Article
Engineering, Environmental
Tingting Zhu, Bin Liu
Summary: In this study, peracetic acid (PAA), ultraviolet (UV)/PAA, and ultrasonic (US)/PAA pre-oxidation were used to improve the ultrafiltration (UF) performance for algae-laden water treatment. The results showed that PAA at a dosage of 10 mg/L achieved the best performance with a 76.26% reduction in membrane fouling resistance. Low dosage of UV/PAA effectively controlled fouling by enhancing the degradation of dissolved organics. The study also revealed that moderate oxidation, with high organic degradation and low cell rupture, was the key principle for algae-laden water treatment.
Article
Environmental Sciences
Yong Liu, Yang Zhao, Jianlong Wang
Summary: In this study, a novel Cu-0-Cu2O@CNTs composite was synthesized and applied to activate PDS for the degradation of 2,4-DCP in contaminated lake water, showing high efficiency and selectivity. The composite overcomes the limitations of using Cu-0 and Cu2O alone, and can effectively degrade 2,4-DCP with high efficiency and selectivity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Qicheng Qiao, Seema Singh, Shang-Lien Lo, Jierong Jin, Yong Chang Yu, Lizhang Wang
Summary: The present study aimed to enhance the degradation and mineralization of 4-chlorophenol during electrochemical oxidation, investigating the effects of operating parameters and the formation of chlorine-related species. The degradation of 4-CP mainly depends on the radicals and active chlorine formation, as observed in the study. The research provides insights into the technical feasibility of the process and the mechanisms involved in the degradation and mineralization of 4-CP.
Article
Engineering, Environmental
Xiuwei Ao, Xi Zhang, Shiyu Li, Yiting Yang, Wenjun Sun, Zifu Li
Summary: The Medium-Pressure Ultraviolet/Peracetic Acid (MPUV/PAA) process was used to degrade fluoroquinolones (FQs) in water, and it significantly promoted FQs degradation due to the contribution of reactive radicals. The MPUV/PAA process achieved rapid degradation of FQs within a wide range of pH values (5-9) by selecting levofloxacin (LEV) as the target compound.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Biotechnology & Applied Microbiology
Ganesh Swain, R. K. Sonwani, R. S. Singh, Ravi P. Jaiswal, B. N. Rai
Summary: In this study, Bacillus flexus GS1 IIT (BHU) as free and immobilized cells were used for the removal of 4-Chlorophenol from synthetic wastewater. The maximum removal efficiencies were 90.34% for immobilized cells and 78.12% for free cells, showing promising results for the treatment of pollutants in wastewater. Additionally, a packed bed bioreactor operation achieved a maximum removal efficiency of 82.4% and elimination capacity of 29.6 mg/L/d, indicating good performance in continuous treatment processes.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Environmental Sciences
Yang Li, Ying Ma, Zisheng Zhao, Xin Wen, Guangkuo Xu, Lin Jiang, Lifen Liu, Yaobin Zhang, Zhiqiang Zhao
Summary: A strategy utilizing magnetite and endogenous electron donors for self-dechlorination of 4-CP was proposed and significantly improved the removal efficiency of 4-CP in biotic groups with magnetite. LC-MS and GC analysis revealed the possible metabolic pathway of 4-CP degradation with magnetite, while high-throughput sequencing showed an increase in beneficial bacterial species in magnetite-supplemented biotic groups.
Article
Engineering, Chemical
Yen-Hui Lin
Summary: In this study, the degradation of 4-CP using acclimated sludge was evaluated through batch experiments. The Haldane kinetics showed a better fit to the experimental results than the Monod kinetics. The kinetic parameters obtained from the batch experiments were used as input parameters for the kinetic model system of the packed bed reactor (PBR), which was validated through continuous flow PBR experiments. The approaches presented in this study can be applied to design a PBR for 4-CP treatment in wastewater from various industries.
Article
Biotechnology & Applied Microbiology
Ali Assadi, Roya Alimoradzadeh, Hossein Movahedyan, Mohammad Mehdi Amin
Summary: This study investigated the microbial and biodegradation kinetics of acclimated-mixed sludge to 4-chlorophenol in an aerobic sequencing batch reactor. The biodegradation kinetics were predicted accurately using the Haldane formulae. However, pure strains isolated from mixed sludge did not show higher 4-CP-removal efficiency due to the presence of an intermediate meta-cleavage product.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Environmental
Saravanan Rajendran, Rekha Pachaiappan, Tuan K. A. Hoang, Sekar Karthikeyan, Lalitha Gnanasekaran, S. Vadivel, Matias Soto-Moscoso, M. A. Gracia-Pinilla
Summary: Recent interest and responsibility in protecting water resources have led scientists to develop mechanisms using sustainable resources like sunlight to remove pollutants from water. Utilizing unique materials and studying semiconductor structures are key in achieving photocatalytic degradation of water pollutants under visible light excitation.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Yu Gao, Da He, Ling Wu, Zhipeng Wang, Yucen Yao, Zheng-Hong Huang, Hao Yang, Ming-Xi Wang
Summary: The nitrogen-doped carbon nanofibers obtained from bacterial cellulose through ammonia treatment exhibited excellent adsorption performance for the removal of organic pollutants from aqueous solutions, with enhanced adsorption capacity, short equilibrium time, and a wide pH range. Their superior adsorption capabilities were attributed to their nanoarchitectures with exposed pores, nitrogen functionalities, and hydrophobic surface.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Polymer Science
Sabina Botti, Francesca Bonfigli, Rosaria D'Amato, Jasmine Rodesi, Maria Gabriella Santonicola
Summary: There is a debate on proper sun exposure to reduce the risk of skin cancer. Customized guidelines are needed as general guidelines are not effective for all skin types. This study presents the use of nanocomposite hydrogel materials as colorimetric sensors for UV exposure. The sensors can be customized to different skin types by adjusting the ratio of titanium dioxide to dye. Future work will focus on improving sensor wearability and expanding the response range.
Article
Chemistry, Inorganic & Nuclear
Zandile Mhlwatika, Ndzondelelo Bingwa
Summary: In this study, the catalytic activity of ABO(3) perovskites synthesized by nanocasting technique was investigated. The physical and chemical characteristics of the perovskites were determined, and it was found that SnAlO3 exhibited the highest catalytic activity in the reduction of 4-nitrophenol. The study also suggested that the reduction of 4-nitrophenol follows a surface-driven electron transfer mechanism.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Tianxin Zhu, Jing Deng, Shijun Zhu, Anhong Cai, Cheng Ye, Xiao Ling, Hongguang Guo, Qiongfang Wang, Xueyan Li
Summary: The study found that UV/chlorine treatment can effectively degrade VEN, with the addition of chlorine and increase in solution pH facilitating VEN removal. HCO3-, Cl-, and HA were found to inhibit VEN degradation during UV/chlorine treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Han Lin, Wenqi Guan, Yibo Xiao, Yujiao Qu, Yuan Ren
Summary: This study investigates the effects of polymerized ferric sulfate (PFS), fulvic acid (FA), and extracellular microalgal metabolites (EMA) on stimulating 2-chlorophenol (2-CP) degradation by Acinetobacter sp. strain ZY1 and elucidates the underlying mechanisms. The addition of these biostimulants increased 2-CP degradation efficiency and restored ZY1 morphology under 2-CP stress. Transcriptomic analysis showed upregulation of genes related to membrane composition, transmembrane transport, metabolism, and cell proliferation, leading to enhanced 2-CP degradation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Xiaowu Dan, Zhiyong Luo, Mei Dai, Meng Zhang, Xiao Yue, Shili Xie
Summary: The study demonstrates that Fe(VI) can efficiently remove 4-CP in water treatment, with optimal degradation occurring at pH 9.20 and complete degradation of 4-CP achieved at a 5:1 mole ratio. The reaction rate of Fe(VI) with 4-CP is pH-dependent, with the rate-determining step being the reaction between deprotonated Fe(VI) and deprotonated 4-CP.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
