Article
Environmental Sciences
Minhua Su, Zequan Liu, Yanhong Wu, Hairong Peng, Tao Ou, Shuai Huang, Gang Song, Lingjun Kong, Nan Chen, Diyun Chen
Summary: A novel composite material, graphene oxide (GO)/hydroxyapatite (HAP), was synthesized successfully for effective removal and immobilization of hexavalent uranium (U(VI)). The composite exhibited outstanding U(VI) sorption capacity and the phosphate group in the composite played a key role in U(VI) retention and incorporation. This development may lead to the creation of highly efficient materials for treating radioactive wastewater.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Analytical
Dianxin Li, Peng Zhang, Yiqing Yang, Yuqi Huang, Tao Li, Junwei Yang
Summary: Graphene oxide encapsulated in sodium alginate was used to prepare a composite hydrogel for U(VI) adsorption, showing a high adsorption capacity which remained above 85% after multiple desorption and reuse cycles.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Chemistry, Analytical
Renjuan Liu, Hai Wang, Chengtao Yue, Xu Zhang, Meng Wang, Longcheng Liu
Summary: In this study, a novel MoS2-GO composite material was prepared and used for U (VI) adsorption. The results showed that MoS2-GO had a higher specific surface area and exhibited excellent selectivity for U (VI), greatly enhancing its uranium uptake capability.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Chemistry, Physical
Ling Ding, Shuai Zhang, Chaoyou Tao, Jun Liao, Yong Zhang, Lin Zhang
Summary: A novel graphene oxide-supported TixAl1-xOy bimetallic oxide was successfully synthesized for uranium removal. The addition of graphene oxide improved the dispersion of TixAl1-xOy nanoparticles and increased the active sites of the complexes. The adsorption efficiency and capacity of GO@TixAl1-xOy for uranium significantly outperformed other bimetallic oxides, reaching 97.8% and 614.6 mg g-1 at T = 298 K and pH = 4. The adsorption process followed the pseudo-second-order and Langmuir models, indicating a uniform chemisorption mechanism. The excellent adsorption performance was attributed to strong complexation, oxygen vacancy filling, and reduction.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Analytical
Lijiao Fan, Guolin Huang, Shasha Yang, Yiming Xie, Wenbing Liu, Jeffery Shi
Summary: The adsorption properties of phosphate-functionalized biopolymer/graphene oxide gels on U(VI) in aqueous solution were studied, showing good adsorption performance and selectivity. The Langmuir isotherm model and second-order Langergren rate equation were used to analyze the experimental data, demonstrating high U(VI) uptake and rate constants. Compared to other coexisting ions, the gels exhibited remarkably better selective adsorption to U(VI) in real-world uranium-containing wastewater.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Chemistry, Physical
Jun Liu, Shilong Shi, Chao Li, Xu Hong, Zhixing Gu, Fei Li, Juan Zhai, Qingxian Zhang, Jiali Liao, Ning Liu, Chunhai Liu
Summary: The study synthesized CTAB-HAp-Bent composites and tested their U(VI) adsorption performance. The results showed that CTAB-HAp-Bent had excellent adsorption capacity with a maximum qe value of -108.19 mg/g under different pH and ionic strength conditions. Additionally, the study found that phosphate can enhance adsorption at low concentrations, while carbonate suppresses the adsorption of U(VI).
APPLIED CLAY SCIENCE
(2021)
Article
Engineering, Environmental
Shuai Zhou, Yanxing Xie, Feiyu Zhu, Yuanyuan Gao, Yingjiu Liu, Zhenping Tang, Yi Duan
Summary: A novel composite material (PAO/GO/CS) was prepared to address the difficulty of separating GO from water due to its high hydrophobicity and dispersibility. This composite showed improved adsorption performance for U(VI) through cross-linking reaction between GO and chitosan.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Fuxiang Song, Yuxin Niu, Na Wang, Wenjie Chen, Weibo Xie, Bin Liu
Summary: A 3D-printed graphene oxide (GO)/calcium alginate (CA) hybrid network (3D GO/CA) with excellent U(VI) adsorption performance was constructed using direct ink writing-based 3D printing technology and in situ calcium ion cross-linking technology. The 3D GO/CA exhibited a wide valid pH range (3-12) and excellent adsorption capacity for U(VI) in a strongly acidic solution. Furthermore, it showed a high adsorption kinetic reaction rate and stability even after reusing and soaking in strong acid solutions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Wenjun Wu, Jianlong Wang
Summary: Effective treatment of uranium-containing wastewater is crucial for the sustainable development of nuclear power and environmental protection. The synthesized uranium adsorbent in this study showed high efficiency in removing uranium from aqueous solution.
Article
Chemistry, Applied
Mojtaba Safaviyan, Mehdi Faramarzi, Seyed Aboutaleb Mousavi Parsa, Hajir Karimi
Summary: In this study, a novel Cr(VI) adsorbent, TEPA-enriched MGO, was developed and characterized. The optimal parameters for Cr(VI) sorption, including Cr(VI)/MGOT ratio, temperature, and pH, were determined through Box-Behnken Design. The maximum adsorption capacity was found to be 287.15 mg/g. The Lagergren kinetic and Langmuir isotherm models accurately represented the adsorption process on MGOT. Based on the obtained results, MGOT was identified as an excellent reusable adsorbent for selective Cr(VI) sorption and magnetic separation from wastewater.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Chemistry, Physical
Mingzhen Wang, Yanhui Li, Mingfei Cui, Meixiu Li, Wenshuo Xu, Liubo Li, Yaohui Sun, Bing Chen, Kewei Chen, Yang Zhang
Summary: This study investigates the adsorption performance of barium alginate/sodium alginate-graphene oxide membranes and three-dimensional barium alginate-bentonite-graphene oxide derived hydrogels. The results show that barium alginate is a better carrier material than calcium alginate for dye removal.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Taiba Naseem, Fozia Bibi, Saira Arif, Muhammad Waseem, Sirajul Haq, Mohamad Nor Azra, Taavi Liblik, Ivar Zekker
Summary: The study utilized rGO-ZnO for removing Cr (VI) from aqueous medium, which was found to be more economical and promising than GO. The adsorption kinetics followed the pseudo-first-order model, while the equilibrium study showed that the non-linear Langmuir model was a better fit. The calculated maximum adsorption capacities for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively, with endothermic and spontaneous nature of adsorption detected.
Article
Environmental Sciences
Kristina Brix, Sandra Baur, Aaron Haben, Ralf Kautenburger
Summary: This study investigates the retention behavior of U(VI) on non-pre-treated Ca-bentonite as a potential technical barrier in high-level nuclear waste disposal, under extreme geochemical conditions. Batch experiments show that U(VI) can be immobilized from 10% to 100% under various conditions, with Ca(II) enhancing the adsorption onto Ca-bentonite particularly in hyperalkaline pH range. Competing elements like Eu(III) affect the binding sites of U(VI) and facilitate precipitation at higher concentrations.
Article
Engineering, Chemical
Changlong Bi, Chunhong Zhang, Fuqiu Ma, Lien Zhu, Ruiqi Zhu, Qi Qi, Lijia Liu, Hongxing Dong
Summary: A 3D porous Ag+ decorated PCN-222 @ graphene oxide-chitosan foam adsorbent (APGC foam) was designed and synthesized for recovering U(VI) ions from seawater, showing excellent adsorption capacity, selectivity, and reusability. The mechanism of U(VI) adsorption by APGC foam was found to involve coordination, electrostatic interaction, and intraparticle diffusion, making it a promising adsorbent for U(VI) recovery from seawater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Marwa I. M. Ibrahim, Elsayed A. M. Awad, Salah M. M. Dahdouh, Wafaa M. T. El-Etr, Samy A. Marey, Ashraf Atef Hatamleh, Mohsin Mahmood, Ahmed S. Elrys
Summary: The adsorption of graphene oxide (GO) on clay minerals (e.g., bentonite and kaolinite) was tested under different chemical conditions to understand its behavior in soils. The results showed that both bentonite and kaolinite had affinity for GO, but bentonite had superior adsorption due to its higher surface area and charge. Increasing ionic strength and decreasing pH enhanced the adsorption of GO nanoparticles, primarily due to the interaction between clay minerals and GO nanoparticles' surface oxygen functional groups. These findings contribute to a better understanding of GO behavior in soils and its potential impact on groundwater.
