SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Cuilian Wei,Haowei Tu,Pengcheng Zhang,Jiafeng Ouyang,Liyong Yuan,Zijie Li,Nannan Wang,Yanqiu Zhu,Kang Liu,Lin Wang,Weiqun Shi
The construction of novel MXene-based composites with superb abilities through functionalization is an effective strategy to enhance the potential of this emerging inorganic lamellar material for environmental adsorption applications. The present work systematically investigated the adsorption performance of Ti 3 C 2 T x MXene modified with phosphate functional groups that facilitate the capture of uranyl ions. After introducing phosphate groups via a two-step modification of 3-aminopropyltriethoxysilane (APTES) and phytic acid (PA), the synthesized Ti 3 C 2 -APTES-PA is significantly superior to pristine Ti 3 C 2 T x nanosheets in terms of adsorption capacity, adsorption selectivity and reusability for uranium. The maximum uptake capacity of Ti 3 C 2 -APTES-PA at pH = 5 reaches 323 mg/g, which is 2.5 times higher than that of unmodified MXene. Furthermore, the large selectivity coefficient (S U/M > 16.2) declares that Ti 3 C 2 -APTES-PA preferentially adsorbs uranium among substantial competing ions. Ti 3 C 2 -APTES-PA also shows good cycling performance that its adsorption capacity remained 92.3 % after 6 cycles. When it comes to treating simulated uranium tailings pond leachate and radioactive wastewater from mines, high U(VI) removal rates of 88.9 % and 96.8 % can be achieved by our ternary composite at a dosage of 0.05 g/L. The underlying adsorption mechanism was unraveled by spectroscopic analysis to be the formation of coordination complexes of uranyl ions with phosphate groups on PA and hydroxyl groups on Ti 3 C 2 T x substrate, as well as the reduction of a small amount of adsorbed U(VI) to U(IV) by MXene. The overall results imply that Ti 3 C 2 -APTES-PA is an effective uranium chelating scavenger for the treatment of environmental radioactive wastewater.
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
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-15
·
IF 12.264
Liu Siyang,Hu Fangyuan,Shao Wenlong,Zhang Wenshu,Zhang Tianpeng,Song Ce,Yao Man,Huang Hao,Jian Xigao
2D MXenes are attractive for energy storage applications because of their high electronic conductivity. However, it is still highly challenging for improving the sluggish sodium (Na)-ion transport kinetics within the MXenes interlayers. Herein, a novel nitrogen-doped Ti 3 C 2 T x MXene was synthesized by introducing the in situ polymeric sodium dicyanamide (Na-dca) to tune the complex terminations and then utilized as intercalation-type pseudocapacitive anode of Na-ion capacitors (NICs). The Na-dca can intercalate into the interlayers of Ti 3 C 2 T x nanosheets and simultaneously form sodium tricyanomelaminate (Na 3 TCM) by the catalyst-free trimerization. The as-prepared Ti 3 C 2 T x /Na 3 TCM exhibits a high N-doping of 5.6 at.% in the form of strong Ti–N bonding and stabilized triazine ring structure. Consequently, coupling Ti 3 C 2 T x /Na 3 TCM anode with different mass of activated carbon cathodes, the asymmetric MXene//carbon NICs are assembled. It is able to deliver high energy density (97.6 Wh kg −1 ), high power output (16.5 kW kg −1 ), and excellent cycling stability (≈ 82.6% capacitance retention after 8000 cycles).
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Zijie Mo,Pingjing Mo,Mingming Yi,Ziyue Hu,Guizhen Tan,Mohamed S. Selim,Yuanzhou Chen,Xiang Chen,Zhifeng Hao,Xiaolan Wei
The phase change materials (PCMs) are attractive and environmental-friendly way to improve the utilization rate in the field of photothermal conversion and solar radiation storage. However, the low photothermal conversion efficiency and low thermal conductivity characteristics of PCMs limit their practical applications. In order to improve the performance of these materials, we developed a novel polyethylene glycol (PEG 2000) PCMs composites supported by Ti 3 C 2 T x @polyvinyl alcohol (PVA) foam skeleton with several advantages like low-cost, scalable and simple preparation method by freeze-drying after PEG being introduced into the skeleton via vacuum impregnation. The thermal conductivity of Ti 3 C 2 T x /PEG composite containing 7.68 wt% skeleton was notably high as 0.428 W/(m·K)，which was 4.2 times higher than PEG 2000 (0.101 W/(m·K)). The improvement of thermal conductivity was mainly derived from the three-dimensional interconnected structures of the foamy skeleton. The actual phase change enthalpy of composite searched up to 131.1 J/g, and its photothermal conversion efficiency achieved 96.5%, demonstrating excellent photothermal conversion and storage ability. Furthermore, the Ti 3 C 2 T x /PEG composite exhibited structural stable property that avoids leakage of liquefied PCM during melting process. This multifunctional Ti 3 C 2 T x @PVA/PEG PCM provided a prospective application in thermal energy management systems regarding its high thermal conductivity , excellent photothermal conversion efficiency, thermal energy storage (TES) capability and structural stability.
研究领域:
材料科学
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能源工程
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太阳能技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Jiapeng Liu,Yizhe Liu,Danyun Xu,Yuanzhi Zhu,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Developing highly efficient noble-metal-free electrocatalysts for hydrogen evolution reaction (HER) has attracted increasing attentions. Here, we report a simple strategy to synthesize the hierarchical “nanoroll” like MoS 2 /Ti 3 C 2 T x hybrid by combining liquid nitrogen-freezing and subsequent annealing. The quick freezing of the Ti 3 C 2 T x nanosheets and ammonium tetrathiomolybdate mixture causes a sudden change in the strain of Ti 3 C 2 T x , which leads to an interesting “nanoroll” like hierarchical structure. After annealing at H 2 /Ar atmosphere, vertically aligned molybdenum sulfide (MoS 2 ) crystallites are in situ formed in and on the nanoroll like Ti 3 C 2 T x . Notably, this hierarchical MoS 2 /Ti 3 C 2 T x hybrid exhibits excellent HER catalytic activity with a small onset overpotential of 30 mV, and a more than 25-fold increase in the exchange current density compared with MoS 2 was observed.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-10
·
IF 16.419
Shi Bao,Li La,Chen Aibing,Jen Tien-Chien,Liu Xinying,Shen Guozhen
Highlights
Ti 3 C 2 T x MXene-based coaxial zinc-ion hybrid fiber supercapacitors (FSCs) were fabricated with braided structure, which can be prepared continuously and present excellent flexibility and ultrastability.
A sports watch driven by the watch belts which weaved uses the obtained zinc-ion hybrid FSC and LED arrays lighted by the FSCs under embedding into textiles, demonstrating the great potential application in smart wearable textiles.
Abstract Zinc-ion hybrid fiber supercapacitors (FSCs) are promising energy storages for wearable electronics owing to their high energy density, good flexibility, and weavability. However, it is still a critical challenge to optimize the structure of the designed FSC to improve energy density and realize the continuous fabrication of super-long FSCs. Herein, we propose a braided coaxial zinc-ion hybrid FSC with several meters of Ti 3 C 2 T x MXene cathode as core electrodes, and shell zinc fiber anode was braided on the surface of the Ti 3 C 2 T x MXene fibers across the solid electrolytes. According to the simulated results using ANSYS Maxwell software, the braided structures revealed a higher capacitance compared to the spring-like structures. The resulting FSCs exhibited a high areal capacitance of 214 mF cm –2 , the energy density of 42.8 μWh cm −2 at 5 mV s −1 , and excellent cycling stability with 83.58% capacity retention after 5000 cycles. The coaxial FSC was tied several kinds of knots, proving a shape-controllable fiber energy storage. Furthermore, the knitted FSC showed superior stability and weavability, which can be woven into watch belts or embedded into textiles to power smart watches and LED arrays for a few days.
研究领域:
材料科学
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能源存储技术
·
柔性电子
✓ 已验证
DOI
高影响因子
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