ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 23
·30312-30322
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IF 4.223
Wang Yingya,Zhang Hanbing,Yaseen Muhammad,Tong Zhangfa,Chen Ninghua,Shi Huazhen
In order to endow alkaline Ca-bentonite (ACB) with magnetic separation ability, simultaneously obtain better magnetic stability and stronger removal capacity of heavy metal cations; magnetic alkaline Ca-bentonite/carboxymethylcellulose-chitosan film (MACB/C-C) was prepared by organic modification of magnetic alkaline Ca-bentonite (MACB) using non-toxic carboxymethylcellulose and chitosan. Textural characterization results revealed that magnetic Fe 3 O 4 nanoparticles were successfully immobilized on ACB and modified with C-C. The functionalized layer of C-C concurrently enhanced the stability of Fe 3 O 4 and removal performances of heavy metal cations. Adsorption results indicated that MACB/C-C exhibited thorough separation from aqueous solution and greater uptake ability for Pb(II) and Cd(II) (483 mg·g −1 and 123 mg·g −1 ) than the nascent MACB (335 mg·g −1 and 76 mg·g −1 ), respectively, at pH 5 and 25 °C temperature. The adsorption of Pb(II) and Cd(II) on MACB/C-C mainly occurred via surface precipitation and complexation when pH > 2. MACB/C-C could be efficiently recycled with marginal decrease in adsorption capacity. The current approach credited to the convenient operation, simplified synthesis, and high efficiency of MACB/C-C could be deemed as a promising alternative for the removal of heavy metal cations from wastewater.
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 39
·6899-6908
·
IF 3.545
Huimin Wang,Tingting Wang,Zibin Huang,Yizhuo Liu,Dehui Leng,Junli Wang
The growth of metal chalcogenide nanowires (NWs) on metal substrates is challenging work since the direct reactions taking place between the chalcogen (S, Se or Te) and zero-valent metal (M0) are frequently unable to regulate the crystallization of nanocrystals in an anisotropic one-dimensional (1D) manner. We here report the use of Ag2Se seeds as catalyst particles to realize the growth of metal selenide (MSe) NWs on their respective metal foil or flakes, including ZnSe/Zn, CdSe/Cd, and MnSe/Mn material systems. Metal foil or flakes (M = Zn, Cd and Mn) serve as a support substrate as well as a metal cation source during the NW synthesis. The preformed Ag2Se seeds play the roles of not only catalytic particles that initiate a so-called solution–solid–solid process to produce crystalline MSe NWs on metal substrates, but also inert impurities that promote an electrochemical anodic reaction of the metal to supply metal cations (M0 − 2e → M2+) for the NW formation. The microstructural studies by HRTEM reveal the polytypism and particularly the diameter-dependence of crystal phases and growth directions in the resulting MSe NWs, which can be rationalized from the viewpoints of the energetics and the catalyst/NW interfacial structures. These semiconductor NWs grown on metal foil or flakes may find wide use in photoelectric catalysis and devices without a transfer process of free-standing NWs onto a conductive support substrate.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Xin Zhao,Meng Li,Fuqiang Zhai,Yanling Hou,Rui Hu
Phosphate species can complex with nuclides and heavy metals from aqueous solutions strongly. The introduction of phosphate groups onto the surface of biochar sorbents (mostly <1.0 at.% of P) is highly desired. In this study, phosphate modified hydrochars (HTBs) were prepared through the hydrothermal carbonization of bamboo sawdust with various duration (2, 12, 24 h) in the presence of phytic acid (0–70 wt%). The results showed that the addition of PA with a low concentration of 10 wt% carbonized at 2 h generated hydrogen protons to etch the pristine sawdust, inducing the granulation of surfaces and a 5.5-fold enhancement of surface area. While HTBs carbonized with increasing PA concentrations (30–70 wt%) and longer duration (12 and 24 h) presented more carbonaceous particles with rising sizes from <100 nm to 2.5 μm, which should be due to the cross-linkage of dehydrated phosphate-containing organic carbon components to the matrix, enabling the resultful surface modification (maximum of 2.1 wt% of P). The uptake of U(VI), Pb(II) and Cd(II) on HTBs was investigated given various geochemical conditions including contact time, pH, ionic strength , humic acid and temperature. HTBs could capture U(VI), Pb(II) and Cd(II) efficiently from the ideal and simulated wastewaters, and be reused well after six recycles. This work opened a new strategy for the potential of phosphate-hydrochars in the aqueous remediation.
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高影响因子
NANO
·
2020
·
IF 1.566
Junda Wu,Jia Gao,Zhiqing Hou,Wendong Xing,Jiangdong Dai,Yongsheng Yan,Yilin Wu
Enoxacin, as the broad-spectrum antibacterial activity antibiotics, has been widely used in treatment of bacterial diseases in animals and humans around the world. The extensive use of enoxacin in healthcare has also caused increasingly serious environmental risk as a matter of course. In this work, enoxacin imprinted poly (vinylidene fluoride) (PVDF) composite membranes (EIPCMs) were developed by strategy of surface grafting beta-cyclodextrin ( β -CD) for the improved hydrophilic and antifouling properties of the basal membrane. PVDF membrane was prepared by phase inversion method, and β -CD was grafted onto the surface after hydroxyl groups modification. The effects of adding amount of β -CD on performance of basal membranes were systematically examined. Further, the specific recognition sites were fabricated via sol–gel surface imprinting method using 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS) as functional monomer and cross-linker, respectively. The specific adsorption and permeation experiments were investigated and explored the separation performance and mechanism of EIPCM. The results indicated that the as-prepared EIPCMs not only exhibited highly favorable features and high rebinding strength (31.25 mg g − 1 ) , but also possessed superior selective performance toward enoxacin (imprinted factor β is 3.15). Furthermore, in order to investigate the practical applications of EIPCMs, the adsorption experiments were carried out using environmental sewage. The work developed here shows great potential for further applications in selective recognition and separation antibiotics pollution from the environment.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xiaojun Zhou,Lingshuai Kong,Zongyu Jing,Shuqing Wang,Yongchao Lai,Meng Xie,Long Ma,Zhenyu Feng,Jinhua Zhan
In this study, superparamagnetic β-CD-MnFe 2 O 4 with a large surface area was synthesized via a facile co-precipitation method, with β-cyclodextrin (β-CD) acting as a coating agent. The as-prepared β-CD-MnFe 2 O 4 exhibited better catalytic performance than bare MnFe 2 O 4 in terms of activating peroxymonosulfate (PMS) to degrade 2,4-dichlorophenol (2,4-DCP) over a broad pH range of 5–11. Electron spin resonance spectroscopy (ESR) and free radical quenching experiments indicate that various active species (SO 4 − / OH/O 2 − / 1 O 2 ) are generated in the β-CD-MnFe 2 O 4 /PMS system and that pollutants trapped in the cyclodextrin cavity are quickly degraded. Various reaction parameters of the β-CD-MnFe 2 O 4 /PMS system and the stability of β-CD-MnFe 2 O 4 were also investigated. The results indicate that β-CD-MnFe 2 O 4 is promising for use in water purification owing to its excellent magnetic separation and recovery properties and good resistance to humic acid (HA).
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2019
·
IF 4.865
Yasir Hamid,Lin Tang,Bilal Hussain,Muhammad Usman,Muhammad Laeeq ur Rehman Hashmi,Muhammad Bilal Khan,Xiaoe Yang,Zhenli He
The present study evaluated the efficiency of pre-selected composite amendments (CA-1: biochar-lime-sepiolite-zeolite and CA-2: manure-lime-sepiolite) for immobilization and sorption of Cd and Pb in field and batch sorption experiments. The field experiment was performed in a co-contaminated clay purple soil (stagnic anthrosols). Along with a control experiment (T1), CA-1 and CA-2 were tested at different rates including 750, 1500, 3000 and 6000 kg ha −1 by growing wheat as the test crop. The obtained results revealed that the highest dose of both composites (T5: 6000 kg ha −1 and T9: 6000 kg ha −1 ) increased the soil pH to 6.85 and 6.81, respectively as compared to the control (5.63). DTPA-extractable Cd and Pb contents decreased with composite treatments (T7 and T4) at harvest stage samples. Metal fractionation depicted that application of amendments decreased the exchangeable fraction at harvesting stage. Application of CA-2 and CA-1 (3000 kg ha −1 ) significantly increased the plant biomass (by 28% and 24%, respectively) and grain yield (by 26% and 22%, respectively) of wheat. Furthermore, batch sorption experiment results revealed that Langmuir adsorption model better fitted the sorption results with R 2 values ranging between 0.99 and 0.91 for Cd and Pb, respectively. CA-1 and CA-2 exhibited the maximum adsorption capacity for Cd with no significant difference among treatments but Pb adsorption capacity was highest in CA-1 followed by CA-2 and control. The results of our experiments revealed that the application of organics combined with inorganic materials enhanced Cd and Pb immobilization and sorption, consequently reducing metals availability in laboratory and field conditions. Moreover, for field trials, application of the composite amendments at 3000 kg ha −1 emerged as the suitable treatment for tested wheat-grown area.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Yaxiao Zhang,Chao Li,Yingchun Su,Wei Mu,Xiaojun Han
Heavy metal pollution causes serious health threat to humanbeings. Herein we fabricated a novel bismuth oxycarbide (BOC) modified glassy carbon electrode (GCE) for the simultaneous detection of cadmium and lead ions using differential pulse anodic stripping voltammetry (DPASV). The main factors influencing the detection performance, such as solution pH, deposition voltage and deposition time were optimized to be 4.5, −1.3v, and 700s, respectively. The detection limits for lead ions and cadmium ions were 4.30 μg/L and 3.97 μg/L, respectively. These detection limits are both lower than 5 μg/L for cadmium ions and 10 μg/L for lead ions national standards. The BOC modified GCE exhibits good selectivity and reliability for the detection of lead ions and cadmium ions. BOC/GCE may find great potential for heavy metal ions detection in real water sample.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·1874-1885
·
IF 1.637
Wang Hongpeng,Lin Yuecheng,Li Yin,Dolgormaa Anudari,Fang Hui,Guo Lin,Huang Jun,Yang Junxing
To improve the adsorption capacity of Cd(II) ions, Cd(II) ions were imprinted on the surface of aminoethyl chitosan (AECS), which was coated on Fe 3 O 4 @SiO 2 nanoparticles. A novel magnetic Cd(II) ion-imprinted polymer (Cd(II)-IIP) was synthesized, characterized, and applied to the selective separation of Cd(II) ions from aqueous solution. The adsorption–desorption properties and selectivity of Cd(II)-IIP and a non-imprinted polymer (Cd(II)-NIP) were investigated. The optimum pH and equilibrium binding time were established at pH 6.0 and 60 min, respectively. Kinetics studies demonstrated that the adsorption process proceeded according to a pseudo-first or second order model, while the adsorption isotherms agreed with the Langmuir model. The maximum adsorption capacities of Cd(II)-IIP and Cd(II)-NIP toward Cd(II) ions, as calculated by the Langmuir equation, at pH 6.0 and 25 °C were 26.1 and 6.7 mg/g, respectively. The imprinted polymer showed higher selectivity toward Cd(II) ions compared to the non-imprinted polymer. The relative selectivity factor ( β r ) values of Cd(II)/Cu(II), Cd(II)/Cr(II), and Cd(II)/Pb(II) were 3.315, 3.875, and 2.061, respectively. In addition, Cd(II) ions adsorbed on the Cd(II)-IIP adsorbent could be easily released using 0.1 M HNO 3 , thus showing good material stability and reusability. The adsorption capacity of Cd(II)-IIP was retained at 74% after undergoing six adsorption–desorption cycles.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 5
·5108-5121
·
IF 2.914
Fu Binbin,Xie Fencun
A novel cellulose microcrystalline-manganese dioxide nanocomposite (CMC-NMO) was synthesized by the redox reaction between potassium permanganate and ethanol based on cellulose microcrystalline. The cellulose microcrystalline (CMC) as support providing growth sites for the manganese dioxide nanowhiskers produced by the redox reaction and its application for Pb(II) and Cd(II) removal from aqueous was investigated. The characterization of as-synthesized material was revealed by various spectroscopic and microscopic techniques. Infrared-transform infrared (FITR) indicates that the incorporation of manganese oxide to CMC does not change the initial structure of it. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) data show that the manganese dioxide nanowhiskers with a few nanometers are uniformly dispersed on the surface of cellulose. Kinetics experiments reveal that Pb(II) and Cd(II) adsorption on CMC-NMO is a fast process and pseudo-second-order model fits the adsorption better. The maximum adsorption capacities of Pb(II) and Cd(II) obtained from the Langmuir model are 290.8 mg/g and 67.4 mg/g, respectively. The mechanism is mainly attributed to surface complexation and electrostatic attraction by energy dispersive analysis of X-rays (EDAX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. In addition, depth removal experiments show that the residual concentrations of Pb(II) and Cd(II) in natural water after adsorption are lower than 0.01 mg/L. The regeneration and cyclic utilizing studies indicate that CMC-NMO has good adsorption stability. Therefore, the results indicate that this material can be employed as a potential adsorbent for current serious Pb(II) and Cd(II) pollution caused by industrial emissions.
Graphical abstract
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Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 3
·1124-1137
·
IF 9.931
Liangxin Zhu,Chong Chen,Fumin Li,Zhitao Shen,Yujuan Weng,Qingsong Huang,Mingtai Wang
To improve the charge separation and transport efficiency in perovskite solar cells (PSCs) with a TiO2-based hybrid mesoscopic/planar architecture, CdS and Cd(SCN2H4)2Cl2 are incorporated into the CH3NH3PbI3 active layer through in situ synthesis to prepare CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction films for PSCs. The incorporated CdS and Cd(SCN2H4)2Cl2 improve the quality of perovskite films. Moreover, Cd(SCN2H4)2Cl2 can effectively reduce the defect state density on the CH3NH3PbI3 crystal surface, which decreases charge recombination and facilitates charge transport in PSCs. Furthermore, first-principles calculations show that the I atom of CH3NH3PbI3 has a strong interaction with the Cd atom of CdS, which induces interfacial charge redistribution and charge transfer at the CH3NH3PbI3/CdS interface and therefore decreases the energy of the CH3NH3PbI3:CdS composite system, leading to more efficient electron–hole separation and improved structural stability of the perovskite bulk-heterojunction film. For the above reasons, the CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction cell shows much higher efficiency and better stability than the PSCs with pure CH3NH3PbI3. The highest efficiency reaches 20.1%, which is 1.16 times that (17.3%) of the PSCs with pure CH3NH3PbI3 and is also much higher than those of previously reported CH3NH3PbI3 PSCs with a compact/mesoporous TiO2 film. Our research results may provide a new understanding for improving the structural stability and performance of PSCs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Chao Shan,Zhiyao Ma,Meiping Tong
Poly(1-vinylimidazole)-grafted Fe 3 O 4 @SiO 2 magnetic nanoparticles (FSPV) were developed to remove both free Cd(II) and nitrilotriacetic acid (NTA) complexed Cd(II) from water. The adsorption capacity of NTA-complexed Cd(II) (42.1 mg/g) was larger than that of free Cd(II) (24.8 mg/g). Free Cd(II) and NTA-complexed Cd(II) could be reduced from 50 μg/L to below 5 μg/L within 10 and 20 min, respectively. FSPV could effectively remove trace free and NTA-complexed Cd(II) over broad pH ranges of 5–10 and 5–11, respectively. Moreover, the presence of seven coexisting ions (up to 100 mM) including four cations (Na + , K + , Ca 2+ , and Mg 2+ ) and three anions (Cl − , NO 3 − , and SO 4 2− ) all slightly promoted the removal of both free and NTA-complexed Cd(II) onto FSPV. The removal of free Cd(II) or NTA-complexed Cd(II) was not obviously affected by the presence of Ni(II) and Co(II) (50 μg/L), humic acid (up to 3 mg/L as TOC) or alginate (up to 8 mg/L as TOC). In addition, FSPV could be regenerated with 10 mM HCl in 10 min, and the removal of both types of Cd(II) maintained above 95% in five consecutive adsorption/regeneration cycles. Therefore, FSPV could be utilized as promising adsorbent for both free and NTA-complexed Cd(II).
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 23
·期 2
·1460-1470
·
IF 2.828
Chen Wei-fang,Zhang Jinghui,Zhang Xiaomao,Wang Weiya,Li Yuxiang
Nano-zero-valent iron/activated carbon (nZVI/AC) composite was evaluated for its effectiveness in the stabilization of Cu, Pb, Cd, and Cr in dredged river sediment. Synthetic precipitation leaching procedure (SPLP) and toxicity characteristic leaching procedure (TCLP) were adopted to compare the effects of nZVI/AC dosage, particle size, time duration, and temperature on heavy metal leachability. The results show that leachability dropped considerably with the addition of nZVI/AC and powdered particles in the size of 0.075–0.18 mm was more effective in stabilization than granular ones. Stabilization effect was stable in long-term and robust against changes in temperature. Tessier sequential extraction revealed that heavy metals were associated with solid particle, inorganic or organic matters in sediment. The addition of nZVI/AC was able to convert relatively weakly bound heavy metals into more strongly bound species and thus reduce the bioavailability and toxicity. Also, the standard potential of heavy metals may decide the mechanism of stabilization process.
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高影响因子
危险品化学品经营许可证（带存储）