APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Yuxin Xu,Yu Li,Guixin Wang,Meiling Zhang,Xiongxin Peng,Fan Yang,Kui Cheng
The effective mitigation of the environmental impact of heavy metal remains a significant scientific challenge. In this study, a novel and environmentally friendly approach has been proposed to fabricate three-dimensional (3D) functional composite materials for Pb(II) removal. The easy-to-recycle spherical adsorbent is prepared by the dual utilization of sodium alginate (SA) as a bio-source precursor for the synthesis of carbon dots (CDs) and as a natural framework for the formation of SA hydrogel. The abundant surface-active groups on the SA hydrogel not only provide additional adsorption sites for the aggregation of heavy metal ions but can also be readily cross-linked with CDs without chemical additives, and thereby offering a 3D porous structure for chelating metal ions. The resulting HL-5CDs adsorbent demonstrates an impressive adsorption capacity of 305.21 mg·g −1 for Pb(II). The adsorption mechanism involves both chemical reaction and diffusion, leveraging the porous structure and rich oxygen groups of the material. Notably, a pot experiment revealed that the as-prepared HL-5CDs could inhibit the bioavailability of Pb(II). This study introduces a green and straightforward method for creating high-performance adsorbents, showcasing potential applications in energy, cleaning, and the remediation of wastewater pollution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Wei Wang,Yilong Hua,Shaolin Li,Weile Yan,Wei-xian Zhang
A common concern in the approval of nanotechnology for water treatment is whether there are advantages of these nanomaterials over conventional water treatment reagents. In this work, nanoscale zero-valent iron (nZVI) is compared with lime (Ca(OH) 2 ), the most widely used heavy metal precipitant, for Pb(II) and Zn(II) removal, in laboratory and field experiments. Water chemistry, treatment efficiencies and reaction products of the two reagents are compared and the study shows that the moderate solution pH of nZVI and its seed effect play vital roles in producing high-quality effluents. The results are then verified in a field continuous-flow experiment using tons of lime and kilos of nZVI. The results show that sub-ppm levels (∼0.1 mg/L) of Pb(II) and Zn(II) could not be achieved via lime precipitation alone, due to the solubility limits of metal hydroxides and their re-dissolution caused by the strong alkalinity of lime. In comparison, stable and lower levels of Pb(II) and Zn(II) were easily attained using nZVI, due to its multifunctional properties and good tolerance for influent fluctuation enabled by its inherent pH-stabilizing nature. SEM characterizations, particle size analyses and quiescent settling experiments show the ability of nZVI to generate large and consolidated solids that are amenable to gravitational separation. The study shows several key advantages of nZVI over lime technology in Pb(II) and Zn(II) removal. As lime is widely used for heavy metal removal, this work provides an effective advanced treatment process to supplement lime-based treatment methods.
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
FOOD CONTROL
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2021
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IF 5.548
Weixia Yang,Jinmeng Wang,Yong Han,Xueli Luo,Wenzhi Tang,Tianli Yue,Zhonghong Li
Pb(II), a highly toxic heavy metals that targets the human nervous system, has contaminated water and food in recent years. The nanomaterial of Metal–organic frameworks (MOFs) possesses superior removal performances. However, their practical application is limited by their nature of fine powdery. Herein, we developed robust MOFs film without the adding of polymer in MOFs ink and the modification of the substrate, which was achieved by choosing appropriate substrate of gelatin hydrogel with functional groups and simple thermal-treatment after coating UiO-66-NO 2 onto gelatin hydrogel. The volatilization of the UiO-66-NO 2 dispersant ethyl acetate promotes the rearrangement and dense accumulation of UiO-66-NO 2 crystals to form a dense UiO-66-NO 2 film. During the following thermal-treatment process, –COOH of UiO-66-NO 2 and –NH 2 of gelatin chemically reacted to establish the stable composites of UiO-66-NO 2 film and gelatin hydrogel. The results of batch adsorption experiments demonstrate that adsorption behaviors of the as-synthesized gelatin/UiO-66-NO 2 film composite hydrogels can be explained by the pseudo-second-order kinetic model and the Langmuir isotherm model, stating that this adsorption process involves with a chemical monolayer adsorption. Besides, gelatin/UiO-66-NO 2 film composite hydrogels own satisfactory removal efficiency for Pb(II) in apple juice, and the adsorption process has little impairment on the quality of apple juice. These results suggest that MOFs film is suitable for water decontamination and food safety control fields.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2022
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IF 2.799
Qingxia Ye,Zhen Li,Jin Liu,Di Wang,Ping Wang,Xianbiao Wang,Xianhai Hu
In this paper, the application of zone smelting to remove the trace heavy metal lead from waste acrylonitrile-butadiene-styrene (wABS) plastics was investigated. ABS standard samples with uniform and stable lead content were prepared by the method of lead stearate coupling agent. The structure, thermal stability, morphology and lead content of the standard ABS samples before and after zone smelting were characterized by FTIR, DSC, SEM and ICP-AES. The results showed that the lead content in the front and middle sections of the ABS sample decreased obviously after zone smelting, while the lead content in the tail increased significantly, and the structure, thermal stability and morphology remained basically unchanged.
研究领域:
材料科学
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环境工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2021
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IF 2.475
Mei Wang,Jing Huang,Dailian Zhu,Deyou Yu,Peng Ye,Minghua Wu,Kemei Pei,Yanrong Jia,Huagang Ni
The nitrogen-doped porous carbon was prepared by direct carbonization of pyrrole functional crosslinked lignosulfonates precursors via Friedel-Crafts alkylation reaction, and studied for the removal of Pb(II) from water. The absorbent showed higher adsorption capacity which reached 102.77 mg/g when the initial Pb(II) concentration was 200 mg/L and the dosage was 1 mg/mL. Chemical interactions drive the adsorption and the calculated Qmax was 157.9 mg/g according to the Langmuir isotherm model. Such easily separated porous carbon with higher uptake capacity and excellent reusability could be a promising material for mitigation Pb(II) ions pollution just prepared from by-production from the paper industry.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2019
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IF 0
Sefiu A. Rasaki,Tiju Thomas,Minghui Yang
Due to high surface area and large pore volume, nanostructure zinc oxides/its composites have gained a lot of research interests for heavy metal removal from water. Low stability of the ZnO at low and high pH is however a problem. In this work, ZnO@MgO, ZnO and MgO are synthesized via co-precipitation, followed by calcinations. The samples show remarkable removal of Pb(II) from water when compared to commercial samples; the best results is obtained using ZnO@MgO which exhibit adsorption capacity of 250 mg g −1 equivalent to 100% removal capacity. The optimum removal capacity is retained in a wide range of pH (i.e. pH 6–9) at temperature 30 °C. Low adsorption capacity coupled with low stability in acidic condition; a problem associated with ZnO-based adsorbents when it is being used for the removal of heavy metals from water/wastewater; often prevents this system from being practically used; is overcome here. The ZnO@MgO adsorbent shows chemical stability over wide range of pH(2–9). The adsorption is chemisorptive in nature, endothermic and evidently aided by high surface heterogeneity (△H° ˜25 kJ mol-1 and △S°˜110.6 J mol −1 K −1 ). Appreciable adsorption capacity over wide range of pH-value, high recovery and reusability results from nanosphere morphology of the composite sample; all these novel properties are attributed to the strong electronic coupling effect between MgO and ZnO. This work is expected to spur further research on ZnO-based composite materials in allied areas, including (i) mitigation of atmospheric pollution and (ii) water treatment processes.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xuejiao Liu,Beibei Pan,Zhiwei Li,Poonnawit Hanphaiboon,Yin Wang
Activated carbon supported nanoscale zero-valent iron (NZVI/AC) has been proved to be versatile for removing several kinds of contaminants from environmental matrix. The structural properties of NZVI/AC composites play a crucial role in determining both the decontamination efficiency and adsorption capacity of these materials. However, studies relevant to structural evolution and corresponding manipulation routes for AC-supported NZVI are still scarce. Herein, AC-supported NZVI were prepared under different synthesis conditions followed by characterizing them using several techniques and evaluating their reactivity toward heavy metal in aqueous solution. NZVI/AC synthesized under different molecular weight of PEG and m AC :m Fe possessed a similar removal efficiencies of Pb(II) from aqueous solution, meanwhile, NZVI/AC synthesized with a suitably prolonged time at n BH4 :n Fe = 8.0 exhibited obvious enhancement for Pb(II) removal from aqueous solution. As for structural evolution of AC-supported NZVI, results show that the crystallization was more complete, the shape was converted from needle to sphere, the particle size was becoming smaller, the particle distribution was more homogeneous, the specific surface area was smaller, and the surface oxidation was lower as suitably increasing m AC :m Fe , n BH4 :n Fe , and reaction time. The size and density of iron precursor by complexation of PEG and Fe 2+ , and ratio of nuclei formation to growth values are essentially responsible for manipulating structure of AC-supported NZVI. Spherical AC-supported NZVI with higher iron content based on smaller particle size, uniform distribution, and lower surface oxidation in one is responsible for significant enhancement of Pb(II) removal rate and capacity thanks to higher surface reactivity, more accessible surface-active sites, and faster electron transfer from core to shell of iron. This study would provide a new insight into comprehending manipulation mechanism for the key structure of AC-supported NZVI composites for aquatic remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
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2024
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IF 4.8
Lining Yu,Huazhen Cao,Huibin Zhang,Junfeng Kong,Weilun Qian,Anyang Tang,Wenyu Feng,Guoqu Zheng
Owing to the characteristics of mineral paragenesis (equilibrium sequence of mineral phases), the hydrochloric acid leach liquors of Sn ores and Sn-containing waste materials typically contain large amounts of Pb. In this study, barium sulfate coprecipitation was employed to efficiently remove Pb from a tin chloride solution. The lead removal efficiency, reaction mechanism, and limitations were investigated by varying the Cl − and SO 4 2− concentrations. The results showed that the structural formula of the precipitates was (Ba x Pb y )(SO 4 ) 2 (x + y = 2), and its solubility product was in the range of 1 × 10 −12 –1 × 10 −13 , indicating that Pb 2+ and Ba 2+ were more easily precipitated in the form of complex salts. In addition, thermodynamic analysis revealed that when the Cl − concentration was <1 mol/L in the Pb 2+ –Sn 2+ –Cl − –H 2 O system, [Pb 2+ ] and [PbCl + ] were the primary species. These positively charged species were readily adsorbed onto the surface of BaSO 4 via electrostatic forces, resulting in a significant increase in the Pb content of (Ba x Pb y )(SO 4 ) 2 . Therefore, the Pb removal efficiency significantly improved as Cl − concentration decreased. The lead removal mechanism involves a combination of adsorption and replacement processes. Based on the aforementioned fundamental study, a method involving dechlorination and coprecipitation was proposed to remove lead from an acid leaching solution of Kaldo slag. With the dechlorination via distillation, the Pb removal efficiency could reach 99.9% at 1 mol/L Cl − and 0.5 mol/L SO 4 2− .
研究领域:
冶金工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
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IF 6.789
Jing Nie,Qiming Wang,Shengya Gao,Chi Sun Poon,Yaoyu Zhou,Jiang-shan Li
With rapid economic growth and urbanisation, the reuse and recycling of solid wastes has become a high priority for the sustainable development of modern cities. In this study, two typical solid wastes, incinerated sewage sludge ash (ISSA) and waste bentonite , were co-valorised to produce granular adsorbents through a simple and energy-saving pelletisation/sintering process. A mixture of ISSA and bentonite at a weight ratio of 3:1 was pelletised and sintered at 700 °C. The resultant ceramsite, with good mechanical strength, could effectively remove Pb(Ⅱ) from aqueous solutions. The adsorption kinetics can be described by the pseudo-first-order (PFO) model. The results indicated that the Pb(Ⅱ) adsorption process was dominated by electrostatic attraction , precipitation, and complexation. The isothermal data exhibited a good correlation with the Freundlich model, indicating that the adsorption process was non-ideal and spontaneous. The maximum adsorption capacity was approximately 21.6 ± 0.35 mg/g at 318 K. After 5 cycles of regeneration, the adsorbent maintained good adsorption performance. Moreover, the removal rate was not greatly affected by ionic strength . These findings demonstrate that the granular adsorbent prepared with ISSA and waste bentonite can be recognised as a promising adsorbent for Pb-containing wastewater treatment .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Tao Jian,Yongjin Fang,Xiang Cai,Mingyi Ying,Bisheng Li,Wangyang Ye,Liguo Shen,Leihong Zhao,Hongjun Lin
The development of high-performance membranes for heavy metal remediation remains a key challenge in advanced water treatment. In this work, a hierarchically structured composite membrane was fabricated via a self-confined growth strategy, in which Zn(OH) 2 nanostrands immobilized MoS 2 and directed the in-situ growth of ZIF-8, forming a defect-free interlayer for robust polyamide (PA) deposition. The resulting ZM15-PA membrane exhibits a highly hydrophilic surface with a contact angle of 31.5°, a strong positive surface charge under acidic conditions, and excellent water permeability reaching 83.5 L m -2 h -1 . Most notably, the membrane achieves an ultrahigh Pb(II) rejection rate of 99.2%, consistently reducing effluent concentrations to less than 10 μg L -1 , even in the presence of coexisting ions and dissolved organic matter. Mechanistic investigations reveal that Pb(II) removal is governed by synergistic mechanisms including electrostatic repulsion, molecular sieving, and coordination interactions involving Pb-S, Pb-O, and Pb-N bonds. Furthermore, the membrane demonstrates outstanding antifouling resistance, long-term operational stability, and antibacterial efficiency exceeding 99% under photo-Fenton conditions. These findings highlight the promise of self-confined growth strategies for stabilizing two-dimensional materials and developing multifunctional membranes for selective heavy metal removal in complex water matrices.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Yanhong Zhang,Yuefeng Feng,Qi Xiang,Fuqiang Liu,Chen Ling,Fenghe Wang,Yan Li,Aimin Li
The development of high efficiency filter membranes, particularly those capable of removing trace heavy metals from drinking water sources, is a global challenge. In this study, a dual-functional membrane (P m G n @PVDF) was successfully developed by doping graphene oxide (GO) and then depositing polydopamine (PDA). The pure water flux (Jw) was 188 LMH/bar and Pb(II) could be effectively removed in the water volume of 2106.36 L m −2 . Both PDA and GO performed positive functions. PDA layer exhibited a high affinity toward Pb(II) by chelating with amino groups. And doping GO maintained a high pure water flux, which had been decreased by the extra PDA layer. In addition, the effective treatment volume of Pb(II) was elevated to 5029.06 L/m 2 by the co-existence of citric acid, since neutral PbHL coordinated with neutral NH 2 and cationic PbL- interacted with NH 3 + through electrostatic attraction. Furthermore, P m G n @PVDF showed the excellent anti-interference performance in high salt and nature organic matters solutions. Thus, this novel dual-functional membrane could be considered as a competitive alternative of NF/RO for the efficient and advanced removal towards heavy metals from natural water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
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2024
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IF 9.7
Yim Yu Stephanie Kong,Qiming Wang,Jian-Xin Lu,Chi Sun Poon
Solid wastes, including incinerated sewage sludge ash (ISSA), waste bentonite, and waste glass powder (WGP), were recycled and sintered at a low temperature (680 °C) to produce lightweight aggregates (WSA). WGP acted as a fluxing agent to significantly lower sintering temperature of 1000–1200 °C in other studies. WSA demonstrated an excellent mechanical strength of 3.76 MPa. The adsorbent dosage, initial pH, kinetics and isotherm on heavy metals adsorption were evaluated in batch adsorption experiments. The isothermal data exhibited a good correlation with the Langmuir model, and the maximum adsorption capacity was approximately 9.26 mg/g at 296 K. Pb(II) removal was dominated by precipitation and cation exchange. Breakthrough curves were determined for fixed-bed adsorption. At 50% breakthrough, the maximum adsorption capacity was 1.82 mg/g. The WSA after heavy metals adsorption were then reused to replace river sand (10–50%) in producing lightweight mortars. The solidification of spent WSA in the lightweight mortars could significantly reduce the leaching of Pb(II) by 98.5%. Moreover, the reuse of spent WSA resulted in low density and low thermal conductivity of cement mortars. This study demonstrates total waste management for municipal solid wastes: upcycling of waste–utilization–permanently stored as construction materials.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）