Sustainability
·
2022
·Vol. 14
·期 15
·9349
·
IF 3.889
Yijia Chen,Linzhou Li,Qin Wen,Run Yang,Yiming Zhao,Xin Rao,Jihui Li,Shuying Xu,Hui Song
Magnetic modification holds a significant place for regulating the performance of biochar for wastewater treatment, endowing its magnetic separation property and facilitating its wide application. Herein, a ball-milled oxidative magnetic modification of pristine biochar was employed to manufacture magnetic biochar using K2FeO4as a precursor and internal oxidant for removal of methylene blue and tetracycline from aqueous solution. The characterizations showed that magnetic iron oxide and oxygen-containing groups were simultaneously introduced. Moreover, specific surface area and pore volume were remarkably enhanced from 0.7 m2/g to 71.2 m2/g and from 0.001 cm3/g to 0.034 cm3/g, respectively. The magnetic biochar showed that 133.76 mg/g and 58.34 mg/g adsorption capacities for MB and TC, respectively, significantly transcended the pristine biochar. Its adsorption was mainly dominated by oxygen-containing groups and iron species. This would provide an efficient oxidative magnetic modification for the preparation of oxygen-containing group-rich magnetic biochar for the removal of MB and TC.Keywords:ball-milling;oxidative magnetic modification;magnetic biochar;methylene blue;tetracycline
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Taotao Qiang,Shaoting Wang,Zhihong Wang,Longfang Ren
To solve the problem that it is difficult to recycle the ZIF-67 in aqueous solution, a porous self- supporting material (KGM/GO) was prepared by using biomass KGM. And then ZIF-67 crystal was loaded onto KGM/GO solid substrate by in-situ growth method so that a novel KGM/GO/ZIF-67 composite aerogel was obtained. FT-IR and SEM characterization showed that ZIF-67 was successfully loaded on KGM/GO substrate by covalent bonding, and the adsorption site of composite aerogel surface was uniform. The N 2 adsorption/desorption testing results showed that the porosity of composite aerogel changed from 86.48 % to 91.18 % after loading ZIF-67. It provides enough diffusion channel and active adsorption sites. Moreover, the as-prepared composite aerogel showed excellent adsorption ability to both methylene blue and methyl orange, and the maximum adsorption capacities were as high as 185.67 mg/g (pH = 8) and 130.2 mg/g (pH = 2), respectively. Noted that after five cycles, the adsorption capacity to methylene blue and methyl orange were still up to 174.4 mg/g and 118.3 mg/g, which exhibited high adsorption capacity and excellent reusability. Therefore, loading ZIF-67 on KGM/GO substrate can enhance the adsorption and recovery performance of ZIF-67. The method provides a new possibility for the treatment of complex dye-containing wastewater.
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Gels
·
2022
·Vol. 8
·期 9
·546
·
IF 4.432
Xiaolei Ma,Duomo Duan,Jinbin Chen,Baolong Xie
Hydrogels with polysaccharides as high polymer substrates have surprising advantages in wastewater treatment with complex components. Therefore, in this study, polysaccharides named EPS were extracted fromEnteromorpha prolifera, a coastal pollutant with a wide range of sources, and cationic modification was performed to obtain CAEPS, the hydrogel with a double network structure was prepared based on EPS and CAEPS. Meanwhile, the structural characteristic of EPS and CAEPS-based hydrogel were identified by HPLC, AFM, FT-IR, TGA, SEM-EDS, Pore size distribution, and WCA, which showed that the porosity, apparent (skeletal) density, and hydrophilicity of CAEPS-hydrogels. We used nonlinear isotherms to uncover the adsorption mechanism of hydrogel applied to the water environment containing three typical pollutants (Methylene blue, Cefuroxime, and Cr (VI)). The results showed that the adsorption isotherm of the two hydrogels fit the Langmuir isotherm model, which indicated the monolayer adsorption of the pollution factor onto EPS- and CAEPS-hydrogels. The maximum adsorption capacities of CAEPS-hydrogels were higher than EPS-hydrogels, which indicated the microstructure and adsorption performance of the CAEPS-hydrogel are strengthened.Keywords:cationic enteromorpha polysaccharide;hydrogel;structural;adsorption
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Bin Ren,Junfeng Miao,Shasha Wang,Yuelong Xu,Zuozhao Zhai,Xiaoxi Dong,Zhenfa Liu
In this study, a 3D Fe-based and N-doped coral-like carbon composite (Fe-NGLC) was successfully prepared via the simple impregnation of a self-made 3D nitrogen-enriched and porous layered graphene-like support with Fe 2 (SO 4 ) 3 as the precursor. It was characterized through X-ray diffractometry, scanning electron microscopy, X-ray photoelectron spectroscopy, etc.; Fe-NGLC exhibited regular three-dimensional coral-like structures with dense porosity and high of Fe–N species content. As a heterogeneous Fenton catalyst of the methylene blue (MB) degradation, the prepared composite showed impressive activity over a wide pH range (4–10). Almost 100% of the MB could be degraded in 60 min, and the results agreed well with the pseudo-first-order kinetic model . To identify the crucial active sites of MB degradation, the correlation between the rate constant derived from the pseudo-first-order kinetic model and the different Fe species in the catalyst prepared under various conditions was investigated. This revealed the key role of the Fe–N complexes for the heterogeneous Fenton reaction. Moreover, Fe-NGLC exhibited recyclability and only a slight decrease in removal efficiency after five cycles. The excellent performance of Fe-NGLC demonstrates its great potential as a Fenton catalyst for wastewater treatment .
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Journal of Environmental Sciences
·
2021
·
IF 5.565
Wen Zhou,Jiale Deng,Zhen Qin,Ruihua Huang,Yi Wang,Shanshan Tong
Toxic heavy metal ions, valuable noble metal ions and organic dyes are significant concerns in wastewater treatment. In this work, MoO 3 nanobelts (MoO 3 NBs) prepared by solvothermal method and MoS 2 nanoarrays (MoS 2 NAs) constructed using MoO 3 NBs precursor were proposed to effectively remove heavy/noble metal ions and organic dyes, such as Pb (II) , Au (III) and Methylene Blue (MB). The two adsorbents exhibited the excellent adsorption capacity towards Pb (II) , Au (III) and MB. The maximum removal capacity of Pb (II) and MB on MoO 3 NBs was 684.93 mg/g and 1408 mg/g, respectively, whereas that of Au (III) and MB on MoS 2 NAs was 1280.2 mg/g and 768 mg/g, respectively. Furthermore, the thermodynamic parameters were calculated from the temperature-dependent curves, suggesting that the removal of Pb (II) and Au (III) on both adsorbents was spontaneous and endothermic. The new adsorbents introduced here were high adsorption activity, ease of fabrication, high scalability, good chemical stability, great repeatability and abundant and cheap supply, which were highly attractive for wastewater treatment.
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PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 14
·2961-2972
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IF 3.089
Zhu Lijun,Zhu Xinxin,Zhang Chao,Huo Tian,Hou Xinlan,Guo Dandan,Zhang Huiming,Xia Daohong
The zirconium-based porphyrin MOFs sensitized TiO 2 (PCN224–TiO 2 ) was synthesized in situ by self-assembly of porphyrin, ZrCl 4 with nano TiO 2 . The composite catalyst was determined by detailed structural and photoelectrochemical characterization. The UV–Vis absorption and fluorescence spectrum confirm that PCN224 and TiO 2 are coupled. The PCN224–TiO 2 had significant absorption of visible light and the PCN224–TiO 2 had the largest photo-generated current, which proved the porphyrin MOFs material has good internal conductivity and has a close combination with TiO 2 . Compared with carboxyphenyl porphyrin sensitized TiO 2 (HTCPP–TiO 2 ), mixture of TCPP and TiO 2 (TCPP/TiO 2 ) and PCN224, the PCN224–TiO 2 showed better removal performance of methylene blue under visible light. Under low-power xenon lamp irradiation, the removal rate of PCN224–TiO 2 (1:3) on methylene blue reached 93.2% in 4 h. And PCN224–TiO 2 had stable cycling catalytic performance. The PCN224–TiO 2 promoted the degradation process by strengthening the adsorption of organic pollutants, thus improving the removal performance. Graphic abstract
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高影响因子
Journal of Materials Research and Technology-JMR&T
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2020
·
IF 5.289
Yuqi Wang,Jian Pan,Yanhui Li,Pengfei Zhang,Meixiu Li,Heng Zheng,Xiaoping Zhang,Hong Li,Qiuju Du
Three adsorbents, trichosanthes kirilowii maxim shell activated carbon (TKAC), nickel alginate/activated carbon (NA/AC) aerogel and nickel alginate/graphene oxide (NA/GO) aerogel were prepared in the present study. The three-dimensional network structure of the NA/AC aerogel and NA/GO aerogel was found to effectively control the dispersion state of TKAC and GO. The adsorption behavior was systematically investigated in terms of adsorption temperature and time, initial adsorbate pH and concentration, as well as the dose of adsorbents. The methylene blue (MB) adsorption process of TKAC was in accordance with the Langmuir isotherm model and followed a pseudo-second order mechanism. The adsorbing capacity of TKAC was 505.050 mg/g at 303 K while the BET surface area was 349.400 m 2 /g. Thermodynamic analysis demonstrated the spontaneous and endothermic properties of the entire adsorption process. The MB adsorption of the NA/AC aerogel satisfied the Langmuir isotherm and Freundlich isotherm models. Moreover, the MB adsorption on the NA/AC aerogel followed a pseudo-second order mechanism. The adsorbing capacity of the NA/AC aerogel was observed to be 465.120 mg/g at 303 K while the BET surface area was 100.690 m 2 /g. Thermodynamic investigation demonstrated a spontaneous and exothermic nature of the overall adsorption process. The MB adsorption of the NA/GO aerogel aligned with the Langmuir isotherm model and followed pseudo-second order mechanism. The adsorbing capacity of NA/GO aerogel was found to be 537.630 mg/g at 303 K, while the BET surface area was 5.050 m 2 /g. Furthermore, thermodynamic studies exhibited spontaneous and exothermic properties of the entire adsorption process.
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CHEMOSPHERE
·
2020
·
IF 5.778
Farid Mzee Mpatani,Aaron Albert Aryee,Alexander Nti Kani,Qiehui Guo,Evans Dovi,Lingbo Qu,Zhaohui Li,Runping Han
The presence of emerging micropollutants and dyes in water resource has raised global concern about their intense effects to aquatic environments, ecosystem and human health in general. So far, various adsorbents have been suggested for reducing the levels of bisphenol A, methylene blue and neutral red contamination in wastewaters. However, a number of these adsorbents seemed to have low adsorptive capacities and regeneration performances. In view of these, batch experiment was performed to decontaminate these pollutants from aqueous solutions using an optimized bagasse-β-cyclodextrin polymer (SB-β-CD). Characterization studies of SB-β-CD were performed using FTIR , pH point of zero charge, XRD and BET methods. Adsorption of BPA, MB and NR was favored at lower temperature (298 K) and pH of 7.0, 9.0 and 6.0, respectively. The maximum adsorption capacity of BPA, MB and NR at 298 K was 121, 963 and 685 mg g −1 , respectively. Hydrogen bonding through host-guest inclusion and electrostatic interactions could respectively attribute to uptake of BPA and MB/NR onto SB-β-CD. Adsorption kinetics of three pollutants followed pseudo-second-order model. Langmuir and Freundlich models were fitted to describe the adsorption of BPA and MB/NR, respectively. Thermodynamic parameters confirmed the occurrence of physical adsorption which is spontaneous and exothermic in nature. SB-β-CD loaded with BPA and MB/NR was certainly reused by 75% ethanol and 0.1 mol L −1 HCl solutions, respectively. Novel SB-β-CD showed better adsorptive capacity and regeneration performances; consequently can offers practical application for removal of BPA, MB and NR from wastewaters.
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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 2
·1171-1191
·
IF 6.123
Tu Chao,Sun Zenghui,Huang Fei,Wu Ziwei,Chen Hang
The photocatalytic process is an energy-saving and high-efficiency wastewater treatment technology. In this work, a simple in-situ hydrothermal method was used to prepare a photocatalytic material based on waste loofah with high efficiency, reusability and excellent heterostructure to improve the photodegradation efficiency. The prepared MoS 2 @MIL-101(Fe)@Carboxylated loofah composite material was characterized by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), UV–Vis diffuse reflection spectroscopy (UV–vis DRS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transient photocurrent (TPC). The composite material demonstrated high adsorption capacity for hydrochloride (TC) and methylene blue (MB) and photocatalytic capacity under visible-light irradiation at room temperature which were attributed to the porous structure, strong visible-light absorption, and low recombination velocity of electron–hole pairs due to the heterojunctions. The loofah sponge used as a substrate can provide a means for powder catalyst recovery and waste cellulose recycling. Meanwhile, the photocatalyst proved excellent stability in the MB degradation experiment and could be reused for four cycles.
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Environmental Technology & Innovation
·
2019
·
IF 2.8
Lei Xu,Chen Chen,Jiang-Bo Huo,Xiaoxiao Chen,Jia-Cheng E. Yang,Ming-Lai Fu
Lithium iron phosphate (LiFePO 4 ) batteries occupy the largest current Chinese market share of lithium-ion batteries, resulting in a large number of waste LiFePO 4 batteries needed to be considered. In this paper, iron hydroxyphosphate composites (FPOH) derived from waste LiFePO 4 lithium-ion batteries through hydrothermal treatment as environmental functional materials was firstly investigated. It is found that the cathode scraps and aluminum foil can be easily separated, making the recovery of aluminum foil simple. FPOH can be applied to adsorption of heavy metal and degradation of organic dye. Based on adsorption kinetic, isotherms and analysis of products after adsorption of lead, lead hydroxyphosphate was indicated to be formed and the maximum adsorption capacities of FPOH for Pb(II) was 43.203 mg/g. FPOH can also effectively degrade organic dyes of methylene blue in 12 h and the degradation mechanism can be suggested as Fenton-like catalysis evident by radical quenching test. This report provides a promising method for recycling waste LiFePO 4 batteries for the preparation of functional materials applied in environmental remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Fucheng Guan,Jing Tao,Qiang Yao,Zheng Li,Yihang Zhang,Shi Feng,Jianbin Sun,Qiang Yang,Xuecui Song,Jing Guo,Yuanfa Liu
Developing adsorbent materials based on biomass that can be easily recycled and reused to remove water pollutants has received widespread attention. A novel method for the preparation of calcium alginate/poly (vinyl alcohol)/boric acid (as–synthesized Ca-APB) aerogel fibers for highly efficient adsorption of methylene blue by directed freezing wet–spinning was presented in this paper. The Ca-APB-0.5 aerogel fibers exhibited a hierarchical structure consisting of a honeycomb micron pore structure with mesopores walls, with a maximum adsorption capacity of 508.99 mg/g in 5 h at 293 K. Meanwhile, the experimental data for Ca-APB-0.5 aerogel fibers showed the best fit to the Freundlich model and pseudo–second–order model. Moreover, the adsorption capacity was investigated for three consecutive cycles, with 469.37, 457.19, and 439.77 mg/g in the first, second, and third cycles, respectively. This paper proves that the hierarchical structure of alginate-based aerogel fiber is an effective dye adsorption material with high efficiency, reusability, and eco-friendliness.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Shifeng Zhao,Yanping Zhao,Zhiming Wu,Fengzhu Lv,Guocheng Lv,Libing Liao
Ferroan brucite with different Fe 2+ doping amount (MgFe(OH) 2 -x, x = 0.05, 0.1, 0.15, 0.2 and 0.3) were prepared for the removal of organic dyes from wastewater. In the presence of O 2 , MgFe(OH) 2 -0.3 could realize superhigh amount of removal (2069.16 mg/g) toward congo red (CR) and ultrafast removal rate toward methylene blue (MB), reaching equilibrium in about 5 min. Removal mechanism of MgFe(OH) 2 -0.3 for CR and MB was explored to verify the treatment nature. For CR, multiple removal mechanisms, such as interlayer immobilization/electrostatic attraction/hydrogen bonding and degradation were confirmed to coexist which accounted for 47.80% and 52.20% of the total removal amount. The degradation was highly related to the evolution of Fe 2+ in MgFe(OH) 2 . While hydrogen bonding and degradation played major role in MB removal. The removal behavior of CR and MB in co-existing case and in presence of competitive ions were also measured. MgFe(OH) 2 -0.3 showed almost uninfluenced removal behavior toward CR and the reason was clarified by calculating the binding energy based on molecular simulation. Ferroan brucite not only showed excellent removal ability toward different kinds of dyes but also worked on heavy metals. This work provided an excellent strategy for application of ferroan brucite.
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