JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Guangyu Duan,Zhanfang Cao,Hong Zhong,Xin Ma,Shuai Wang
Heavy metal wastewater pollution has become an ecological challenge worldwide. This study reports the development of a novel poly (6-acryloylamino-N-hydroxyhexanamide) (PAHHA) resin for effective adsorption of heavy metal ions , including Cu 2+ , Pb 2+ and Ni 2+ . The chelating resin was synthesized by the grafting reaction between 6-amino-N-hydroxyhexanamide and polyacrylic resin , thus containing the hydroxamate and acylamino groups. The batch adsorption experiments revealed that the PAHHA resin exhibited an excellent adsorption performance for Cu 2+ , Pb 2+ and Ni 2+ . The maximum adsorption capacities of Cu 2+ , Pb 2+ and Ni 2+ were determined to be 238.59, 232.48 and 115.77 mg·g −1 , respectively. Based on the adsorption kinetics , the pseudo-second-order kinetic model was noted to fit well for all metal ions. The metal ion concentration as a function of the equilibrium adsorption capacity fitted well with the Langmuir isotherm , thus indicating the single layer adsorption process . The adsorption mechanism was investigated by using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), density functional theory (DFT) calculations, X-ray photoelectron spectroscopy (XPS) and adsorption isotherms . It was revealed that the PAHHA resin possessed multiple active sites, including –CONHOH, –CONH– and –COOH, which could strongly adsorb the metal ions. Specifically, the –CONHOH group displayed a high affinity by forming a stable five-membered ring with heavy metal ions. Overall, the developed resin exhibits advantages such as simple synthesis, inexpensive raw material and good recyclability , along with high adsorption ability, thus providing a new approach for efficiently treating wastewater contaminated with heavy metal ions.
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 MANAGEMENT
·
2021
·
IF 6.789
Waqas Ahmed,Sajid Mehmood,Avelino Núñez-Delgado,Sehrish Ali,Muhammad Qaswar,Awais Shakoor,Ali Akbar Maitlo,Di-Yun Chen
A novel phosphorus (P) modified biochar (PLBC) was produced by pyrolyzing biomass of the dietic herb Taraxacum mongolicum Hand-Mazz (TMHM) and treating it with monopotassium phosphate (KH 2 PO 4 ). This phosphorous loaded biochar was then assessed as adsorbent for As(III) removal from contaminated water . In the current research, the adsorbent was characterized before and after P loading by means of SEM-EDX, TEM , FTIR and XRD techniques . It was evidenced that the presence of P on the surface of the biochar (BC) could improve its efficiency to remove As(III) from contaminated environments. Adsorption kinetics were evaluated by performing batch-type experiments at varied times and pH values (5, 7 and 9). The kinetic study revealed that a contact time of 24 h was required to attain equilibrium and the experimental data were best fitted to the pseudo-second-order kinetic model (q e = 17.1 mg g −1 ). In addition, several batch experiments were conducted with varied arsenic concentrations. During the adsorption tests, the maximum adsorption of As(III) was found at pH 5. The adsorption study further showed that compared to BC, PLBC depicted increased removal of As(III) from contaminated solutions. The adsorption experimental data showed the best fit to the Langmuir isotherm model (with R 2 = 0.84), with maximum As(III) adsorption capacity reaching 30.76 mg g −1 for PLBC.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Xiaoping Men,Qiaoxia Guo,Bo Meng,Shenyong Ren,Baojian Shen
Bisphenol A (BPA) is a pollutant in the sewage of petroleum and petrochemical field, which is difficult to be treated efficiently. In this work, the composite modified Bentonite (CPAB/EGIS/B) was prepared by using ester-containing gemini imidazolium surfactant (EGIS) and cationic polyacrylamide (CPAB) as modifiers, CPAB/B and EGIS/B were also prepared. The samples were characterized by XRD , EA , FT-IR, SEM, and N 2 Physical adsorption and desorption, the changes of composition and structure of modified bentonite were studied. The adsorption performance of samples was tested by BPA, which shows that CPAB/EGIS/B has the strongest adsorption capacity for BPA solution. Under the conditions of initial pH, at 30 °C, the best adsorption effect was obtained when the dosage of the composite was 2.5 g/L for 180 min, the theoretical maximum adsorption capacity was 119.88 mg/g. CPAB and EGIS formed a more affinity organic micro-environment between bentonite layers and establish a nice structure-activity relationship with BPA. The adsorption of BPA onto CPAB/EGIS/B matched well with the pseudo-second-order model. The obtained isotherms data were described well by the Langmuir model and the adsorption is a spontaneous exothermic process.
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
CHEMOSPHERE
·
2019
·
IF 5.108
Jiayi Zheng,Xianda He,Chiliu Cai,Jiangxiong Xiao,Yao Liu,Zhe Chen,Baoying Pan,Xiaoqing Lin
A polar modified post-cross-linked poly (divinylbenzene- co -ethyleneglycol-dimethacrylate) (PCL-PDE) resin was synthesized by suspension polymerization of ethylene glycol dimethacrylate (EGDMA) and divinylbenzene (DVB), and a post-cross-linked reaction. After characterization, the adsorption behaviors of 5-hydroxymethylfurfural (5-HMF) on PCL-PDE resin were determined in comparison with the starting copolymers PDE resin. The equilibrium adsorption capacity of 5-HMF on PCL-PDE resin was much larger than PDE resin and the increase rate was greater than 52.6%. The equilibrium data of 5-HMF onto PCL-PDE resin were found to be better fitted by the Langmuir isotherm model. The kinetic data shows that the adsorption reached equilibrium in a short time (less than 20 min) can be fitted by the pore diffusion model (PDM) at various operating conditions. The effective pore diffusion coefficient was dependent upon adsorption temperature, and were 6.706 × 10 −10 , 8.958 × 10 −10 , 1.136 × 10 −9 and 1.429 × 10 −9 m 2 s −1 at 288, 298, 308 and 318 K, respectively. Furthermore, the effects of feed flow rate ( Q f = 0.6, 1.5, 3.0 and 6.0 mL min −1 ) and initial 5-HMF concentration ( c f = 0.52, 1.02, 2.00 and 4.96 g L −1 ) on the adsorption were investigated systematically. Besides, a general rate model (GRM) was used to predict adsorption breakthrough curves of 5-HMF. The simulation results are highly consistent with the experimental data, indicating that the GRM can successfully simulate this process. In the desorption process, the desorption capacity reaches 99.6% of adsorbed capacity, suggesting that the PCL-PDE resin exhibited good reusability. Therefore, it could be suggested that the PCL-PDE resin has a potential application in the separation and purification of 5-HMF.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
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IF 3.442
Zhenle Tian,Liping Zhang,Xinxin Sang,Gang Shi,Caihua Ni
Sodium alginate is a natural biomacromolecule with promising applications as a flocculant for wastewater treatment due to its biodegradability and non-toxicity. To enhance the flocculating efficiency, simplify the synthetic process of the flocculants and expand the application scope of alginate, a novel amphoteric flocculant was synthesized through reaction of alginate with 3-chloro-2-hydroxypropyltrimethyl ammonium chloride under alkaline conditions. The structures of the flocculants were characterized using various methods. The flocculants demonstrated nanoparticle sizes with a narrow distribution. The amphoteric flocculant could not only effectively remove the positively-charged Pb 2+ from wastewater, but also removed the negatively-charged humic acid. Under optimum conditions, the removal rates reached 92.32% and 95.18% for Pb 2+ and humic acid, respectively. Compared with unmodified alginate, the amphoteric flocculant had significantly improved flocculation for the heavy metal ions and negatively-charged pollutants. The flocculating mechanism for heavy metals was chelating, and was confirmed by X-ray photoelectron spectroscopy, and the flocculating mechanism for humic acid was electric neutralization. The adsorption isotherm could be described by a Langmuir model. The flocculation process accorded with quasi-second-order kinetics equation. This novel amphoteric flocculant has promising applications as an environmentally-friendly treatment agent for 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
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2015
·Vol. 32
·期 6
·1129-1136
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IF 1.166
Xiao Xuemin,Tian Fei,Yan Yujun,Wu Zhilin,Wu Zhansheng,Cravotto Giancarlo
Coal-based activated carbon (CAC) was prepared from coal produced in Xinjiang of China by microwave activation. CAC was characterized and used as an adsorbent for phenanthrene adsorption. The effects of temperature, adsorption time, CAC amount, initial concentration and pH value of solution on phenanthrene adsorption were studied. The adsorption rate of phenanthrene onto CAC was obtained nearly 100% with initial concentration of 100 mg/L and CAC dosage of 0.3 g at 25 °C. Phenanthrene adsorption was well described with the Langmuir isotherm. The pseudo-second-order model was found to more effectively explain the adsorption kinetics of phenanthrene. The lower temperature was favorable to the adsorption rate and equilibrium adsorption capacity of phenanthrene onto CAC. The thermodynamic parameters ΔH θ , ΔS θ and ΔG θ computed for phenanthrene adsorption onto CAC demonstrate the process was spontaneous, radiative, and entropically driven. Thus, CAC prepared by microwave activation could be effective for removing phenanthrene.
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
·
2015
·
IF 4.074
Jun Huang,Haihua Xie,Hui Ye,Tian Xie,Yuecheng Lin,Jinyan Gong,Chengjun Jiang,Yuanfeng Wu,Shiwang Liu,Yanli Cui,Jianwei Mao,Lehe Mei
Chitosan was prepared by N -deacetylation of squid pens β-chitin, and N -carboxyethylated chitosan ( N -CECS) with different degrees of substitution (DS) were synthesized. DS values of N -CECS derivatives calculated by 1 H nuclear magnetic resonance (NMR) spectroscopy were 0.60, 1.02 and 1.46, respectively. The adsorption capacity of Cu(II) by N -CECS correlated well with the DS and pH ranging from 3.2 to 5.8. The maximum Cu(II) adsorption capacity ( q m ) of all three N -CECS at pH 5.4 was 207.5 mg g −1 , which was 1.4-fold higher than that of chitosan. The adsorption equilibrium process was better described by the Langmuir than Freundlich isotherm model. Adsorption of Cu(II) ion onto N -CECS followed a pseudo-second order mechanism with chemisorption as the rate-limiting step. In a ternary adsorption system, the adsorption capacity of Cu(II) by N -CECS also presented high values, and q m for Cu(II), Cd(II), and Pb(II) were 150.2, 28.8, and 187.9 mg g −1 , respectively.
研究领域:
生物化学
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环境科学
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Kexin Zhang,Haiyan Li,Xingjian Xu,Hongwen Yu
In this work, we report a room-temperature approach to synthesizing nitrogen-functionalized graphene oxide (GO). The chemical structure of GO- triethylenetetramine-methacrylate (GO-TETA-MA) was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and 13C nuclear magnetic resonance, respectively. The GO-TETA-MA demonstrated extremely efficient removal of copper from wastewater. The adsorption capacity was found to be 34.4 mg/g for Cu(II) (at pH = 5 and 25 °C). The final concentration of Cu(II) was lower than the quality standard for groundwater and even lower than the allowable level of copper contaminant in drinking water in China. The effects of several parameters on adsorption, including pH value, contact time, adsorption temperature, initial concentration, acid stability, and thermal stability, were investigated. Kinetic data were well-described by a pseudo-first-order model. Both Freundlich and Langmuir isotherm models were applied to the experimental data analysis, and the former proved to be a better fit. The underlying mechanism of synergistic adsorption of heavy metal ions was considered. Then, the removal efficiency for four copper fungicides was studied and was found to reach 100%. These results suggest that GO-TETA-MA has the potential to be applied in environmental management.
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhen Yang,Ying Li,Peihua Ma
H 2 TiO 3 is the most promising and highly selective lithium-ion sieve. In this study, HTO-PVC- x ( x = 10, 15, 20, 25, and 30) lithium-ion sieves were prepared via an antisolvent method using PVC as the matrix. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that Li 2 TiO 3 was preferentially indexed to a C 2/ c monoclinic structure. LTO-PVC- x had a spherical size of 300 μm and an enormous specific surface area. The morphology and size of HTO-PVC- x obtained by HCl elution were consistent with those of LTO-PVC- x , indicating good separation and recycling properties. HTO-PVC-15 had a higher adsorption performance and adsorption capacity at a lower initial Li + concentration. The adsorption behaviour of HTO-PVC-15 is in accordance with the Langmuir isothermal model and pseudo-second-order model, which belongs to the chemical adsorption process . It reached 96% of its equilibrium adsorption capacity within 2 h. Simultaneously, it maintained high adsorption selectivity and cycling performance and a low Ti 4+ dissolution rate. Thus, HTO-PVC-15 has immense potential to be used for salt lake brine adsorption applications.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Ran Wang,Min Li,Jingxin Zhou,Lexin Zhang,Jianmin Gu,Mingli Wang,Tifeng Jiao
In this work, Langmuir–Blodgett (LB) composite thin films were successfully prepared using black phosphorus nanosheets (BPNS) and dye molecules. Black phosphorus (BP) was first exfoliated in isopropanol solution to form BPNS, and then, BPNS were modified with 4-azidobenzoic acid (Az-BPNS) to improve their stability. The characterization results showed that the synthesized Az-BPNS-dye LB films have a uniform and ordered structure. In addition, the synthesized Az-BPNS-dye LB films exhibit excellent photoelectrochemical performance, and Az-BPNS-methylene blue (MB) produces higher photocurrent compared to Az-BPNS-Neutral red (NR) films. The current work shows an effective way to prepare functionalized BP-based materials and provide evidence for their application in optoelectronic devices.
研究领域:
材料科学
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光学
·
电化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhenglu Shi,Xing Zhao,Xiaobo Chen,Wenfeng Fu,Lin Lan,Jun Zhang,Francis Chi-Chun Ling,Li Wei,Qiang Ru
Zinc dendrites have a serious impact on the long-cycle performance of zinc storage equipment. Seeking efficient dendrite-inhibiting techniques for zinc anode is a pressing matter and research hotspot. Here, a metal protection strategy is reported, where the Ti 3 C 2 T x MXene film is uniformly coated on zinc anode (MXene@Zn) in parallel alignment under self-traction by an in-situ Langmuir Blodgett Scooping method (LBS). The close contact of the conductive MXene film with the zinc surface facilitates the regulation of zinc stripping/plating to achieve uniform zinc deposition. Meanwhile, the Ti 3 C 2 T x MXene with robust mechanical strength and superior flexibility can suppress the crisscross growth of zinc dendrites. The MXene@Zn electrode shows satisfying dendrite-free morphology and ultralong cycle stability with 1000 h (3 mA cm −2 /0.5 mAh cm −2 ) and 500 h (3 mA cm −2 /0.5 mAh cm −2 ). In addition, according to its additive-free and spontaneous formation of Ti 3 C 2 T x MXene protective structure, the zinc ion batteries have a high-capacity retention of 98.3 %, and the zinc ion capacitors can persist for long periods of 20,000 times stably. This result provides a valid strategy for suppressing zinc dendrites to upgrade the cycling capability of zinc storage.
研究领域:
材料科学
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电化学
·
储能技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Lu Wang,Yinfeng Li,Gaiping Li,Baoxian Ye
A new type of voltammetric sensor, Langmuir-Blodgett (LB) film of multi-walled carbon nanotubes (MWCNTs) perpendicularly modified glassy carbon electrode (GCE), was prepared and applied in determination of methylparaben . Based on the excellent electrochemical property of vertical MWCNTs on the GCE (MWCNTs-LB/GCE), a sensitive voltammetric method for determination of methylparaben was erected with liner range from 1 × 10 −6 mol L −1 to 8 × 10 −5 mol L −1 and detection limit of 4 × 10 −7 mol L −1 . The electrochemical characters of MWCNTs-LB/GCE were investigated in detail and the reaction mechanism of methylparaben was discussed. Meanwhile, cosmetic samples were analyzed using proposed method and the results obtained were well satisfactory.
研究领域:
分析化学
·
电化学传感器
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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）