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Silva PF, Fernandes JV, Silva VC, Filho JIS, Rodrigues AM, Menezes RR, de Araújo Neves G. Brazilian bentonite/MgO composites for adsorption of cationic and anionic dyes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-35000-3. [PMID: 39322931 DOI: 10.1007/s11356-024-35000-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Accepted: 09/12/2024] [Indexed: 09/27/2024]
Abstract
Industrial effluents, especially those containing dyes, have become the main cause of contamination of water resources. In this context, Brazilian bentonite/MgO composites, with excellent adsorptive properties, were prepared and investigated for their effectiveness in removing cationic and anionic dyes from aqueous solutions. The new adsorbents were obtained using Brazilian bentonites and MgO using the mechanochemical method followed by heat treatment (at 700 °C for 4 h). Different characterization techniques were used for the chemical, mineralogical, thermal, surface, and morphological analysis of the raw clays and the composites. The experimental adsorption isotherms were quantified under different conditions of initial concentration, contact time, pH, adsorbent dosage, and temperature variation to interpret the adsorption mechanism of the crystal violet (CV) and Congo red (CR) dyes. The modeling results were obtained from the empirical Sips equation and Pseudo Second Order (PSO) kinetics, indicating that the adsorption of molecules is a heterogeneous phenomenon that occurs in a monolayer on the surface (ns > 1), with the adsorption rate determined by chemisorption. The composites showed the best removal efficiency performance compared to the raw bentonites, with an increase of 12% for the CV dye and 46% for the CR dye. In addition, the qmax values obtained were 423.02 mg/g and 479.86 mg/g (AM01). This research underscores the potential of Brazilian bentonite/MgO composites as a promising solution for the removal of cationic and anionic dyes from water, offering hope for future applications in the field of environmental engineering and materials science.
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Affiliation(s)
- Paulysendra Felipe Silva
- Graduate Program in Materials Science and Engineering, Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil.
- Laboratory of Materials Technology (LTM), Materials Engineering Academic Unit (UAEMA), Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil.
| | - Jucielle Veras Fernandes
- Graduate Program in Materials Science and Engineering, Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
- Laboratory of Materials Technology (LTM), Materials Engineering Academic Unit (UAEMA), Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
| | - Vanderlane Cavalcanti Silva
- Graduate Program in Materials Science and Engineering, Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
- Laboratory of Materials Technology (LTM), Materials Engineering Academic Unit (UAEMA), Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
| | - Josenildo Isidro Santos Filho
- Graduate Program in Materials Science and Engineering, Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
- Laboratory of Materials Technology (LTM), Materials Engineering Academic Unit (UAEMA), Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
| | - Alisson Mendes Rodrigues
- Faculty UnB Planaltina (FUP), Graduate Program in Materials Science (PPGCIMA), University of Brasília (UNB), Brasília, DF, 70904-910, Brazil
| | - Romualdo Rodrigues Menezes
- Laboratory of Materials Technology (LTM), Materials Engineering Academic Unit (UAEMA), Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
| | - Gelmires de Araújo Neves
- Laboratory of Materials Technology (LTM), Materials Engineering Academic Unit (UAEMA), Federal University of Campina Grande (UFCG), Campina Grande, PB, 58429-900, Brazil
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Zhang B, Zhu W, Hou R, Yue Y, Feng J, Ishag A, Wang X, Qin Y, Sun Y. Recent advances of application of bentonite-based composites in the environmental remediation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 362:121341. [PMID: 38824894 DOI: 10.1016/j.jenvman.2024.121341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Revised: 05/11/2024] [Accepted: 05/30/2024] [Indexed: 06/04/2024]
Abstract
Bentonite-based composites have been widely utilized in the removal of various pollutants due to low cost, environmentally friendly, ease-to-operate, whereas the recent advances concerning the application of bentonite-based composites in environmental remediation were not available. Herein, the modification (i.e., acid/alkaline washing, thermal treatment and hybrids) of bentonite was firstly reviewed; Then the recent advances of adsorption of environmental concomitants (e.g., organic (dyes, microplastics, phenolic and other organics) and inorganic pollutants (heavy metals, radionuclides and other inorganic pollutants)) on various bentonite-based composites were summarized in details. Meanwhile, the effect of environmental factors and interaction mechanism between bentonite-based composites and contaminants were also investigated. Finally, the conclusions and prospective of bentonite-based composites in the environmental remediation were proposed. It is demonstrated that various bentonite-based composites exhibited the high adsorption/degradation capacity towards environmental pollutants under the specific conditions. The interaction mechanism involved the mineralization, physical/chemical adsorption, co-precipitation and complexation. This review highlights the effect of different functionalization of bentonite-based composites on their adsorption capacity and interaction mechanism, which is expected to be helpful to environmental scientists for applying bentonite-based composites into practical environmental remediation.
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Affiliation(s)
- Bo Zhang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China; Research Center of Applied Geology of China Geological Survery, Chengdu, 610036, PR China
| | - Weiyu Zhu
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Rongbo Hou
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Yanxue Yue
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Jiashuo Feng
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Alhadi Ishag
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China; Department of Chemical Engineering, Faculty of Engineering and Technical Studies, University of Kordofan, El Obeid, 51111, Sudan
| | - Xiao Wang
- Research Center of Applied Geology of China Geological Survery, Chengdu, 610036, PR China
| | - Yan Qin
- Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, PR China.
| | - Yubing Sun
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China.
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Wang YS, Huo TR, Wang Y, Bai JW, Huang PP, Li C, Deng SY, Mei H, Qian J, Zhang XC, Ding C, Zhang QY, Wang WK. Constructing mesoporous biochar derived from waste carton: Improving multi-site adsorption of dye wastewater and investigating mechanism. ENVIRONMENTAL RESEARCH 2024; 242:117775. [PMID: 38029815 DOI: 10.1016/j.envres.2023.117775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 10/31/2023] [Accepted: 11/04/2023] [Indexed: 12/01/2023]
Abstract
The development of cost-efficient biochar adsorbent with a simple preparation method is essential to constructing efficient wastewater treatment system. Here, a low-cost waste carton biochar (WCB) prepared by a simple two-step carbonization was applied in efficiently removing Rhodamine B (RhB) in aqueous environment. The maximum ability of WCB for RhB adsorption was 222 mg/g, 6 and 10 times higher than both of rice straw biochar (RSB) and broadbean shell biochar (BSB), respectively. It was mainly ascribed to the mesopore structure (3.0-20.4 nm) of WCB possessing more spatial sites compared to RSB (2.2 nm) and BSB (2.4 nm) for RhB (1.4 nm✕1.1 nm✕0.6 nm) adsorption. Furthermore, external mass transfer (EMT) controlled mass transfer resistance (MTR) of the RhB sorption process by WCB which was fitted with the Langmuir model well. Meanwhile, the adsorption process was dominated by physisorption through van der Waals forces and π-π interactions. A mixture of three dyes in river water was well removed by using WCB. This work provides a straightforward method of preparing mesoporous biochar derived from waste carton with high-adsorption capacity for dye wastewater treatment.
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Affiliation(s)
- Yan-Shan Wang
- School of Geographic Sciences, Nantong University, Nantong, 226007, China; Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China
| | - Tong-Rong Huo
- School of Geographic Sciences, Nantong University, Nantong, 226007, China
| | - Yan Wang
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230000, China
| | - Jia-Wen Bai
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China
| | - Ping-Ping Huang
- School of Geographic Sciences, Nantong University, Nantong, 226007, China
| | - Chen Li
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230000, China
| | - Shi-Yu Deng
- School of Geographic Sciences, Nantong University, Nantong, 226007, China
| | - Hong Mei
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230000, China
| | - Jun Qian
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230000, China
| | - Xiao-Chi Zhang
- School of Geographic Sciences, Nantong University, Nantong, 226007, China
| | - Chen Ding
- School of Geographic Sciences, Nantong University, Nantong, 226007, China
| | - Qiu-Yu Zhang
- School of Geographic Sciences, Nantong University, Nantong, 226007, China
| | - Wei-Kang Wang
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China.
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De Geest M, Michielsen B, Ciocarlan RG, Cool P, Seftel EM. Structured LDH/Bentonite Composites for Chromium Removal and Recovery from Aqueous Solutions. Molecules 2023; 28:4879. [PMID: 37375434 PMCID: PMC10305446 DOI: 10.3390/molecules28124879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/16/2023] [Accepted: 06/18/2023] [Indexed: 06/29/2023] Open
Abstract
This study focuses on chromium removal through adsorption and ion exchange using structured calcined layered double hydroxide (LDH) (MgAl)-bentonite composites. Firstly, the powders were structured into granulates to study the effect on Cr sorption kinetics to circumvent the limitations of working with powders in real-life applications. Secondly, the regeneration of the structured composites was optimized to enable multi-cycling operation, which is the key for their applicability beyond laboratory scale. Firstly, the LDH/bentonite ratio was optimized to obtain the best performance for the removal of Cr3+ and Cr6+ species. In powder form, the calcined adsorbent containing 80 wt% LDH and 20 wt% bentonite performed best with an adsorption capacity of 48 and 40 mg/g for Cr3+ and Cr6+, respectively. The desorption was optimized by studying the effect of the NaCl concentration and pH, with a 2 M NaCl solution without pH modification being optimal. The kinetic data of the adsorption and desorption steps were modelled, revealing a pseudo-second order model for both. This was also demonstrated using XRD and Raman measurements after the Cr3+ and Cr6+ adsorption tests, indicating successful uptake and revealing the adsorption mechanism. Finally, five consecutive adsorption-desorption cycles were performed, each showing nearly 100% adsorption and desorption.
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Affiliation(s)
- Mitra De Geest
- Laboratory of Adsorption & Catalysis, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Bart Michielsen
- VITO Flemish Institute for Technological Research, Boeretang 200, 2400 Mol, Belgium
| | - Radu-G. Ciocarlan
- Laboratory of Adsorption & Catalysis, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Pegie Cool
- Laboratory of Adsorption & Catalysis, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | - Elena M. Seftel
- VITO Flemish Institute for Technological Research, Boeretang 200, 2400 Mol, Belgium
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Kouassi NLB, Doubi BIHG, Diabate D, Blonde LD, Albert T. Recycling of Alum Sludge for Rhodamine B Removal from Industrial Effluents. CHEMISTRY AFRICA 2022. [DOI: 10.1007/s42250-022-00473-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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He H, Chai K, Wu T, Qiu Z, Wang S, Hong J. Adsorption of Rhodamine B from Simulated Waste Water onto Kaolin-Bentonite Composites. MATERIALS 2022; 15:ma15124058. [PMID: 35744117 PMCID: PMC9227572 DOI: 10.3390/ma15124058] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/28/2022] [Accepted: 06/02/2022] [Indexed: 11/18/2022]
Abstract
Organic dye rhodamine B is one of the common organic pollutants in the water and soil environment. This study investigated the feasibility of removing rhodamine B from an aqueous solution through adsorption by kaolin, kaolin-sodium bentonite, and kaolin-organic bentonite. Batch adsorption test results showed that the maximum adsorption quantities of kaolin, kaolin-sodium bentonite, and kaolin-organic bentonite were 7.76 mg/g, 11.26 mg/g, and 12.68 mg/g, respectively, implying that the addition of bentonite to kaolin can effectively improve its adsorption capacity for rhodamine B. Moreover, the Langmuir isotherm model is suitable to describe the adsorption of rhodamine B by kaolin and kaolin-sodium bentonite, while it is preferable to use the Freundlich isotherm model in the case of kaolin-organic bentonite. The adsorption kinetic characteristics of rhodamine B, by these three adsorbents, are suitable to be described with a pseudo-second order kinetic model. Furthermore, the characteristics of the above three adsorbents were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The above results indicated that kaolin and organic bentonite can be used to design efficient adsorbents for organic pollutants similar to rhodamine B.
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Affiliation(s)
- Haijie He
- College of Civil and Architectural Engineering, Zhejiang University, Hangzhou 310000, China;
- College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China; (K.C.); (J.H.)
- Fangyuan Construction Group Co., Ltd., Taizhou 317700, China
| | - Kuan Chai
- College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China; (K.C.); (J.H.)
- School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110000, China
| | - Tao Wu
- College of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, China
- Jiangsu Province Engineering Research Center of Geoenvironmental Disaster Prevention and Remediation, Jiangsu University of Science and Technology, Zhenjiang 212000, China
- Correspondence: (T.W.); (Z.Q.); (S.W.)
| | - Zhanhong Qiu
- College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China; (K.C.); (J.H.)
- Correspondence: (T.W.); (Z.Q.); (S.W.)
| | - Shifang Wang
- College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China; (K.C.); (J.H.)
- School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221018, China
- Correspondence: (T.W.); (Z.Q.); (S.W.)
| | - Jie Hong
- College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China; (K.C.); (J.H.)
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Silica Particles Derived from Natural Kaolinite for the Removal of Rhodamine B from Polluted Water. Processes (Basel) 2022. [DOI: 10.3390/pr10050964] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
This manuscript deals with the thermal and chemical modification of a natural kaolinite that shows excellent performance in the capture of a cationic organic pollutant from the aqueous phase. Kaolinite was calcined at 700 °C and treated with HCl to remove aluminium and to obtain a siliceous material. The structural changes and the physico-chemical properties of the materials at different stages of thermal and chemical modification were investigated with several techniques, including XRPD, MAS-NMR, SEM-EDX, FT-IR, and N2 physisorption at 77 K. The ability of the parent kaolinite and siliceous material to capture the organic dye, Rhodamine B, from the aqueous phase was investigated by means of UV-Vis spectroscopy. The siliceous material exhibited better adsorption capacity with respect to the parent kaolinite. Finally, the functional stability of the siliceous material was tested over three cycles of regeneration and adsorption.
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Wang YS, Luo SQ, Li XY, Li ZX, Huang PP, Zhou LL, Zhang SQ, Miao KH, Zhi WR, Deng SY, Huo TR, Zhang QY, Wang WK. Insights into the highly efficient treatment of dyeing wastewater using algal bloom derived activated carbon with wide-range adaptability to solution pH and temperature. BIORESOURCE TECHNOLOGY 2022; 349:126883. [PMID: 35192946 DOI: 10.1016/j.biortech.2022.126883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
Here, a low-cost acid-base and temperature tolerant algal bloom derived activated carbon (ABAC) was successfully prepared to remove rhodamine B (RhB) from water. The ABAC exhibited maximum adsorption capacity of RhB (1101 ± 11 mg/g), higher than that of laboratory-prepared rape straw activated carbon (176 ± 5 mg/g) and commercial activated carbon (489 ± 5 mg/g). It is attributed to larger surface area and mesoporous structure of the ABAC. Furthermore, the effective adsorption of RhB by using ABAC was achieved at a wide range of solution pH (3.2-10.8) and temperature(25-50 °C). The mass transfer resistance of RhB adsorption process well depicted by Langmuir model was controlled by external mass transfer. The adsorption process involved both secondly chemisorption (H-bonds and π-π interaction) and dominated physisorption. Four dyes in river water were efficiently removed. This work provides a promising approach for developing high-absorption biomass materials for actual dye wastewater treatment.
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Affiliation(s)
- Yan-Shan Wang
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Shu-Qi Luo
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Xiu-Yan Li
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Zhe-Xin Li
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Ping-Ping Huang
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Lu-Lu Zhou
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Si-Qiang Zhang
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Kun-Hong Miao
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Wei-Ru Zhi
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Shi-Yu Deng
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Tong-Rong Huo
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Qiu-Yu Zhang
- School of Geographic Sciences, Nantong University, Nantong 226007, China
| | - Wei-Kang Wang
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China.
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Ding F, Gao M. Pore wettability for enhanced oil recovery, contaminant adsorption and oil/water separation: A review. Adv Colloid Interface Sci 2021; 289:102377. [PMID: 33601298 DOI: 10.1016/j.cis.2021.102377] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 01/18/2023]
Abstract
Wettability, a fundamental property of porous surface, occupies a pivotal position in the fields of enhanced oil recovery, organic contaminant adsorption and oil/water separation. In this review, wettability and the related applications are systematically expounded from the perspectives of hydrophilicity, hydrophobicity and super-wettability. Four common measurement methods are generalized and categorized into contact angle method and ratio method, and influencing factors (temperature, the type and layer charge of matrix, the species and structure of modifier) as well as their corresponding altering methods (inorganic, organic and thermal modification etc.) of wettability are overviewed. Different roles of wettability alteration in enhanced oil recovery, organic contaminant adsorption as well as oil/water separation are summarized. Among these applications, firstly, the hydrophilic alteration plays a key role in recovery of the oil production process; secondly, hydrophobic circumstance of surface drives the organic pollutant adsorption more effectually; finally, super-wetting property of matrix ensures the high-efficient separation of oil from water. This review also identifies importance, challenges and future prospects of wettability alteration, and as a result, furnishes the essential guidance for selection and design inspiration of the wettability modification, and supports the further development of pore wettability application.
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Shattar SFA, Zakaria NA, Foo KY. One step acid activation of bentonite derived adsorbent for the effective remediation of the new generation of industrial pesticides. Sci Rep 2020; 10:20151. [PMID: 33214587 PMCID: PMC7677388 DOI: 10.1038/s41598-020-76723-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/28/2020] [Indexed: 11/08/2022] Open
Abstract
Herein, the facile one step acid activation of bentonite derived functionalized adsorbent (AB) for the effective remediation of both ionic and non-ionic secondary pesticides, ametryn and metolachlor has been attempted. The surface characteristics of AB were examined by the nitrogen adsorption-desorption analysis, scanning electron microscopy (SEM), and Fourier Transforms Infrared (FTIR) Spectroscopy. The adsorptive behavior was evaluated with respect to the effect of contact time, initial concentrations and solution pH. The equilibrium data were fitted to the Langmuir, Freundlich and Temkin isotherm models, while the adsorption kinetic was analyzed using the pseudo-first order and pseudo-second order kinetic equations. Thermodynamic parameters including the standard enthalpy change (ΔH°), standard entropy change (ΔS°), and Gibbs free energy change (ΔG°) were established. Thermodynamic analysis illustrated that the adsorption process was feasible and exothermic in nature, while the characterization findings verified the alteration of FTIR bands, and a high specific surface area of 464.92 m2/g, with a series of pores distributed over the surface. Equilibrium data was best confronted to the pseudo-second order kinetic model, while the adsorptive removal of ametryn and metolachlor onto AB was satisfactory described by the Langmuir isotherm model, with the monolayer adsorption capacities for ametryn and metolachlor of 2.032 and 0.208 mmole/g respectively. The findings outlined the potential of the newly develop AB for the on-site treatment of pesticide polluted water.
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Affiliation(s)
- Siti Fairos Ab Shattar
- River Engineering and Urban Drainage Research Centre (REDAC), Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300, Nibong Tebal, Penang, Malaysia
| | - Nor Azazi Zakaria
- River Engineering and Urban Drainage Research Centre (REDAC), Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300, Nibong Tebal, Penang, Malaysia
| | - Keng Yuen Foo
- River Engineering and Urban Drainage Research Centre (REDAC), Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300, Nibong Tebal, Penang, Malaysia.
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