Article
Polymer Science
Ambreen Ashar, Ijaz Ahmad Bhatti, Asim Jilani, Muhammad Mohsin, Sadia Rasul, Javed Iqbal, Muhammad Bilal Shakoor, Abdullah G. Al-Sehemi, S. Wageh, Ahmed A. Al-Ghamdi
Summary: The study focused on the solar photocatalytic reduction of highly toxic Cr(VI) to innocuous Cr(III) using the efficient and economically feasible ZnO/CuO nanocomposite grafted onto polyester fabric. Characterization techniques confirmed the successful grafting of solar active nanoflakes onto the fabric and the enhanced reduction of Cr(VI) metal from wastewater. The ZnO/CuO/PF demonstrated reusability and remarkable effectiveness in removing chromium from wastewater under natural sunlight.
Article
Chemistry, Multidisciplinary
Ambreen Ashar, Ijaz Ahmad Bhatti, Muhammad Mohsin, Maryam Yousaf, Humera Aziz, Adeeba Gul, Tausif Hussain, Zeeshan Ahmad Bhutta
Summary: The study demonstrates that iodine-doped ZnO/GB can effectively degrade hexavalent chromium in tannery effluent, exhibiting high photocatalytic activity and thermal stability. Furthermore, the environmental friendliness of this method under sunlight irradiation is also confirmed.
FRONTIERS IN CHEMISTRY
(2022)
Article
Engineering, Environmental
Xing Chen, Xu-Xu Ke, Yao Liu, Rohan Weerasooriya, Heng Li, Yu-Cheng Wu
Summary: Chromium undergoes redox speciation easily, with the Cr(VI) oxidation state being common and mobile in the environment. A new method using Au/mpg-C3N4 nanocomposites was developed for accurate detection of Cr(VI), with excellent sensitivity and detection limit. The nanocomposites consist of well-dispersed gold nanoparticles with an average diameter of 50 nm decorating the surface of mpg-C3N4.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Valeriia Poliukhova, Misun Kang, A-Ra Hong, Kwang Rok Mun, Daiha Shin, Kyoung-Won Park, Ho Seong Jang, So-Hye Cho
Summary: The combination of ZnO/ZnS nanoparticles with NaYF4:Yb3+,Tm3+ upconversion nanoparticles in a core-shell composite structure enables the utilization of sunlight energy in photocatalysis. Advanced characterization techniques and computational methods were used to understand the interface and conditions for energy transfer between upconversion nanoparticles and ZnO. The in situ formation of a heterojunction on ZnO attached to upconversion nanoparticles was also demonstrated to enhance NIR-driven photocatalytic activity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Li Zhang, Chitiphon Chuaicham, Vellaichamy Balakumar, Keiko Sasaki
Summary: This study investigates the photocatalytic activity of Fe(III)-doped montmorillonite (Mt) for the remediation of hexavalent chromium (Cr(VI)). Fe(III) doping enhances the photocatalytic activity of Mt, and the transformation of Cr(VI) to Cr(III) is mainly facilitated by Fe(III) doping on the interlayer and aluminosilicate layers of Mt. Higher Fe(III) doping leads to higher photocatalytic efficiency, but excessive Fe(III) reduces the efficiency due to electron trapping and overlapping with active sites. The mechanism of the photocatalytic property of Fe(III)-doped Mt is revealed for the first time, which involves the formation of a new Fermi level and narrowing of the band gap of Mt.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Environmental Sciences
Sheng Sheng, Siyuan Song, Bin Hu, Jingjing Fu, Chongchong Liu, Weixiang Tao
Summary: Removal of high toxic Cr(VI) with solar energy is important for water pollution improvement, but developing photocatalysts with high conversion efficiency and low cost is challenging. This study focuses on interfacial hybridization by bonding layered black phosphorus (BP) sheets with ZnO surfaces, which enhances light absorption and carrier separation efficiency. The Cr reduction performance is improved about 7.1 times by this interfacial atom hybridization approach.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Lu Zhang, Jianhao Qiu, Dingliang Dai, Yichen Zhou, Xi Liu, Jianfeng Yao
Summary: MIL-101(Cr)@ZnIn2S4 hierarchical heterojunction was fabricated through in-situ growth of ZnIn2S4 on MIL-101 and electrostatic self-assembly. The hierarchical structure provides a high-speed channel for charge transfer, inhibiting the recombination of charge carriers and promoting remarkable photocatalytic activity.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Environmental Sciences
Eric Tobechukwu Anthony, Nurudeen Abiola Oladoja
Summary: This discourse provides insight into strategies for enhancing the photoreduction of Cr(VI) to Cr(III), emphasizing the importance of experimental findings for process optimization.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Water Resources
Jemal Fito, Mikiyas Abewaa, Thabo Nkambule
Summary: Parthenium hysterophorus-based biochar-Fe3O4 composites were synthesized to remove Cr(VI) from tannery wastewater. The adsorption process was optimized using response surface methodology, and the results showed that the composite had a high removal efficiency.
APPLIED WATER SCIENCE
(2023)
Article
Environmental Sciences
Mohanapriya Velumani, Jeyanthi Jeyadharmarajan
Summary: This study investigates the reduction of Cr (VI) pollutant from tannery effluents using TiO2, SB/TiO2, and c-SB/TiO2 nano photocatalysts. The results show that the c-SB/TiO2 photocatalyst exhibits enhanced photocatalytic activity and pollutant removal under UV light irradiation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Nurudeen Abiola Oladoja, Joseph Adebusola Ogunniyi, Eric TobechukwuAnthony, Sumit Kumar, Stephan Hofmann
Summary: In decentralized systems, adsorption-based strategies have advantages for treating drinking water contaminated with oxoanion. However, these strategies do not involve transformation to an innocuous state. After-treatment procedures to manage the hazardous adsorbent further complicate the process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Zhiyan Yan, Chenrui Liu, Yun Liu, Xiaoqian Tan, Xinyue Li, Yan Shi, Chunlian Ding
Summary: This study investigated the interaction of ZnO nanoparticles, Cr(VI), and Pannonibacter phragmitetus BB, and found that ZnO NPs inhibited Cr(VI) reduction but had no effect on bacterial viability. Cr(VI) induced BB to produce organic acids and release Zn2+ from ZnO NPs. The dissolved Zn2+ promoted Cr(VI) reduction, but hindered Cr(V)/Cr(IV) transformation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Qian Zhao, Xiao-Hong Yi, Chong-Chen Wang, Peng Wang, Weiwei Zheng
Summary: The MA photocatalyst prepared via hydrothermal immobilization method can achieve efficient Cr(VI) reduction under white light, showing potential for continuous operation in fixed-bed reactors.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Bo Zhang, Jun Li, Ying-Shuo Wang, Hui-Meng Zhao, Jia-Hui Yu, Meng-Zhen Liu
Summary: This study demonstrates that Cu2I2-bipy is a suitable material for photocatalytic reduction of highly toxic Cr(VI), with advantages such as low cost, easy preparation, good stability, and appropriate band gap. Further experiments show that Cu2I2-bipy is highly efficient for Cr(VI) reduction with rapid kinetics, high conversion rate, and excellent cycling stability, which may be attributed to the separation of valence bands and conduction bands in the material.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Meng Wu, Xu Zhang, Jianhua Yang, Bo Chen, Jianjun Lian, Ruyi Wang, Yong Jia
Summary: In this study, ZnO/ZnIn2S4 photocatalysts with different mass ratios were synthesized for efficient Cr(VI) removal. The presence of well-distributed ZnO nanoparticles on the surface of ZnIn2S4, forming a unique flower-like structure, was confirmed. The high removal efficiency of Cr(VI) was attributed to the Z-scheme heterojunction formed between ZnO and ZnIn2S4, which enhanced visible-light absorption and charges separation efficiency. The potential of ZnO/ZnIn2S4 Z-scheme heterojunction as an efficient photocatalyst for wastewater treatment under visible light irradiation was highlighted.
MOLECULAR CATALYSIS
(2023)