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Hydrogels for the removal of the methylene blue dye from wastewater: a review

ENVIRONMENTAL CHEMISTRY LETTERS 2022年第4期20卷 2665-2685页

作者： Yang, Yinchuan Zhu, Qinlin peng, xuwen Sun, Jingjing Li, Cong Zhang, Xinmiao Zhang, Hao Chen, Jiabin Zhou, Xuefei Zeng, Hongbo Zhang, Yalei Tongji Univ Coll Environm Sci & Engn State Key Lab Pollut Control & Resources Reuse Shanghai 200092 Peoples R China Tongji Univ Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G IH9 Canada Univ Shanghai Sci & Technol Coll Environm & Architecture Shanghai 200093 Peoples R China Sinopec Beijing Res Inst Chem Ind Environm Protect Res Inst Beijing 100013 Peoples R China

Water pollution is a major environmental issue with the rapid development of industry. Therefore, advanced technologies and materials are needed to remove pollutants from contaminated waters. The adsorption process displays many advantages such as high adaptability and removal efficiency for water sources of varying quality. Hydrogels have recently attracted attention due to their high adsorption capacity and structural stability, yet several issues remain to be explored, such as the number of reuse and engineering applications. Here, we review hydrogels for the removal of methylene blue from wastewater, with focus on hydrogel preparation and properties, adsorption performance and mechanisms, reusability and comparison with biological and chemical oxidation methods.

关键词： Hydrogel Methylene blue Adsorption Dye Wastewater treatment

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Green synthesis of Pd truncated octahedrons using of firmiana simplex leaf extract and their catalytic study for electro-oxidation of methanol and reduction of p-nitrophenol

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APPLIED ORGANOMETALLIC CHEMISTRY 2019年第8期33卷 e5045-e5045页

作者： peng, xuwen Bai, Xuefeng Cui, Zelin Liu, Xuhui Heilongjiang Univ Sch Chem & Mat Sci Harbin 150080 Heilongjiang Peoples R China Heilongjiang Acad Sci Inst Petrochem Harbin 150040 Heilongjiang Peoples R China

A facile and eco-friendly biosynthetic route for preparing Pd truncated octahedrons (PdTOs) using firmiana simplex leaf extract was reported without any chemical reducing agents. The information of reducing components, reduction process and time were obtained by ATR-FTIR imaging, FTIR and UV-Vis spectroscopy, respectively. TEM image revealed that more than 75% of PdNPs were composed of PdTOs with an average diameter of 9.2 nm. HR-TEM analysis demonstrated that a single PdTO consisted of the mix of {100} and {111} crystal planes. SAED and XRD pattern confirmed the well crystalline nature of fcc structured PdTOs. The model reactions of electro-oxidation of methanol and reduction of p-nitrophenol (p-NP) were adopted to explore the effects of structure and size of PdNPs on the catalytic properties. In the electro-oxidation of methanol, the forward-scan peak current density (If) of PdTOs was 10.05 mA cm-2, 6.3 times and 1.9 times of PdNPs-0 and PdNPs-4:1, illustrating its superior electro-catalytic property to that of spherical PdNPs. In the p-NP reduction reaction, the apparent rate constant (Ka) over PdTOs was 0.358 min-1, higher than spherical PdNPs-0 (0.08 min-1) with the similar particle size and lower than the same spherical PdNPs-4:1 (0.562 min-1) and commercial Pd/C (0.415 min-1), which all about half the size of PdTOs. It has been demonstrated that electro-chemical oxidation of methanol was a structure-sensitive reaction, while the reduction of p-NP was mainly dependent on the particle size of PdNPs.

关键词： bio-synthesis electro-oxidation of methanol firmiana simplex leaf extract Pd truncated octahedrons reduction of p-nitrophenol

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Assessment of pharmacological effects and abuse potential of 5F-EDMB-PICA, CUMYL-PEGACLONE, and NM-2201 in mice

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PSYCHOPHARMACOLOGY 2025年第3期242卷 533-544页

作者： Li, Kaixi Xu, Deli Qiao, Yanling Kuai, Lixin Luo, xuwen Di, Bin Xu, peng China Pharmaceut Univ Sch Pharm Nanjing 210009 Peoples R China Off China Natl Narcot Control Commiss Pharmaceut Univ Joint Lab Key Technol Narcot Contr Beijing 100193 Peoples R China Minist Publ Secur Drug Intelligence & Forens Ctr Key Lab Drug Monitoring & Control Beijing 100193 Peoples R China

Rationale The newly emerging synthetic cannabinoids (SCs) 5F-EDMB-PICA, CUMYL-PEGACLONE, and NM-2201 have been observed to produce effects by activating cannabinoid type 1 (CB1) receptors. Nevertheless, the pharmacological effects and potential for abuse of these three substances remain to be studied. These substances have yet to be regulated in many countries. Objectives We investigated the safety, pharmacological effects, rewarding effects, and cannabinoid withdrawal of 5F-EDMB-PICA, CUMYL-PEGACLONE, and NM-2201. Methods This study evaluated the drug safety and the cannabinoid-specific pharmacological effects of the three substances through acute toxicity experiments (in which the LD50 of each substance was obtained) and tetrad experiments (comprising assessments of hypothermia, analgesia, locomotion inhibition, and catalepsy). Furthermore, the conditioned place preference (CPP) experiments and withdrawal experiments were conducted to evaluate the rewarding effect and cannabinoid withdrawal potential of the substances in question. Results The results demonstrated that all three drugs exhibited certain acute toxic effects and could potentially induce tetrad effects. The data were analyzed using non-linear regression, and the corresponding ED50 values and 95% confidence intervals (CI) were obtained. The rank order of potency was determined to be CUMYL-PEGACLONE > 5F-EDMB-PICA > NM-2201. In the CPP experiments, it was demonstrated that 5F-EDMB-PICA significantly induced an increase in CPP score at a dose of 0.3 mg/kg, while NM-2201 caused an increase in CPP score and a significant aversion effect at a dose of 2 and 3 mg/kg, respectively. It is noteworthy that all three types of SCs were observed to produce a significant biphasic effect, indicating that CPP scores were biphasic for all compounds. Following the administration of the CB1 receptor antagonist rimonabant, a notable increase in head twitches and paw tremors was observed, indicating that these three SCs indu

关键词： 5F-EDMB-PICA CUMYL-PEGACLONE NM-2201 Acute toxicity Tetrad effects CPP Withdrawal

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Origin of complex behaviour of spatially discordant alternans in a transgenic rabbit model of type 2 long QT syndrome

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JOURNAL OF PHYSIOLOGY-LONDON 2009年第19期587卷 4661-4680页

作者： Ziv, Ohad Morales, Eduardo Song, Yoon-kyu peng, xuwen Odening, Katja E. Buxton, Alfred E. Karma, Alain Koren, Gideon Choi, Bum-Rak Brown Univ Warren Alpert Med Sch Rhode Isl Hosp Div CardiolCardiovasc Res Ctr Providence RI 02903 USA Brown Univ Div Engn Providence RI 02903 USA Penn State Univ Coll Med Dept Comparat Med Hershey PA USA Northeastern Univ Dept Phys Boston MA 02115 USA

Enhanced dispersion of repolarization has been proposed as an important mechanism in long QT related arrhythmias. Dispersion can be dynamic and can be augmented with the occurrence of spatially out-of-phase action potential duration (APD) alternans (discordant alternans;DA). We investigated the role of tissue heterogeneity in generating DA using a novel transgenic rabbit model of type 2 long QT syndrome (LQT2). Littermate control (LMC) and LQT2 rabbit hearts (n = 5 for each) were retrogradely perfused and action potentials were mapped from the epicardial surface using di-4-ANEPPS and a high speed CMOS camera. Spatial dispersion (delta APD and delta slope of APD restitution) were both increased in LQT2 compared to LMC (delta APD: 34 +/- 7 ms vs. 23 +/- 6 ms;delta slope:1.14 +/- 0.23 vs. 0.59 +/- 0.19). Onset of DA under a ramp stimulation protocol was seen at longer pacing cycle length (CL) in LQT2 compared to LMC hearts (206 +/- 24 ms vs. 156 +/- 5 ms). Nodal lines between regions with APD alternans out of phase from each other were correlated with conduction velocity (CV) alternation in LMC but not in LQT2 hearts. In LQT2 hearts, larger APD dispersion was associated with onset of DA at longer pacing CL. At shorter CLs, closer to ventricular fibrillation induction (VF), nodal lines in LQT2 (n = 2 out of 5) showed persistent complex beat-to-beat changes in nodal line formation of DA associated with competing contribution from CV restitution and tissue spatial heterogeneity, increasing vulnerability to conduction block. In conclusion, tissue heterogeneity plays a significant role in providing substrate for ventricular arrhythmia in LQT2 rabbits by facilitating DA onset and contributing to unstable nodal lines prone to reentry formation.

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Recent advances in coacervation and underlying noncovalent molecular interaction mechanisms

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PROGRESS IN POLYMER SCIENCE 2024年 153卷

作者： peng, Qiongyao Wang, Tao Yang, Diling peng, xuwen Zhang, Hao Zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G1H9 Canada

Coacervation is a liquid-liquid phase separation phenomenon. It involves the formation of a dense coacervate phase, rich in concentrated materials, and a co-existing immiscible dilute supernatant. This phenomenon can occur either from a homogeneous aqueous solution (simple coacervation) or when two different macromolecular aqueous solutions (proteins, polymers, and colloids) are brought into contact (complex coacervation). Coacervation has historical significance as it may have played a role in the origin of life, concentrating nutritious materials through liquid-liquid phase separation. It also reveals the underlying mechanisms of many biological phenomena such as intracellular biomolecular condensates, extracellular matrices, squid beak's gradient properties, sessile organism's wet adhesion, Alzheimer's diseases, and more. Coacervation provides insights and inspires promising solutions in areas like artificial cells/tissues, gradient materials, gene/drug delivery, underwater adhesives, and beyond. The driving forces of coacervation are noncovalent molecular interactions, often referred to as 'chemistry beyond the molecule', including hydrophobic interaction, electrostatic interaction, hydrogen-bonding interaction, cation- zr interaction, zr - zr interaction, multivalency, etc. In this work, we have systematically reviewed the underlying noncovalent molecular interactions of simple coacervation and complex coacervation, respectively. We summarize commonly used materials and their corresponding molecular structures, dis cussing their applications. Some remaining challenge issues and perspectives for future studies are also presented. Understanding the underlying noncovalent molecular interactions of coacervation, alongside insights into molecular compositions and structures, can better guide the design of novel materials, elucidate various biological phenomena, and contribute to the development and optimization of relevant engineering technologies. (c) 2024 The Auth

关键词： Simple coacervation Complex coacervation Noncovalent molecular interactions Liquid-liquid phase separation LLPS

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Comparative analysis of three heating methods for natural gas hydrate production: Electric heating, steam injection, and hot water injection

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APPLIED THERMAL ENGINEERING 2025年 269卷

作者： Zhang, Zhaobin Xu, Tao Li, Shouding Guo, peng Li, Xiao Lu, Cheng Sun, Yiming Wang, Pingkang Qin, xuwen Chinese Acad Sci Inst Geol & Geophys Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China China Geol Survey China Aero Geophys Survey & Remote Sensing Ctr Nat Beijing 100083 Peoples R China Minist Nat Resources China Geol Survey Oil & Gas Resources Survey Beijing 100083 Peoples R China Natl Engn Res Ctr Gas Hydrate Explorat & Dev Guangzhou 510075 Guangdong Peoples R China

Natural gas hydrates are a promising and environmentally sustainable energy resource, but their commercial production remains challenging. External heating is crucial for improving production efficiency. In this study, we employed a self-developed simulator (IGG-hydrate) to compare the thermal performance of three key heating methods: electric heating (EH), steam injection (SI), and hot water injection (WI). Quantitative indicators, including heating and depressurization thresholds, were introduced to assess the effectiveness of each method. The results demonstrate that external heating significantly facilitates hydrate dissociation, with electric heating and steam injection showing comparable gas production rates and early-stage efficiency. However, both electric heating and steam injection methods can cause localized overheating near injection wells, leading to energy inefficiency. In contrast, hot water injection achieves a more uniform temperature distribution and a broader heating range, while avoiding excessive temperature rise. However, it also reduces depressurization efficiency and increases subsidence near the wells. To optimize performance, we propose a steam-water alternating injection strategy: steam is injected initially for rapid dissociation near the wells, followed by hot water injection to extend the heating range and maintain thermal efficiency with the same equipment.

关键词： Heating method Electric heating Steam injection Hot water injection Hydrate

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Estradiol promotes sudden cardiac death in transgenic long QT type 2 rabbits while progesterone is protective

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HEART RHYTHM 2012年第5期9卷 823-832页

作者： Odening, Katja E. Choi, Bum-Rak Liu, Gong Xin Hartmann, Kathryn Ziv, Ohad Chaves, Leonard Schofield, Lorraine Centracchio, Jason Zehender, Manfred peng, xuwen Brunner, Michael Koren, Gideon Brown Univ Rhode Isl Hosp Div Cardiol Cardiovasc Res CtrAlpert Med Sch Providence RI 02903 USA Univ Hosp Freiburg Dept Cardiol Freiburg Germany Penn State Univ Coll Med Dept Comparat Med Hershey PA USA

BACKGROUND Postpubertal women with inherited long QT syndrome type 2 (LQT2) are at increased risk for polymorphic ventricular tachycardia (pVT) and sudden cardiac death (SCD), particularly during the postpartum period. OBJECTIVE To investigate whether sex hormones directly modulate the arrhythmogenic risk in LQTS. METHODS Prepubertal ovariectomized transgenic LQT2 rabbits were treated with estradiol (EST), progesterone (PROG), dihydrotestosterone (DHT), or placebo (OVX). RESULTS During 8 weeks of treatment, major cardiac events-spontaneous pVT or SCD-occurred in 5 of the 7 EST rabbits and in 2 of the 9 OVX rabbits (P < .05);in contrast, no events occurred in 9 PROG rabbits and 6 DHT rabbits (P < .01 vs PROG;P < .05 vs DHT). Moreover, EST increased the incidence of pVT (P < .05 vs OVX), while PROG reduced premature ventricular contractions, bigeminy, couplets, triplets, and pVT (P < .01 vs OVX;P < .001 vs EST). In vivo electrocardiographic monitoring, in vivo electrophysiological studies, and ex vivo optical mapping studies revealed that EST promoted SCD by steepening the QT/RR slope (P < .05), by prolonging cardiac refractoriness (P < .05), and by altering the spatial pattern of action potential duration dispersion. Isoproterenol-induced Ca2+ oscillations resulted in early afterdepolarizations in EST-treated hearts (4 of 4), while PROG prevented SCD by eliminating this early afterdepolarization formation in 4 of the 7 hearts (P = .058 vs EST;P < .05 vs OVX). Analyses of ion currents demonstrated that EST increased the density of I-Ca,I-L as compared with OVX (P < .05) while PROG decreased it (P < .05). CONCLUSION This study reveals the proarrhythmic effect of EST and the antiarrhythmic effect of PROG in LQT2 in vivo, outlining a new potential antiarrhythmic therapy for LQTS. KEYWORDS Long QT syndrome;Sex hormones;Arrhythmogenesis;Sudden cardiac death;Transgenic LQT2 rabbit model;Cardiac ion currents;Early afterdepolarization;In vivo electrophysiological study

关键词： Long QT syndrome Sex hormones Arrhythmogenesis Sudden cardiac death Transgenic LQT2 rabbit model Cardiac ion currents Early afterdepolarization In vivo electrophysiological study

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Long-peptide therapeutic vaccination against CRPV-induced papillomas in HLA-A2.1 transgenic rabbits

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Trials in Vaccinology 2014年第1期3卷 134-142页

作者： Hu, Jiafen Budgeon, Lynn R. Balogh, Karla K. peng, xuwen Cladel, Nancy M. Christensen, Neil D. Jake Gittlen Cancer Research Foundation Pennsylvania State University College of Medicine Hershey PA 17033 United States Department of Pathology Pennsylvania State University College of Medicine Hershey PA 17033 United States Department of Comparative Medicine Pennsylvania State University College of Medicine Hershey PA 17033 United States Microbiology and Immunology Pennsylvania State University College of Medicine Hershey PA 17033 United States

Long peptide immunization is a promising strategy to clear established tumors. In the current study, we investigated the therapeutic effect of a naturally existing long peptide that contained two HLA-A2.1 restricted epitopes (CRPVE1/149-157 and CRPVE1/161-169) from cottontail rabbit papillomavirus (CRPV) E1 using our CRPV/HLA-A2.1 transgenic rabbit model. A universal Tetanus Toxin helper motif (TT helper) was tagged at either the N-terminus or the carboxyl-terminus of this long peptide and designated as TT-E1 peptide and E1 peptide-TT, respectively. Four groups of HLA-A2.1 transgenic rabbits were infected with wild type CRPV DNA. Three weeks post-infection, the rabbits were immunized four times with TT-E1 peptide, E1 peptide only, E1 peptide-TT or TT-control peptide with two-week intervals between immunizations. Tumor outgrowth was monitored and recorded weekly. After the third booster immunization, tumors on two of the four E1 peptide-TT immunized rabbits began to shrink. One animal from this group was free of tumors at the termination of the study. The mean papilloma size of E1 peptide-TT immunized rabbits was significantly smaller when compared with that of the three other groups (P < 0.05, one way ANOVA analysis). It is interesting that E1 peptide-TT vaccination not only stimulated stronger T cell mediated immune responses but also stronger antibody generations. We conclude that the location of a TT helper motif tagged at the long peptide vaccine is critical for the outcome of therapeutic responses to persistent tumors in our HLA-A2.1 transgenic rabbit model. © 2014 The Authors. Published by Elsevier Ltd.

关键词： CRPV HLA-A2.1 Long peptide T-cell mediated immune response Therapeutic vaccine Transgenic rabbit

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Controlled Anodic Decomposition Pathway of Supramolecular Lithium Borate for Rationally Tuned Interphase Chemistry

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Angewandte Chemie 2025年

作者： Haiyu Zhou Wenhui Hou Da Zhu Pan Zhou xuwen peng Zhi Liu Shuaishuai Yan Yang Lu Yu Ou Fengxiang Liu Yingchun Xia Hao Liu Qingbin Cao Xuan Song Decai Guo Hong Xu Kai Liu The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 P.R. China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 P.R. China Dalian Research Institute of Petroleum and Petrochemicals SINOPEC No.96 Nankai Road Tieshan Street Lvshunkou District Dalian Liaoning 116045 P.R. China

The rational tailoring and molecular-level engineering of stable cathode-electrolyte interphases (CEIs) is paramount to advancing the performance of next-generation high-energy, layered nickel-rich oxide-based lithium metal batteries. However, developing well-tailored electrolyte additives with rationally controlled interfacial chemistry remains highly challenging. Here, two lithium borates: lithium (2-methoxy-15-crown-5)trifluoroborate (C-LiMCFB) and lithium (15-methoxy-2,5,8,11,14-pentaoxahexadecan)trifluoroborate (L-LiMCFB), incorporating cyclic 15-crown-5 (15C5) and linear pentaethylene glycol monomethyl ether (PEGME) as respective host groups tethered to the boron center are designed and synthesized. In C-LiMCFB, the supramolecular polydentate chelation/de-chelation of the 15C5 with Li + can sequentially deactivate/activate the anodic decomposition of the C─O bonds, therefore leading to the controlled cleavage pathway of B─O and C─O bonds. The controlled interfacial chemistry leads to the formation of a uniform CEI layer, rich in lithium boron–oxygen clusters interwoven with LiF, on the NCM811 surface. This novel CEI configuration demonstrates an exceptional balance of mechanical robustness, adhesiveness, and toughness, providing highly desirable protection for the NCM811 cathode. The discovery of these novel supramolecular boron-based lithium salts not only unlocks supramolecular chemistry for rational electrolyte tuning but also provides a deeper understanding of the CEI formation mechanism in high-energy lithium metal batteries.

关键词： Battery electrolytes Energy storage Lithium metal batteries Supramolecular chemistry

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Strong and Specific Protective and Therapeutic Immunity Induced by Single HLA-A2.1 Restricted Epitope DNA Vaccine in Rabbits

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Procedia in Vaccinology 2009年第1期1卷 4-14页

作者： Hu, Jiafen Schell, Todd D. peng, xuwen Cladel, Nancy M. Balogh, Karla K. Christensen, Neil D. Jake Gittlen Cancer Research Foundation Pennsylvania State University College of Medicine Hershey PA 17033 United States Department of Pathology Pennsylvania State University College of Medicine Hershey PA 17033 United States Department of Microbiology and Immunology Pennsylvania State University College of Medicine Hershey PA 17033 United States Department of Comparative Medicine Pennsylvania State University College of Medicine Hershey PA 17033 United States

An HLA-A2.1 transgenic rabbit /Cottontail rabbit papillomavirus (CRPV) infection model has been reported previously. In this study, we incorporated online MHCI epitope prediction software and HLA-A2.1 transgenic mouse and rabbit systems together to demonstrate an efficient way to identify and test immunogenicity of two HLA-A2.1 restricted epitopes from CRPVE1 (161-169 LLFRQAHSV and 303-311 MLQEKPFQL). Both epitopes were able to induce specific cytotoxic CD8 T cells in HLA-A2.1 mice and rabbits after peptide and DNA immunization and in vitro stimulation respectively. Using an epitope DNA vaccination method, we achieved partial and complete protection against CRPV DNA challenge by CRPVE1/161-169 and CRPVE1/303-311 respectively in HLA-A2.1 transgenic outbred rabbits. CRPVE1/303-311 also showed strong and specific therapeutic effects in CRPV-infected HLA-A2.1 transgenic outbred rabbits. Interestingly, epitope CRPVE1/303-311 (but not E1/161-169) showed strong protective immunity in non-transgenic EIII/JC inbred (but not outbred) NZW rabbits. Our data demonstrates an efficient way to identify HLA-A2.1 restricted epitopes for the development of prophylactic and therapeutic vaccines. © 2009.

关键词： A2 CRPV Epitope DNA vaccine Transgenic mouse Transgenic rabbit

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