CRYSTAL RESEARCH AND TECHNOLOGY
·
2021
·Vol. 56
·期 8
·2100012
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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
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生物化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 36
·19333-19342
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IF 8.867
Long Kong,Zhichun Li,Xueqiong Huang,Shouqiang Huang,Hua Sun,Min Liu,Liang Li
Nanostructured metal sulfides hold great promise for adsorption and catalysis applications, but it remains challenging for them to achieve highly efficient decontamination and facile separation of heavy metal ions from water. Herein, Fe3S4/reduced graphene oxide composites (Fe3S4/rGO) were successfully prepared and utilized for the removal of Pb(II) from water. Uniform Fe3O4 nanoparticles were firstly dispersed on the rGO, and employed as sacrificial materials for a facile sulfuration approach. This gave rise to the fabrication of Fe3S4 nanoparticles (Fe3S4 NPs) with an average size of 14.3 nm. The resultant Fe3S4/rGO presented an evidently greater adsorption capacity (285.71 mg g−1) and advantages in driving fast adsorption of Pb(II) in comparison with Fe3O4/rGO (106.27 mg g−1). A remarkable selectivity for Pb(II) was achieved in the presence of coexisting cations and anions, and the addition of humic acid promoted the removal of Pb(II) by Fe3S4/rGO. The enhanced performance of Fe3S4/rGO was mostly facilitated by synergetic contributions of the strong and selective Pb–S interactions between Pb(II) and small Fe3S4 NPs associated with the surface adsorption. Remarkably, a single treatment of smelting wastewater with Fe3S4/rGO effectively reduced Pb(II) concentration below the drinking water standard that is recommended by the U.S. Environmental Protection Agency, along with a surprisingly high removal efficiency toward arsenic (96.18%). However, Fe3O4/rGO merely exhibited a low removal rate of 29.59% for Pb(II). The efficient removal performance of Fe3S4/rGO exhibited its great potential in the remediation of heavy metal polluted water via simultaneously taking advantage of magnetic properties and a high affinity for heavy metals.
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
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Yanjun Huang,Qingdi Kong,Xiaojie Zhang,Hong Peng
It is a challenging task to remove Pb(II) ions efficiently from wastewater containing high concentrations of hardness ions. In this study, a novel hybrid polymer (DVP) for selective adsorption of Pb(II) ions was successfully prepared via photopolymerization of vinyl-POSS and dimercaptosuccinic acid (DMSA). The chemical structure and composition of DVP were characterized by FTIR, XPS, SEM, TEM, XRD and TGA techniques. DVP exhibited high efficiency in removing Pb(II) from aqueous solutions with a maximum adsorption capacity of 349.5 mg g −1 at pH 4, exceeding lots of adsorbents reported in the literature. The adsorption performance of Pb(II) by DVP was found to fit the Freundlich isotherm well and its kinetics followed the Elovich model. Moreover, DVP showed selective adsorption of Pb(II) in the presence of high concentrations of Ca(II) and Mg(II) ions and could reduce Pb(II) in real lake water to 25 ppb at a DVP dose of 1 g L −1 . Moreover, the adsorption process of DVP was endothermic in nature. The adsorption mechanism demonstrated that Pb(II) ions can be chelated with the thioether and carboxyl groups of DVP simultaneously, which was confirmed by spectroscopic analysis and DFT calculations. Good reusability in continuous fixed-bed column experiments suggested that DVP was an ideal candidate for the selective removal of Pb(II) ions from contaminated aquatic systems.
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
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 23
·11158-11165
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IF 3.925
Jipeng Li,Yanzhi Sun,Yongmei Chen,Yang Tang,Junqing Pan,Pingyu Wan
In the present study, the preparation of a new MOF material His-MIL-53(Al) and its performance in the adsorption of Pb(II) from aqueous solution were investigated. The original material MIL-53(Al) was directly grafted with histidine to obtain the modified MOF material His-MIL-53(Al). The results show that His-MIL-53(Al) has excellent adsorption performance for Pb(II), and the adsorption process is in accordance with the pseudo first-order kinetics and the Langmuir adsorption model, with a maximum adsorption capacity of 50.13 mg g−1, which is much larger than the adsorption capacity of the original material MIL-53(Al). The experimental results also show that the prepared material has good recoverability. Our work demonstrates the applications of His-MIL-53(Al) as a promising material in the adsorption of heavy metals.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Guoping Wei,Junwen Qi,Peng Lin,Shunlong Pan,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang,Jiansheng Li
Porous matrix immobilization is considered as an effective approach to address the engineering challenges during practical application of nanoadsorbent. In this work, solid and hollow hydrous Zirconium (IV) oxide (ZrO 2 ·nH 2 O, SHZO and HHZO) nanoparticles were enwrapped into millimeter-level beads by polyethersulfone through a mild liquid-liquid phase inversion technique. The beads possess asymmetric and hierarchical structure with an exterior porous surface dense layer and numerous inner interpenetrating finger-like channels, which promote the transportation of molecule and prevent the leaching of nanoadsorbents. As compared to SHZO beads, HHZO beads exhibited higher efficient adsorption capacity toward Pb (II) (104 mg·g −1 ), which could remain at 94% of HHZO nanoparticles. The effects of pH, the stability of adsorbents and coexisting ionic are further explored in detail. The Pb (II) removal mechanism is further studied by the EDS mapping, XPS, FTIR measurements, further indicating the surface hydroxyl groups played a key role in the adsorption process. Fixed-bed column sorption experiment and in situ regeneration were conducted so as to examine the practical application of the beads. Therefore, this kind of beads indicated the potential practical application in industrial wastewater treatment.
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
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2021
·Vol. 30
·期 4
·1344-1354
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IF 3.667
Shen Jian,Jiang Fangyuan,Wang Nan,Ouyang Xiao–kun,Jin Mi-cong
Surface modification of cellulose nanocrystals (CNC) is essential for improving their reactivity and adsorption capacity. Oxidation, as a conventional modification method of CNC, has strong reaction conditions, which may partially destroy the structure of CNCs. Herein, we propose a mild cellulose modification method, in which diethylenetriaminepentaacetic acid (DPTA) was grafted onto CNC with an aminosilane coupling agent. To facilitate the enrichment and recovery of adsorbents, we prepared magnetic CNC before grafting DPTA, and finally obtained magnetic carboxylic functionalized CNC (MCNC-DPTA). The effects of the reaction parameters on the adsorption process were systematically studied by transmission electron microscopy, X-ray diffraction, Vibration sample magnetometry, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Additionally, the effects of the solution pH, the initial concentration of Pb, and the adsorption time on the adsorption properties of the materials were evaluated. Furthermore, the structure, morphology, and thermal properties of the solution were systematically studied. After 6 cycle tests, the adsorption amount of Pb(II) by MCNC-DPTA was only reduced by 7%. These results show that MCNC-DPTA is an environment-friendly adsorption material with an excellent Pb(II) removal effect.
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
WATER SCIENCE AND TECHNOLOGY
·
2019
·Vol. 80
·期 5
·989-997
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IF 1.624
Zeng Wen-Juan,Wang Cai-Yun,Wang Yu-Hui,Guo Hong-Mei,Huang Yu,Zhang Xiao-Liang
As a kind of earth-abundant and cheap natural clay mineral, palygorskite (Pal) was facilely modified by grafting with graphene oxide (GO) to fabricate GO/Pal composites for rapid removal of Pb(II) from aqueous solutions. The results of characterization confirmed that the GO/Pal composites were successfully grafted between GO sheets and Pal nanorods. The effects of pH, adsorbent dosage, adsorption time, initial Pb(II) concentration and temperature on the adsorption of Pb(II) onto the GO/Pal composites as adsorbents were systematically investigated. The maximum adsorption capacity over 106.6 mg/g was obtained within a short adsorption time of less than 1 h even at 298.15 K. The adsorption of Pb(II) was a fast process that more accurately followed the pseudo-second-order kinetic equation. This process also could be described better with the Langmuir equation model than the Freundlich model. The negative values of Δ G ° and the positive values of Δ H ° and Δ S ° indicated that it was a spontaneous, endothermic and entropy-increasing adsorption process. Compared with pristine Pal and GO powders, such the GO/Pal composites as a cost-efficient and eco-friendly adsorbents could significantly improve the adsorption properties of Pb(II) and would have potential application in the industrial wastewater treatment for rapid removal of Pb(II).
研究领域:
环境科学
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材料化学
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水处理技术
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DOI
高影响因子
Scientific Reports
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2026
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IF 4.9
Sikandar Anila,Zhao Jing,Ahmad Shakeel,Chu Gang,Pan Bo,Chang Zhaofeng,Liu Yang,Wu Danping,Rashid Audil
Biochar (BC) has been widely used for the lead (Pb(II)) immobilization in soil remediation. However, the mechanisms of dissolution-driven removal of Pb(II) by BC are still poorly understood. Herein, Pb(II) removal was investigated by differentiating BC- and dissolved organic carbon (DOC)-systems. As per the kinetics and isotherms, Pb(II) removal ranged from 31.11% to 80.92% in BC-system. This removal process was significantly influenced by dissolution-driven precipitation which contributed from 23.42% to 84.03% in DOC-system. During Pb(II) removal, an obvious reduction was observed in the released inorganic anions including carbonate (CO 3 2− ), sulfate (SO 4 2− ), and phosphate (PO 4 3− ). The CO 3 2− was a predominant contributor to facilitate Pb(II) precipitation. X-ray diffraction further confirmed the formation of cerussite (PbCO 3 ) and anglesite (PbSO 4 ) on BC surface after Pb(II) removal. Moreover, the decreased fluorescence responses of humic-like and fulvic-like substances were detected in DOC-system with the addition of Pb(II). At the same anion concentration, the enhanced Pb(II) amount was removed with increasing DOC concentration from 1 mg·L − 1 to 5 mg·L − 1 . These results indicated that released DOC exerted a significant contribution on Pb(II) precipitation due to its coagulation effect. This research provides mechanistic insights into the contributions of adsorption and dissolution-driven precipitation in overall Pb(II) removal through BC application.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Haiyan Wu,Liubing Ling,Ting Wang,Kun Dong,Yufeng Xu,Guo Yu,Yanwu Wang,Dunqiu Wang
Persistent Pb(II) ions in soils and aquatic systems diminish soil fertility, degrade water quality, and destabilise ecosystems. Hydroxyapatite nanowires (HAPNWs) are promising adsorbents owing to their chemical stability, biocompatibility, and strong affinity for heavy metals. This study evaluates HAPNWs hydrothermally synthesised between 0°C and 55°C, correlates temperature-induced structural variations with adsorption performance, and elucidates the stepwise Pb(II) uptake pathway. Nanowires synthesised at 35°C displayed the highest aspect ratio and achieved the greatest equilibrium adsorption capacity. The sorption kinetics followed a pseudo-second-order model, whereas the equilibrium data were best described by the Freundlich isotherm. Multi-technique characterisation revealed a two-stage uptake mechanism. Stage I, outer-sphere complexation, involves rapid binding of Pb 2+ to surface -PO 4 and -OH groups via electrostatic interactions without disturbing the apatite lattice. Stage II, near-surface ion exchange accompanied by incipient dissolution-reprecipitation, occurs under continued loading: surface Ca 2+ is partially replaced by Pb 2+ , and Pb 10 (PO 4 ) 6 (OH) 2 nuclei start to form on the HAP surface, progressively reducing active-site availability. Competitive sorption tests demonstrated a pronounced Pb 2+ preference. In equimolar quinary solutions (Pb, Cu, Cd, Zn, Ni), the selectivity sequence was Pb > Cu > Cd > Zn > Ni. The strongest inhibition appeared in the binary Pb-Cu system, where uptake decreased to approximately 40% of the single-ion value, indicating direct competition for identical surface sites. By elucidating the temperature-dependent relationship between structure, mechanism, and performance, this work provides both theoretical insights and a methodological framework for the rational design of high-performance adsorbents for heavy metal remediation in complex environmental systems.
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2016
·Vol. 29
·期 5
·607-616
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IF 0.496
Gong Cheng-yun,Geng Zhi-gang,Dong An-le,Ye Xin-xin,Wang Guo-zhong,Zhang Yun-xia
A facile one-step co-precipitation method was demonstrated to fabricate amorphous sulfur-containing calcium phosphate (SCP) nanoparticles, in which the sulfur group was in-situ introduced into calcium phosphate. The resulting SCP exhibited a noticeable enhanced performance for Pb(II) removal in comparison with hydroxyapatite (HAP), being capable of easily reducing 20 ppm of Pb(II) to below the acceptable standard for drinking water within less than 10 min. Remarkably, the saturated removal capacities of Pb(II) on SCP were as high as 1720.57 mg/g calculated by the Langmuir isotherm model, exceeding largely that of the previously reported absorbents. Significantly, SCP displayed highly selective removal ability toward Pb(II) ions in the presence of the competing metal ions (Ni(II), Co(II), Zn(II), and Cd(II)). Further investigations indicated that such ultra-high removal efficiency and preferable affinity of Pb(II) ions on SCP may be reasonably ascribed to the formation of rod-like hydroxypyromorphite crystals on the surface of SCP via dissolution-precipitation and ion exchange reactions, accompanied by the presence of lead sulfide precipitates. High removal efficiency, fast removal kinetics and excellent selectivity toward Pb(II) made the obtained SCP material an ideal candidate for Pb(II) ions decontamination in practical application.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Dawei Xiang,Hao Wang,Shixing Wang,Manying Zhu,Yuefeng Chen,Xiang Liu,Ping Li,Likang Fu
Covalent organic frameworks (COFs) are very promising adsorbent developed during recent years. Here, a COFs adsorbent (COF@HPLC) for efficient adsorption of lead is designed by post-modification. The adsorption properties were studied by batch adsorption. It is shown that pH 4 is the optimum value for the adsorption of Pb(II) by COF@HPLC. When the temperature is 25 °C, the maximum adsorption capacity of COF@HPLC reaches 251.37 mg/g. The fitting results of adsorption isotherm indicate that the process is a non-uniform adsorption in a single molecular layer . The activation energy fitted by the Dubinin-Radushkevich model are 16.22 kJ/mol, 21.32 kJ/mol, 18.87 kJ/mol and 16.67 kJ/mol, showing that Pb(II) adsorption by COF@HPLC is a chemical reaction. Kinetic studies show also that Pb(II) adsorption is a chemically controlled process. Thermodynamic shows that the adsorption is a spontaneously exothermic process. Finally, COF@HPLC has good adsorption selectivity and reusability. The adsorption mechanism of Pb(II) by COF@HPLC was the electrostatic and chelating interaction between functional groups containing sulphide and nitrogen and Pb(II) based on the zeta potential , XPS and DFT analyses. This work offers guidance toward the design and preparation of functional adsorbents for the treatment and removal of Pb(II).
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fuyang Huang,Jing Lin,Bin Wang,Quan Long,Weiguo Tu
Biochar was used to enrobe artificially synthesized mordenite by co-pyrolysis, and the performance of the composite in removing lead from dilute solutions was compared with that of the mordenite alone. The optimal parameters for the hydrothermal synthesis of mordenite were as follows: crystallization temperature of 180℃, crystallization time of 4 days, pH value of 11, and aging time of 24 h. The optimal mass ratio of mordenite to biochar was 20:1, and the pyrolysis temperature was 500℃. Adsorption equilibrium was reached within 3 h, yielding a total average lead removal of 78.9 % for mordenite alone and 98.6 % for the composite. Pseudo-second-order kinetics and Langmuir isotherms adequately described the data. The predicted maximum adsorption capacities were 156.6 mg/g for the mordenite alone and 283.4 mg/g for the composite. When the initial concentration of Pb(Ⅱ) was 80 mg/L, the optimum doses were determined to be 6–7 g/L for the mordenite and 5–6 g/L for the composite. At pH less than 7, mordenite removed up to 80 % of the lead and the composite removed between 90 % and 100 %. Coexisting ions had little effect on mordenite, but K(I), Ca(II), and Mg(II) could significantly increase the adsorption efficiency by up to 5.7 % for the composite. Furthermore, tannic acid and fulvic acid showed a promoting effect. Adsorption mechanisms were proposed based on the characterization results of the materials before and after adsorption, batch experiments, and density functional theory calculations. Specifically, mordenite adsorption was found to be based primarily on electrostatic attraction, surface complexation and ion exchange. Adsorption by the composite also involved π-electronic interaction and coprecipitation. In general, the composite exhibited better adsorption performance than mordenite alone.
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
危险品化学品经营许可证（带存储）