Desalination and Water Treatment
·
2024
·
IF 1
Yanlong Sun,Tong Zheng,Guangshan Zhang,Bei Liu,Peng Wang,Afed Ullah Khan
ABSTRACT This work focuses on the synthesis of microwave absorbing-catalytic multifunction novel adsorbent. During adsorbent design secondary pollution produced by adsorbent regeneration is continuously neglected, which motivates the author to load catalyst on adsorbent to enhance the mineralization of adsorbed organic compounds during thermal regeneration. Microwave absorption fuels the synthesis and regeneration of adsorbent. The morphology and structure of composite adsorbent are analyzed by X-ray diffraction, scanning electron microscope-energy dispersive spectrometer, transmission electron microscope, and Brunauer–Emmett–Teller-Barrett–Joyner–Halenda method. The results show that the synthesized composite adsorbent is mesoporous with wide pore diameter distribution and 252 m 2 /g specific surface area. The host of composite adsorbent is γ-Al 2 O 3 and the loaded catalyst is amorphous manganese oxides. The synthesis process of composite adsorbent is designed and evaluated by the response surface methodology using a Box–Behnken design method. After optimization, the optimal adsorption capacity of composite adsorbent can reach up to 135 mg/g, and more than 47% tetracycline can be mineralized into H 2 O and CO 2 during 5 min regeneration. The properties of the composite material can be changed by adjusting synthesis condition. These designed functions of material will make adsorbent more adaptable to meet the growing demand of the environmental standard.
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
ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2020
·Vol. 192
·期 6
·1-9
·
IF 1.903
Li Xuguang,Elgarhy Abdelbaky Hossam,Hassan Mohamed Elfatih,Chen Yanbo,Liu Guanglong,ElKorashey Reham
Existing research on phosphorus removal from wastewater mostly focused on inorganic phosphorus while ignoring organic phosphorus, which has potential bioavailability. This study aims to provide an innovation for the development of advanced treatment material for both inorganic and organic phosphorus removal in water. In this study, ferrihydrite loaded on the graphene oxide (FeOOH-GO) composite adsorbent was synthesized by surface precipitation method, and its ability to remove both phosphate and diazinon as forms of inorganic and organic phosphorous from water was investigated. Characterization of the loaded composite using X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform-infrared spectroscopy (FTIR) indicated that FeOOH was successfully loaded onto graphene. The results of batch adsorption experiments showed that the adsorbent could remove both inorganic and organic phosphorus compounds simultaneously from water. When FeOOH content is 40%, the equilibrium adsorption amount of FeOOH-GO composite adsorbent for phosphate and diazinon was 5.81 and 23.20 mg g −1 , respectively. Environmental parameters such as pH and initial concentration have important influence on phosphorus removal by FeOOH-GO composite adsorbent and the removal efficiency of the inorganic and organic phosphorus from water decreases by increasing the initial concentration of phosphate and diazinon and the pH. It was concluded that the FeOOH-GO composite adsorbent has great potential to remove both inorganic and organic phosphate simultaneously from contaminated water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
Water
·
2024
·Vol. 16
·期 17
·2446
·
IF 3
Hongxia Du,Zihan Wang,Kinjal J. Shah,Yongjun Sun
In this article, attapulgite (ATP) as a raw material, hexadecyltrimethylammonium bromide (CTAB) as a modifier, and chitosan (CTS) as a composite are used to prepare a natural mineral-based composite adsorbent CTAB-ATP/CTS for the adsorption of norfloxacin in water. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and specific surface area (BET) were used for characterization. When the initial pH is 7, the dosage of adsorbent is 3 g/L, and the initial concentration of norfloxacin is 50 mg/L, the reaction temperature is 25 °C, the shaking time is 4 h, and the maximum removal rate and adsorption capacity of CTAB-ATP/CTS for norfloxacin reached 94.62% and 23.66 mg/g, respectively. The adsorption of norfloxacin by CTAB-ATP/CTS is more consistent with the pseudo-second-order kinetic model (R2= 0.9999, 0.9998, 0.9999 at initial concentrations of 25 mg/L, 50 mg/L, 75 mg/L), and the Langmuir isotherm adsorption model(R2= 0.9903, 0.9935, 0.9933 at temperatures of 25 °C, 30 °C, 35 °C), indicating that the adsorption process of the composite material is controlled by chemical adsorption and its adsorption behavior is mainly single-layer adsorption.
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
·
2022
·
IF 16.744
Lurong Ge,Yaohui Feng,Yanjun Dai,Ruzhu Wang,Tianshu Ge
Composite sorbents with hygroscopic salts (like LiCl and CaCl 2 ) impregnated porous matrixes obtained special attention in the past years, especially for solid desiccant dehumidification. However, the drawback of strong corrosivity limited their practical implementation. Alternatively, ionic liquid (1-ethyl-3-methylimidazole acetate) with less corrosivity is confined into ordered mesoporous MCM-41 to fabricate composite sorbent in this study, overcoming the poor mass transfer or limited adsorption capacity of single sorbent. Comprehensive characterizations including SEM, TEM, XRD, FTIR and N 2 adsorption prove that the ionic liquid is encapsulated in ordered channels of MCM-41. Sorption isotherms and kinetics indicate that the composite sorbent has superior water sorption performance (0.5 g/g at 20 °C/70 % RH), fast sorption rate under wide humidity range and potential of low temperature-driven regeneration. Moreover, the leakage test and corrosion experiment reveal that the composite sorbent has long-term stability and is corrosion-free to metal components. Further, the dehumidification performance using desiccant coated heat exchanger with reported composite sorbent is evaluated, showing 5 times higher dehumidification capacity than that of MCM-41 and 2 times higher than traditional silica gel (typical ARI summer, 35 °C, 40 % RH). This study identifies a feasible way of using ionic liquids to develop energy-efficient, safety-ensured and low-cost composite sorbents for water sorption-related applications.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19927-19939
·
IF 3.925
Xiangcheng Shan,Liyu Yang,Huarong Yang,Guilin Song,Zuoyi Xiao,Chang-sik Ha,Shangru Zhai,Qingda An
The eutrophication of water bodies caused by excessive phosphate discharge has always been a hotspot issue that needs to be addressed urgently. However, the fabrication of a practical capturer with high phosphate affinity remains a challenging task. In this work, a novel type of composite adsorbent (D301-Ce+) was synthesized, aiming for efficient and selective phosphate capture from wastewater. Characterizations including FTIR spectroscopy, XRD, and SEM confirmed the successful synthesis of the composites with multiple functionalities. It was shown that the maximum phosphate adsorption capacity of D301-Ce+ was 246.74 mg P g−1 because of the porous matrix of the weak basic anion exchange resin of D301 jointly modified with cerium and cationic polymeric layers. Adsorption kinetics and thermodynamics experiments confirmed that the intra-particle diffusion dominated phosphate adsorption, and the process was spontaneously endothermic naturally. Recycling studies indicated that this newly fabricated sorbent behaved with excellent reusability. Most importantly, in the presence of coexisting anions (Cl−, NO3−, SO42−, and HCO3−), D301-Ce+ exhibited a strong selectivity for phosphate, which could be attributed to the high affinity of the cerium component toward phosphate. For practical purposes, fixed-bed column experiments demonstrated that the Thomas model fitted the parameters better. By virtue of component optimization and sorption testing, the capturing mechanism could be fully described as electrostatic attraction and inner-sphere complexation.
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
Natural Sciences
·
2022
·Vol. 3
·期 1
·e20220038
·
IF 0
Chunfeng Li,Quanwen Pan,Wenjun Ying,He Shan,Ruzhu Wang,Hua Zhang,Jiayun Wang
Sorption-based atmospheric water harvesting (SAWH) is a promising technology that can potentially alleviate global shortages of water, especially in arid regions. However, current SAWH devices are difficult to scale up and exhibit significant disadvantages in terms of their cost, portability and efficiency. Herein, we report a portable and efficient atmospheric water-harvesting device with scalable and low-cost high-performance lithium-containing membrane-encapsulated composite sorbents. We use the thermodynamic framework for moist air states to develop the device with a structure featuring hollow insulation grid that harnessed the large temperature difference between the sorbent and the condenser, and thus, the water yield of SAWH device was increased by 20.5%. In outdoor experiments, it achieved an ultra-high water productivity of 34.8 g water /kg device and 1399.28 g water /(m 2 day) and an exceptionally low water-extraction cost of $2.65/kg water per cycle. Thus, this scalable and efficient passive SAWH device demonstrates the possibility of achieving low-cost and reliable water production in real scenarios and paves the way for practical applications of SAWH. Key points Water harvesting cost-efficient sorbent Heat and moisture transfer optimization
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
RSC Advances
·
2024
·Vol. 14
·期 33
·23606-23620
·
IF 3.9
Xinyi Yang,Jingjing Liu,Xuejin Huang,Hemin Cui,Ligang Wei,Guolin Shao,Xu Fu,Na Liu,Qingda An,Shangru Zhai
The cost-effective and green separation of dye pollutants from wastewater is of great importance in environmental remediation. Industrial seaweed residue (SR), as a low-cost cellulose source, was used to produce carboxylated nanorized-SR (NSR) via oxalic acid (OA)–water pretreatments followed by ultrasonic disintegration. Fourier transform infrared spectroscopy, X-ray polycrystalline diffraction, nitrogen isotherms, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, X-ray photoelectron spectrometry, particle charge detection, zeta potential and retro titration experiments were utilized to explore the physiochemical properties of samples. The NSRs with carboxyl content of 4.58–6.73 mmol g−1 were prepared using 10–60% OA–water pretreatment. In the case of 20% OA–water pretreatment, the highest NSR yield (73.9%) and nanocellulose content (80.2%) were obtained. Through self-assembly induced by the electrostatic interaction, magnetic NSR composite adsorbents (MNSRs) were prepared with the combination of NSR and Fe3O4 nanoparticles (NPs). The carboxylated NSR with negative charge demonstrated good affinity for Fe3O4 NPs. The Fe3O4 NPs were perfectly microencapsulated with the NSR when the NSR/Fe3O4 mass ratio was higher than 1/1. The adsorption properties of the MNSR for methylene blue (MB) removal from aqueous solution were investigated. The adsorbent with NSR/Fe3O4 mass ratio of 1/1 (MNSR1/1) exhibited optimum performance in terms of the magnetic properties and adsorption capacity. The MNSR1/1 showed high adsorption ability in a pH ≥7 environment. According to the Langmuir fitting, the maximum adsorption capacity of MNSR1/1 for MB reached 184.25 mg g−1. The adsorption of MB complies with the pseudo-second-order kinetic model. MNSR1/1 still maintained good adsorption properties after the fifth cycle of adsorption–desorption. MNSR1/1 could selectively adsorb cationic dye (i.e., MB and methyl violet) from wastewater, with hydrogen bonding and electrostatic interaction as the main force.
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 CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Beihan Wang,Fangxian Li,Pengfei Yang,Yerong Yang,Jie Hu,Jiangxiong Wei,Qijun Yu
Carbon nanotubes (CNTs) were synthesized on a Ni catalyst–diatomite substrate using a chemical vapor deposition (CVD) method. By controlling the synthesis conditions, we explored the influence of synthesis time and temperature on the synthesis of CNTs. The carbon yield and microstructure of the resulting CNTs were investigated by thermogravity (TG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy analysis. Then, two kinds of purification methods, annealing and acid treatment, were used on the synthesis products, diatomite–CNT, and can effectively increase the specific surface area of the product. The adsorption behaviors of diatomite–CNT composite adsorbents for phenolic compounds have been investigated. The adsorption experiments showed that the adsorption process reached equilibrium quickly, while the adsorption kinetics followed the pseudo-second-order model and the adsorption isotherm followed the Langmuir model well, respectively. The thermodynamics parameters indicated that the adsorption behavior is an exothermic process performing spontaneously. The diatomite–CNT adsorbent will perform well for removal of phenolic compounds from wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiaoyan Zhu,Jiaqi Tong,Lihui Zhu,Daodong Pan
In this study, a method for the in situ growth of zeolitic imidazolate framework-8 (ZIF-8) on carboxymethyl chitosan beads (BCMC) to produce a composite adsorbent (BCMC@ZIF-8) for the removal of Pb 2+ from water is proposed. The results revealed that the utilization of the BCMC as a framework enhanced the stability of ZIF-8, and the presence of the latter in the composite improved the removal efficiency of Pb 2+ from water. Data from X-ray photoelectron spectroscopy analysis and adsorption kinetics revealed that the adsorption mechanism included diffusion and the sharing/transfer of electrons between BCMC@ZIF-8 and Pb 2+ . The maximum adsorption capacity of BCMC@ZIF-8 fitted using the Langmuir model was 566.09 mg/g. Results of the experiments on the regeneration of the adsorbent and its stability in water further indicated that BCMC improved the stability of ZIF-8. This study demonstrated that the stability of metal-organic framework (MOF) materials, which exhibited high efficiencies for the removal of heavy metals in water can be improved through fixation of the polymer skeleton. Thus, the present study offers practical and theoretical guidance for the application of MOF materials in water 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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Dandan Hao,Ping Wang,Ju Liu,Huanhui Zhan,Tiantian Zhou,Bo Fu
MOF-199 is considered to be an excellent CO 2 adsorbent owing to its substantial specific surface area, suitable pore structure and abundant sorption sites. However, powdered MOF-199 is prone to agglomeration and has poor recyclability. Herein, we proposed a MOF-199-based adsorbent by combining the MOF synthesis process with traditional papermaking process. Through such a design, MOF-199 particles are adhered on the surface of wood pulp fiber. The sufficient hydroxyl groups and electrostatic forces of cellulose facilitates the homogeneous and tight adhesion of MOF crystals. The optimal MP-4 sample demonstrated a high CO 2 adsorption capacity (1.80 mmol·g ‐−1 at 25 °C) and good CO 2 /N 2 selectivity (30.06). Moreover, the composite sorbent can be easily regenerated. The adsorption mechanism was analyzed by the density functional theory approach. The simulation results showed that the carboxyl functional groups with a large number of oxygen atoms and active metal sites are the key to boost the CO 2 adsorption performance.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Dezhi Yang,Lingbing Qiu,Yaling Yang
Glutaraldehyde cross-linked chitosan-coated Fe3O4 nanocomposites (MCNPs) were successfully synthesized for the removal of methyl orange (MO) from wastewater. Experimental conditions such as the pH, cation surfactant dosage, nanoadsorbent dosage, and ionic strength were also investigated. Kinetics date was better fit by a pseudo-second-order model, indicating that adsorption was the rate-limiting step. The Freundlich models (R2 = 0.9794) fit the experimental data better than the Langmuir models, and the theoretical maximum adsorption capacity was 758 mg g–1. The values of the Gibbs free energy (ΔG° = −7.27 kJ mol–1), enthalpy (ΔH° = 0.001 kJ mol–1), and entropy (ΔS° = 23.58 J mol–1) indicated the spontaneous and endothermic process of MO adsorption. The prepared MCNPs showed 96–98% adsorption of MO by adding 0.2 mg of cationic surfactant cetyltrimethylammonium bromide (CTAB) to form mixed hemimicelles and can be easily regenerated with a 0.1 mol L–1 HCl solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2018
·Vol. 6
·期 3
·035601
·
IF 1.151
Xinhui Duan,Wei Hong,C Srinivasakannan,Xin Wang
Hydrochar synthesized using hydrothermal carbonization of walnut biomass, is found to be rich in surface functional groups, having low surface area, high pore diameters, as a result poor adsorption capacity. The present work attempts to modify hydrochar, using silicate via a one-step hydrothermal route. The hydrochar silicate composite (HS) exhibited porosity with surface area of 106 m2 g−1 and excellent adsorption capabilities for methylene blue (MB) (434.78 mg g−1) at 35 °C. The adsorption capacity of the HS was found to be superior as compared to hydrochar and silicate. The adsorption isotherms as well as the adsorption kinetic data of HS were well describied by the Langmuir adsorption model and the pseudo-second order kinetic model. The adsorption was physical and the adsorption mechanism was partly controlled by the intraparticle diffusion. The study identified HS to be a potential low cost adsorbent for liquid phase adsorption involving high molecular weight compounds.
研究领域:
环境科学
·
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）