ran Yin
Summary: Oxidative treatment of drinking water has a long history and UV-AOPs have emerged as promising technologies for eliminating contaminants. This paper reviews the effects of UV-AOPs on NOM properties and DBP formation in post-disinfection, providing insights for future research and engineering design.
Article
Engineering, Chemical
Wei Cheng, Peizhi Wang, Xiaolei Zhang, Ji Li, Yiwen Luo, Wenjuan Zhang, Jun Ma, Tao Zhang
Summary: This study successfully fabricates Janus membranes with high water flux and anti-scaling/wetting capacities by spray-coating polyvinyl alcohol layers on hydrophobic membrane substrates. The spray-coating method promotes the crosslinking of PVA polymer networks and facilitates water molecule transport, resulting in improved surface properties and wastewater treatment performances compared to traditional methods.
Article
Engineering, Environmental
Tao Yang, Mengyang Zhu, Linqian An, Ge Zeng, Chengqian Fan, Juan Li, Jin Jiang, Jun Ma
Summary: This study reports a method for efficiently decomposing ClO2 by solar light photolysis, which also removes co-present micropollutants. It was found that under simulated solar light, ClO2 can be decomposed to Cl and ClO3 with a yield of up to 65%. Various reactive species, including hydroxyl radical, ozone, chloride radical, and chlorine oxide radical, were generated in the SSL/ClO2 system.
Article
Engineering, Environmental
Lihong Wang, Ning Jiang, Haodan Xu, Yiwen Luo, Tao Zhang
Summary: Cu(II) can catalyze the transition from Cu(II) to Cu(I) to Cu(III) during PDS activation, facilitating the removal of refractory pollutants such as BTH. The coordination of pollutants with Cu(II) plays a crucial role in the oxidative transformation process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Yuhao Zhang, Haorui Wang, Tao Zhang, Zhi Geng, Wei Cheng
Summary: A facile citric acid chelated Fe(II)/PDS modification method was used to generate a controlled-release SO4.- oxidation condition at room temperature, which enhanced the performance of the membrane.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Tao Yang, Linqian An, Ge Zeng, Maoju Jiang, Juan Li, Changyu Liu, Jianbo Jia, Jun Ma
Summary: This study investigates the efficiency and mechanism of Fe(II)/PAA and PAA processes in oxidizing p-ASA and As(III). Fe(II)/PAA process rapidly degrades p-ASA to the toxic As(V) at neutral to acidic pHs, while PAA process is effective in oxidizing As(III). The generation of hydroxyl radicals and organic radicals from PAA contributes to the degradation of p-ASA, and PAA shows potential for the oxidation of As(III).
Review
Environmental Sciences
Da Wang, Ying Xing, Juan Li, Feilong Dong, Haijun Cheng, Zhiqiao He, Lizhang Wang, Stefanos Giannakis, Shuang Song, Jun Ma
Summary: This comprehensive study evaluates the effectiveness, mechanisms, and potential risks of direct ozonation processes and ozone-based AOPs in removing various odor compounds from drinking water sources. It also analyzes the impact of operational parameters on odor compound removal and introduces practical combined drinking water treatment methods incorporating ozone and other processes.