RSC Advances
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2018
·Vol. 8
·期 24
·13370-13387
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IF 2.936
Wenqiang Luo,Zhishan Bai,Yong Zhu
Porous carboxymethyl chitosan (PCMC) beads were synthesized via ionic coacervation/chemical crosslinking, using polyethylene glycol (PEG) as a porogen and calcium chloride and glutaraldehyde as physical and chemical cross-linkers. The as-synthesized PCMC beads were characterized using SEM, EDS, BET, TGA, FTIR and XPS analysis and then tested for the removal of Co(II) from aqueous solution. The effects of the initial pH, Co(II) concentration and temperature were investigated. It was found that the adsorption equilibrium is reached within 6 h and the maximum adsorption capacity is 46.25 mg g−1. In addition, the kinetics and equilibrium data are well described by pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the desorption and re-adsorption performance was also studied, and the results revealed that the prepared new adsorbent still showed good adsorption performance after five cycles of regeneration. Finally, the adsorption mechanism, including chemical and physical adsorption, was proposed on the basis of the microstructure analysis, adsorption kinetics and isotherm results, and chemical adsorption was found to be the main adsorption mechanism during the process of the removal of Co(II).
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Chaowu Wang,Qibo Zhang
Efficiently recovering critical metals from secondary resources is crucial to decreasing the environmental impact of mineral-resource mining and reducing production costs and process energy consumption. Herein, we propose a simple and comprehensive approach to recycle Co 3 O 4 from waste choline chloride/ethylene glycol (named Ethaline) electrolyte containing Co(II) ions along with solvent regeneration. Through the rational coordination adjustment using water, [CoCl 4 ] 2− complex in the Ethaline-based electrolyte is transformed to [CoCl 2 (H 2 O) 4 ] 0 and [CoCl 2 (H 2 O) 5 ] + to facilitate precipitation separation. Adding oxalic acid (OA) as a precipitator can reach 97.1% cobalt recovery efficiency with a high value-added Co 3 O 4 rod-like structure obtained by calcining the oxalate precipitate. In addition, the water-containing solvent can be regenerated via reduced pressure distillation with a high recovery efficiency of up to 98.0%. FT-IR and 1 H NMR characterizations verify that the regenerated Ethaline exhibits good structural stability. Impressively, the proposed recovery path shows high recovery efficiencies for both cobalt and Ethaline in various practical Co(II) ion-containing electrolytes. This study establishes a novel technical pathway for the resource utilization of metal-bearing waste Ethaline electrolytes, which shows an excellent prospect in solvent recycling after metal processing.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2026
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IF 7.8
Jiling Zhao,Zhaonan Yan,Qing Zhao,Weiran Diao,Ruichao Zhang,Jingyi Feng,Pingxia Zhang,Juan Wen,Yong Qin
The pursuit of high-purity cobalt is driven by its irreplaceable role in advanced electronic devices, particularly as a promising interconnect material for next-generation integrated circuits. However, the coexistence of nickel, which shares highly similar physicochemical properties with cobalt, presents a critical bottleneck in achieving electronic-grade purity cobalt. Developing efficient and selective separation materials is therefore paramount. In this study, we designed and synthesized an environmentally friendly adsorbent-chitosan beads functionalized with bis(2-pyridylmethyl)amine (CBs-PY). The CBs-PY adsorbent exhibits exceptional selectivity for Ni(II) over Co(II) under strongly acidic conditions (pH 2), achieving a remarkable separation factor of 100.31, significantly outperforming conventional pyridine-based resins. X-ray absorption spectroscopy (XANES/EXAFS) revealed the formation of stable Ni–N2 coordination structure on CBs-PY, with adsorbed Ni(II) ions showing low surface oligomerization. Furthermore, the adsorbent demonstrats excellent acid stability, reusability, and consistent performance in high-salinity environments. This work provides a sustainable and efficient strategy for the separation of Ni(II) and Co(II) in acidic media, offering significant potential for applications.
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PubMed
高影响因子
Science China-Chemistry
·
2024
·
IF 10.4
Wang Yuchen,Shi Wenjie,Tao Weixue,Zhang Jihong,Zhong Di-Chang,Lu Tongbu
Dinuclear metal synergistic catalysis (DMSC) has been evidenced to be effective in enhancing the catalytic activity for CO 2 reduction. However, the reaction kinetics of CO 2 reduction is still limited by the local CO 2 concentration around the dinuclear catalytic centers. Inspired by the structure of carbonic anhydrase, we have designed and synthesized a dinuclear cobalt(II) complex with an –OH group. This complex not only exhibits DMSC for CO 2 reduction but also possesses excellent capture capacity for CO 2 molecules. Consequently, the complex demonstrates high efficiency for the photocatalytic reduction of CO 2 to CO, with turnover number reaching as high as 43,400 and a selectivity of 97%. Even in 10% CO 2 , the complex still shows state-of-the-art catalytic activity. The results of experiments and theoretical calculations reveal that besides the DMSC contributing to the enhanced catalytic activity, the –OH group in the dinuclear cobalt(II) complex facilitates the capture of CO 2 by the formation of HCO 3 − intermediates, thereby enhancing the affinity towards CO 2 and boosting the catalytic activity for CO 2 -to-CO conversion.
研究领域:
化学
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材料科学
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环境科学
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2014
·Vol. 88
·期 12
·2157-2164
·
IF 0.488
Moghimi Ali
A novel and selective method for the fast determination of trace amounts of Co(II) ions in water samples has been developed. The procedure is based on the selective sorption of Co(II) ions using magnetic chitosan nanoparticles grafted with β-cyclodextrin at different pH followed by elution with organic eluents and determination by atomic absorption spectrometry The preconcentration factor was 100 (1 mL elution volume) for a 100 mL sample volume. The limit of detection of the proposed method is 1.0 ng mL −1 . The maximum sorption capacity of sorbent under optimum conditions has been found to be 5 mg of Co per gram of sorbent. The relative standard deviation under optimum conditions was 3.0% ( n = 10). Accuracy and applicability of the method was estimated using test samples of natural and model water with different amounts of Co(II).
研究领域:
分析化学
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环境化学
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纳米材料
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分离科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Wei Luo,Jinteng Chen,Huiting Lin,Xiaoxia Ye
60 Co is widely utilized in industries and can emit high gamma energy. The removal radioactive 60 Co in trace concentration from wastewater is important for human health and environment protection. Here, we designed a biomass base membrane with phenol hydroxyl-amino group for ultraselective enriching of trace concentration of Co 2+ from radioactive wastewater. This novel membrane adsorbent (PAM–PBWT), that is, the immobilized black wattle tannin (BWT) modified with polyethylenimine onto the polyamide microporous membrane (PAM), utilizes phenolic hydroxyl and amino group can form a coordinated coordination with Co 2+ , exhibiting high selectivity adsorption to Co 2+ even in the presence of other ions. A maximal adsorption capacity (0.39 mmol g −1 ) was reached at pH 8.0 and 323 K. The continuous adsorption experiments showed that the PAM–PBWT can enrich the trace concentration of Co 2+ (60 ng L −1 ) from radioactive wastewater in the presence of other coexisting ions (K + , Ca 2+ , Na + , Mg 2+ , Zn 2+ , Mn 2+ , Fe 3+ ). Moreover, the processing capacity of three-layer PAM–PBWT for simulated 60 Co-containing wastewater can reach 80 L m −2 . Notably, PAM–PBWT can be easily regenerated with 0.1 M HNO 3 without the loss of adsorption capacity. Our work might introduce a new strategy for realizing selectivity adsorption of trace concentration irradiation contaminants from radioactive wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Catalysis
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2021
·
IF 13.084
Yuebing Xu,Wenda Yu,Hao Zhang,Jian Xin,Xiaohui He,Bing Liu,Feng Jiang,Xiaohao Liu
Various Co-based SAPO-34 catalysts were prepared using different methods, including ion exchange (IE), incipient-wetness impregnation (IWI), and solid-phase grinding (SPG), to correlate the chemical states of Co species with the C–H and C–C bond scissions in ethane dehydrogenation. The IE-prepared Co/SAPO-34 led to stable, unreducible, and isolated exchanged Co sites anchored on the zeolite framework with a structure of −AlF–O–Co–O– and showed the highest selectivity to ethylene of close to 98% at 600 °C, which suggests that these Co sites favors suppressing the C–C bond scission in ethane. In comparison, the IWI- and SPG-prepared Co/SAPO-34 catalysts, especially for those with a high Co loading, inevitably give Co oxide clusters that are easily reduced into metallic Co. Together with catalytic results, characterizations, and DFT calculations, it is confirmed that the reduced Co clusters, especially for those outside SAPO-34 channels without the confinement effect, favor both C–H and C–C bond scission, boosting the conversion of ethane into CH4 or/and coke; however, the ionic-state −Co–O– species can smoothly terminate the ethane dehydrogenation for the ethylene product due to relatively high energy barriers for both C–H and C–C bond scission, avoiding a deep dehydrogenation and C–C cracking. As expected, the unreducible −Co–O– sites are very stable in the title reaction without deanchoring from the zeolite framework in a 100 h cyclic test. This study not only demonstrates the stable −Mδ+–Oδ− structure favorable for suppressing C–C bond scission but also highlights a catalyst-constructing strategy for Co-based and similar metal-based catalysts for dehydrogenation of other light alkanes.
研究领域:
催化化学
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材料科学
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计算化学
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DOI
高影响因子
Nuclear Engineering and Technology
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2022
·
IF 2.817
Yang Zeng,Guoyuan Yuan,Tu Lan,Feize Li,Jijun Yang,Jiali Liao,Yuanyou Yang,Ning Liu
A kind of zirconium phosphate mesoporous coordination polymer Zr-EDTMPA was successfully synthesized and characterized using XRD, FTIR, TGA, EA, SEM–EDS, and N 2 sorption-desorption measurements. The prepared Zr-EDTMPA was first employed for the removal of Co(II) from an aqueous solution, and the effects of pH, contact time, temperature, initial Co(II) concentration, reusability, and sorption mechanism were systematically investigated. The results showed that the Zr-EDTMPA is a zirconium phosphate complex formed by the coordination of EDTMPA to Zr in a molar ratio of 1:1. The sorption of Co(II) by Zr-EDTMPA was a pH-dependent, spontaneous and endothermic process, which was better fitted to the pseudo-second-order kinetic model and Langmuir isotherm model. The Zr-EDTMPA was demonstrated to have excellent reusability and presented a high sorption capacity of 73.0 mg∙g -1 for Co(II) at pH 8.0. The sorption mechanism was mainly attributed to the strong coordination between cobalt and the untapped hydroxyl functional groups on Zr-EDTMPA, which was confirmed by XPS spectra. Therefore, as a candidate sorbent with high sorption capacity and excellent reusability, Zr-EDTMPA has a great potential for the removal of Co(II) from aqueous solutions.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Junmei Liu,Yu Zhang,Xirui Miao,Haichao Li,Chunying Tao,Jin Liu,Xudong Yang
Novel nitrogen-doped carbon dots (N-CDs) were prepared by microwave method using o -phenylenediamine and formamide as raw materials, and the N-CDs were used successfully for sensing Co(II) on the basis of photoluminescence quenching. The structural characterization of the obtained N-CDs was thoroughly performed by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) spectroscopy. The optical properties were also determined by absorption and fluorescence spectra. N-CDs have bright yellow fluorescence emission and high quantum yield (29 %), with a detection limit as low as 0.38 μM. In order to detect Co(II) more conveniently and quickly, N-CDs/PVA fluorescence composite film was prepared by compounding N-CDs with polyvinyl alcohol. The fluorescence composite film combines the fluorescence characteristics of N-CDs and the stability of polyvinyl alcohol. The application range of Co(II) visual detector in the water environment is expanded.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Xiaoyong Yang,Fengping Jie,Bingjie Wang,Zhishan Bai
Environmental pollution by industrial effluents polluted with hazardous heavy metals has great concern. A novel microemulsion system (sodium dodecanoate/pentan-1-ol/heptane/NaCl) was prepared for the treatment of cobalt (Co) and manganese (Mn) wastewater. The effects of the batch extraction conditions were systematically studied and the extraction efficiency of Co(II) and Mn(II) were 98.2% and 97.5% respectively at the optimal conditions. Utilizing the centrifugal reinforcement of the annular centrifugal extractor (ACE), the continuous extraction of cobalt and manganese wastewater by microemulsion could be achieved. Under the optimized operation conditions: the motor speed of 1988 rpm, a flow ratio of 1/5, and a total flow rate of 48 L/h, the maximum extraction efficiency reached up to 99.9% for Co(II) and 99.1% for Mn(II), respectively. The stripping of Co(II) and Mn(II) from the microemulsion phase was also conducted using hydrogen chloride solution, indicating a high stripping efficiency. The investigation of synergistic extraction with microemulsion and ACE proposed an efficient treatment for Co and Mn wastewater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ying Han,Qingjie Lu,Weiwei Li,Yaping Guo,Yue Wu,Hongyuan Liu,Xiaoping Zheng,Yanhong Gao
Diclofenac (DCF) is one kind of pharmaceuticals and personal care products (PPCPs), and it is imperative to develop a green and efficient method to remove it. The removal of DCF with zinc (Zn) in the presence of Cu(II) and Co(II) were investigated on the influence factors, products, and mechanism. The results showed that with the increasing of Cu(II) and Co(II) concentrations, the reactions were accelerated. The removal rate was higher with lower pH value. In all the systems, the DCF removal rate hardly changed when the dissolved oxygen (DO) concentration was 0–8 mg·L −1 and increased at 20 mg·L −1 . Products analysis showed that the products were hydroxylated DCF (DCF 0 ) and an unknown product (DCF u ) in Zn system, monochlorinated DCF (DCF 1 ) in Zn/Cu(II) system, DCF 1 and dechlorinated DCF (DCF 2 ) in Zn/Co(II) system. The order of toxicity from highest to lowest was DCF, DCF 0 , DCF 1 , DCF 2 . The corrosion degree of zinc powder surface increased in the presence of Cu(II) and Co(II). After 48 h, ZnO formed in Zn system. In Zn/Cu(II) system, CuO and Cu 2 O formed in addition to ZnO. In the Zn/Co(II) system, Co 3 O 4 , ZnO and Zn(OH) 2 formed. After adding Cu(II) and Co(II), the corrosion currents increased. In Zn/Cu(II) system, DCF was dechlorinated to DCF 1 by catalytic hydrogenation. In Zn/Co(II) system, DCF was mainly dechlorinated to DCF 1 and DCF 2 by catalytic hydrogenation. This technique provides an alternative method for DCF removal and expands the application field of Zn reduction technology.
研究领域:
环境科学
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药学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
·
IF 9.8
Xiaodan Zhao,Jiahui Wei,Ying Wu,Zuoming Zhou,Guohua Jing
Sulfite autoxidation in combination with the cobalt-based heterogeneous activators, has recently emerged as the efficient sulfate radical (SO 4 •− ) generation process for organic micropollutant abatement in the water and wastewater treatment , yet the sluggish >Co(II)/Co(III) redox cycling currently compromises the efficacy of radical generation and the potential applications. Herein, regarding that the reductive W(IV) species in WS 2 can modulate the >Co(II)/Co(III) redox cycling in the advanced oxidation processes , confinement of cobalt with WS 2 (Co-WS 2 ) is designed and characterized. The Co-WS 2 /sulfite process achieves an ultrafast tetracycline (TC) abatement (∼100 % abatement of TC within 1 min) under circumneutral conditions with lower dosage of sulfite and activator, outperforming the current cobalt-based heterogeneous counterparts. The dominant reactive radicals are identified as SO 4 •− and hydroxyl radical (HO • ), which are quantified to be 9.7 μM and 4.5 μM, respectively. The superior radical generation efficiency and the concomitant TC abatement rely on the excellent redox properties and electron transfer capability of Co-WS 2 . The inter-transformation of >Co(II)/>Co(III) can be accelerated via the involvement of the reductive W(IV) species with the redox-reversibility of the W(IV)/W(VI) couple in the presence of sulfite. The TC degradation intermediates and the corresponding pathways are also proposed according to the ultra-performance liquid chromatography and quadrupole-time of flight mass spectrometry (UPLC-QTOF-MS) analysis. In addition, the influences of the reactant dosage, coexisting anions (HCO 3 − , HPO 4 2− , Cl − and NO 3 − ), humic acid and the various real water matrices on TC abatement are thoroughly explored. Especially, the Co-WS 2 /sulfite process is advantageous owing to the negligible effect of the coexisting anions on the TC abatement. This study provides a novel heterogeneous activator for significantly improving sulfite activation efficacy to achieve the efficient organic micropollutant abatement.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）