CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Qi Wu,Hui He,Hang Zhou,Fei Xue,Hongxiang Zhu,Shile Zhou,Lei Wang,Shuangfei Wang
A novel multiple active sites cellulose-based adsorbent (MCC/TEPAA-BCTTC) with a high density of multiple active adsorption sites (N, O, S) was prepared by using epichlorohydrin cross-linking microcrystalline cellulose (MCC) with tetraethylenepentamine (TEPA), followed by grafting with bis(carboxymethyl) trithiocarbonate (BCTTC). It was shown that the removal rates of MCC/TEPAA-BCTTC for Pb(II) (1 mg/L), Cu(II) (3 mg/L) and Cr(VI) (1 mg/L) reached 100 %, 98 % and 99 %, respectively, and the remaining concentration after adsorption reached the United States Environmental Protection Agency (US EPA) standards for Pb(II) and Cu(II) and the China integrated wastewater discharge standard for Cr(VI). These results indicate that the high removal rate of MCC/TEPAA-BCTTC for removing anionic and cationic heavy metal ions in low-concentration mixed heavy metal ions environments was mainly due to the high density of multiple adsorption sites that act via multiple cooperative mechanisms.
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JOURNAL OF HAZARDOUS MATERIALS
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2026
·
IF 10.6
Dingqiang Zhang,Xiaoqun Wu,Tengchao Jiao,Weizhen Zhang,Jiahao He,Yanhua Xie,Yingming Hu,Yao Wei
Trace-Cu(II)/CaO 2 /PAC achieves > 95% algal removal in natural waters. • Pre-oxidation degrades algal extracellular matter to aid coagulation. • PAC mitigates matrix interference, indirectly maintaining oxidation. • Intracellular ROS induces functional death without severe lysis. Harmful algal blooms release microcystins and other metabolites that threaten aquatic ecosystems and human health. Conventional removal methods often induce cell lysis and are affected by matrix interference in natural waters, limiting their practical applicability. A sequential process coupling trace-Cu(II)/CaO 2 pre-oxidation with PAC coagulation was developed for efficient algal removal. The system removed 98.5% of M. aeruginosa from lake water. During the 10-min pre-oxidation stage, trace-Cu(II)/CaO 2 effectively degraded extracellular microcystin-LR (MC-LR) and the dissolved organic matter (DOM) surrounding algal cells, thereby weakening electrostatic repulsion and enhancing coagulation efficiency. The coupled process generated Cu(III), •OH, •O 2 − , and 1 O 2 within the cells, which led to functional cell death without severe membrane rupture. Conventional molecular dynamics (MD) simulations confirmed the stability of a representative pentameric cation-channel model, and steered molecular dynamics (SMD) further showed that Cu 2+ and H 2 O 2 could be guided through its pore under an applied axial bias, supporting the physical plausibility of channel-mediated intracellular access. Mechanistically, OH − generated during CaO 2 hydrolysis promoted the Cu(II)/Cu(I)/Cu(III) catalytic cycle and sustained reactive species production, with Cu(III) as the dominant contributor to functional inactivation (68.5%). These findings establish an innovative and practical strategy for the safe and effective removal of algae from contaminated natural waters. Download: Download high-res image (297KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Xianhong Deng,Wenbin Wu,Shuangqin Tian,Yi He,Shujie Wang,Bifang Zheng,Kai Xin,Ziqin Zhou,Lihong Tang
In this study, we employed a straightforward in-situ synthesis strategy to fabricate multi-site adsorption functional composites known as aminated chitosan@ZIF-8 (AmCs@ZIF-8) for the efficient removal of Cu(II) and Congo red. The AmCs@ZIF-8 adsorbed Cu(II) at pH 5 and Congo red at pH 3 with excellent removal efficiency values of 94 % and 100 % respectively. The maximum adsorption capacity for Cu(II) and Congo red are obtained as 785 mg g −1 and 1156 mg g −1 , respectively. Interestingly, AmCs@ZIF-8 composites exhibited an excellent removal efficiency (>80 %) after reusing them for four sequential cycles. Analysis of the adsorption isotherm and kinetic data indicated that chemisorption primarily governed the adsorption of Cu(II) and Congo red by AmCs@ZIF-8. Furthermore, we elucidated the adsorption energy of Cu(II) and Congo red on the AmCs@ZIF-8 composite through density functional theory. Specifically, the adsorption energy values for Cu(II) with AmCs and ZIF-8 were −20.907 and −57.809 kcal·mol −1 , and −26.514 and −16.242 kcal·mol −1 for Congo red, respectively. The efficient adsorption mechanism of Cu(II) and Congo red on the AmCs@ZIF-8 composite can be attributed to the synergistic effects of chelation, electrostatic attraction, ion exchange, and hydrogen bonding through the analysis of experimental characterization and theoretical calculation. Therefore, AmCs@ZIF-8 composites elevate the adsorption capacity of Cu(II) and Congo red in a single-component system and exhibit high removal efficiency (>90 %) in the context of the Cu(II)-Congo red binary system.
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FUEL
·
2023
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IF 7.4
Mengxia Qing,Wenbin Liu,Liang Liu,Sibiao Huang,Zihang He,Yanshan Yin,Jun Xiang
Enhancing biochar's adsorption and solidification performance in compound-polluted aqueous solutions remains a crucial task for achieving the cost-effective removal of heavy metals from water bodies. The study examined the removal performances and mechanisms of Cu(II) and Cr(III) using biochar prepared from food waste at temperatures of 350 °C, 450 °C, and 550 °C (FWB-350, FWB-450, and FWB-550). FWB-450 exhibited the highest overall effectiveness in adsorbing Cu(II) and Cr(III), demonstrating the adsorption capacity (Q e ) of 40.283 and 21.456 mg/g in single-solution, respectively. Thermodynamic parameters indicate that the adsorption process involves physical and chemical reactions involving heat absorption. The impact of Cr(III) on the adsorption of Cu(II) is more apparent in the mixed competitive system. The pH, the oxygen-functional groups and carbonate ion quantity of FWB are crucial in improving Cu(II) and Cr(III) adsorption by affect the hydrolysis, complexation, and ion exchange processes. The presence of alkaline earth metal ions in FWB, like Ca(II), aids in the elimination of Cu(II) and Cr(III) through ionic precipitation and ion exchange, correspondingly. Furthermore, FWB adsorbed with Cu(II) and Cr(III) is relatively less hazardous than solid waste. The study validates the resource utilization of FW and its potential application of biochar in heavy metal adsorption.
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TALANTA
·
2023
·
IF 6.1
Qing Li,Yu-Meng Guo,Xiang-Yi He,Guang-Li Li
The reliable and accurate detection of glyphosate is urgently demanded because it is related to food and environmental safety. In this contribution, a PDA-PEI/Cu 2+ complex that possesses peroxidase-mimetic activity and stimulus-responsive fluorescence was fabricated by coordinating Cu 2+ with polydopamine-polyethyleneimine copolymer dots (PDA-PEI CPDs). With the introduction of Cu 2+ , the fluorescence intensity of PDA-PEI CPDs dropped sharply owing to the electron transfer effect. As a peroxidase-mimicking nanozyme , the PDA-PEI/Cu 2+ complex owns catalytic capacity to oxidize the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into blue oxTMB, leading a further fluorescence quenching by internal filtering effect by oxTMB. Once the glyphosate participated, the fluorescence signal of PDA-PEI CPDs is recovered significantly because of the formation of more stable Glyp-Cu 2+ complexes, meanwhile the peroxidase-mimicking activity of PDA-PEI/Cu 2+ complex could be strongly hindered. According to this principle, a novel and extremely convenient ‘turn off’ colorimetric and ‘turn on’ fluorescence sensing platform can be established for dual-mode detection of glyphosate. The favorable sensitivity and selectivity and were verified in the analysis of glyphosate in the environment through the marriage of dual-signal sensing platform. The detection limit of the dual-mode glyphosate sensing platform was 103.82 ng/mL for colorimetric assay and 16.87 ng/mL for fluorescent assay, respectively. Satisfactory recoveries in the range of 96.40%–104.66% were obtained, indicating the potential of this method for application in complicated real sample. Thereby, this strategy broadens the applications of polydopamine nanomaterials and holds a promising application in determination of pesticide residues .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ying Sun,Bo-Yu Peng,Yuan Wang,Xuejiang Wang,Siqing Xia,Jianfu Zhao
The environmental risks associated with microplastics from biodegradable plastics are an emerging concern, but the roles of biofilm formation and biodegradation in the environmental behaviors of biodegradable microplastics have not been clarified. Here, we investigated the adsorption and desorption performance of Cu(II) on the poly(butylene adipate- co -terephthalate) (PBAT) microplastics and explored the roles of biofilms and biodegradation during the adsorption. The maximum adsorption quantities of Cu(II) by the pristine PBAT, the biofilm-covered PBAT, and the biodegraded PBAT were 140.547 µg·g −1 , 192.197 µg·g −1 , and 172.065 µg·g −1 , respectively. The biodegradation increased the Cu(II) adsorption on the PBAT by 24.43%, which was due to the changes in physicochemical properties (e.g., a high surface area to volume ratio, high crystallinity, and more oxygenated groups). The surface of PBAT covered by biofilm contained oxygen- and nitrogen-containing functional groups, which could complex with more Cu(II), thus making the promoting effect of biofilm on adsorption stronger than that of biodegradation. The adsorbed Cu(II) on the surface of the biodegraded PBAT had a remarkable desorption hysteresis and was less impacted by the presence of FA, indicating that PBAT after biodegradation could transport the adsorbed heavy metals over long distances, which was not observed on the biofilm-covered PBAT. Our findings highlight the critical effects of plastic degradation on the environmental behaviors of petro-based microplastics, which helps assess the environmental fate of biodegradable microplastics in aquatic systems.
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BIORESOURCE TECHNOLOGY
·
2019
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IF 6.669
Jianhong Ma,Tong Li,Yutang Liu,Tao Cai,Yuanfeng Wei,Wanyue Dong,Hui Chen
In this study, lignin extracted from rice husk was used to synthesis double network hydrogel adsorbent, named RH-CTS/PAM gel. RH-CTS/PAM gel exhibited macroporous structure and high buried water content, which gave rise to the exceptional adsorption performance. As results, in individual systems, the equilibrium time of Pb(II), Cu(II) and Cd(II) with initial concentration of 200 mg/L could be reached within 10 min, with the theoretical maximum adsorption capacity of 374.32, 196.68 and 268.98 mg/g, respectively. The adsorption rate and capacity of Pb(II), Cu(II) and Cd(II) in multicomponent systems were lower than that of individual systems. However, in a few cases of ternary system, higher adsorption rate and capacity was observed compare to binary systems. Adsorption mechanism indicated that both oxygen-containing and nitrogen-containing functional groups played a dominant role during the adsorption process, and mainly through chemical interaction along with a small amount of physical interaction.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2017
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IF 4.421
Hengjia Zhu,Jianming Pan,Jun Cao,Yue Ma,Fengxian Qiu,Wenli Zhang,Yongsheng Yan
Herein we reported a facile method to prepare porous ion/molecule imprinted polymers (I-MIPs) via twice imprinting strategy for the simultaneous uptake of copper ions (Cu(II)) and λ-cyhalothrin (LC). Firstly, N -(β-aminoethyl)-γ-aminopropytrimethoxysilane (DAMO) was grafted on silica particles surface to synthesis Cu(II)-imprinted polymers to introduce iron imprinted sites. They were then utilized as stabilizers to prepare a stable W/O Pickering HIPEs template (LC as the imprinting molecule), which was then polymerized with dual imprinting sites including Cu(II) and LC. The adsorption equilibrium, kinetic results and selective recognition experiments were exhibited their prospected dual selectivity and simultaneous removal of LC and Cu(II).
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Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 3
·538-551
·
IF 3.552
Deng Xiaoyan,Wang Luxing,Xiu Qihui,Wang Ying,Han Hong,Dai Dongmei,Xu Yongji,Gao Hongtao,Liu Xien
In this work, an adsorbent, which we call MnPT, was prepared by combining MnO 2 , polyethylenimine and tannic acid, and exhibited efficient performance for Cu(II) and Cr(VI) removal from aqueous solution. The oxygen/nitrogen-containing functional groups on the surface of MnPT might increase the enrichment of metal ions by complexation. The maximum adsorption capacities of MnPT for Cu(II) and Cr(VI) were 121.5 and 790.2 mg·g −1 , respectively. The surface complexation formation model was used to elucidate the physicochemical interplay in the process of Cu(II) and Cr(VI) co-adsorption on MnPT. Electrostatic force, solvation action, adsorbate-adsorbate lateral interaction, and complexation were involved in the spontaneous adsorption process. Physical electrostatic action was dominant in the initial stage, whereas chemical action was the driving force leading to adsorption equilibrium. It should be noted that after adsorption on the surface of MnPT, Cr(VI) reacted with some reducing functional groups (hydroxylamine-NH 2 ) and was converted into Cr(III). The adsorption capacity declined by 12% after recycling five times. Understanding the adsorption mechanism might provide a technical basis for the procedural design of heavy metal adsorbents. This MnPT nanocomposite has been proven to be a low-cost, efficient, and promising adsorbent for removing heavy metal ions from wastewater.
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Science of Advanced Materials
·
2022
·Vol. 14
·期 8
·1410-1418
·
IF 1.067
Xin Jia-Ying,Li Yue,Liu Feng-Yuan,Sun Li-Rui,Wang Yan,Xia Chun-Gu
Cu(II) adulteration in preserved vegetables by unreliable producers to increase their visual appeal or compensate for natural colour changes is most common. Methanobactin (Mb) is a Cu(II)-coordinated peptide, which plays crucial role in Cu(II) capture and absorption and the catalysis
of Cu(II)-containing methane monooxygenase in methanotrophs. In this study, Mb-functionalized gold nanoparticles (Mb-AuNPs) was applied to develop a dual readout colorimetric detection for Cu(II) adulteration in preserved vegetables. In the presence of Cu(II), Mb-AuNPs was assembled into nanocluster
driven by Cu(II)/Mb coordination, and the assembly process was monitored by the visible spectrum on the variation of surface plasmon resonance peak. The results showed that, Mb-AuNPs possessed excellent peroxidase-like activity after Cu(II) coordination. In the presence of Mb-AuNPs, the amount
of Cu(II) obviously affected the rate of hydroquinone oxidation by H2O2 and the change of A246. The visible and ultraviolet dual-readout detection system containing Mb-AuNPs, hydroquinone and H2O2 exhibited high sensitivity and selectivity
for Cu(II). The linear range of visible and UV detection towards Cu(II) was 0.05–0.4 μmol/L, the limit of detection were 37.50 nmol/L and 4.48 nmol/L, respectively. In conclusion, the Cu(II) coordination driven Mb-AuNPs assembly makes it able to detect Cu(II) adulteration in
preserved vegetables by dual channel methods to eliminate the occurrence of false positives and improve the accuracy of measurement results. Such non-spatially separated Mb-AuNPs assembly and it catalyzed hydroquinone oxidation dual channel readout was simple, fast, reliable and significantly
facilitated the detection efficiency of Cu(II).
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Royal Society Open Science
·
2020
·Vol. 7
·期 3
·
IF 2.646
Yazhen Wang,Shuang Li,Liqun Ma,Shaobo Dong,Li Liu
Corn stalk was used as the initial material to prepare a corn stalk matrix-g-polyacrylonitrile-based adsorbent. At first, the corn stalk was treated with potassium hydroxide and nitric acid to obtain the corn stalk-based cellulose (CS), and then the CS was modified by 2-bromoisobutyrylbromide (2-BiBBr) to prepare a macroinitiator. After that, polyacrylonitrile (PAN) was grafted onto the macroinitiator by single-electron transfer living radical polymerization (SET-LRP). A novel adsorbent AO CS-g-PAN was, therefore, obtained by introducing amidoxime groups onto the CS-g-PAN with hydroxylamine hydrochloride (NH2OH · HCl). FTIR, SEM and XPS were applied to characterize the structure of AO CS-g-PAN. The adsorbent was then employed to remove Pb(II) and Cu(II), and it exhibited a predominant adsorption performance on Pb(II) and Cu(II). The effect of parameters, such as temperature, adsorption time, pH and the initial concentration of metal ions on adsorption capacity, were examined in detail during its application. Results suggest that the maximum adsorption capacity of Pb(II) and Cu(II) was 231.84 mg g–1 and 94.72 mg g−1, and the corresponding removal efficiency was 72.03% and 63%, respectively. The pseudo-second order model was more suitable to depict the adsorption process. And the adsorption isotherm of Cu(II) accorded with the Langmuir model, while the Pb(II) conformed better to the Freundlich isotherm model.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2020
·
IF 2.304
Su-Juan Wang,Fahime Bigdeli,Xiao-Wei Yan,Leili Esrafili,Kuan-Guan Liu,Hosein Ghasempour,Xiao-Qing Cai,Mao-Lin Hu,Ali Morsali
A novel binuclear Cu(II) complex based on ferrocene dicarboxylate was synthesized through ultrasonic and solvothermal processes and its structure confirmed by spectroscopy (IR), ultraviolet-visible spectrum (UV–Vis) and powder X-ray diffraction analysis (PXRD). Structural characterization of the complex was performed through single-crystal X-ray diffraction and thermal stability of it was perused via thermogravimetric analysis (TGA). The title Cu(II) complex was used as an effective sensor for H 2 O 2 . The electrochemical method is one of the most effective methods for material sensing. In many electrochemical techniques to increase the efficiency of activity, the electrochemically active agent is supported on a substrate. Instead of using substrate, the chemical active agent can be applied as a part of the complex structure. In this work, ferrocene dicarboxylate as an active agent in the Cu(II) complex has been used for sensing of H 2 O 2 . Due to the effect of particle size on electrochemical activity, the nano-sized complex was synthesized by ultrasonic technique (as an environmentally friendly method) and also, CuO nanoparticles were also obtained by thermal decomposition of ultrasonic treated complex at 500 °C. The size and morphology of the nanoparticles were explored by scanning electron microscopy (SEM). As well as, they were characterized through X-ray diffraction (XRD) and elemental mapping.
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