ENVIRONMENTAL POLLUTION
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2021
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IF 8.071
Han Zhang,Ronghua Li,Zengqiang Zhang
At present, the simultaneous removal of organic dyes and heavy metals in complex wastewater has raised considerable concern, owing to their striking differences in physicochemical properties . Adsorption, as one of the few removal methods, has attracted extensive attention and gained popularity. Herein, a versatile EDTA and chitosan bi-functionalized magnetic bamboo biochar adsorbent (ECMBB) was synthesized for coinstantaneous adsorption of methyl orange (MO) and heavy metals (Cd(II) and Zn(II)). In this case, the as-synthesized ECMBB composites inherited favorable anionic MO removal performance from bamboo biochar (BB) obtained at 700 °C through electrostatic attraction, hydrogen bonding and π-π interaction, also enhanced the binding of cationic metals by introducing amino groups of chitosan and carboxyl groups of EDTA. In the unitary system, the removal of MO, Cd(II) and Zn(II) by three as-prepared adsorbents can be well illuminated by pseudo-second-order kinetic model and Langmuir isotherm theory. The saturated capture amounts of ECMBB at 25 °C are 305.4 mg g −1 for MO, 63.2 mg g −1 for Cd(II) and 50.8 mg g −1 for Zn(II), which, under the same conditions, are 1.3, 2.6 and 2.5 times those of chitosan-modified magnetic bamboo biochar (CMBB) and 1.9, 6.1 and 5.4 times those of magnetic bamboo biochar (MBB), respectively. Remarkably, in MO-metal binary system, coexisting MO visibly enhanced the adsorption of Cd(II) and Zn(II), while coexisting heavy metals had no significant impact on MO adsorption. Furthermore, ECMBB exhibited no significant loss in adsorption efficiency even after eight adsorption-desorption experiments. This study lays the foundation for fabricating desired integrative biochar adsorbents in the simultaneous purification of organic and metallic pollutants from complex wastewater.
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Molecular Catalysis
·
2021
·
IF 5.062
Ruixue Wu,Caifeng Bi,Xia Zhang,Jinmiao Wang,Lulu Wang,Chuanbin Fan,Mei Wang,Feng Shao,Nana Li,Ziao Zong,Yuhua Fan
Two novel Co-MOFs constructed from aromatic polycarboxylic acid named {[Co(tib) 2 (bimb) 2 ]·4H 2 O} n (tib = 3-((4-(1H-1,2,4-triazol-1-yl)benzyl)oxy)benzoic acid, bimb = 1,4-bis(imidazole-1-ylmethy) benzene) and {[Co 2 (bipa) 4 (bibp) 6 ]} n (bipa = 2-(4-carboxy-2-nitrophenoxy)-6-nitroterephthalic acid, bibp = 4,4′-bis(imidazolyl) biphenyl), have been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric analysis (TG) as well as electrochemistry. The single-crystal X-ray diffraction analysis indicates that Co-MOF 1 exhibits an uninodal net with a (6 5 ·8) topology, whereas Co-MOF 2 exhibits an uninodal 4-connected framework with a (4 4 ·6 2 ) topology. The electrochemistry studies demonstrate that both of the two Co-MOFs can behave as the efficient electrocatalysts for water oxidation in a mild neutral system at the potential around 1.20 V vs. NHE with comparatively low overpotential ( η ) for Co-MOF 1 and 2 of 337–541 mV vs. NHE. Moreover, the two Co-MOFs also show good photocatalytic degradation capabilities toward MB/MV dyes under UV irradiation, and the mechanism studies demonstrate that the main active species are · OH radicals. Therefore, these bi-functional Co-MOFs materials can be treated as convenient and efficient catalysts for the oxygen evolution reaction and aromatic dyes degradation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Peng Liu,Huiling Liu,Shun Zhang,Jie Wang,Cheng Wang
Electroreduction of carbon dioxide (CO 2 ) into formic acid/formate has been considered as one of the most promising strategies for obtaining value-added fuels and chemical productions. Herein, we present a general method for preparing Bi-based electrocatalysts via in situ reduction of bismuth oxyiodide (BiOI) in CO 2 -saturated electrolyte. The precursors of BiOI nanoplates (P-nanoplates) with thickness of 30–40 nm could be easily obtained and provide a concise model to probe the mechanisms of CO 2 reduction to formate. BiOI nanoplates precursors derived Bi nanosheets (P-nanoplates-Bi) exhibited an excellent performance for CO 2 reduction to formate, achieving Faradaic efficiencies (FEs) over 80% in a wide potential window and a maximum FE approaching of 95% with a current density of 13.3 ± 0.6 mA cm −2 at −0.9 V versus reverse hydrogen electrode (υs. RHE). Such P-nanoplates-Bi nanosheets showed a stable electrocatalytic actitivity during 15 h operation in 0.5 M KHCO 3 aqueous solution. The superior performance is mainly attributed to the two-dimensional (2D) Bi nanosheets, which can increase CO 2 •- adsorption, enlarge active surface area, show better reaction kinetics and provide lower contact resistance with accelerated electron transfer . For comparison, precursors of BiOI plate-like (P-bulk) with doubled thicknesses and ultrathin BiOI with a few nanometers derived Bi catalysts tend to agglomerate and appear as irregular structured Bi nanoparticles during the reaction. Their peak FEs for formate are much lower than those of P-nanoplates derived Bi nanosheets at −0.9 V.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Ran Li,Deliang Zhang,Huamao Chen,Shaozhen Wang,Yunyun Ling,Caihong Fang
Developing high-performance and low-cost electrocatalysts for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR) is essential for hydrogen production. Herein, we prepared Zn,S-incorporated Fe,Co layered double hydroxide (ZnCoFeS–LDH) nanosheets on nickel foam via a two-step hydrothermal reaction. The attractive two-dimensional (2D) nanosheet morphology with ultrathin thickness offers abundant active sites, promotes the adsorption and desorption of intermediates on the surface, and also facilitates mass transportation. The electronic structure of ZnCoFeS–LDH was modified, which thus improves their conductivity, offers high-valence iron ions (Fe3+), and therefore intrinsically enhances their electrocatalytic properties. In particular, the constructed crystalline/amorphous interfaces benefit electron transfer between different phases. As a proof of concept, we examined the electrocatalytic performances of ZnCoFeS–LDH nanostructures to both the OER and UOR. As a result, the ZnCoFeS–LDH nanosheets exhibit excellent catalytic OER activity, with low overpotentials of 202, 217, 238, and 261 mV to achieve current densities of 10, 20, 50, and 100 mA cm–2, respectively, which are remarkably enhanced in comparison with that of commercial RuO2. Furthermore, they also demonstrate outstanding durability after long-term (48 h) and cycling (5000 cycles) measurements. Moreover, the ZnCoFeS–LDH nanosheets also possess superior UOR activity. The potentials were measured to be as low as 1.313, 1.334, 1.366, and 1.398 V to reach current densities of 10, 20, 50, and 100 mA cm–2, respectively, with high long-term stability after 20 h.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Boran Yang,Nannan Song,Zhongwei Chen,Yuan Yu,Zhiquan Chen,Feng Rong,Tingting Chen,Yong Guo,Kai Wang,Chao Feng,Juncheng Jiang
Manufacturing fire-resistant, tough, and durable epoxy resin (EP) is a challenging task. Traditional flame retardants derived from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) tend to aggregate and plasticize, causing a decline in glass transition temperature (T g ) and mechanical properties of EP. To overcome this issue, a bulky aromatic DOPO-based derivative called PPCANT was synthesized successfully using biomass-derived cinnamaldehyde (CA). The steric hindrance and intermolecular interactions (π-π stacking) of PPCANT's mitigated T g deterioration and significantly improved mechanical properties. Incorporating 5 wt% PPCANT into the EP (EP/PPCANT-5) achieved a limiting oxygen index (LOI) of 32.6% and UL-94 V-0 rating, reducing both total heat release and smoke production. Moreover, PPCANT endowed the EP with exceptional char-forming ability. Analysis of the flame retardant mechanism indicated that the PPCANT structure imparted an ideal flame quenching mechanism, characterized by the instantaneous extinction of flames caused by the blowout of PO·/PO 2 radicals, and a dilution effect of free radicals from non-flammable gases. In addition, the incorporation of nitro and amino groups in PPCANT facilitates the formation of hydrogen bonds with the hydroxyl groups generated in the ring-opened EP, leading to a significant decrease in the hydrophilicity of EP. These findings highlight PPCANT as a promising flame retardant that simultaneously enhances flame retardancy, mechanical strength , and hydrophobicity in EP materials.
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Biotechnology for Biofuels and Bioproducts
·
2023
·Vol. 16
·期 1
·1-13
·
IF 0
Yang Fan,Liu Jiashu,Li Bianxia,Li Huanan,Jiang Zhengbing
Background As a cost-effective and eco-friendly approach, biocatalysis has great potential for the transformation of 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA). However, the compatibility of each enzyme in the cascade reaction limits the transformation efficiency of HMF to FDCA. Results Coupled with an alcohol oxidase from Colletotrichum gloeosporioides ( Cgl AlcOx), this study aims to study the potential of bacterial laccase from Bacillus pumilus ( Bp Lac) in an enzymatic cascade for 2,5-furandicarboxylic acid (FDCA) biosynthesis from 5-hydroxymethylfurfural (HMF). Bp Lac showed 100% selectivity for HMF oxidation and generated 5-hydroxymethyl-2-furancarboxylic acid (HMFCA). Cgl AlcOx was capable of oxidizing HMFCA to 2-formyl-5-furancarboxylic acid (FFCA). Both Bp Lac and Cgl AlcOx could oxidize FFCA to FDCA. At the 5 mM scale, a complete transformation of HMF with a 97.5% yield of FDCA was achieved by coupling Bp Lac with Cgl AlcOx in the cascade reaction. The FDCA productivity in the reaction was 5.3 mg/L/h. Notably, Bp Lac could alleviate the inhibitory effect of FFCA on Cgl AlcOx activity and boost the transformation efficiency of HMF to FDCA. Moreover, the reaction was scaled up to 40 times the volume, and FDCA titer reached 2.6 mM with a yield of 58.77% at 168 h. Conclusions This work provides a candidate and novel insight for better design of an enzymatic cascade in FDCA production.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Mengqiu Huang,Lei Wang,Ke Pei,Bangxin Li,Wenbin You,Liting Yang,Gang Zhou,Jincang Zhang,Chongyun Liang,Renchao Che
Heterogeneous interface regulation plays an important role in tailoring the intrinsic electromagnetic (EM) properties for obtaining excellent EM wave absorption, which still faces huge challenge. In this work, bi-metal MOFs-derived ZnFe 2 O 4 –ZnO-Fe@C (ZZFC) microspheres with custom-built heterogeneous interfaces are successfully fabricated via a confined growth strategy. Bi-metal Fe–Zn–ZIF with tailored coordination structure and chemical bonding are first selected as the precursor template. After undergoing the annealing process, the metal Fe 2+ host is converted into magnetic Fe nanoparticles (NPs). The Zn 2+ host is transformed into semiconductor zinc oxide (ZnO) with increasing (101) crystal-oriented growth. At the same time, metal hosts Fe 2+ and Zn 2+ are further reacted to synthesize the zinc ferrite (ZnFe 2 O 4 ). Formed Fe nanoparticles catalyze organic ligands to constitute graphitized carbon layers, which confine the further growth of ZnFe 2 O 4 , ZnO, and Fe NPs. Combined with the well impendence and synergy absorption mechanism (magnetic loss, interface polarization, and conduction loss), optimized magnetic–dielectric ZnFe 2 O 4 –ZnO-Fe@C microspheres exhibit outstanding EM wave absorption with the minimum reflection loss −66.5 dB at only 2.0 mm thickness. Bi-metal MOF-derived magnetic–dielectric absorption materials with tailored heterogeneous interfaces provide a new sight to design an efficient EM wave absorption system.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yucai Lu,Jiuyu Chen,Baozhong Zhu,Jiquan Wang,Cong Jiang,Minggao Xu,Yunlan Sun
Aluminum-containing hydrocarbon fuels cannot fully release their energy due to the poor dispersion and easy agglomeration of aluminum nanoparticles (ANPs). To solve the issues, oleic acid (OA) was used to modify the surface of ANPs, and then Al@OA particles were incorporated into exo-tetrahydrodicyclopentadiene (JP-10) to form Al/JP-10 bi-phase system. Experimental and molecular simulation methods were used to analyze the stability, ignition, and combustion performance of the Al/JP-10 bi-phase system. The results show that at low temperatures, OA can improve the antioxidant and hydrophobic performance of Al@OA particles, which can effectively protect the ANPs from deep oxidation . At high temperatures, OA can accelerate the oxidative exothermic process of ANPs, and the Al@OA particles can shorten the ignition delay time of JP-10 droplets and intensify the combustion. Notably, when the ratio of Al and OA is 10:3 in the Al@OA particles, the Al/JP-10 droplet exhibits the shortest ignition delay.
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APPLIED ENERGY
·
2023
·
IF 11.2
Shuang Liu,Limin Ma,Cheng Zhen,Dan Li,Yishu Wang,Qiang Jia,Fu Guo
Bismuth telluride-based thermoelectric (TE) devices were widely used in waste heat recovery due to their high thermoelectric figure of merit (ZT), but the severe diffusion between Sn-based solder and TE pillar generated porous and brittle Sn-Te intermetallic compound (IMC), which seriously restricted the reliable service of devices. Ni-based coating was used but the thick Ni-Te IMC also impaired the properties of TE pillars. In this work, the crystalline Co-P coating was inserted between the p-type TE material Bi 0.5 Sb 1.5 Te 3 and the solder by electrodeposition, and the power generation sustainability of the TE pillar were significantly improved, and the mechanism was revealed. The microstructural characterization proved that the Co-P coating could effectively resist the diffusion of active Sn, Bi, Sb, Cu atoms. Co-P coating would provide support for the structural integrity and performance sustainability of TE pillars. It was worth noting that an ultrathin CoTe 2 IMC layer was formed between the Co-P coating and the Bi-Sb-Te pillar, which was much thinner than the Ni-Te IMC layer reported in the literature. This indicated that Co-P only consumed little thermoelectric elements, but also a good metallurgical bond was formed between the Co-P and the Bi-Sb-Te. After aging at 423 K for 150 h, the maximum output power and average Seebeck coefficient of the TE pillar without coating dropped significantly by 74% and 34%, respectively, and the internal resistance rose by 67%. Remarkably, the maximum output power and average Seebeck coefficient of the TE pillar protected by the Co-P coating only decreased by 14% and 5%, respectively, and the internal resistance only increased by 6%.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiuling Li,Yanan Pang,Yongle Zhang,Bo Ge,Junchang Liu,Yuling Zhang,Limin Zhao,Guina Ren,Zhaozhu Zhang
Solar interface heating evaporators are widely used and have been able to obtain clean water vapor from sewage. However, the soluble contaminants remaining in the original solution were not removed, and the floating organic pollutants affect the steam production rate. In this paper, the superhydrophobic Bi/BiOCl with low surface tension is synthesized and loaded to the felt to construct the floating layer of the photothermal device. The floating layer collaborated with the filter paper hydrophilic layer and the Pyromellitic dianhydride-Tris (4-aminophenyl) amine covalent organic framework (PMDA-TAPA COF) photothermal layer to treat the sewage containing dissolved pollutants, achieving an interfacial evaporation rate of 1.47 kg⋅m −2 ⋅h −1 . Importantly, the floating layer not only has a contact angle of 161°, which can selectively adsorb the organic solvents floating on the water surface, but also can degrade the pollutants dissolved in the water under the light and solving the problems that hinder device applications. The valence band and conduction band potentials of superhydrophobic Bi/BiOCl are at 3.065 eV and −0.435 eV, respectively, which produce h + and O 2 – under light to degrade dissolved pollutants in water. The introduction of novel superhydrophobic Bi/BiOCl photocatalyst in the floating layer provides a reference for solving the problem of pollutant residues.
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CHEMOSPHERE
·
2018
·
IF 4.427
Bo Chen,Sijiang Chen,Huinan Zhao,Yang Liu,Fengxia Long,Xuejun Pan
Ascribing to their significant differences in physicochemical properties , it is extremely challenging to treat complex wastewater containing more than one class of pollutants via one-step treatment. Here, we focused on disposal of complex wastewater bearing organic dye and heavy metal by using adsorptive method. Thus, by combining the advantages of polyethyleneimine (PEI), β-cyclodextrin (β-CD) as well as Fe 3 O 4 magnetic nanoparticles , a versatile β-CD and PEI bi-functionalized magnetic nanoadsorbent (Fe 3 O 4 -PEI/β-CD) with spatially separated sorption sites was successfully constructed for simultaneous capture of methyl orange (MO) and Pb(II) in complex wastewater. In this setting, β-CD cavities and positively charged N-containing groups of PEI were mainly responsible for removal of MO via host-guest inclusion and electrostatic attraction, respectively, and oxygen-bearing groups on the edge of β-CD as well as the free amino moieties in PEI acted as the active sites for Pb(II) uptake. In their individual mono-pollutant system, the adsorption processes can be better described via applying pseudo-second-order kinetic and Langmuir isotherm models. Interestingly, presence of MO in Pb(II)-MO binary system significantly promoted the uptake of Pb(II). But the coexisting Pb(II) had almost no effects on MO uptake. Such results demonstrated that both MO and Pb(II) could be simultaneously and synergistically removed by Fe 3 O 4 -PEI/β-CD through multiple mechanisms (such as electrostatic attraction, host-guest inclusion, chelating, etc.). Particularly, the excellent regeneration and stability make Fe 3 O 4 -PEI/β-CD an ideal integrative adsorbent for purification of actual wastewater contaminated by MO and Pb(II). Thus, this study provides some insights into designing a well-performed and easily recyclable adsorbent for simultaneous and synergetic capture of both organic and inorganic contaminants in complex wastewater.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Han Yang,Jie Zhao,Meijia Qiu,Peng Sun,Dongxue Han,Li Niu,Guofeng Cui
In this work, Pt nanoparticles modified nanoporous AuSn(Pt@NP-AuSn) alloy on Ni buffered flexible carbon fiber paper (CFP) is fabricated by a simple replacement reaction in which NP-AuSn is fabricated by controllable dealloy of electrodeposited Au-Sn alloy films. The as prepared Pt@NP-AuSn/Ni/CFP possesses hierarchical pore structure , high specific surface area and excellent catalytic activity . Due to the bi-functions of both the large surface area of nanoporous metal and macroporous of carbon fiber paper facilitating mass transfer, the Pt@NP-AuSn/Ni/CFP shows high sensitivity of detecting ascorbic acid (AA), dopamine (DA) and uric acid (UA), with sensitivities of 0.14 μA μM −1 cm −2 , 15.23 μA μM −1 cm −2 , 0.28 μA μM −1 cm −2 under the concentration ranging from 200 to 2000 μM, 1–10 μM, and 25–800 μM for AA, DA and UA, respectively. Further, the Pt@NP-AuSn/Ni/CFP possesses long-term stability of sensing AA, DA and UA and presents great anti-interference towards a variety of common compounds in body fluid. All of these results manifest the Pt@NP-AuSn/Ni/CFP can be a promising candidate for the application of the electrochemical sensor for simultaneous detection of AA, DA and UA.
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