BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
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2020
·Vol. 106
·期 1
·165-174
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IF 1.657
Feng Jinghua,Cai Yawen,Wang Xiangxue,Wang Xin,Zhu Mingyu,Fang Ming,Liu Zehua,Tan Xiaoli
Adsorbents with the combination of magnetic separation and removal performance are expected for reducing the adverse impact of nuclear pollution. In this study, the core–shell Fe 3 O 4 @polydopamine (Fe 3 O 4 @PDA) was successfully synthesized and used for removal of uranium (U(VI)) ion from aqueous solution. The abundant N-containing groups derived from PDA exist as the chelate sites for U(VI) and contribute greatly for U(VI) removal. Experimental results show that Fe 3 O 4 @PDA (56.39 mg g –1 ) exhibits greater sorption capacity for U(VI) removal compared with the pure Fe 3 O 4 (9.17 mg g –1 ). The sorption isotherm can be well fitted with Freundlich model and the sorption process is endothermic and spontaneous. The removal of U(VI) can be explained by the complexation of U(VI) with –NH–, –NH 2 and C–O in the surface of Fe 3 O 4 @PDA by X-ray photoelectron spectroscopy (XPS) analysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Ning Pan,Fei Zhou,Xiaoqin Nie,Chunyan Ma,Yu Lei,Hao Lei,Long Li
Water contamination by radioactive iodide raises public concerns due to potential threats to human health and ecosystems. In this study, we synthesized Ag/RGO-4, anchoring nanosilver (Ag) onto reduced graphene oxide (RGO), and verified its efficacy for selective iodide removal. The structure, surface morphology, and functional group composition of the composite material were thoroughly characterized. Iodide adsorption properties, encompassing pH effect, kinetics, equilibrium isotherm, anions’ influence, and column test, were systematically evaluated. Batch tests revealed that RGO addition increased silver’s iodide adsorption capacity from 0.87 to 2.06 mmol g–1 at neutral pH. pH variations had minimal impact, as Ag/RGO-4 relied on AgI precipitate formation. The maximum adsorption capacity was 2.9 mmol g–1. Ag/RGO-4 selectively removed iodide in the presence of interfering anions (CO32–, SO42–, NO3–, Cl–) at 266 mmol L–1, with minimal iodide removal enhancement. After batch test analysis and using comprehensive analytical techniques (XRD, SEM, TEM, FTIR, and XPS), a plausible adsorption mechanism emerged. Hypothesized is the initial oxidation of Ag by C=O groups on RGO in Ag/RGO-4, producing Ag+, leading to iodide sequestration as AgI. The material holds promise for treating iodide-contaminated water from nuclear incidents and nuclear medicine.
研究领域:
环境科学
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材料科学
·
放射医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ruijuan Wang,Cuicui Li,Wei Tian,Hao Liang,Nana Wang,Hongping Zhang,Fupeng Jin,Ruibin Guo,Zunli Mo,Nijuan Liu
In order to ensure the sustainable development of nuclear energy in the future and reduce the damage of nuclear-contaminated water to the ecological environment and organisms, it is of great significance to extract and remove uranium from the environment. In this work, phosphorylated functionalized MXene (TBP-M-OH(e)) was synthesized using a sacrificial template method. Due to the removal of the template, it exhibited a higher surface phosphoryl grafting rate, a looser structure, and a faster adsorption rate compared with TBP-M-OH. The uranium adsorption capacity measured at 298 K, pH=6, C 0 =100 mg·g −1 , m: V=0.5 g·L −1 was 885.00 mg·g −1 along with high selectivity, exceeding most of the reported adsorbents. Even after five cycles of experiments, the uranium adsorption capacity remains satisfactory. The adsorption mechanism of TBP-M-OH(e) was described by FTIR and XPS. The high adsorption performance was attributed to the strong affinity of the phosphonyl group for uranium, as well as the synergistic effect of the amine group in APTES and the functional group of MXene itself for uranium. In conclusion, TBP-M-OH(e) showed an excellent potential for the treatment of nuclear contaminated water.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Maoling Pan,Jiakang Liu,Han Yang,Wanqi Zhang,Kun Huang
The rapid development of the nuclear industry has caused the accidental leakage of radioactive heavy metals, such as uranium, resulting in severe contamination of land and water sources. This paper proposes an effective and feasible program to treat uranium-contaminated wastewater. Nitrogen-doped porous carbon supported nanoscale zero-valent iron (nZVI) composites (Fe 0 @N-PCM-H 2 O 2 ) were synthesized via a combination of in situ pyrolysis and a mild H 2 O 2 post-treatment by using hyper-crosslinked porous polymer as precursor. The obtained Fe 0 @N-PCM-H 2 O 2 exhibited exceptional adsorption capability for uranyl ions (847.5 mg·g −1 ) with minimal iron leaching in aqueous solutions. Especially, H 2 O 2 post-treatment can dramatically improve the adsorption capacity and recoverable properties of the adsorbent. The successful design of this material provides a simple, efficient and environmentally friendly solution for the removal of uranium contamination, which has significant potential for future industrialization.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ning-xiao Wei,Yu-xing Wang,Hua-li Chen,Li-guang Wu,Ting Wang
In an effort to explore the potential application prospects of membrane separation technology in treating nuclear-contaminated wastewater, a TFN nanofiltration membrane incorporating the ZIF-8@Ti 3 C 2 T x nanocomposite was successfully synthesized using the interfacial polymerization method. This involved doping the microemulsion of ZIF-8@Ti 3 C 2 T x into the aqueous (organic) phase. The morphology and structure of ZIF-8@MXene nanocomposites and TFN nanofiltration membranes were characterized. The selective removal of ReO 4 - from simulated radioactive wastewater using the TFN nanofiltration membrane was evaluated. The results indicated that the ZIF-8@Ti 3 C 2 T x composite, uniformly dispersed in the polymer, effectively enhanced the pore structure and polarity of the nanofiltration membrane, thereby improving its permeability. The electronegativity of ZIF-8@Ti 3 C 2 T x also enhanced the negative charge on the surface of the polymer membrane, significantly improving the membrane’s performance in rejecting ReO 4 - while maintaining a low retention rate for Na + . This design facilitates the efficient selection of ReO 4 - from high-salinity wastewater. In addition, the layer spacing of Ti 3 C 2 T x further improved the screening of ReO 4 - and Na + . However, when 0.75 g·L −1 of microemulsion was added, it became challenging to disperse the microemulsion completely in the organic phase. This led to the agglomeration of composites in the nanofiltration membrane, weakening both flux and selectivity. Optimal performance was achieved with a microemulsion doping amount of 0.5 g·L −1 , resulting in the nanofiltration membrane M-O-1 exhibiting the best performance (Jp = 41.92 L·m 2 ·h −1 and R(ReO 4 - ) = 65.81%). Even at a high salt concentration (20 g·L −1 ), the M-O-1 membrane retained approximately 55% of pollutants after continuous operation for 5 h, indicating that the TFN nanofiltration membrane containing ZIF-8@Ti 3 C 2 T x holds significant promise for selectively extracting 99 Tc from wastewater with a high salt content.
研究领域:
环境科学
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材料科学
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水处理
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纳米技术
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）