JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
·
IF 4.383
Yong Yu,Zhongxiang Yang,Zhichao Shang,Xiaohong Wang
In this study, Bi/BiOCl nanosheets were prepared by a rapid, cost-efficient and one-step solution combustion synthesis method using a mixed fuel (glycine and tartaric acid). Through thermometry and thermogravimetric analysis/differential scanning calorimetry (TGA-DSC), the combustion mode and reaction mechanism are analyzed. The reducing gas produced by the mixed fuel is a necessary condition for obtaining metal Bi decorated BiOCl , and the content of Bi in the composite can be regulated by adjusting the molar ratio of Bi/Cl in reactants. In addition, under visible light irradiation, due to the SPR effect of metal Bi, Bi/BiOCl composite photocatalyst shows better photocatalytic performance, in which the highest degradation efficiency of Rhodamine B (RhB) within 120 min is 2.6 times higher than that of BiOCl. Thus, the present study provides an economic and convenient method for the tunable synthesis of a high-efficiency catalyst for the degradation of pollutants.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hongjing Tian,Jin Du,Peng Lu,Shengnan Xu,Yanxia Guo,Jixing Tang,Man Wu,Qingjie Guo
A novel solid bi-amine adsorbent was synthesized by simultaneously impregnating pentaethylenehexamine (PEHA) and aminoethylethanolamine (AEEA) on the surfaces of mesoporous MCM–41 nanospheres. AEEA and PEHA had a synergistic effect during the CO 2 adsorption of the bi-amine adsorbent and the highest CO 2 adsorption capacity was 4.03 mmol·g −1 . The bi-amine adsorbent exhibited the favorable recyclability because its saturated CO 2 adsorption capacity decreased by 6.20 % after the initial eight adsorption/desorption cycles while by only 2.23 % in the following seven cycles. The adsorption activation energy and the desorption activation energy were determined to be 12.53 and 16.81 kJ·mol −1 , respectively. The low value of the desorption activation energy suggested an inconsiderable energy requirement in the multicycles of the adsorbent. The characterization results indicated that hydrogen bonds were formed between the hydrogen atom in hydroxyl groups of AEEA and the oxygen atom in carbonyl groups of the carbamate. The synergistic effect between AEEA and PEHA was unveiled on the CO 2 adsorption of the bi-amine adsorbent. The formed hydrogen bonds facilitated the release of protons from carbamic acids, enhanced the stability of the produced carbamate anions, and thus boosted the CO 2 adsorption performance.
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Small
·
2022
·Vol. 19
·期 7
·2206407
·
IF 15.153
Mingfei Yu,Yueling Chen,Ming Gao,Guocheng Huang,Qiaoshan Chen,Jinhong Bi
Seeking highly-efficient, non-pollutant, and chemically robust photocatalysts for visible-light-driven ammonia production still remained challenging, especially in pure water. The key bottle-necks closely correlate to the nitrogen activation, water oxidization, and hydrogen evolution reaction (HER) processes. In this study, a novel Bi decorated imine-linked COF-TaTp (Bi/COF-TaTp) through N–Bi–O coordination is reasonably designed to achieve a boosting solar-to-ammonia conversion of 61 µmol −1 g −1 h −1 in the sacrificial-free system. On basis of serial characterizations and DFT calculations, the incorporated Bi is conducive to the acceleration of charge carriers transfer and N 2 activation through the donation and back-donation mode. The N 2 adsorption energy of 5% Bi/COF-TaTp is calculated to be −0.19 eV in comparison with −0.09 eV of the pure COF-TaTp and the electron exchange between N 2 and the modified catalyst is much more intensive. Moreover, the accompanied hydrogen production process is effectively inhibited by Bi modification, demonstrated by the higher energy barrier for HER over Bi/COF-TaTp (2.62 eV) than the pure COF-TaTp (2.31 eV) when using H binding free energy (Δ G H* ) as a descriptor. This work supplies novel insights for the design of photocatalysts for N 2 reduction and intensifies the understanding of N 2 adsorption and activation over covalent organic frameworks-based materials.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yuanyuan Zhang,Yuan Zhu,Tianjing Zeng,Lu Qiao,Mingjuan Zhang,Kexin Song,Nian Yin,Yani Tao,Yue Zhao,Chang Zhang,Yi Zhang
A highly sensitive photoelectrochemical aptasensor based on phosphorus-doped hollow tubular g-C 3 N 4 /Bi/BiVO 4 (PT-C 3 N 4 /Bi/BiVO 4 ) for tobramycin (TOB) detecting was developed. This aptasensor is a self-powered sensing system which could generate the electrical output under visible light irradiation with no external voltage supply. Based on the surface plasmon resonance (SPR) effect and unique hollow tubular structure of PT-C 3 N 4 /Bi/BiVO 4 , the PEC aptasensor exhibited an enhanced photocurrent and favorably specific response to TOB. Under the optimized conditions, the sensitive aptasensor presented a wider linearity to TOB in the range of 0.01–50 ng mL −1 with a low detection limit of 4.27 pg mL −1 . This sensor also displayed a satisfying photoelectrochemical performance with optimistic selectivity and stability. In addition, the proposed aptasensor was successfully applied to the detection of TOB in river water and milk samples.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Junfeng Yang,Yuyang Wu,Yanhui Dong,Hao Cui,Chenyang Shi,Hang Sun,Shengyan Yin
Herein, a ternary Bi@H-TiO 2 /B-C 3 N 4 type II heterostructure is successfully designed and prepared via metal Bi as cocatalyst for photocatalytic H 2 generation. As expected, under λ > 300 nm light, the highest photocatalytic hydrogen production rate (HPR) of Bi@H-TiO 2 /B-C 3 N 4 is up to 223.08 μmol g −1 h −1 . Excitingly, under visible light (λ > 400 nm), the highest HPR of Bi@H-TiO 2 /B-C 3 N 4 is increased to 18.84 μmol g −1 h −1 , which is about 67.3 times, 37.7 times and 6.8 times as high as that of H-TiO 2 , B-C 3 N 4 and H-TiO 2 /B-C 3 N 4 under the same conditions, respectively. Moreover, the electrochemical impedance spectroscopy and transient photocurrent tests manifest that the interface resistance of Bi@H-TiO 2 /B-C 3 N 4 composite decreases and the photocurrent density increases after loading metal Bi. These results indicate that loading metal Bi as cocatalyst (providing more electron trapping sites) is beneficial to improve photocatalytic activity in the type II heterostructure composite. And the electron transfer directions (B-C 3 N 4 → H-TiO 2 → Bi or B-C 3 N 4 → Bi) are proved by ultraviolet photoelectron spectroscopy test. Therefore, the Bi@H-TiO 2 /B-C 3 N 4 photocatalyst with strong visible light absorption is expected to be a promising candidate in photocatalytic fields under visible light.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Sihan Ma,Xian Luo,Guang Ran,Yipeng Li,Ziqi Cao,Xinyi Liu,Guoqiang Chen,Jianghua Yan,Lin Wang
Optical antibacterial agents present great potential in eliminating infectious pathogens. It is of great significance to construct effective photonic antibacterial agents with outstanding light absorption properties. Herein, 2D engineering defect nanosheets BiOI/Bi with Bi decoration and defect engineering (BiOI-DE) are constructed to perform photonic sterilization. On the one hand, the rational designed BiOI-DE can effectively promote the broad-spectrum light absorption ability to enhance the light utilization rate. On the other hand, the substantive structure can simultaneously harvest the enhanced photonic carriers and thermal effect when irradiated with high penetration ability NIR, further exhibiting higher activity in killing Escherichia coli (E. coli) than that of single BiOI with poor light absorption. The sterilization efficiency is over 99%. Moreover, the causes of the photothermal effect are discussed, indicating that the change of BiOI bandgap and surface bismuth decoration displays a critical role in enhancing light absorption and creating heat energy. In the meantime, the structural advancement of BiOI-DE effectively improves the photocatalytic activity, the synergistic photothermal-catalytic process establishes a favorable condition for improving antibacterial performance. This system provides rational design and potential inspiration for high efficient antibacterial strategy by employing defect engineering approaches.
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ChemSusChem
·
2022
·Vol. 15
·期 7
·e202200226
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IF 9.14
Huaxin Li,Xian Yue,Jing Che,Zhou Xiao,Xianbo Yu,Fenglei Sun,Chao Xue,Junhui Xiang
Graphical Networking at its best : The 3D self-supporting nanonetwork structure of Cu−Bi aerogels provides abundant reactive sites and electron transport channels for efficient electrocatalytic reduction of CO 2 to formate. The electrocatalytic reduction of CO 2 (CO 2 RR) to CO, formate, methane, and other high-value compounds is a promising technique. However, current electrocatalysts suffer from drawbacks such as few active catalytic sites, poor selectivity and low stability, etc, which restrict the practical application. Although monatomic metal catalysts have been widely reported in recent years, high performance non-noble metal aerogels were rarely investigated for electrocatalytic CO 2 RR. Herein, Cu−Bi aerogels with boosted CO 2 RR activity were well constructed by a simple one-step self-assembly method. The resultant Cu 1 Bi 2 exhibits excellent CO 2 RR activity with high faradaic efficiency (FE) of 96.57 % towards HCOOH at a potential of −0.9 V vs. RHE, and the FE HCOOH remains over 80.18 % in a wide potential window (−0.8 V to −1.2 V vs. RHE). It demonstrated that the enhanced CO 2 RR activity of Cu−Bi aerogels could be attributed to the 3D self-supporting structure of the catalysis, synergistic effect, and low interfacial charge transfer resistance.
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E-POLYMERS
·
2022
·Vol. 22
·期 1
·468-477
·
IF 3.074
Lin Chen,Ye Sun,Jiawen Wang,Chao Ma,Shuyi Peng,Xingyu Cao,Lang Yang,Chunxin Ma,Gaigai Duan,Zhenzhong Liu,Hui Wang,Yihui Yuan,Ning Wang
Although diverse uranium (U) adsorbents have been explored, it is still a great challenge for high-efficient uranium extraction form seawater. Herein a wood-mimetic oriented porous Ti 3 C 2 T
x
-MXene/gelatin hydrogel (MGH) has been explored through growing directional ice crystals cooled by liquid nitrogen and subsequently forming pores by freeze-dry (Ice-template) method, for ultrafast and high-efficient U-adsorption from seawater with great enhancement by both electric field and sunlight. Different from disperse Ti 3 C 2 T
x
-MXene powder, this MGH not only can be easily utilized but also can own ultrahigh specific surface area for high-efficient U-adsorption. The U-adsorbing capacity of this MGH (10 mg) can reach 4.17 mg·g −1 after only 1 week in 100 kg of seawater, which is outstanding in existing adsorbents. Furthermore, on the positive pole of 0.4 V direct current source or under 1-sun irradiation, the U-adsorbing capacity of the MGH can increase by 57.11% and 13.57%, respectively. Most importantly, the U-adsorption of this hydrogel can be greatly enhanced by simultaneously using the above two methods, which can increase the U-adsorbing capacity by 79.95% reaching 7.51 mg·g −1 . This work provides a new biomimetic porous MXene-based hydrogel for electric field/sunlight bi-enhanced high-efficient U-extraction from seawater, which will inspire new strategy to design novel U-adsorbents and systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Zinan Huang,Liuqing He,Wenbiao Zhang,Wenjie Huang,Qijie Mo,Lichun Yang,Qiang Fu,Qingsheng Gao
Bi-functional electrocatalysts are desired for both hydrogen and oxygen evolution reactions (HER and OER). Herein, facile O 2 -plasma activation is introduced to improve the bi-functionality via constructing nickel sulfide-oxide heterostructures . Ni 3 S 2 -NiO x supported by nickel foam delivers obviously elevated HER and OER activity in comparison with pristine Ni 3 S 2 and recently reported NiS x -based electrocatalysts , featured by the low overpotentials for HER (104 mV) and OER (241 mV) at ±10 mA cm −2 in 1.0 M KOH, as well as a voltage of 1.52 V for overall water splitting. As revealed by in-situ Raman spectroscopy , on the one hand, Ni(OH) 2 generated from Ni 3 S 2 during alkaline HER accelerates water dissociation toward the gradually improved performance; on the other hand, this heterostructure undergoes extensive oxidation during OER, leading to excessive NiOOH covering on Ni 3 S 2 and thereby declining activity. These changes are interpreted by the distinct thermodynamic relationship under specific electrochemical conditions via density functional theory calculations.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xiaoxi Li,Weiwei Li,Mengling Xia,Chao Liu,Neng Li,Zuhao Shi,Yinsheng Xu,Xianghua Zhang
Lead-free double perovskites (DPs) have outstanding luminescent properties, which make them excellent candidates for wide use in optoelectronics. Herein, a solvent-free melting-crystallization technique, which can produce kilogram-scale DP microcrystals (DP-MCs) in one batch, is invented to synthesize the Cs2NaxAg1–xInCl6: Bi (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) DP-MCs. The structure and composition analysis confirmed the products are pure Cs2NaxAg1–xInCl6 DP-MCs. Affected by Jahn–Teller distortion of AgCl6 octahedra, self-trapped excitons appear in the excited state, resulting in the broadband emission (400–850 nm) of Cs2Ag1–xNaxInCl6: Bi DP-MCs. The enhancement of the photoluminescence quantum yield can be realized by introducing Na+ to break the parity-forbidden transition in the Cs2AgInCl6 DP. Optimized Cs2Na0.4Ag0.6InCl6: Bi DP-MC phosphors combined with commercial blue and green phosphors were coated on ultraviolet chips (365 nm) to fabricate white light-emitting diodes (WLEDs) from warm white (2930 K) to cold white (6957 K). An ultrahigh color rendering index of 97.1 and a CCT of 5548 K as well as Commission Internationale de l’Eclairage color coordinates of (0.331, 0.339) have been demonstrated. This kilogram-scale synthesis technique could stimulate the industrial development of WLEDs for general lighting based on DP-MC phosphors.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Weifeng Xu,Xiang Liu,Kewen Tang
A novel bi-functional β-cyclodextrin polymer (CD@TCT@PEI) was synthesized for the removal of hydroquinone and Pb(II) from wastewater. The structure and adsorption performance of CD@TCT@PEI towards hydroquinone and Pb(II) were studied comprehensively. Both of the adsorption processes fit the pseudo-second-order kinetic model well. The adsorption isotherms of hydroquinone and Pb(II) could be described well by Langmuir isotherm model, and the maximum adsorption capacities of hydroquinone and Pb(II) are 364.86 and 113.52 mg g −1 , respectively. The adsorption of hydroquinone and Pb(II) on CD@TCT@PEI is an exothermic and spontaneous process. The adsorbed CD@TCT@PEI could be regenerated easily, and can still maintain high adsorption performance after 5 cycles. The electrostatic interaction and coordination interaction account for the adsorption of Pb(II), and inclusion of cyclodextrin and hydrogen-bond interaction are responsible for hydroquinone adsorption. This study provides some insights to design an adsorbent that can simultaneously remove heavy metal ions and organic micropollutants from wastewater.
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INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Huimin Huang,Yuandong Wu,Shuangsheng Cheng,Shaoguo Wen,Yi Qu,Thomas Doert,Dajiang Mei
A new bismuth(III) complex [(1,10-phen)Bi(C 2 O 4 ) 1.5 ], 1,10-phen = 1,10-phenanthroline, was synthesized with oxalate and phen ligands without by-products. The title complex was characterized by single crystal X-ray diffraction, FT-infrared Spectrum, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). 2D bismuth - oxalate - bridged layers are formed by oxalate ligands. Phen ligands are embedded in it which further stabilize the structure. The luminescence properties show that [(1,10-phen)Bi(C 2 O 4 ) 1.5 ] can emit blue-green fluorescence, and π - π stacking and ligand-to-metal-charge transfer (LMCT) are predominant in it, which may have potential applications in the fields of crystal luminescent materials.
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