COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Hongqiang Li,Shunxing Mu,Xiaoqing Weng,Yunliang Zhao,Shaoxian Song
The adsorption of Pb 2+ at the rutile/water interface has been studied for the activation of rutile flotation with salicyl hydroxamic acid (SHA) as a collector in this work. This study was performed through measurement of the zeta potential, adsorption capacity, calorimetry and X-ray photoelectron spectroscopy. The experimental results showed that the adsorption of SHA on rutile and the flotability of rutile were significantly improved by the addition of Pb 2+ . This improvement was attributed to the specific adsorption of Pb 2+ in the form of PbOH + , which interacted with the Ti-OH at the rutile surface and formed a surface Ti-O-Pb + complex. This adsorption followed the Langmuir model. It reversed the zeta potential sign of rutile at pH 5.5⿿6.8 and had a heat of adsorption of ⿿46.71 kJ/mol, suggesting the occurrence of a chemiosorptive process.
研究领域:
矿物加工工程
·
物理化学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 7
·1-10
·
IF 2.426
Li Paiwei,Dai Xin,Yan Qilin,Wang Zhenxi,Zhang Shangxi,Cao Meng
Dithizone is known to be very effective for heavy metal ions retention and widely used as developer in detection methods. To explore a novel surface modified polymer microspheres, this paper prepared a novel modified polystyrene (PS-g-D) microspheres by grafting dithizone as the complexing agent and developer on the surface of PS microspheres. The structure of PS-g-D was analyzed by FT-IR, and the formation of dithizone grafted PS microspheres was proved. The thermal stability and surface morphology of PS and modified PS were studied by TGA and SEM. PS-g-D had a uniform diameter of about 1 μm and exhibited a good thermal stability. The Pb 2+ removal increased and reached up to 99% with the decrease of initial Pb 2+ concentrations. The study of the isotherms model showed that the adsorption between PS-g-D and Pb 2+ is consistent with the Langmuir and Temkin adsorption isotherm models. The adsorption kinetics of PS-g-D is described well by the pseudo-second-order model. It can be seen that the modified PS microspheres exhibit a good adsorption property, and has real potential as a novel adsorbent for water treatment industry due to the introduction of dithizone as complexing agent and developer.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2024
·
IF 4.3
Jingyu Cai,Junjie Shi,Jian Zhang,Xiaoyu Miao,Sen Wang,Longqiang Xiao,Dan Liu,Linxi Hou
Electronic-grade isopropyl alcohol is widely utilized in the cleaning of semiconductors and microelectronic components. Removing ions like Pb2+ is crucial since the presence of impurities may cause degradation of electronics, increased failure rates, and short circuits. Membrane materials offer a number of advantages in the field of adsorption separation; however, the lack of adsorption sites results in limited adsorption capacity. In the current work, guanidino-grafted NH2-MIL-101(Fe) was incorporated into polyvinylidene fluoride (PVDF) to prepare MOF/PVDF mixed matrix membranes (NM/PVDF) for the removal of Pb2+ from isopropanol. Benefiting from the larger specific surface area and more lone electron pairs in the guanidine group, the Pb2+ adsorption capacity of the as-prepared NM/PVDF membrane was 29.4458 mg/g, which was higher than that of the NH2-MIL-101(Fe)/PVDF membrane (20.9306 mg/g) and the pure PVDF membrane (6.7324 mg/g). The NM/PVDF membrane was able to reduce the concentration of Pb2+ from 500 to 86.73 ppb. This work highlights the potential of guanidine-grafted Fe-based MOFs/PVDF membranes as adsorbents for acquisition of electronic-grade solvents.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yingying Fang,Wenbo Zhou,Yihuan Cheng,Yuge Zhang,Tingting Yu,Shaoxian Song
The high-value utilization of steel pickling waste liquid (SPWL) is an important direction in the resourceful utilization of hazardous waste. In this study, nano-Fe 3 O 4 prepared from SPWL (S-Fe 3 O 4 ) was hydrothermally compounded with MnO 2 as Fe 3 O 4 -MnO 2 (SFM), which were compared with Fe 3 O 4 -MnO 2 (CFM) prepared by chemical reagents. The synthetic materials were evaluated by SEM, VSM, BET, XRD, and zeta potential, the results show that the spherical S-Fe 3 O 4 was encapsulated by spiny spherical shell-like MnO 2 , and the SFM has a high saturation magnetization and specific surface area (159.91 m 2 /g). The adsorption experiments demonstrated that the adsorption effect of SFM on Pb 2+ is highly similar to that of CFM. The maximal adsorption capacity of SFM reached 129.74 mg/g under ideal composite ratio and pH conditions, and the adsorption process was unaffected by competing heavy metal ions coexisting in the environment. Moreover, the high saturation magnetization strength of the SFM makes it simple to separate materials under a magnetic field. The pseudo-second-order kinetics and Langmuir isotherm models provided a good description of the Pb 2+ adsorption on SFM. XPS and FTIR analysis provided evidence that the adsorbent surface has a high concentration of -OH functional groups, and that O atoms serve as Pb 2+ binding sites, suggesting that ion exchange occurs during the SFM adsorption process. In this paper, we developed a cheap SFM with high adsorption performance and provided a novel approach to the high-value application of SPWL.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yaqin Rong,Wenjun Yan,Zhongde Wang,Xiaogang Hao,Guoqing Guan
The slow accumulation of heavy metal in the sediment and aquatic food chain, leads to extremely bad health influence in human body. Most of the traditional adsorption materials have deficient adsorption capacity and selectivity. In this research, the TiO 2 /PANI composite material is synthesized successfully by intercalating 2HT (intercalating agent) and PANI into the interlayer of the TiO 2 nanosheet for the separation of Pb 2+ . During this synthesis process, the layer spacing of TiO 2 /PANI can be controlled precisely by adjusting the concentration of 2HT and PANI. The rapid Pb 2+ uptake/ release process is triggered through turning the redox states of composite film which can leads to the conversion between Ti 4+ and Ti 3+ and the conversion between –OH and -O-Pb covalent bond for maintaining the electrical neutrality. In addition, the directional H + proton migration, fast electronic transporting network and superfast Pb 2+ ion transport path both are benefit for the transmission and uptake of Pb 2+ . As a result, this composite film illustrates ultrahigh uptake capacity (1499.99 mg∙g −1 ) and selectivity (K D = 15.2 L·g −1 ). It can even treat real wastewater to a level lower than WHO. Hence, this composite film with superior electrochemical performance is a promising material, which could be used for uptake/release of Pb 2+ .
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
Journal of the Taiwan Institute of Chemical Engineers
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2018
·
IF 3.849
Shuangzhen Guo,Ning Duan,Zhigang Dan,Fuyuan Xu,Chenmu Zhang,Feifei Shi,Wubin Gao
Three-Dimensional magnetic nanocomposite (Fe 3 O 4 @g-C 3 N 4 ) was first prepared and used to removal Pb 2+ from aqueous solution by adsorption method. Various of techniques were used to character Fe 3 O 4 @g-C 3 N 4 such as scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and thermo-gravimetric analyzer (TGA). Batch experiments with different pH, initial concentration, contact time and ionic strength were used to evaluate the adsorption performance of Fe 3 O 4 @g-C 3 N 4 . The adsorption kinetics data followed pseudo-second-order model. The isothermal adsorption equilibrium data were best described by Langmuir model and predicated adsorption capacity was 423.73 mg g −1 for Pb 2+ . The result of X-ray photoelectron spectroscopy (XPS) survey spectrum suggested that the main adsorption mechanism of Fe 3 O 4 @g-C 3 N 4 for Pb 2+ is the coordination between conjugated π-electron pairs of heptazine (C 6 N 7 ) units or triazine ring (C 3 N 3 ) units and sp 2 C N with metal ions. By comparing the adsorption capacities of Fe 3 O 4 , g-C 3 N 4 and Fe 3 O 4 @g-C 3 N 4 , it can be found that the adsorption capacity of g-C 3 N 4 would increase by increasing the layer spacing. Fe 3 O 4 @g-C 3 N 4 could be regenerated by HNO 3 and the adsorption capacity of regenerative Fe 3 O 4 @g-C 3 N 4 could maintain 89.3% after five cycles. The adsorption capacity of Fe 3 O 4 @g-C 3 N 4 for Pb 2+ is 121.42 mg g −1 in acid electrolytic zinc residue percolate. Therefore, the Fe 3 O 4 @g-C 3 N 4 is a potential adsorbent for removing Pb 2+ from 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
MOLECULES
·
2024
·Vol. 29
·期 7
·1595
·
IF 4.2
Jingyu Zhao,Yuhong Qin,Yue Liu,Yunlong Shi,Qiang Lin,Miao Cai,Zhenya Jia,Changjiang Yu,Anqi Shang,Yuxiao Fei,Jiayi Zhang
The performance of nano-zero-valent iron for heavy metal remediation can be enhanced via incorporation into bimetallic carbon composites. However, few economical and green approaches are available for preparing bimetallic composite materials. In this study, novel Co/Fe bimetallic biochar composites (BC@Co/Fe-X, where X = 5 or 10 represents the CoCl2concentration of 0.05 or 0.1 mol L−1) were prepared for the adsorption of Pb2+. The effect of the concentration of cross-linked metal ions on Pb2+adsorption was investigated, with the composite prepared using 0.05 mol L−1Co2+(BC@Co/Fe-5) exhibiting the highest adsorption performance. Various factors, including the adsorption period, Pb2+concentration, and pH, affected the adsorption of Pb2+by BC@Co/Fe-5. Further characterisation of BC@Co/Fe-5 before and after Pb2+adsorption using methods such as X-ray diffraction and X-ray photoelectron spectroscopy suggested that the Pb2+adsorption mechanism involved (i) Pb2+reduction to Pb0by Co/Fe, (ii) Co/Fe corrosion to generate Fe2+and fix Pb2+in the form of PbO, and (iii) Pb2+adsorption by Co/Fe biochar. Notably, BC@Co/Fe-5 exhibited excellent remediation performance in simulated Pb2+-contaminated water and soil with good recyclability.
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
Polymer Chemistry
·
2014
·Vol. 5
·期 14
·4332-4338
·
IF 5.368
Feng Wang,Liyan Huang,Jun Li,Lina Lin,Zhengping Liu,Zhaoxia Dong
Well-defined superparamagnetic and conductive Fe3O4/polyaniline (PANI) hollow spheres were fabricated using positively charged polystyrene (PS) spheres as templates. The negatively charged Fe3O4 particles, which were decorated by citric acid, can be attached onto the surface of the PS spheres via electrostatic interaction. Subsequently, the PANI layer was coated onto the PS/Fe3O4 templates by in situ chemical oxidative polymerization. Finally, removal of the PS core by dissolving with tetrahydrofuran provided the electromagnetic hollow spheres. Morphologies and compositions of Fe3O4/PANI hollow spheres were investigated by using SEM, TEM, FTIR and XRD. Magnetic analysis demonstrates that the synthesized composite spheres possess the characteristic of superparamagnetism and the saturation magnetization value is 26.2 emu g−1. Batch adsorption shows that the Fe3O4/PANI hollow spheres exhibit high uptake property of Pb2+ in aqueous solution. The adsorption kinetics follows the mechanism of pseudo-second-order kinetics and the sorption agrees well with the Langmuir isotherm.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Chunxiao Wu,Sha Zhang,Jin Zhong Zhang,Yan Li
Water contamination from industrial activities has been a major problem throughout the world. Typically, lead ions (Pb2+) are recognized as a persistent contaminant posing a great threat to our environment and human health, which urgently needs to be solved. Adsorption is one of the most effective ways to solve it. MXenes show great potential for applications in the fields of adsorption due to their large specific surface area, excellent hydrophilicity, and structural stability. In this work, a series of V2CTx MXenes including multilayered V2CTx MXene (M-V2C), alkalized V2CTx MXene (A-V2C), and single-layer V2CTx MXene (S-V2C) were prepared by an etching method to apply for Pb2+ adsorption. Compared to M-V2C and A-V2C, S-V2C not only had the highest adsorption efficiency under the same conditions but also exhibited a wide pH adsorption ability in the range of 1–14, which cannot be achieved by other adsorbents. In addition, it showed great cycle performance after 10 cycles and selective adsorption of Pb2+ in the presence of other ions. Factors affecting the Pb2+ adsorption capacity of V2C and related mechanisms were also thoroughly investigated. This work demonstrates for the first time that S-V2C is a novel adsorbent material with excellent pH tolerance, regeneration performance, and selective adsorption ability, which shed bright light on the related applications.
研究领域:
环境科学
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材料科学
·
水处理
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Rui-hong Liang,Ya Li,Li Huang,Xue-dong Wang,Xiao-xue Hu,Cheng-mei Liu,Ming-shun Chen,Jun Chen
Ethylenediamine-modified pectins (EPs) with different degrees of amidation (DA) were prepared and characterized by Fourier Transform Infrared spectra (FTIR), elemental analysis, X-ray photoelectron spectroscopy (XPS). The prepared EPs were then used to remove Pb 2+ from the aqueous solution. It was found that EPs with the highest DA (EP 48 ) exhibited great removal efficiency of Pb 2+ (≥94 %) at low concentrations of 40−80 mg/L. The zeta potential analysis showed that EP 48 had the fastest increase in zeta potential when Pb 2+ was continuously added and was the first to be electroneutralized. Particle size analysis further confirmed that EP 48 was the first precipitated and formed a larger EP 48 -Pb 2+ complex. The FTIR and XPS analyses indicated that Pb 2+ was adsorbed via the ion exchange of carboxylic groups and chelation with acylamino and amino groups. These results suggested that the EP 48 might be a promising adsorbent for the removal of low concentrations of Pb 2+ in contaminated water.
研究领域:
环境科学
·
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Siyi Zhang,Kamile Arkin,Yuxin Zheng,Jicheng Ma,Yuyang Bei,Di Liu,Qingkun Shang
In this paper, an environmentally friendly, visible and easy-to-recycle spherical adsorbent (SA@PEI-CDs, SA : sodium alginate, PEI: polyethyleneimine, CDs : carbon dots) has been prepared from functionalized positively charged biomass carbons dots (PEI-CDs) and anionic polyelectrolyte sodium alginate (SA) through electrostatic self-assembly. SA@PEI-CDs can efficiently and preferentially adsorb Pb 2+ . Compared to bare SA, the adsorption capacity of SA@PEI-CDs increased from 206.93 mg/g to 380.39 mg/g (at pH=4), which enhanced 83.82%. It can still maintain 85.67% of the original adsorption capacity after five cycles. The quenching of the blue fluorescence of the adsorbent derived from carbon dots indicates that the adsorption process has reached saturation. The investigation about the adsorption isotherm models, kinetics and thermodynamic parameters reveals that the adsorption process follows Freundlich isotherm model based on chemical adsorption , which is an endothermic spontaneous reaction with an increase in entropy. The possible adsorption mechanism is electrostatic attraction, ion exchange, and together with the coordination of -NH 2 , -OH, -COOH with Pb 2+ . In addition, the extremely easy-to-recycle spherical adsorbent is also used in the multi-layer adsorption and separation of simulated sewage samples in the water purifier model. For simulated water samples whose concentration of five/three types of heavy metal ions exceeds 100 times the standard, after using adsorbent SA@PEI-CDs for two or three consecutive adsorptions, the content of heavy metals decreases rapidly, which is far below the limit value of high-quality water. The Pb 2+ ion concentration decreased from 1.0 mg/L to 0.002540 mg/L and 0.003611 mg/L, respectively.
研究领域:
材料科学
·
环境科学
·
化学工程
·
水处理
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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）