Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Guowei Chen,Minghui Qiu,Wei Ke,Xianfu Chen,Yiqun Fan
Membrane technology is an efficient approach for separation of polyvinyl alcohol (PVA)-starch desizing wastewater. However, fouling caused by complex components remains a challenge in industrial-scale applications, leading to reduced flux and frequent chemical cleaning. Here, we utilize PVA components in wastewater to form a self-forming dynamic membrane (SFDM) on substrate surface during filtration, thereby improving the anti-fouling properties of the ceramic membrane as well as its retention performance for small molecule starches generated through decomposition in a high temperature and strong alkali system. We investigated the effects of pore sizes in porous ceramic on starch separation performance and dynamic membrane formation in the simulation system of PVA-starch. In an industrial desizing wastewater treatment system, we verify the stability and reproducibility of SFDM technology. The results demonstrate that ceramic membranes with a pore size of 20 nm are conducive to forming complete SFDMs, resulting in an increase in starch retention from 75.6 % to 99.9 %, while maintaining flux at 59 L·m −2 ·h −1 . The removal rates of COD, TOC and turbidity are 76.2 %, 68.3 % and 99.9 %. SFDMs can form quickly and reduce irreversible fouling on ceramic membranes. The use of ceramic-supported PVA SFDM provides valuable insights for applying ultrafiltration technology to complex wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Siqi Zeng,Zhuoran Ao,Caihong Han,Xiaolong Lin,Shuang Chen,Xinle Xiao,Lijing Yan,Shanqing Zhang,Zhan Lin
Aqueous zinc iodine batteries (AZIBs) offer significant advantages in safety and cost, making them promising candidates for large-scale energy storage. However, the polyiodide shuttle effect impedes their commercialization process, especially when facing high areal capacity conditions (>3 mAh cm −2 ). Designing advanced multifunctional binders emerges as an urgent and efficient tactic to address polyiodide shuttling and sustain the structural integrity and ionic conduction of thick electrodes simultaneously. This work reports a commercially available water-soluble binder with high ionic conductivity and moderate viscosity, polyethylene oxide with a molecular weight of 300,000 (PEO-30), which can chemically adsorb and immobilize iodine species by forming charge-transfer complexes with high electrical conductivity, thereby suppressing the polyiodide shuttling and enhancing reaction kinetics. As a result, the PEO-30 binder-based AZIBs achieve a specific capacity of 208.6 mAh g −1 at 1C under a high mass loading of ∼8.0 mg iodine cm −2 , and maintain an average coulombic efficiency of 99.86% over 3000 cycles. An ultra-stable cycling life is obtained with the capacity retention of 93.81% after 33,000 cycles at 20 C, demonstrating the effectiveness of PEO in immobilizing iodine species and facilitating rate performance of the thick electrodes. The non-toxic and non-irritating nature of the PEO binder provides a new pathway for the practical application of green, low-cost, and practical AZIBs
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Energy & Environmental Science
·
2024
·Vol. 17
·期 12
·4104-4114
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IF 32.4
Yongbin Zhu,Cheng-Gong Han,Jiawei Chen,Lijuan Yang,Yingming Ma,Hongyu Guan,Dongxue Han,Li Niu
Gel-based ionic thermoelectric (i-TE) conversion systems have attracted more attention to harvest energy from ambient waste heat to power sensors in IoT systems, due to their high ionic thermopower, cost-effectiveness, and environmental friendliness. However, their thermoelectric performance, particularly output power density, remains low, hindering their further application. To date, there is still a lack of an effective strategy to reverse this serious situation. Herein, we originally designed an ionic thermoelectric-electrochemical (i-TE-EC) cell by combining two asymmetric gels into a double sandwich structure, resulting in high thermoelectric performance. By tailoring gel compositions, including the concentration and ratio of redox couples as well as additive contents, a maximum output power density Pmax/(ΔT)2 of 10.0 mW m−2 K−2, a cell ionic thermopower of 5.2 mV K−1, and an energy density of 3.4 J m−2 K−2 in two hours were obtained at 313 K for the i-TE-EC cell Gp | G-m/n FeCN4−/3− | Gp | G-x/y I−/I3−-z CF3SO3K | Gp (m/n = 0.175/0.025 M, x/y = 0.10/0.05 M, z = 0.4 M). Moreover, Pmax/(ΔT)2 increased to a higher value of 20.5 mW m−2 K−2 for the i-TE-EC cell using a CEM as a built-in electrode. A gel-device assembled by nine single i-TE-EC cells connected in series generated a voltage of 1.55 V and a high Pmax/(ΔT)2 of 5.2 mW m−2 K−2 at 313 K and ΔT = 5 K. This work provides a promising route for improving the gel-based thermoelectric performance, available for other energy conversion systems.
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Microstructures
·
2025
·Vol. 5
·期 4
·N
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IF 9
Qijiayi Guo,Chao Qiu,Yang Zhang,Jing Li,Zhixiang Chen,Fulong Li,Weifeng Liu,Xinlong Tian,Xiaodong Shi
Zinc-iodine batteries (ZIBs) are considered a promising energy storage system, but are still plagued by low energy density and rampant side reactions originating from active H2O molecules in the liquid electrolyte. Realizing the coupled redox reactions within I-/I0/I+ species, i.e., four-electron transfer reactions, is deemed an effective strategy for boosting the energy density of ZIBs, which is mainly blocked by the rapid hydrolysis of nucleophilic I+ ions. To address these issues, urea with diamine ligand sites (-NH2) was introduced into the liquid electrolyte [urea electrolyte (UE)] to achieve durable four-electron ZIBs. As demonstrated by the spectroscopic characterization results, -NH2 groups can bundle the active H2O molecules by reconfiguring the hydrogen bonds, and provide additional electrophilic ligand sites for I+ ions. Based on these advantages, both the side reactions on the Zn anode and the I+ hydrolysis reaction on the I2@AC cathode are remarkably mitigated, and four-electron transfer is realized at low zinc salt concentrations. As a result, the optimized UE electrolyte effectively stabilizes the zinc metal anode, and endows the I2@AC cathode with a high reversible capacity of 187.2 mAh g-1 after 250 cycles at 1 A g-1. The disclosed intermolecular force modulation strategy in this work will offer a comprehensive perspective for the future design of liquid electrolytes for high-energy-density ZIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Renwu Feng,Qingying Li,Haozhen Dou,Yihan Xie,Jinliang Yan,Mi Xu,Dan Luo,Zhile Yang,Yuanjun Guo,Xinru Wu,Xin Wang,Zhongwei Chen
Aqueous zinc ion batteries (ZIBs) are promising energy storage technologies, but face formidable challenges from hydrogen evolution reaction, dendrite growth, and active material shuttle. However, how to manipulate the electrolyte structure at the nanoscale to boost battery performance remains largely unexplored. Herein, nanodomain electrolytes with structural nano-heterogeneity are developed by introducing α-Dipole Unit as co-solute and through their self-assembly, which enables precise control over ion-transport kinetics and interfacial reversibility of both anode and cathode. The ionized α-dipole units self-aggregate to form clusters induced by the dipole effect, which not only reconstructs hydrogen bond network of electrolyte and realizes the rapid diffusion of Zn 2+ to obtain HER/dendrite-free Zn anode, but also serves as barrier to inhibit the shuttle effect of I 3 − via repulsion-capture synergy mechanism. Remarkably, the Zn symmetric cells can still maintain a satisfactory cycle life at a low temperature of −20 °C, and the capacity retention rate of the assembled Zn I 2 battery is as high as 94.31 % after 13,000 cycles. This pioneering attempt to manipulate electrolyte nanostructure reveals a new dimension in electrolyte design for high-performance batteries.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Chang Liu,Xiaowei An,Peifen Wang,Xuli Ma,Xingfa Li,Xin Chen,Yongguo Li,Xiaogang Hao,Xiaoxu Zhang,Abuliti Abudula,Guoqing Guan
In this study, a highly efficient and cost-effective adsorbent for gaseous iodine, nitrogen-doped KOH-activated coconut shell biochar (NKBC), is presented. A two-step pore expansion assisted by KOH activation process, enhanced by nitrogen doping, created a hierarchical porous structure with ultra-high specific surface area of 2977.90 m 2 /g, large total pore volume of 2.19 cm 3 /g and available micropore volume of 1.17 cm 3 /g, resulting in an iodine adsorption capacity of 6635 mg/g at 75℃ within 3 hours. The low desorption rate (12.93 % at room temperature) highlights the material's stability. Grey relational analysis identified specific surface area and pore structure as key determinants of adsorption capacity, while pore size distribution and nitrogen content significantly influenced desorption. DFT calculations confirmed the enhanced iodine adsorption by nitrogen functionalities and the effectiveness of micro- and narrow mesopores in iodine capture. This sustainable approach offers a significant advancement in developing high-capacity adsorbents for the effective remediation of radioactive iodine.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Chenyu Liu,Hanyu Wu,Yuqing Wang,Lili Li,Jiang Zhou,Jiewei Wu,Peng Lin,Muyi Ni
Iodine is the primary fission product of the lead-cooled fast reactor (LFR) and is often used as an early environmental indicator for severe accidents. Understanding radioactive iodine behavior is crucial for effective radiation hazard control under accident conditions. In this study, the adsorption and deposition mechanisms of iodine (evaporated from lead-bismuth eutectic) onto fused silica and 316 L stainless steel (SS316L) under a dry argon atmosphere were investigated using a high-temperature adsorption testing platform (HATP), which was specifically designed and implemented based on thermochromatography and thermosublimatography. The adsorption enthalpies were determined by Monte Carlo simulations, yielding values of −145 ± 10 kJ/mol and −148 ± 10 kJ/mol (as a peak deposition temperature of 448 ± 11°C and 440 ± 12°C) for fused silica and SS316L, respectively. Further thermodynamic calculations indicated that PbI 2 (g) was the predominant iodine species under experimental conditions. These results provide insights into the chemical speciation and migration of radioactive iodine released from LFR, which is crucial for improving safety assessments and nuclear emergency response strategies.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xinyu Liu,Bo Tang,Yang Gao,Xiaoyan Qi,Fengming Zhao,Zhaoyang Chen,Yinghong Zhu,Huajun Zheng,Youqun Chu
An efficient indirect electrosynthesis method for the preparation of 2,6-dichlorobenzonitrile has been developed, utilizing iodide ions as a redox mediator in the presence of acetate ions. The experimental results demonstrate that the addition of OAc − ions significantly influences the electrochemical behavior of I − ions, primarily through the complexation of OAc − ions with I 2 and I + species. This complexation facilitates the formation of [I 2 OAc] − ions, which are readily oxidized at the anode to generate I + ions. These I + ions are subsequently stabilized by OAc − ions, forming highly electrophilic [IOAc 2 ] − species. This mechanism leads to an enhanced yield of 2,6-dichlorobenzonitrile in the iodide-mediated indirect electrosynthesis reaction. Furthermore, compared to previous systems employing chloride ions, the present method exhibits a higher cyanation yield, indicating that [IOAc₂]⁻ ions possess superior electrophilic activity relative to [ICl₂]⁻ ions, thereby promoting the efficient cyanation of 2,6-dichlorobenzaldehyde. The method also demonstrates broad applicability, achieving good yields with various aromatic aldehydes. These findings highlight the potential of this approach for the synthesis of aromatic nitriles, particularly in the indirect electrosynthesis of nitriles from their corresponding aldehyde precursors. This work provides a promising strategy for the development of sustainable and efficient electrochemical synthesis methods in organic chemistry.
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Journal of Energy Storage
·
2024
·
IF 8.9
Lin Zhou,Na Wang,Yunzhen Chang,Sheng Zhu,Ying Zhang,Wenjing Hou,Yun Zhao,Gaoyi Han
Currently, aqueous rechargeable zinc-iodine (Zn I 2 ) batteries are recognized as promising new energy storage devices due to their significant advantages, including large theoretical capacity, rapid charging and discharging capabilities and high safety. However, the shuttle effect caused by the soluble polyiodide ions leads to low utilization of active iodine and coulombic efficiency (CE). Herein, we use a high-concentration iodine solution as the oxidizing agent to synthesize polypyrrole (PPy/I 2 ) for the first time. Compared with the PPy polymerized by using FeCl 3 as oxidant (PPy/FeCl 3 ), the Zn I 2 battery based on PPy/I 2 cathode demonstrates an extended cycle life (84.2 % after 3800 cycles at 2.0 A g −1 ), high CE (>98 % at 1.0 A g −1 ), and minimal self-discharge (75 % after rest 12 h). The results based on electrochemical testing and characterization indicate that the exceptional performance of PPy/I 2 is primarily attributed to the early insertion of iodine species during the preparation process. This insertion creates reserved space for polyiodide ions, and the positive charge on the main chains of PPy effectively restricts their shuttle during battery operating. Furthermore, due to the ideal shuttle inhibition of PPy/I 2 , the Zn corrosion caused by polyiodide ions is effectively inhibited. The detailed characterizations explore the charge storage mechanism of PPy/I 2 . This research has guiding significance for improving the performance of PPy-based Zn I 2 batteries.
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Carbon Letters
·
2024
·Vol. 34
·期 6
·1723-1736
·
IF 5.5
Liu Huan,Miao Yu,Tian Huayu,Chen Yishan,Wang Enfu,Huang Jingda,Zhang Wenbiao
Moso bamboo, as a kind of renewable functional material, exhibits outstanding development potential. It is promising to prepare activated carbon with good mechanical strength and high specific surface area using moso bamboo as raw material. In this work, we employed a hydraulic extruder to extrude the bamboo charcoal and the adhesive to obtain the moso bamboo activated carbon, and improved the specific surface area of the columnar activated carbon through high-temperature water vapor activation. Through the catalytic role of the water vapor activation process, the formation and expansion of the pores were promoted and the internal pores were greatly increased. The obtained columnar activated carbon shows excellent mechanical strength (93%) and high specific surface area (791.54 m 2 /g). Polyacrylamide@asphalt is one of the most effective adhesives in the high-temperature water vapor activation. The average pore size (22.99 nm) and pore volume (0.36 cm 3 /g) of the prepared columnar activated carbon showed a high mesoporous ratio (83%). Based on the excellent pore structure brought by the activation process, the adsorption capacity of iodine (1135.75 mg/g), methylene blue (230 mg/g) and carbon tetrachloride (64.03 mg/g) were greatly improved. The resultant moso bamboo columnar activated carbon with high specific surface area, excellent mechanical properties, and outstanding adsorption capacity possesses a wide range of industrial applications and environmental protection potential.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Shuangping Xu,Juncheng Ma,Hongge Jia,Mingyu Zhang,Yanqing Qu,Chengbao Geng,Xiaozhou Zhao,Min Shao,Jingyu Xu,Xing Wang
Lignin-based porous carbon, a derivative of lignin, is acknowledged for its cost-effectiveness, stability, and environmental sustainability. It exhibits significant adsorption capacity for the removal of heavy metals and in wastewater treatment, rendering it a highly esteemed adsorbent material. However, the potential of lignin-derived porous carbon for the capture of iodine in environmental contexts has yet to be thoroughly investigated. This research aims to examine the iodine capture capabilities of lignin-derived porous carbon in both iodine vapor and iodine/cyclohexane solution. Initially, lignin derivatives (ADL) (Mn = 2.85 × 10 4 , Mw / Mn = 1. 73) were synthesized through the graft copolymerization of lignin (Mn ≈ 2500), 4-acetoxystyrene, and dienopropyl terephthalate in ethylene glycol, utilizing azobisisobutyronitrile (AIBN) as the initiator. Subsequently, ADL was transformed into layered lignin-based porous carbon (ADLC) by one-step carbonization and zinc chloride activation. The iodine adsorption capacity of ADLC was determined to be 2340 mg/g in an iodine vapor environment and 354 mg/g in a 500 mg/L iodine/cyclohexane solution. These findings indicate that the layered porous carbon (ADLC) derived from lignin represents a promising material for iodine capture, providing an economical, stable, and environmentally friendly approach to nuclear waste management.
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Energy Storage Materials
·
2025
·
IF 20.2
Lijun Tang,Jian Gao,Jia Xu,Changxiang Shao,Tiansheng Mu,Xiaodong Zhu
The practical applications of aqueous Zn-I 2 batteries are severely hindered by the uncontrolled shutting of polyiodide ions and rampant side reactions. Herein, we integrate coordination-driven monodisperse liquid metal (LM) nanodroplets into a sulfonate-rich polyanionic hydrogel matrix (p(AMPS-AA)) to fabricate a bifunctional gel electrolyte (LM-AP) capable of simultaneously suppressing Zn dendrite growth and polyiodide shuttle effect. Mechanistically, the dynamic hydrogen bond network of the hydrogel and the fluidity of LM nanodroplets synergistically endow the electrolyte with self-adaptive deformation capability, maintaining intimate electrode-electrolyte contact to suppress hydrogen evolution reaction (HER) and dendrite growth. Meanwhile, the electrostatic repulsion of sulfonate ( − SO 3 − ) anionic chains and chemical adsorption of LM nanodroplets jointly block polyiodide shuttling. Consequently, this polyanionic hydrogel electrolyte demonstrates exceptional stability in a symmetrical Zn//Zn cell, maintaining high cycling stability over 3500 h at 0.5 mA cm −2 and 0.5 mAh cm −2 . And the Zn-I 2 batteries with LM-AP electrolyte achieve a high Coulombic efficiency (CE) (∼100%) and exceptionally long cycling stability (85,000 cycles) at a high current density of 20 A g −1 . The high-loading pouch battery maintains a capacity retention rate of 99% after 350 cycles and demonstrated excellent flexibility and safety. This design provides a brand-new idea for solving the problem of multi-interface coupling failure of Zn-I 2 batteries.
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