Scientific Reports
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2025
·Vol. 15
·期 1
·1-15
·
IF 3.9
Feng Liujun,Chen Zhiqiang,Wang Haiyan,Chen Zhibiao,Chen Zuliang,Liu Jianhua,Zeng Yuee
Phytoremediation is currently a very popular remediation method for salvaging rare earth mining sites. However, there is still a challenge concerning how to use secondary resources such as plant biomass following the extraction of rare earth elements (REEs). Herein, Dicranopteris pedata (Houtt.) Nakaike, a REEs hyperaccumulator, served to fabricate REEs-rich carbonisation materials (REEs/C) at different temperatures. The results showed that the percentages of Pb(II) removed using REEs/C prepared at 400 °C (REEs/C-4) and 800 °C (REEs/C-8) were 85.1% and 84.0%, respectively. These amounts were better than that of REEs-C prepared at 600 °C (REEs/C-6 (67.0%)). Characterisation analysis confirmed that rich functional groups like aromatic, hydroxyl and C = C/C-C in REEs/C-4 provided more chelation sites to effectively complex with Pb(II), while the superior removal capacity of REEs/C-8 resulted from the enrichment of more REEs and abundant pore structure. Chemisorption, such as ion exchange and chelation, plays a significant role in adsorption. During the carbonisation process of REEs/C, the REEs enriched in Dicranopteris pedata contributed to the formation of rare earth oxides and oxygen vacancies in the material, and these properties enhanced the Pb removal ability of REEs/C. Moreover, the REEs contained in the material did not cause a leaching phenomenon during Pb removal, which is a safe and environmentally friendly material. Finally, the REEs/C was applied to wastewater, and it was found that this material could effectively adsorb Pb from wastewater. Overall, this study generates a new insight into: firstly, how to use phytoextracted biomass containing REEs as valuable REEs/C materials; and secondly, how to save the environment by using technology that promotes recycling of used materials.
研究领域:
环境科学
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材料科学
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植物学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 5
·
IF 1.768
Shiyong Xiao,Qizhong Xiong,Hongjian Zhou,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
A simple and environmental friendly oxoacetohydrazide functionalization method is developed to convert the straw cellulose into high performance adsorbents for effective Pb(II) removal. The adsorption experimental results demonstrated that the resultant oxoacetohydrazide-modified cellulose (OMC) possesses a dramatically improved Pb(II) adsorption capacity (82.9 mg/g), which is over six times of that for the unmodified celluloses (13.6 mg/g). The mechanistic studies confirm that the markedly enhanced Pb(II) adsorption capability of OMC can be attributed to the formation of N-Pb-N bonds resulting from the strong chelating interactions of Pb(II) with oxoacetohydrazide. Also, the OMC shows an excellent reusability, capable of retain 95% of its original Pb(II) adsorption capacity after three consecutive adsorption cycles. The findings of this work pave a way to transform the agricultural byproducts into high performance functional materials. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42950.
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
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xue-dong Wang,Ya Li,Tao-tao Dai,Xue-mei He,Ming-shun Chen,Cheng-mei Liu,Rui-hong Liang,Jun Chen
Novel pectin/poly(m-phenylenediamine) (P/PmPDA) microspheres with different content of PmPDA were prepared by assembling PmPDA on the surface of pectin microsphere. The successful preparation was confirmed by the results of Fourier Transform Infrared spectra (FTIR), scanning electron microscopy (SEM) and elemental analysis. Compared with pectin microsphere, the Pb 2+ adsorption performance of P/PmPDA microspheres was significantly improved. The results of batch adsorption experiments were in good agreement with the Langmuir isotherm model for Pb 2+ adsorption, indicating the adsorption was monolayer. The maximum adsorption capacity of Pb 2+ was found to be 390.9 mg/g. The kinetic adsorption process was well described by the pseudo-second-order model and chemical adsorption dominated the adsorption process. The potential mechanisms of Pb 2+ adsorption were speculated as ion exchange and chelation, which were supported by X-ray photoelectron spectroscopy (XPS). The P/PmPDA microspheres showed good recyclability after five adsorption/desorption cycles. All these results indicated the potential of P/PmPDA microspheres for removing Pb 2+ .
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
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
An Wang,Meiling Wu,Zhongyuan Li,Yuqiang Zhou,Zhanbin Huang
In this study, sulfuric acid modified steel slag (SS-HS) was prepared using a one-step hydrothermal synthesis method, utilizing converter steel slag as the raw material, to remove heavy metal Pb 2+ from water. Single-factor experiments were conducted to determine the influence of different factors on the adsorption capacity. The obtained material was characterized using EDS and FT-IR to analyze its composition. Response surface methodology was employed to optimize the preparation conditions of SS-HS, and the optimal conditions were determined as follows: sulfuric acid dosage of 8.07 mL, reaction time of 9.98 h, and reaction temperature of 99.44 ℃. SS-HS was prepared under the optimized conditions obtained from the response surface methodology. The physicochemical properties of the prepared SS-HS were analyzed using SEM , EDS, and BET. It was observed that the specific surface area of SS-HS increased from 8.0041 m 2 /g to 131.8312 m 2 /g. The average pore volume was 0.2101 cm 3 /g and the average pore size was 6.3737 nm for mesoporous material. Additionally, the influence of different adsorption conditions on the adsorption capacity of Pb 2+ was investigated. The optimum adsorption conditions reached the maximum adsorption amount of 193.05 mg/g at Pb 2+ solution concentration of 700 mg/L, adsorbent mass of 0.03 g, temperature of 55 °C, pH= 5. To further understand the adsorption process , kinetic and isotherm models were established. The results indicated that the adsorption process followed a pseudo-second-order kinetic model and Freundlich isotherm model, suggesting a monolayer chemical adsorption . XPS analysis was employed to determine the composition and valence state of the materials, confirming that the adsorption mechanism of SS-HS primarily involved electrostatic adsorption, ion and ligand exchange , and surface precipitation. This study not only introduces a novel approach for the resource utilization of steel slag but also presents an innovative adsorbent for efficient removal of Pb 2+ from aqueous solutions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
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.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 317
·期 3
·1399-1408
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IF 1.181
Yang Chao,Zhong Yilong,Li Lei,Ren Xuemei,Sun Yuan,Niu Deqing,Liu Yang,Yin Maowei,Zhang Dafeng
In present paper, delta manganese dioxide is prepared with a hydrothermal method, and the adsorption is investigated with a batch method. The maximum sorption capacity for uranium and lead are calculated to be 41.32 and 492.61 mg g −1 respectively. Pseudo-second-order kinetic is proved to regulate the sorption kinetics, and Langmuir equation fits well with the isotherms. Results show that the mechanism of sorption is controlled by cation exchange and inner-sphere surface complexation. The study provides basic data for revealing the adsorption kinetics, rate-controlling mechanisms, and thermodynamic parameters of the adsorption process.
研究领域:
环境科学
·
化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Jiayan Wu,Quanyun Ye,Meiqing Chen,Leiye Sun,Sheng Liu,Linqing Liu,Pingxiao Wu,Nengwu Zhu
The heteroaggregation of nanoplastics with minerals has been widely investigated. However, few studies have focused on the interaction between similar negatively charged clay minerals and nanoplastics, especially how their interactions affect the migration of heavy metals. This study investigated heteroaggregation of kaolinite (a model of natural mineral) with polystyrene nanoplastics (PSNPs) and the effect of heteroaggregates on lead (Pb 2+ ) sorption . Dynamic light scattering (DLS) measurement highlighted that PSNPs owned higher colloidal stability than kaolinite in aquatic environments. Due to the surface charge heterogeneity of kaolinite, the heteroaggregation behavior between kaolinite and PSNPs was highly pH-dependent. At pH 3.0 and 6.0, kaolinite particles with positively charged edge surfaces favored the association of PSNPs. PSNPs were found to be primarily attached on the kaolinite edge (010) surface, followed by Al-terminated (001) and Si-terminated (00 1 ¯ ) surfaces based on density functional theory (DFT) calculations. At pH 10.0, they had negligible interaction due to the strong electrostatic repulsion. Interestingly, kaolinite carried more negative charges after heteroaggregation with PSNPs, resulting in slower edge-to-face homoaggregation and higher dispersibility, and thus increasing the sorption capacity for Pb 2+ . This investigation provided a new understanding of nanoplastics interactions with negatively charged minerals and highlighted the vital role of nanoplastics in mineral stability and contaminant migration.
研究领域:
环境科学
·
土壤化学
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污染生态学
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 8
·3669-3681
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IF 3.2
Hongzhang Li,Xinhua Liu,Eryan Chi,Guocai Xu
Phytic acid (PA) modified polyacrylonitrile (PAN) nanofiber membranes for heavy metal adsorption were fabricated using electrospinning for the first time, and its mechanical properties and heavy metal adsorption under various conditions were tested. The results demonstrated that PA modification improved the mechanical properties of PAN nanofiber membranes at low modification ratio due to increased intermolecular hydrogen bonds and cross-linking. The highest breaking strength and elongation at break were 70.1% and 31.5% over PAN without modification when the PA:PAN ratio was close to 1:5. The Pb 2+ absorption tests in the water solutions demonstrated that the optimal PA:PAN ratio was 1:1, the optimal temperature was 30°C, and the optimal pH was 7. With the optimal parameters, the adsorption capacity reached the maximum and equilibrium after 4 h. The adsorption capacities increased with higher initial Pb 2+ concentrations. The highest adsorption capacity in this study was approximately 240.1 mg g −1 at the initial Pb 2+ concentration of 750.72 mg L −1 . In addition, after de-adsorption process, the 1:1 PA modified membranes maintained 91.9% re-adsorption capacities compared to primary adsorption. Consequently, the PA-modified PAN nanofiber membranes showed promising potentials of metal ion adsorption in wastewater treatment. Highlights Phytic acid modified polyacrylonitrile nanofiber membranes were fabricated. Low ratio modification improved the mechanical properties. The optimal modification ratio for Pb 2+ adsorption is 1:1. The maximum Pb 2+ adsorption capacity was 240.1 mg g −1 in this study. The membranes maintained 91.9% capacities at re-adsorption tests.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2024
·
IF 4.8
Van-Hien Pham,Bich-Ngoc Duong,Duy-Khoi Nguyen,Loc Ton-That,N.T. Dang,D. Thanh Khan,Ngoc-Quyen Tran,Ngoc Duy Nguyen,Van-Phuc Dinh
The synthesis of zeolite ETS-10 is strongly influenced by factors such as pH, the amount of the structure-directing agent, hydrothermal temperature and duration, which collectively affect the material’s morphology and structure. This study thoroughly investigates the effects of these parameters on the synthesis of ETS-10 zeolite using TiCl 3 and a waterglass solution. Characterization of the materials was performed through X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR), and nitrogen isotherm adsorption-desorption at 77 K (BET-BJH) techniques. The findings indicate that pH and the structure-directing agent significantly influenced the phase composition , while hydrothermal temperature predominantly determined the crystallization rate of ETS-10. Optimal synthesis conditions were established at an initial pH of 11, employing 0.3 g of the structure-directing agent and conducting hydrothermal crystallization at 230 °C for 24 h. Under these conditions, the ETS-10 zeolite produced exhibited a high surface area of 300.1 m 2 /g, making it effective in removing Pb 2+ ions from solution. In particular, when tested under optimal conditions (pH 5) for 600 min, Pb (II) adsorption by ETS-10 reached a maximum uptake capacity of 956.19 mg/g, as determined by the Langmuir isotherm model. This capacity surpasses that of as-synthesized ETS-10 prepared from alternative Ti sources and other materials used in previous studies on Pb(II) adsorption.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Yongcun Song,Nan Wang,Li-ye Yang,Yang−guang Wang,Di Yu,Xiao-kun Ouyang
Metal–organic frameworks (MOFs) have received special attention from scientists owing to their excellent adsorption performance. However, the difficulty in separating MOFs from adsorbed metals following use has limited their application. A zeolitic imidazole-based MOF with broad applicability for sorption of Pb(II) is examined. In this work, a novel adsorbent employing ZIF-8/calcium alginate microparticles was prepared using sodium alginate and ZIF-8. This adsorbent was characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The performance of the ZIF-8@CA microparticles in adsorbing Pb(II) from a Pb(II) solution was investigated, and the impacts of the initial Pb(II) concentration, reaction time, pH, and reaction temperature on the reaction process were investigated. The results showed that ZIF-8@CA microparticles exhibited a maximum adsorption capacity of 1321.21 mg/g at pH 5 after 120 min, and the adsorption process was found to fit the Langmuir isotherm model (R2 = 0.9856) and the pseudo-second-order kinetic model (R2 = 0.9999). These results showed that the adsorption of Pb(II) was an endothermic process. The regeneration experiment with ZIF-8@CA revealed that the removal efficiency of Pb(II) was greater than 80% even after five cycles.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2021
·Vol. 56
·期 8
·2100012
·
IF 1.639
Qinjiang Zhao,Lihong Zhou,Jie Du,Guanghui Wang,Xiangjun Pei
As an ecological and environment-friendly building material, sticky rice mortar has attracted the attention of many researchers. Amylopectin is the most important organic matter of it, which can improve the mechanical properties and durability of sticky rice mortar by inducing mineralization of calcium carbonate (CaCO 3 ). However, amylopectin induced formation of CaCO 3 has not been reported. In this paper, mineralization of CaCO 3 induced by gelatinized amylopectin is investigated. For comparison, the different morphologies of CaCO 3 are studied in the presence of Mg 2+ , Fe 3+ . Moreover, these CaCO 3 products with different morphologies are used to clean the waste water. The results indicate that gelatinized amylopectin is conducive to formation of pumpkin-like vaterite. It forms uniform rod and dumbbell-shaped calcite in the presence of Mg 2+ , form calcite with stepped depressions in the presence of Fe 3+ . The adsorption of Pb(II) can reach extremely high level (1445.86 mg g −1 ) with the rod-like calcite.
研究领域:
材料科学
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环境科学
·
生物化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Shu-Cui Ma,Ji-Lin Zhang,De-Hui Sun,Gui-Xia Liu
Removal of noxious heavy metal ions (e.g. Pb(II)) by surface adsorption of minerals (e.g. diatomite) is an important means in the environmental aqueous pollution control. Thus, it is very essential to understand the surface adsorptive behavior and mechanism. In this work, the Pb(II) apparent surface complexation reaction equilibrium constants on the calcined diatomite and distributions of Pb(II) surface species were investigated through modeling calculations of Pb(II) based on diffuse double layer model (DLM) with three amphoteric sites. Batch experiments were used to study the adsorption of Pb(II) onto the calcined diatomite as a function of pH (3.0–7.0) and different ionic strengths (0.05 and 0.1 mol L −1 NaCl) under ambient atmosphere. Adsorption of Pb(II) can be well described by Freundlich isotherm models. The apparent surface complexation equilibrium constants (log K ) were obtained by fitting the batch experimental data using the PEST 13.0 together with PHREEQC 3.1.2 codes and there is good agreement between measured and predicted data. Distribution of Pb(II) surface species on the diatomite calculated by PHREEQC 3.1.2 program indicates that the impurity cations (e.g. Al 3+ , Fe 3+ , etc.) in the diatomite play a leading role in the Pb(II) adsorption and dominant formation of complexes and additional electrostatic interaction are the main adsorption mechanism of Pb(II) on the diatomite under weak acidic conditions.
研究领域:
环境科学
·
化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）