APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Jun Cai,Yi Xia,Ruiqi Gang,Sufang He,Sridhar Komarneni
Defect engineering and heterogeneous doping are considered as the effective routes to improve the photocatalytic activity of MoS 2 . In this study, tungsten was used to produce sulfur defects and tungsten doping on MoS 2 by one step hydrothermal treatment. Tungsten doping not only promotes the formation of sulfur defects, but also accelerates the efficiency of separation and transfer of electron-hole pairs, which enables the samples to maintain high catalytic oxidation activity for a long time. Furthermore, comparative experiments show that sulfur defects can promote the activation of O 2 and the formation of more active O 2 - and ·OH species. As a result, the W-doped MoS 2 exhibited a high removal efficiency of more than 99% of gaseous mercury. In addition, W-doped MoS 2 showed good stability, long term durability, enhanced water and sulfur resistance under light illumination. This work provides a novel direction for designing efficient photocatalysts based on transition metal dichalcogenides.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Yong Yuan,Haomiao Xu,Wei Liu,Lihong Chen,Zongwen Quan,Ping Liu,Zan Qu,Naiqiang Yan
Porous structure and effective active site are beneficial for gaseous elemental mercury (Hg 0 ) capture. Two kinds of hierarchical porous layered double hydroxides (LDHs) were synthesized through an in-situ growth method. Sulfur was used for the modification of these LDHs to enhance Hg 0 removal performance. Two as-prepared NiAl-S 4 @SiO 2 microspheres displayed three-dimensional morphologies, accordingly exhibited as core-shell and urchin-like morphologies. XRD , BET, FTIR, TEM and SEM were employed to investigate the structure effect on Hg 0 uptake. The results indicated that after S-modification, the Hg 0 removal efficiencies as well as SO 2 resistance were enhanced. The Hg 0 removal performances follow the order of: NiAl-S 4 @SiO 2 -urchin > NiAl-S 4 @SiO 2 -core at 100 °C. The mechanism for Hg 0 removal was discussed based on the results of TPD , EDX and XPS . The porous structure of NiAl-S 4 @SiO 2 composite was beneficial for gas transformation and intercalated [S 4 ] 2− ions were favorable for mercury uptake. The polysulfide combined with adsorbed mercury and formed HgS. Such materials exhibit promising potential for mercury uptake from S Hg mixed flue gas.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jun Cai,Yibing Xie,Chong Ma,Xueqian Wang,Langlang Wang,Ping Ning,Yixing Ma
Photocatalytic oxidation of gaseous heavy metals is an efficient approach to alleviate energy crises and environmental pollution. In this study, a novel two-step solvothermal method was designed to synthesize reduced graphene oxide (rGO)-modified bismuth oxyhalide (BiOX, X = Cl, I, Br) nanosheets. The modification of rGO led to the significant enhancement in the specific surface area of BiOX nanosheets, reduction in the bandgap, improvements in the light absorption range and intensity, acceleration in the photogenerated carrier separation rate, and reduction in the photogenerated electron − hole complexation. Furthermore, both O 2 – and OH were demonstrated to be active species in the reaction. Owing to these achievements, all samples displayed significantly improved photocatalytic performance. Furthermore, the rGO-modified samples exhibited excellent stability and maintained the highest mercury removal efficiency after several cycles. However, the samples prepared in this research displayed a high level of moisture resistance. These characteristics of BiOX-based materials make them potential candidates for the photocatalytic removal of heavy metals from industrial waste gases.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Food
·
2024
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IF 23.6
Tang Wenli,Bai Xu,Zhou Yang,Sonne Christian,Wu Mengjie,Lam Su Shiung,Hintelmann Holger,Mitchell Carl P. J.,Johs Alexander,Gu Baohua,Nunes Luís,Liu Cun,Feng Naixian,Yang Sihai,Rinklebe Jörg,Lin Yan,Chen Long,Zhang Yanxu,Yang Yanan,Wang Jiaqi,Li Shouying,Wu Qingru,Ok Yong Sik,Xu Diandou,Li Hong,Zhang Xu-Xiang,Ren Hongqiang,Jiang Guibin,Chai Zhifang,Gao Yuxi,Zhao Jiating,Zhong Huan
Dietary exposure to methylmercury (MeHg) causes irreversible damage to human cognition and is mitigated by photolysis and microbial demethylation of MeHg. Rice ( Oryza sativa L.) has been identified as a major dietary source of MeHg. However, it remains unknown what drives the process within plants for MeHg to make its way from soils to rice and the subsequent human dietary exposure to Hg. Here we report a hidden pathway of MeHg demethylation independent of light and microorganisms in rice plants. This natural pathway is driven by reactive oxygen species generated in vivo, rapidly transforming MeHg to inorganic Hg and then eliminating Hg from plants as gaseous Hg°. MeHg concentrations in rice grains would increase by 2.4- to 4.7-fold without this pathway, which equates to intelligence quotient losses of 0.01–0.51 points per newborn in major rice-consuming countries, corresponding to annual economic losses of US$30.7–84.2 billion globally. This discovered pathway effectively removes Hg from human food webs, playing an important role in exposure mitigation and global Hg cycling.
研究领域:
环境科学
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植物生物学
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毒理学
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公共卫生
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Qinyuan Hong,Haomiao Xu,Jiaxing Li,Wenjun Huang,Ping Liu,Zan Qu,Naiqiang Yan
Inducing gaseous substances to migrate inward into a solid material is one of the effective methods to improve the interfacial adsorption stability. However, the gaseous mercury (Hg 0 ) adsorption on bulk material, especially mineral sulfides , generally occurred on the outer surface owing to their compact structure, resulting in the low bonding stability. This study prepared porous [email protected] with different shell thickness to investigate mercury adsorption performance and bonding stability. The porous shell structure enabled Hg 0 to migrate inward into [email protected] Such an inducing effect, on one hand, improved the mercury adsorption performance due to the increase of active sites with the thickened shell. On the other hand, the mercury bonding stability was enhanced along with the increase of shell thickness. The initial mercury desorption temperature gradually increased from 50 to higher than 100 °C, and meanwhile, the desorption peak temperature increased from 150 to 275 °C. The improved bonding stability also enlarged its adaption to a wider temperature window (50–150 °C). Moreover, the optimal [email protected] has a saturated adsorption capacity of 60.53 mg/g, and it has high resistance against O 2 , SO 2, and H 2 O. This work thus offers a promising thickness-induced method to enhance the mercury bonding stability on sulfides.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Wei Zheng,Zequn Yang,Jiefeng Chen,Mingguang Zhang,Hongxiao Zu,Ruiyang Qin,Wenqi Qu,Jianping Yang,Lijian Leng,Hailong Li
Utilization of monolithic mineral sulfide-based sorbent for the fix-bed elemental mercury (Hg 0 ) removal is regarded as a predominant predicament in the field of Hg 0 abatement. In this work, a general and facile route was exploited to establish CuS particles decorated 3D porous Ti 3 C 2 T x MXene aerogel via divalent Cu 2+ cations induced assembly combined with subsequent high-temperature sulfurization treatment, during which, uniform CuS particles were homogeneously anchored throughout the Ti 3 C 2 T x substrate. The obtained 3D CuS/Ti 3 C 2 T x MXene aerogel exhibited satisfactory textural property, hierarchical pore structure and strong interaction between Ti 3 C 2 T x MXene and CuS. Meanwhile, the inherent restacking of Ti 3 C 2 T x MXene nanosheet and serious agglomeration of CuS can also be effectively avoided in the formation of aerogel. Those structural advantages originating from this novel gelation process favorably contributes to satisfactory Hg 0 mass transfer and sufficient utilization of CuS active ligands, which largely strengthens Hg 0 removal performance and broadens the fix-bed application of mineral sulfides. Consequently, the Hg 0 capture capacity and adsorption rate of CuS/Ti 3 C 2 T x MXene aerogel reached 90596.4 g m −3 and 120.64 g m −3 min −1 , respectively, far outbalancing those of the reported in-situ selenized copper foam with excellent Hg 0 removal activity. The impressive Hg 0 sequestration performance is attributed to its relatively large specific surface area, layered pore channel, and highly dispersed CuS particles, largely boosting Hg 0 mass transfer and following sequestration. Moreover, other mineral sulfides/Ti 3 C 2 T x MXene aerogels can also be constructed by just replacing divalent metal cations, which makes the initial effort towards the fix-bed utilization of mineral sulfides-based aerogel for vapor-phase Hg 0 immobilization.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）