Article
Chemistry, Physical
Nurhaswani Alias, Navid Mirzakhani, Mustaffa Ali Azhar Taib, Syafinaz Ridzuan, Wai Kian Tan, Go Kawamura, Atsunori Matsuda, Zainovia Lockman
Summary: Free-standing anodic TiO2 films consisting of vertically oriented nanotubes can be produced by anodizing titanium in ethylene glycol with the addition of Na2CO3. Annealing in different atmospheres and temperatures can affect the crystallinity and photocatalytic activity of the TiO2 films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Nurulhuda Bashirom, Wai Kian Tan, Go Kawamura, Atsunori Matsuda, Zainovia Lockman
Summary: In this work, anodic self-aligned oxide nanotube arrays were produced by anodic oxidation of Ti-40 wt.% Zr alloy in EG/NH4F/H2O electrolyte. The ZrTiO4-TiO2 nanotubes exhibited higher photocatalytic activity for reducing Cr(VI) ions compared to ZrO2-TiO2 nanotubes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Mingxia Zhao, Zhiju Zhao, Zheng Wang, Junbing Jiang, Ling Yu, Liqin Yang, Hao Guo, Zhenyu Cai
Summary: ZnIn2S4/TiO2 photocatalyst prepared by hydrothermal method showed excellent reduction performance and stability under visible light, with a reduction rate of Cr (VI) reaching 99% in 60 minutes and maintaining performance after 5 recycling experiments.
CERAMICS INTERNATIONAL
(2021)
Article
Environmental Sciences
Nurhaswani Alias, Zuhailawati Hussain, Wai Kian Tan, Go Kawamura, Hiroyuki Muto, Atsunori Matsuda, Zainovia Lockman
Summary: In this study, the optimum conditions for producing circular, ordered, and uniform nanoporous anodic film were investigated by studying the effect of anodization voltage and electrolyte temperature. Increasing the applied voltage resulted in larger pore diameter. The as-anodized film consisted of nanocrystallites that transformed into orthorhombic Nb2O5 after annealing. Interestingly, the as-anodized Nb2O5 exhibited better photoreduction of Cr(VI) compared to annealed Nb2O5, though the annealed Nb2O5 showed higher photocatalytic efficiency and stability.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Xinjiao Dong, Yaru Li, Rui Zhu, Chuanhua Wang, Shimei Ge
Summary: The Z6 strain is a new bacterial strain capable of simultaneously removing both hexavalent chromium and pyrene through chromium reduction and pyrene biodegradation mechanisms. Additionally, the carrier loofa used for bacteria immobilization did not significantly affect the removal process and could be reused multiple times without loss of effectiveness.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Rokhsareh Akbarzadeh, Negin Farhadian, Anvar Asadi, Tahereh Hasani, Setaya Salehi Morovat
Summary: A facile method to produce black TiO2 with improved light absorption in the visible and infrared regions was developed in this study. The synthesized Bi-V co-doped black TiO2 showed high photocatalytic activity in reducing Cr(VI) under visible light irradiation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Veer Singh, Jyoti Singh, Vishal Mishra
Summary: In this study, chitosan coated MnO2 nanoparticles synthesized through a green route using curcumin and Citrus limetta peel extract were successfully used to biosorb and reduce Cr(VI) to less toxic Cr(III). The nanoparticles showed spherical shape, crystalline nature, and a size range of 14 to 24 nm. They exhibited high specific surface area, active binding sites for chromium ions, and were proven to be reusable over multiple cycles of adsorption-desorption. The results suggest that these nanoparticles have great potential for water treatment applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yu-Xuan Li, Chong-Chen Wang, Huifen Fu, Peng Wang
Summary: The TiO2/MIL-125 core-shell composites were successfully prepared and exhibited superior photocatalytic performance, with the optimal MT-2 showing excellent activity in Cr(VI) reduction. Additionally, the formation of TiO2 nanosheets improved the separation efficiency of photo-induced carriers.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Nguyen Thi Khanh Van, Nguyen Nang Dinh, Nguyen Thanh Trung, Nguyen Nhat Huy, Nguyen Thi Thuy, Dang Van Thanh, Vu Thi Thuy, Pham Huong Quynh, Pham Van Hao
Summary: A highly efficient sonoelectrochemical technique for synthesizing TiO2 nanoparticles at a mild temperature of 60 degrees C under an atmosphere environment is proposed in this study. The synthesized nanoparticles have an anatase crystalline phase with a particle size of about 6.5 nm and a superior surface area of 202.85 m2/g, exhibiting good photocatalytic reduction of Cr(VI) under UVA irradiation in aqueous solution.
Article
Polymer Science
Wen-bo Tan, Dan Luo, Wei Song, Yan-yan Lu, Nuo Cheng, Jia-bin Zhang, Ting Huang, Yong Wang
Summary: In this study, a novel adsorbent based on cellulose acetate was developed with excellent adsorption and reduction abilities for highly hazardous Cr(VI) removal from wastewater.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Environmental Sciences
Ting Jiang, Jian Chai, Yingying Wang, Qiong Du, Jing Shi, Zhengwen Xu
Summary: A novel nanocomposite material, Fe-0/TiO2@D201, was synthesized to enhance the removal of Cr(VI) from water. The nanocomposite showed outstanding removal efficiency and stability, making it a promising candidate for practical applications.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Munchan Kang, Sung Ho Yu, Kyung-Youl Baek, Myung Mo Sung, Sangho Cho
Summary: In this study, MIL-101-NH2(Fe) was immobilized on a polymeric microfiber mesh to improve reusability and minimize the loss of catalytic performance. The introduction of an Al2O3 layer and NH2BDC linker facilitated uniform coating of the MOF on the fiber surface. The resulting fiber-immobilized MOFs demonstrated high photocatalytic performance in the removal of organic dyes and heavy metals, retaining over 85% efficiency after five cycles.
Article
Chemistry, Multidisciplinary
Yu Song, Xi Lu, Zhibao Liu, Wenfei Liu, Ligang Gai, Xiang Gao, Hongfang Ma
Summary: The low-toxicity treatment of chromium-containing wastewater is an important solution to environmental problems. A core-shell structural ZIF-8@TiO2 photocatalyst was synthesized and showed improved photocatalytic activity compared to TiO2. The optimized ZIF-8@TiO2 composite exhibited the highest removal efficiency of Cr(VI) with 93.1% after 120 min of UV-vis irradiation. The superior removal efficiency is attributed to the high adsorption of ZIF-8 and the high separation efficiency of photo-induced electron-hole pairs.
Article
Engineering, Environmental
Xiaohui Ji, Xiaohua Guo, Xuegang Luo, Jianqi Ma
Summary: Monodispersed anatase TiO2 microspheres were prepared by modifying the sol-gel method. In2S3 nanoparticles (NPs) were loaded onto the TiO2 to form non-core-shell TiO2/In2S3 and core-shell TiO2@In2S3 composites. The photocatalytic activity of these composites for HCOONH4-mediated photoreduction of Cr(VI) was studied. Results showed that TiO2@In2S3 exhibited higher photocatalytic activity than TiO2/In2S3 due to more efficient interfacial electron transfer between In2S3 and TiO2.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Hai Liu, Guipeng Tian, Wenyi Wang, Jiachunxiu Zhang, Tianshu Wu, Xinye Ni, Yin-Hu Wu
Summary: The reduction of Cr(VI) to Cr(III) and subsequent precipitation, using a flow-through electrode system (FES), simplifies the treatment processes and offers potential for recollecting Cr resources. The study demonstrates that a multi-cathode FES system can significantly enhance Cr(VI) reduction and Cr(III) precipitation efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)