Surfaces and Interfaces
·
2023
·
IF 6.2
Xiangyue Wei,Yixin Pan,Jisheng Kou,Rui Huang
The removal of selenium (IV) from aqueous solutions was the focus of research that led to the discovery of a novel type of composite adsorbent called FeS@h-BN nanocomposite . This adsorbent was studied, characterized, and put to use in a fixed bed column. SEM, FTIR, XRD, and XPS analyses were conducted to learn more about the coated layer's surface properties. The effect of several adsorbent materials on the remediation of Se(IV) in dynamic water was examined. The Adams-Bohart model, the Thomas model, and the Yoon-Nelson model were all utilized to get optimal fits to the kinetic data obtained from the adsorption process. Moreover, the Adams-Bohart model was only applicable to the beginning portion of the dynamic behavior of the FeS and FeS@h-BN columns. The Thomas and Yoon-Nelson models were sufficient for describing the breakthrough curve under all experimental conditions. For this dynamic process, the theoretical breakthrough curve profile was compared to an experimentally derived profile. It was discovered that FeS@h-BN nanocomposites are the most effective at removing Se(IV), and the adsorption of Se(IV) by a variety of adsorbent materials is enough for all three dynamic models.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xuan Zhang,Xiaofeng Fang,Jiansheng Li,Shunlong Pan,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang,Shuaifei Zhao
Arsenic-contaminated water has significant adverse impacts on human health and ecosystems. We developed a new adsorptive membrane by modifying the porous support layer of a phase inversion formed membrane for arsenic removal. Iron oxide (Fe 3 O 4 ) microspheres were immobilized in the support layer of the membrane by reverse filtration, followed by dopamine polymerization. The prepared adsorptive membrane was compared with a virgin membrane without Fe 3 O 4 microspheres and a Fe 3 O 4 blended membrane in terms of membrane structures and separation performance. The adsorptive membrane prepared by our new method had comparable water permeability and rejection performance with the virgin membrane without Fe 3 O 4 microspheres, but higher rejection performance and dynamic adsorption capacity than the membrane prepared by the conventional blending method. Both static and dynamic adsorption modes were used to evaluate the adsorption performance of the membranes. Our new adsorptive membrane also had excellent regeneration performance. After three regeneration cycles, the membrane was still capable of treating more than 2 tons of As-contaminated water/m 2 . The adsorptive membrane of 1 m 2 could treat over 7 tons of water to the drinking water standard in terms of arsenic concentration during three regeneration cycles. Therefore, our adsorptive membrane may pave a new way for arsenic removal from water and ensuring drinking water security.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Xiaofeng Fang,Jiansheng Li,Xin Li,Shunlong Pan,Xuan Zhang,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang
Novel ultrafiltration-adsorption membranes (UFAMs) were designed via decorating the walls of membrane internal pores with polydopamine (PDA) nanoparticles for heavy metals removal. Specially, self-polymerized dopamine solution was penetrated through the polyethersulfone (PES) UF membrane from reverse direction (i.e., from bottom to top) by circulatory filtration, leading to the formation of a PDA nanoparticle coating around the walls of finger-like pores (labeled as PES/PDA-R). The conventional PDA-decorated membrane (labeled as PES/PDA-F) prepared with forward filtration was used for comparison. The results indicated that the introduction of PDA nanoparticles on the walls of internal pores endowed the PES/PDA-R membrane with enhanced UF performance and remarkable adsorption capacity for heavy metals. PES/PDA-R membrane exhibited ascendant bovine serum albumin (BSA) rejection (92.9%) and maintainable pure water flux (166 L/m 2 h). The static adsorption capacities for Pb 2+ , Cd 2+ and Cu 2+ on PES/PDA-R membranes were 20.23 mg Pb/g, 17.01 mg Cd/g and 10.42 mg Cu/g, respectively, which are 1.69, 2.25 and 1.91 times higher than that of the PES/PDA-F membranes. Importantly, dynamic filtration experiments revealed 4.13 times adsorption capacity for Pb 2+ was achieved on PES/PDA-R membrane over PES/PDA-F membrane. The significant enhancement of dynamic adsorption capacity on PES/PDA-R membrane is derived from the three dimensional distribution of PDA nanoparticles on the cross section of PES membrane which provide the more active sites and increase the contact time between PDA and metal ions. This novel approach paves a way to design specific composite membranes for a cost-effective water treatment.
研究领域:
环境科学
·
材料科学
·
水处理工程
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xianghua Wu,Zhiheng Zhang,Haiying Lin,Qingge Feng,Bin Xue,Mingen Li,Zixuan Chen,Jiatong Lv,Lianghong Li
The use of chitosan-based sponge materials for Hg(II) removal has gained attention recently due to their effectiveness. However, the complex preparation, limited performance, and poor acid resistance remained major drawbacks. Herein, a nitrogen‑sulfur functionalized macroporous chitosan sponge was successfully synthesized via two mild amidation reactions and exhibited abundant interconnected mesopores. These features endowed the functionalized chitosan-based sponge with high adsorption capacity (1227.15 mg g −1 ), fast reaction rate (8.27 × 10 −3 g mg −1 ·min −1 ), broad pH adaptability (1–7), and high selectivity, even in the artificial chlor-alkali wastewater. Furthermore, the impressive saturation capacity of 1329.24 mg g −1 was achieved in various heights and injection rates in the fixed-bed column test, and the good removal efficiency (>85 %) was maintained after six dynamic regeneration cycles. The excellent performance was primarily attributed to the chemisorption of C S groups. Among the three machine learning models, the ANFIS algorithm owned the best results of the smallest RMSE (0.00315) and highest R 2 (0.9752) for predicting dynamic adsorptive behaviors. Overall, this research provided a reference for preparing a promising mesoporous sponge as an alternative recyclable and efficient candidate for industrial wastewater treatment and offered a machine learning model to predict the dynamic adsorptive performance.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Xuejing Qiu,Huiping Hu,Jinpeng Yang,Caixia Wang,Zeying Cheng
The selective removal of copper from the artificial nickel electrolysis anolyte was presented with a novel N-octyl-2-aminomethylpyridine-funcionalized chelating resin (abbreviated as CP-AMPO) in this study. In the single system, the adsorption characters of the CP-AMPO resins for Cu2+ and Ni2+ were examined through pH of solution, concentration of metal ions, contact time and temperature. Through the experimental investigation, the isotherm adsorption behavior of Cu2+ fitted well with Langmuir isotherm, whereas the adsorption behavior of Ni2+ followed the Langmuir and the Freundlich isotherm. The kinetic adsorption parameters were proved to be in agreement with the pseudo-second kinetic model, the thermodynamics data demonstrated the adsorption behaviors of Cu2+ and Ni2+ were a spontaneous and endothermic process. Additionally, from the competitive adsorption in the binary systems, the separation factor of copper/nickel reached 2000, indicating higher selectivity for copper over nickel. Moreover, the residual concentration of copper was less than 3 mg/L at the beginning of 8 BV in the artificial nickel electrolysis anolyte after purification and the mass ratio of copper/nickel exceeded 15 in the saturated resins by the dynamic adsorption curves. The results could well satisfy the production requirement of the nickel electro-refining procedure. Therefore, the CP-AMPO resins could be used as the high-performance adsorbent to remove copper from the nickel electrolysis anolyte in the large-scale industry. Consequently, the extended study of the chelating resin on the mechanisms of selective adsorption for copper and nickel was assessed by X-ray photoelectron spectroscopy (XPS).
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zimu Liu,Mingtai Li,Zitong Zhao,Yulong Yang,Linlin Deng,Baojuan Dou,Feng Bin
In recent years, the adsorption and separation of ammonia (NH 3 ) from airflow have attracted growing attention. However, there is a need to further enhance the adsorption capacity of adsorbents. In this study, the amino-functionalization of UiO-66 was investigated to evaluate its dynamic NH 3 adsorption performance by varying the type and proportion of organic ligands. It was observed that the introduction of amino groups significantly enhanced the ammonia adsorption capacity by 78.5 %, despite a minor reduction in specific surface area and pore size. Combined with the results of density functional theory and in-situ infrared, the enhanced adsorption ability can be ascribed to the functionalization increasing the polarity within the pore, thereby strengthening interactions with ammonia molecules through weak hydrogen bonding.
研究领域:
环境科学
·
材料科学
·
化学工程
·
吸附技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yizhen Cheng,Jingrui Yang,Jimin Shen,Pengwei Yan,Shan Liu,Jing Kang,Lanbo Bi,Binyuan Wang,Shengxin Zhao,Zhonglin Chen
Heteroatom doping technology is of great significance for adsorption. However, the effect of P with relatively lower electronegativity (2.19) doped in the π-electron system and phosphorus-containing functional groups on the adsorption has always been neglected. Herein, P-doped biochar (PBC) was successfully synthesized via the in-situ activation method and applied in a bath experiment and a long-term fixed-bed dynamic adsorption for sulfamethoxazole (SMX) removal. Compared to pristine BC, the pH pzc , ash content and graphitization degree of PBC would be reduced significantly after phosphoric acid (H 3 PO 4 ) was treated, but it gained a large specific surface area (SSA = 233 m 2 g −1 ), as well as abundant surface functional groups. In the adsorption process, the behavior of SMX adsorbed onto PBC conformed to pseudo-second-order kinetic and Langmuir models in batch experiments. Its excellent adsorption capacity (148.62 mg g −1 ) benefited from a large number of functional groups. DFT calculation indicates that the C 3 -P-O configuration mainly promoted the adsorption of SMX. It is speculated that the hydrogen-bond interaction between SMX and C 3 -P-O was the main adsorption mechanism, and electrostatic and π-π EDA interaction also contributed. Various parameters during the dynamic process were thoroughly explored. The saturated adsorption capacity of the column would be promoted when influent SMX concentration and bed depth increased, but negatively correlated with solution pH and influent rate. Moreover, PBC fixed-bed column for SMX removal was well fitting Thomas, Yoon-Nelson and BDST models, which provided a predictable strategy for practical application.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2018
·Vol. 1
·期 1
·389-394
·
IF 0
Linlin Zang,Ru Lin,Tianwei Dou,Lu wang,Jun Ma,Liguo Sun
Nanofibrous membranes have a high specific surface area and large porosity, which are beneficial for being used as adsorbents to remove heavy metal ions from water. In this work, electrospun nanofibers were wrapped with a hydrogel layer with a tunable thickness, which endowed the membrane with excellent superhydrophilic performance. Because of good water-retention properties and abundant functional groups originating from the hydrogel layer, as a static adsorbent, the maximum adsorption capacity of Pb(II) was up to 146.21 mg g−1 according to the Langmuir model. Meanwhile, the electrospun membrane also possessed water permeability as a flow-through membrane for dynamic adsorption, which was obviously different from traditional hydrogel adsorbents. As a result, the rejection ratio of Pb(II) can remain over 55% after running for 72 h under high pH conditions and at low initial ion concentrations. Apart from these, cycle operations confirmed the regeneration of the membrane, and competitive adsorption experiments illustrated the selective removal of Pb(II) in a mixed ion solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Jian Tian,Gen Li,Wang He,Kok Bing Tan,Daohua Sun,Junfu Wei,Qingbiao Li
Graphene oxide (GO) channels exhibit unique mass transport behaviors due to their flexibility, controllable thinness and extraordinary physicochemical properties, enabling them to be widely used for adsorption and membrane separation. Nevertheless, the adsorption behavior of nanosized contaminants within the channels of GO membrane has not been fully discussed. In this study, we fabricated a GO membrane (PG n , where n represents the deposition cycles of GO) with multi channels via the cross-linking of GO and multibranched poly(ethyleneimine) (PEI). Phenol was used as molecular probe to determine the correlations between dynamic adsorption behavior and structural parameters of the multilevel GO/PEI membrane. PG8 shows higher adsorption capacities and affinity, which is predominantly attributed to the multichannel structure providing a large specific surface for phenol adsorption, enhancing the accessibility of active sites for phenol molecules and the transport of phenol. Density functional theory calculations demonstrate that the adsorption mechanism of phenol within GO channel is energetically oriented by hydrogen bonds, which is dominated by oxygen-containing groups compared to amino groups. Particularly, the interfaces which facilitate strong π-π interaction and hydrogen bonds maybe the most active regions. Moreover, the as-prepared PG8 membrane showed outstanding performance for other contaminants such as methyl orange and Cr(VI). It is anticipated that this study will have implications for design of GO-related environmental materials with enhanced efficiency.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ting-Ting Hu,Fang Liu,Shuai Dou,Lu-Bin Zhong,Xuan Cheng,Zai-Dong Shao,Yu-Ming Zheng
The toxic and corrosive gaseous ammonia (NH 3 ) poses serious environmental and health risks. However, removal of low concentration NH 3 from air remains challenging. In this work, a SO 3 H-modified silica xerogel (MPTS-X) with good porous structure stability and abundant Bronsted acid sites was fabricated, and its physicochemical properties and adsorption performance for NH 3 were systematically investigated. Static adsorption experiments showed the MPTS-1.0 had high NH 3 adsorption capacity of 4.02 mmol⋅g −1 at 0.1 bar and 7.00 mmol⋅g −1 at 1.0 bar, which was much higher than that of MPTS-0 (3.19 and 1.95 mmol⋅g −1 ). Langmuir-Freundlich isotherm model fitted the experimental data of NH 3 adsorption well, implying that the MPTS-1.0 surface is not homogeneous and there are different adsorption sites, which was further confirmed by temperature programmed desorption spectrum analysis. According to IAST calculation, the adsorption selectivity of MPTS-1.0 for NH 3 /N 2 (1: 9) and NH 3 /CO 2 (1: 1) was 6175 and 165 at 1.0 bar, respectively, indicating the MPTS-1.0 has excellent adsorption selectivity. Dynamic adsorption experiments and field test demonstrated the MPTS-1.0 could quickly capture trace NH 3 , even if the initial concentration is as low as 2 ppm. Successive adsorption–desorption experiments demonstrated the MPTS-1.0 had good regenerability. In-situ infrared spectroscopy analyses indicated NH 3 adsorption on the MPTS-1.0 was mainly due to hydrogen bonding interaction and proton transfer to form Si-OH … NH 3 and -SO 3 - NH 4 + , respectively. NH 3 molecules bound firmly to acidic sites on the xerogel surface, which reduced re-release risk. This work may provide a feasible way to develop promising adsorbents for the removal of gaseous ammonia from air.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chen Yang,Hua-Rong Yang,Shan-Shan Li,Qing-Da An,Shang-Ru Zhai,Zuo-Yi Xiao
A separable spherical bio-adsorbent (CMC-Cr) was prepared for capturing heavy metal ions by simple coordination and cross-linking between targeted ions of Cr 3+ and carboxymethyl cellulose (CMC). A simple alternation of the CMC incorporation allowed the interconnected networks within the microspheres of preformed solid CMC to be adjusted. The excellent network structure could achieve the maximum collision between the adsorbent and the heavy metal cations in the wastewater. Through investigations, CMC-Cr-2 beads were determined as the optimal adsorbent. The adsorption performance of novel materials was evaluated by examining their adsorption behavior on Pb(II) and Co(II) under both static and dynamic conditions. The results showed that the adsorption behavior of CMC-Cr-2 beads on both two heavy metal cations could be fully reflected by the Freundlich model. Under the theoretical conditions, the maximum adsorption capacities were 97.26 and 144.74 mg/g. The kinetic results for the adsorption of two heavy metal cations on CMC-Cr-2 beads were consistent with the Pseudo-second-order kinetic model. Moreover, the correlation coefficient of the Thomas model was significant in the dynamic adsorption performance tests. Five regeneration cycle studies were successfully carried out on CMC-Cr-2 beads to evaluate reusability and stability. The applicability of CMC-Cr-2 beads in authentic aqueous solutions (both the single and binary pollutant systems) was also studied, and the results indicated that CMC-Cr-2 beads had a high potential for practical implementation. Furthermore, by analyzing the surface interactions of two heavy metal cations with the CMC-Cr-2 beads based on FTIR and XPS characterization, a basic understanding of the interaction between bio-sorbents and pollutants in wastewater can be obtained.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Song He,Tao He,Qilin Chen,Xiaoben Zhao,Peng Xiao,Xiaobing Yang
An innovative “material-component-whole” evaluation model was used to assess the overall protective performance of gas masks against ammonia. Coconut shell-based carbon (AC-S), coconut shell-impregnated carbon (ACCu-S), coal-based carbon (AC-C), and coal-impregnated carbon (ACCu-C) were chosen as the adsorbents for this study. The physicochemical characteristics of the activated carbon samples were analyzed through SEM, BET, FT-IR, EA, XPS and XRD tests. This research delves into the breakthrough curves of ammonia gas by the activated carbon and canisters under varying concentrations of ammonia, ambient temperatures, airflow velocities, and relative humidity, also exploring the breakthrough curves of ammonia gas by gas masks under different ammonia concentrations and airflow patterns while considering both dynamic and static adsorption of activated carbon. The empirical results show that increased levels of ammonia concentration, ambient temperature, and airflow velocities lead to decreased protection duration of activated carbon and canisters. Conversely, an elevation in the relative humidity within the ammonia gas stream results in an expansion of the protection time. This study found a linear correlation between the protection time of S and C canisters and the corresponding protection time of the impregnated carbon. Lastly, the protective time of gas masks in sinusoidal airflow mode is highlighted as having a more significant impact.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）