Biomass Conversion and Biorefinery
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2023
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IF 4
Nie Fahui,Guan Kun,Zou Chenglong,Xu Zhiwei,Liu Zhanmeng
Ferrate, as an internal oxidation modifier, is rarely used in the preparation of magnetic biochar. This research promotes rice shell charcoal modified by K 2 FeO 4 preparation of oxygen-containing groups and ɤ-Fe 2 O 3 magnetic biochar. Magnetic rice husk biochar (MBC) is prepared to adsorb Ni(II) from aqueous solutions. The effects of various parameters on the adsorption of Ni(II) by MBC have been studied, and the results show that MBC has an excellent adsorption capacity for Ni(II). At 25 °C and pH 7.0, the removal rate of Ni(II) reaches 96.1% within 24 h at an adsorbent dose of 0.5 g/L when the initial Ni(II) concentration is 20 mg/L. The kinetic model conforms to the pseudo-second-order kinetic model and the intra-particle diffusion model within 36 h. Moreover, the adsorption data were successfully reproduced by the Langmuir isotherm, and the maximum adsorption capacity is 42.69 mg/g. The adsorption data conform to the D-R model, and the calculated average adsorption free energy is 41.03 kJ/mol, indicating that the adsorption process is mainly chemical adsorption. Thermodynamic study indicates that the endothermic adsorption process is spontaneous and can be promoted by the increase in temperature. This study was expected to provide a reference and theoretical basis for the treatment of Ni(II)-containing wastewater using modified rice husk biochar.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Guangyu Duan,Xintong Li,Xin Ma,Wei Zhong,Shuai Wang
Cu/Ni-bearing wastewater contamination has recently been a challenge for the environmental protection worldwide. Herein, a novel poly(2-acrylamide-pentanedihydroxamic acid) (PAPDA) resin containing –CONHOH and –COOH groups was prepared and applied to effectively remove Cu 2+ and Ni 2+ from heavy metal wastewater. The batch adsorption experiments revealed that the maximum adsorption capacities of PAPDA resin for Cu 2+ and Ni 2+ were 436.08 and 195.05 mg·g −1 , respectively, which were 10.20 and 9.45 times higher than that of polyacrylic resin . Specifically, the adsorption kinetics and thermodynamics of PAPDA were respectively consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that the adsorption is a single-layer chemisorption process. Besides, the adsorption mechanism was investigated by SEM, XRD, FT-IR, XPS, DFT calculations, suggesting that the PAPDA resin possessing abundant active sites could effectively adsorb the heavy metal ions . Noticeably, the –CONHOH groups represented the strong affinity towards Cu 2+ and Ni 2+ by forming stable five-membered rings. In addition, column experiments were conducted to study the practical adsorption process of PAPDA resin to heavy metal ions. Overall, the results proved that the novel PAPDA resin as a green and highly efficient adsorbent has a promising potential for the treatment of heavy metals-containing wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Shichao Zhang,Wenbin Chen,Junju Mu,Jianyu Han,Chaofeng Zhang,Zhuyan Gao,Jian Zhang,Yehong Wang,Feng Wang
Rapid kinetic adsorption and long-term cyclic stability are two of the major obstacles to the industrialization of solid amine adsorbents. The morphology and dispersibility of the organic amine in the pore structure of the support can strongly affect the adsorption rate and stability of CO 2 . In this work, we propose a strategy that enhances the dispersion and stability of tetraethylene pentamine (TEPA) via anchoring TEPA with single site Ni(II) in the pore of the commercial mesoporous silica gel (SG). The microscopic morphology and dynamic behavior of TEPA molecules in the adsorbents preparation process were explored by molecular dynamics simulation, which proved that the dispersibility of anchored TEPA in the porous structure has been improved, resulting in enhanced mass transfer and increased kinetic adsorption rate. The anchored Ni-TEPA/SG adsorbents exhibit a 37.5% faster kinetic adsorption rate than TEPA/SG adsorbents at 30 wt% TEPA loading, and the time required to reach 90% of maximum adsorption capacity is shortened by 6 times. Besides, the CO 2 adsorption performance of the optimized Ni-TEPA/SG adsorbent remains unchanged after 20 cycles, consolidating the potential of our proposed strategy in improving the kinetic adsorption rate and cyclic stability of solid amine adsorbents as well as promoting its industrialization.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
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IF 9.038
Weitian Cai,Dionysios D. Dionysiou,Fenglian Fu,Bing Tang
The treatment of heavy metal pollution in aquatic environment, especially the pollution caused by multiple heavy metal ions, has been a growing global concern for decades. To address this problem, it is urgent to explore effective and low cost adsorbents which can remove multiple heavy metal ions simultaneously. Herein, Cr(VI) and Ni(II) removal from water by MoS 2 with widened interlayer spacing was systematically investigated in comparison with pure MoS 2 . A series of techniques, including X-ray powder diffraction (XRD), Transmission electron microscopy (TEM), and Brunauer–Emmett–Teller (BET) surface area and porosimetry analysis were applied to characterize the nanocomposites. The XRD results confirmed the enlarged interlayer spacing of MoS 2 by intercalating cetyl trimethyl ammonium bromide (CTAB) into the interlamination. The maximum adsorption capacities of Cr(VI) and Ni(II) for MoS 2 /CTAB were 79.4 mg g −1 and 88.3 mg g −1 , respectively. Moreover, a synergistic effect in the simultaneous removal of Cr(VI) and Ni(II) was observed. A new Cr(VI) removal mechanism involving redox reaction between Cr(VI) and Mo(IV) in MoS 2 /CTAB was verified. The removal efficiencies of Cr(VI) and Ni(II) still remained high at the end of fifth cycle, indicating that MoS 2 /CTAB has a great potential to remove heavy metals from wastewater.
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Min-Qiang Wang,Yan Zhang,Shu-Juan Bao,Ya-Nan Yu,Cui Ye
Recently metal-organic frameworks (MOFs) have attracted more attention in developing new electrochemical sensors due to their unique properties such as crystalline ordered structures, tunable pore sizes, large surface areas, chemical tenability and thermal stability. However, the direct application of single component MOFs in electrochemistry is limited owing to their poor electronic conductivity and inferior electrocatalytic ability. Herein, Ni(II)-Based metal-organic framework (Ni(II)-MOFs) was successfully anchored on carbon nanotubes (CNTs) by in situ solvothermal method for the first time. In the as-prepared composites, 2∼3 nm MOFs nanoparticles homogeneously dispersed on conducting CNTs allowed for the MOFs nanoparticles to be wired up to a current collector through the underlying conducting CNTs. As the electrode materials of an non-enzymatic H 2 O 2 biosensor, the Ni(II)-MOFs/CNTs exhibited excellent electrocatalytic performance including a wide linear detection range from 0.01 to 51.6 mmol L −1 , low detection limit of 2.1 μmol L −1 and very fast response of 2.5 s for H 2 O 2 sensing. Most importantly, the stability and conductivity of Ni(II)-based MOFs is far higher than that of pure MOFs.
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CHINESE CHEMICAL LETTERS
·
2024
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IF 9.4
Junyi Yu,Yin Cheng,Anhong Cai,Xianfeng Huang,Qingrui Zhang
Herein, the Cu(III) synthesized from copper plating effluent was developed for the first time to evaluate the onsite degradation performance of heavy metal complexes in the wastewater, thus achieving the purpose of “treating waste with waste”. The results indicated that synthetic Cu(III) presented the excellent decomplexation performance for Cu(II)/Ni(II)-organic complexes. The removal efficiency of Cu(II)/Ni(II)-EDTA significantly increased with increasing Cu(III) dosage, and the degradation of Cu(II)/Ni(II)-EDTA by synthetic Cu(III) system displayed highly pH-dependent reactivity. The radical quencher experiments confirmed that Cu(III) direct oxidation were mainly involved in the degradation of Cu(II)-EDTA. Additionally, the continuous decarboxylation process was proven to be the main degradation pathway of Cu(II)-EDTA in Cu(III) system. The coexisting substances (SO 4 2− , Cl − and fulvic acids) showed little impacts at low level for the removal of Cu(II)/Ni(II)-EDTA, while retarded the degradation of Cu(II)-EDTA slightly at high level, which features high selective oxidation. Encouragingly, it was also effective to remove Cu(II)/Ni(II)-EDTA from in treating actual Cu/Ni-containing wastewater through synthetic Cu(III) treatment.
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Inorganic Chemistry Frontiers
·
2025
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IF 6.4
Xiaopei Li,Xianxu Chu,Kefan Ying,Xi Chen,Peng Sun,Haiyun Xu,Lu Li,Jie Zhang,Wenjuan Li
The five novel nickel organic complexes featuring different electron-rich and electron-deficient groups were synthesized as electrocatalysts by using N-(aryl/alkyl)-2-isonicotinoylhydrazine-1-carbothioamide compounds in coordination with nickel acetate tetrahydrate and 1,10-phenanthroline. These Ni-complexes were characterized using infrared and Raman spectroscopy and were subsequently employed for the oxygen evolution reaction (OER) in water splitting under alkaline conditions. The overpotential and Tafel slope for Ni-based complex Ni-1 were as low as 454 mV and 111.90 mV dec-1, respectively, at a current density of 10 mA cm-2, indicating excellent electrochemical performance. Furthermore, Ni-1 demonstrated good electrochemical stability, with only minor voltage fluctuations observed during the continuous bubble generation over a 40 hours electrolysis period and nickel maintains a +2 oxidation state (Ni2+) in the complex both before and after the OER test via characterization of N2p spectra by X-ray photoelectron spectroscopy (XPS) measurements. This study confirms the electronic effect of substituent groups on the water-splitting ability of Ni-complexes bearing the two different organic ligands, showing that the overpotential and Tafel slope increase with a decrease in the electron-donating capacity of the substituent groups.
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Materials
·
2026
·Vol. 19
·期 8
·1532
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IF 3.7
Keyu Chen,Yongming Wei,Kaihuai Duan
Highlights A novel PS-2-AB chelating resin was synthesized by grafting 2-aminobenzimidazole onto polystyrene. The resin showed Cu(II) and Ni(II) adsorption capacities of 125.04 mg/g and 157.44 mg/g, respectively. The resin maintained over 84% adsorption capacity after five regeneration cycles. To address heavy metal contamination in wastewater, this study developed a novel chelating resin (PS-2-AB) by grafting 2-aminobenzimidazole onto chloromethylated polystyrene. The resin was characterized using SEM, BET, FTIR, and XPS to confirm successful modification and analyze its structural properties. Batch adsorption tests were conducted to evaluate its removal performance for Cu(II) and Ni(II) ions. Under optimal conditions (pH 5.0–7.0, dosage: 1.0 g/L), PS-2-AB achieved maximum adsorption capacities of 125.04 mg/g for Cu(II) and 157.44 mg/g for Ni(II), which are significantly higher than those of the commercial resin D113 (44.68 mg/g for Cu(II) and 25.17 mg/g for Ni(II)) under the same conditions. Adsorption kinetics followed the pseudo-second-order model, indicating chemisorption-dominated behavior, while equilibrium data fit the Langmuir model, suggesting monolayer adsorption. Thermodynamic parameters confirmed a spontaneous and endothermic process. After five regeneration cycles, PS-2-AB retained approximately 87% (Cu) and 89% (Ni) of its original capacity, demonstrating good reusability. These results indicate that PS-2-AB exhibits markedly better adsorption performance than D113, making it a promising and cost-effective adsorbent for the efficient removal of Cu(II) and Ni(II) from aqueous media.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Qiyuan Zheng,Zuoying Cao,Shengxi Wu,Qinggang Li,Mingyu Wang,Wenjuan Guan,Guiqing Zhang
Direct extraction of Ni(II) from Fe(III), Al(III), Ca(II), Mg(II), and Mn(II) is a bottleneck issue in the hydrometallurgy processes of laterite-nickel ore, spent batteries, and other secondary sources. One of the biggest challenges in achieving direct extraction of Ni(II) is the lack of stable and efficient extractants. Hence, a novel bipyridine extractant MSL211 was designed and synthesized in this paper. With its strong steric resistance and electrostatic interaction, MSL211 can form a stable eight-membered chelating ring with Ni(II), thereby having a high bonding ability toward Ni(II). Therefore, based on the high bonding ability of MSL211 toward Ni(II) and the low extraction capacity of DNNSA for Fe(III), an efficient synergistic extraction system of DNNSA-MSL211 was proposed. The synergistic extraction system of DNNSA-MSL211 realizes direct extraction of Ni(II) from Fe(III), Al(III), Ca(II), Mg(II), and Mn(II) without neutralization, precipitation, and solid/liquid separation processes, which are inevitable but problematic processes in the current hydrometallurgy processes for removing Fe(III), Al(III), and Mn(II). The effects of the molar ratios of DNNSA:MSL211, shaking time, temperature, O/A ratios, and equilibrium pH on the extraction behavior of Ni(II) were investigated. Under optimum conditions, the extraction efficiency of Ni(II) was as high as 97.62%, and the separation coefficient of Ni(II) over all impurities was greater than 400. To elucidate the mechanism of the high selectivity of DNNSA-MSL211 toward Ni(II), DFT calculations were carried out to calculate the binding energy (ΔE) and Gibbs free energy (ΔG(ext)) of the extraction process. Furthermore, this paper investigated the entire ″extraction-stripping″ process, demonstrating that the synergistic extraction system of DNNSA-MSL211 avoids neutralization, precipitation, and solid/liquid separation processes, minimizes hazardous waste generation, and shortens process flow while meeting the objectives of sustainable and clean production.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ying Lu,Fujian Yang,Siyuan Chen,Wenchao Shi,Chengdu Qi,Guilong Peng
In this work, Ni(II) was used as peroxymonosulfate (PMS) activator for decomplexation of Ni(II)-citrate, and subsequently applied for the decomplexation of chelated nickel in the electroless nickel plating wastewater. Effect of the co-existed substances (HCO 3 − , HPO 3 2− , H 2 PO 2 − , and P 2 O 7 4− ) on the decomplexation of Ni(II)-citrate were evaluated. Interestingly, except for H 2 PO 2 − , the presence of HCO 3 − , HPO 3 2− , and P 2 O 7 4− enhanced the decomplexation efficiency of Ni(II)-citrate via promoting the decomposition of PMS. Based on the radical quenching experiments and electron spinning resonance (ESR) spectra analysis, OH, SO 4 ‐ , and 1 O 2 were the primary reactive species involved in the decomplexation reaction process. Furthermore, after the decomplexation of the electroless nickel plating wastewater by PMS, the recovery of nickel was successfully achieved via adsorption coupled with electrodeposition , and 93.1% nickel recovery could be accomplished with initial Ni(II) eluent concentration of 32.5 g/L. Therefore, this study provides a green and promising approach for the application of advanced oxidation processes based on PMS activation, and has the potential to convert recoverable resources into value-added products from electroplating wastewater.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Hongli Wang,Hao Yuan,Ke Lu,Zhi Zheng,Yihao Xu,Jianping Liang,Qingnan Xu,Junfeng Gao,Wenchun Wang,Dezheng Yang
The severe adverse impacts of toxic metal ions on ecosystems and human health call for the urgent development of an efficient adsorbent. In this study, a novel micro-mesoporous zeolite material was prepared by nanosecond pulsed discharge-amino co-modification method to selectively adsorb Ni(II) ions. The prepared micro-mesoporous adsorbent exhibited a large specific surface area (1042 m 2 g −1 ) and were rich in -NH 2 and -COOH that can produce surface complexation and electrostatic adsorption with Ni(II) ions. The optimal experimental parameters were obtained at 8 min of discharge time, 16 kV of pulse peak voltage, 1 kHz of pulse repetition frequency, and pH = 7. The Ni(II) ions removal efficiency of nanosecond pulsed discharge-amino co-modified MCM-41 reached 98% within 20 min, an increase of 54% and 26% compared to the raw and solo amino modification, respectively. The adsorption processes of Ni(II) ions were well fitted by pseudo-second-order and Langmuir isotherm models, indicating that the adsorption involves monolayer chemisorption . Despite the presence of other coexisting ions, the prepared zeolites retained their excellent adsorption selectivity for Ni(II) ions. This co-modification method overcomes the drawback of mesopores blockage and further implants micropores in adsorbents, providing a novel idea and broad prospect for adsorbent modification and removal of Ni(II) ions.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
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IF 7.65
Huiyu Liang,Ke Xiao,Liyan Wei,Bo Yang,Gang Yu,Shubo Deng,Huabo Duan,Caizhen Zhu,Juying Li,Junmin Zhang
A novel CuO-CeO 2 -CoO x nanocatalyst was prepared for heterogeneous Fenton-like reaction to break the Ni 2+ -chelate into free Ni 2+ in electroless nickel plating wastewater, followed by separation of Ni 2+ in an insoluble form. The composite nanocatalysts prepared by co-precipitation method were characterized by XRD, TEM, and XPS, et al. Its catalytic activity as Fenton-like reagent was evaluated by the removal efficiency of Ni(II)-citrate after decomplexation and postprecipitation treatment. Subsequently, the effects of operating parameters on the decomplexation efficiency of the nanocatalysts were investigated including calcination temperature of catalysts, H 2 O 2 concentration, catalyst dosage, initial pH and reaction temperature. Under optimized condition, the Ni(II)-citrate complexes ( C 0 = 1.0 mM) achieved the complete decomplexation (>99.9%) within 60-min reaction using 0.3 g/L of CuO-CeO 2 -CoO x calcined at 450 °C and 75 mM of H 2 O 2 at pH 3.0 under 50 °C of reaction. Then, Ni 2+ after decomplexation could be completely removed by the subsequent precipitation at pH 11.0. In addition, the life test of CuO-CeO 2 -CoO x catalyst indicated that, after recycled 10 times, its activity for decomplexation of Ni(II)-citrate decreased no more than 8%. As a result, this new heterogeneous Fenton-like process is promising for decomplexation and purification of electroless nickel plating wastewater as a sludge reduction technology.
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