Article
Engineering, Environmental
Wajahat Abbas, Shujaat Abbas, Mohsin Nawaz, Mudassar Azam, Jae-Min Oh, Asif Shahzad
Summary: The study synthesized PC-PSPANBs to control persulfate release for targeted PAHs' degradation, showing significantly slower release rate with polystyrene coating. The Fe(II)-activated PC-PSPANBs achieved high removal efficiencies and degradation rate constants for ACE, 2-MN, and DBF, while the presence of anions SO42- and Cl- enhanced the degradation. The effectiveness of PS release longevity was demonstrated with sustained degradation of ACE and DBF even after repeated spiking.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Xu Zhu, Weiwu Hu, Chuanping Feng, Nan Chen, Hongyan Chen, Peijing Kuang, Yang Deng, Linlin Ma
Summary: The electrocatalytic properties of Ti/RuO2-SnO2 and Ti/RuO2-IrO2 anodes in different electrolytes were studied for aniline degradation. Ti/RuO2-SnO2 showed higher activity in Na2SO4 electrolyte, while Ti/RuO2-IrO2 was more effective in NaCl electrolyte. The presence of Fe2+ can decrease TOC removal efficiency, especially for Ti/RuO2-SnO2.
Article
Engineering, Environmental
Xi Zheng, Tianyuan Xu, Xueyan Kang, Yaowen Xing, Yijun Cao, Xiahui Gui
Summary: This study systematically investigated the activation performance of coke powder (CP) towards persulfate (PS) and discussed its mechanism for organic pollutant degradation. The results show that CP has highly disordered amorphous structures with abundant oxygenated functional groups (OFGs) and persistent free radicals (PRFs), which contribute to the excellent activity of CP for PS activation. The study also reveals that superoxide anion radical (O-2•) is responsible for the degradation of organic pollutants in the CP/PS system, and its generation is independent of dissolved oxygen. These findings provide important insights for the development of remediation materials using by-products of the coking process for wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Bojiao Yan, Huan Deng, Hongyan Wei, Lizhu Chen, Hongxu Liu, Tiehong Song, Xiaodan Yu
Summary: The study investigates the degradation of bisphenol A (BPA) using powdered iron and ferrous sulfate as activators for persulfate activation. The results show that Fe(II)/PS and Fe(0)/PS systems can efficiently degrade BPA under specific conditions.
Article
Engineering, Chemical
Jingwen Hu, Shuang Zhou, Su Liao, Guohua Gu, Yanhong Wang
Summary: In this study, oxidized pyrite was used to degrade the toxic collector aniline aerofloat (DDA) by activating persulfate. The oxidized pyrite was found to be more effective than fresh pyrite in removing DDA from a persulfate system at various pH levels. The study investigated the factors affecting DDA degradation in the pyrite-persulfate system and proposed a potential DDA degradation pathway. These findings provide a template for using oxidized pyrite to remove DDA from wastewater in mineral processing plants.
MINERALS ENGINEERING
(2023)
Article
Environmental Sciences
Fengcheng Jiang, Yilian Li, Wei Zhou, Sen Yang, Zhe Yang, Yu Ning, Danqing Liu, Yuan Zhang, Baoguo Yang, Zhi Tang
Summary: The oxidation process of monochlorobenzene (MCB) is influenced by the presence of anions, cations, and natural organic matter in groundwater. Cysteine (Cys) enhances the removal of MCB, while certain anions and cations can inhibit the degradation of MCB.
Article
Engineering, Chemical
D. Syam Babu, P. Nidheesh
Summary: Arsenic pollution in groundwater is a global issue, with traditional methods struggling to completely eliminate arsenite. Oxidizing arsenite to arsenate is necessary for complete removal of arsenic. Persulfate-mediated advanced oxidation processes are effective in removing arsenite, with iron anode mediation showing better results.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Can Chen, Hongming Wu, Dengfeng Zhou, Dinghong Xu, Ying Zhou, Jianbing Guo
Summary: The research shows that lithium-rich cathode materials Li1.2Mn0.54Ni0.13Co0.13O2 (LMNCO), prepared by the sol-gel method with DL lactic acid as the chelating agent, demonstrate excellent crystal structure and electrochemical performance. Among LMNCO-5.5, LMNCO-7.0, and LMNCO-8.5, LMNCO-7.0 exhibits smaller particle sizes and better electrochemical properties. The first discharge capacity of LMNCO-7.0 is 232.31 mAh g(-1), decreasing to 194.93 mAh g(-1) after 50 cycles.
CERAMICS INTERNATIONAL
(2021)
Article
Construction & Building Technology
Ruiyang Wang, Jianying Yu, Quantao Liu, Dongliang Kuang, Heping Qiu
Summary: Ion chelating agent (ICA) can enhance the self-repairing of cracks and pores in concrete, and the addition of permeable crystallization surface treatment agent (magnesium fluorosilicate) can further improve this self-repairing capability. The study showed that the compressive strength recovery rate of mortar containing ICA and 0.50 wt% magnesium fluorosilicate was 24.4% higher than that of the control mortar after pre-loading 70% of the failure strength. At 28 days, the ratio of harmful pores of mortar with ICA and 0.25 wt% magnesium fluorosilicate decreased by 62.6% compared with the control mortar. Moreover, a crack with a maximum width of 0.60 mm in mortar incorporating ICA and 0.5 wt% magnesium fluorosilicate could be completely repaired within 28 days.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Zhiming Yan, Yong Gu, Xing Wang, Yueli Hu, Xia Li
Summary: This study investigated the removal rate and mechanism of aniline by sulfate radical-based advanced oxidation processes under different influencing factors. Results showed that factors such as persulfate and ferrous ions dosage, solution pH, and the presence of Cl-, HCO3-, and NO3- all influenced the aniline degradation process. The study provides valuable insights for developing processes for aniline degradation in wastewater treatment.
Article
Chemistry, Physical
George Z. Kyzas, Nezamaddin Mengelizadeh, Morteza Khodadadi Saloot, Samaneh Mohebi, Davoud Balarak
Summary: This paper evaluates the use and efficiency of various oxidation methods in the removal of ciprofloxacin. The US/PS/H2O2/Fe2+ process was found to be the most efficient, achieving 100% removal of CIP at specific conditions. Increasing ultrasonic power and concentrations of H2O2, PS, and Fe2+ resulted in higher removal percentages. The toxicity of the CIP solution was completely eliminated by the US/PS/H2O2/Fe2+ process. The process also showed higher reaction rate constants and lower energy consumption compared to other systems. The combined processes with iron were effective in converting non-biodegradable wastewater into a biodegradable form.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Environmental
Peishan Li, Hui Ma, Sijia Qian, Yi Chen, Bo Lai, Shengyan Pu
Summary: In this study, nFeS was modified with sodium carboxymethyl cellulose (CMC) to improve its stability and catalytic reactivity. The CMC-nFeS activator showed a higher reaction rate constant and better removal efficiency of p-nitrophenol compared to pure nFeS.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Medicinal
Momin Khan, Muhammad Raheel, Sana Shah, Mohammad Ibrahim, Muhammad Asif, Uzma Salar, Khalid Mohammed Khan
Summary: The aim of this study was to synthesize bioactive compounds with antioxidant potential. Fourteen isophthalate Schiff base derivatives were synthesized and screened for their antioxidant activities using DPPH, ferrous ion chelating, and ferric reducing assays. Most of the synthetic compounds showed significant antioxidant activities. These moderately active compounds can be further modified to identify more powerful antioxidant agents.
LETTERS IN DRUG DESIGN & DISCOVERY
(2023)
Article
Engineering, Environmental
Hailan Yang, Rongliang Qiu, Yetao Tang, Shujing Ye, Shaohua Wu, Fanzhi Qin, Ling Xiang, Xiaofei Tan, Guangming Zeng, Ming Yan
Summary: Residual flotation reagents in mineral processing wastewater can pose severe ecological threats when discharged untreated. Metal-free biochar-induced persulfate-advanced oxidation processes (KCBC/PS) efficiently degrade aniline aerofloat (AAF) at low doses of catalyst and oxidant. The dominant reactive oxygen species in the KCBC/PS system is O-2(center dot-), which achieves deep mineralization of AAF. The electron transfer mechanism and active sites play important roles in the KCBC/PS system, allowing for wide pH adaptation and resistance to inorganic anions in real mining wastewater treatment. Carbonyl group is the active site for the non-radical pathway of biochar, while the conversion of SO4 center dot- to superoxide radicals represents a defect. The study also reveals a possible degradation pathway of AAF and its reduced environmental toxicity.
Article
Chemistry, Multidisciplinary
Chao Ma, Xin Liu, Cheng Wang, Shengtian Gao, Xiaoyi Huang
Summary: Diethylenetriaminepentaacetic acid (DTPA) and its complex, penta sodium diethylenetriamine-pentaacetate (DTPA-5Na), have been identified as effective chelating agents for the removal of dense and hard barium sulfate (BaSO4) scale. The study investigated the synthesis of DTPA-5Na and its chelation effectiveness, as well as the mechanism of action using microstructural scanning electron microscopy and molecular dynamics simulation.
