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Wang Z, Huang K, Zheng Y, Ye H, Wang J, Tao X, Zhou J, Dang Z, Lu G. Efficient removal of heavy metals in water utilizing facile cross-link conjugated linoleic acid micelles. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:20665-20677. [PMID: 38381288 DOI: 10.1007/s11356-024-32517-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 02/14/2024] [Indexed: 02/22/2024]
Abstract
Micellar-enhanced ultrafiltration (MEUF) technology is an effective method to treat low-concentration heavy metal wastewater. However, the leakage of surfactants in the ultrafiltration (UF) process will inevitably cause secondary pollution. In this study, a biosurfactant of conjugated linoleic acid (CLA) with conjugated double bonds was selected to bind its micelles by simple thermal crosslinking to obtain morphologically stable stearic acid (SA) nanoparticles. The pure SA nanoparticles were obtained by repeated dialysis. The stability of the SA nanoparticles was verified by comparing the particle size distribution and solubility of the materials before and after crosslinking at different pH levels. The effectiveness of SA nanoparticle-enhanced UF in removing heavy metals was verified by exploring the adsorption performance of SA nanoparticles. The dialysis device was used to simplify the UF device, wherein SA nanoparticles were assessed as adsorbents for the elimination of Cu2+, Pb2+, and Cd2+ ions from aqueous solutions under diverse process parameters, including pH, contact time, metal ion concentration, and coexisting ions. The findings indicate that the SA nanoparticles have no evidence of secondary contamination in UF and exhibit compatibility with a broad pH range and coexisting ions. The maximum adsorption capacities for Cu2+, Pb2+, and Cd2+ were determined to be 152.77, 403.56, and 271.46 mg/g, respectively.
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Affiliation(s)
- Zufei Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Kaibo Huang
- School of Ecology and Environment, Hainan University, Haikou, 570228, People's Republic of China
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province (Hainan University), Haikou, 570228, China
| | - Yanjie Zheng
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Han Ye
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Juan Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Xueqin Tao
- College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Jiangmin Zhou
- College of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China
| | - Guining Lu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China.
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Chen M, Shen S, Zhang F, Zhang C, Xiong J. Biodegradable Dissolved Organic Carbon (BDOC) Removal from Micro-Polluted Water Source Using Ultrafiltration: Comparison with Conventional Processes, Operation Conditions and Membrane Fouling Control. Polymers (Basel) 2022; 14:4689. [PMID: 36365681 PMCID: PMC9658970 DOI: 10.3390/polym14214689] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/18/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
The biodegradable dissolved organic carbon (BDOC) in micro-polluted water sources affects the drinking water quality and safety in the urban water supply. The conventional technology of “coagulation-sedimentation-filtration” in a water plant located in the lower reaches of the Yangtze River removed dissolved organic carbon (DOC) with a molecular weight (MW) > 30 kDa effectively, but the BDOC elimination only ranged 27.4−58.1%, due to their predominant smaller MW (<1 kDa), leading to a high residual BDOC of 0.22−0.33 mg/L. To ensure the biological stability of drinking water, i.e., the inability to support microbial growth (BDOC < 0.2 mg/L), a pilot-scale ultrafiltration process (UF, made of aromatic polyamide with MW cut-off of 1 kDa) was operated to remove BDOC as an advanced treatment after sand-filtration. Results showed the membrane flux decreased with the increase in the influent BDOC concentration and decrease in operating pressure. With an operating pressure of 0.25 MPa, the BDOC removal by UF reached 80.7%, leading to a biologically stable BDOC concentration of 0.08 mg/L. The fouling of the membrane was mainly caused by organic pollution. The H2O2−HCl immersion washing method effectively cleaned the membrane surface fouling, with a recovery of membrane flux of 98%.
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Affiliation(s)
- Ming Chen
- School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Shuhuai Shen
- School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Fan Zhang
- Huzhou Ecological Environment Bureau, Changxing Branch, Huzhou 313100, China
| | - Cong Zhang
- School of Civil Engineering, Southeast University, Nanjing 210096, China
| | - Jianglei Xiong
- China Electronics System Engineering No.2 Construction Co., Ltd., Wuxi 214115, China
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Cao XQ, Wang X, Chen M, Xiao F, Huang YM, Lyu XJ. Synthesis of nanoscale zeolitic imidazolate framework-8 (ZIF-8) using reverse micro-emulsion for Congo red adsorption. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.118062] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Liu S, Chen M, Cao X, Li G, Zhang D, Li M, Meng N, Yin J, Yan B. Chromium (VI) removal from water using cetylpyridinium chloride (CPC)-modified montmorillonite. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116732] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Chen M, Dollar O, Shafer-Peltier K, Randtke S, Waseem S, Peltier E. Boron removal by electrocoagulation: Removal mechanism, adsorption models and factors influencing removal. WATER RESEARCH 2020; 170:115362. [PMID: 31841770 DOI: 10.1016/j.watres.2019.115362] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 11/15/2019] [Accepted: 12/01/2019] [Indexed: 06/10/2023]
Abstract
Boron (B), normally present in ground water and sea water, is a vital micronutrient for plants, but is also toxic in excessive amounts. Under typical conditions, aqueous boron is present as boric acid (H3BO3), which is uncharged, making B particularly challenging to remove by mechanisms commonly applicable to removal of trace constituents. Adsorption of B onto aluminum hydroxide solids (Al(OH)3(s)) generated using aluminum-based electrocoagulation (EC) is a promising strategy for B removal. Infrared spectroscopy analysis indicated complexation of B(OH)3 with aluminum hydroxide solids via surface hydroxyl groups, while X-ray and infrared spectroscopy results indicated that the structure of the Al(OH)3(s) was influenced both by EC operating conditions and by water quality. A linear adsorption model predicted B removal well when initial concentrations were lower than 50 mg/L, but fit the experimental data poorly at higher initial B concentrations. The Langmuir adsorption model provided a good fit for a broader range of initial B concentrations (5-1000 mg/L). Factors affecting B adsorption during the EC process, including current intensity, Al dissolution rate, boron concentration, pH, and total dissolved solid (TDS), were investigated. Increasing current intensity initially led to a higher Al dissolution rate, and therefore higher B adsorption, but there was a limit, as further increases in current intensity caused rapid formation of Al(OH)3(s) having a large particle size and a low capacity to complex B. Boron removal decreased as its concentration increased. The best removal of B occurred at pH 8, corresponding to a slightly positive zeta potential for aluminum hydroxide and a small but significant fraction of negatively charged B species. Higher TDS concentrations facilitated the use of higher current intensities, i.e., the limit on the effective Al dissolution rate increased with increasing TDS. Two real water samples (river water and oilfield produced water) spiked with B were treated using EC, resulting in up to 50% B removal from river water (C0 = 10 mg/L, current = 0.2 A) in 2 h, and 80% B removal from produced water (C0 = 50 mg/L, current = 1.0 A) in 2 h.
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Affiliation(s)
- Ming Chen
- Department of Civil, Environmental and Architectural Engineering, University of Kansas, Lawrence, KS, 66045, USA; Tertiary Oil Recovery Program, University of Kansas, Lawrence, KS, 66045, USA
| | - Orion Dollar
- Department of Civil, Environmental and Architectural Engineering, University of Kansas, Lawrence, KS, 66045, USA
| | | | - Stephen Randtke
- Department of Civil, Environmental and Architectural Engineering, University of Kansas, Lawrence, KS, 66045, USA
| | - Saad Waseem
- Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, WV, 26506, USA
| | - Edward Peltier
- Department of Civil, Environmental and Architectural Engineering, University of Kansas, Lawrence, KS, 66045, USA.
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Recent developments in functionalized polymer nanoparticles for efficient drug delivery system. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.nanoso.2019.100397] [Citation(s) in RCA: 172] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Mi B, Wang J, Xiang H, Liang F, Yang J, Feng Z, Zhang T, Hu W, Liu X, Liu Z, Fei B. Nitrogen Self-Doped Activated Carbons Derived from Bamboo Shoots as Adsorbent for Methylene Blue Adsorption. Molecules 2019; 24:E3012. [PMID: 31434214 PMCID: PMC6720587 DOI: 10.3390/molecules24163012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 08/05/2019] [Accepted: 08/09/2019] [Indexed: 11/16/2022] Open
Abstract
Bamboo shoots, a promising renewable biomass, mainly consist of carbohydrates and other nitrogen-related compounds, such as proteins, amino acids and nucleotides. In this work, nitrogen self-doped activated carbons derived from bamboo shoots were prepared via a simultaneous carbonization and activation process. The adsorption properties of the prepared samples were evaluated by removing methylene blue from waste water. The factors that affect the adsorption process were examined, including initial concentration, contact time and pH of methylene blue solution. The resulting that BSNC-800-4 performed better in methylene blue removal from waste water, due to its high specific surface area (2270.9 m2 g-1), proper pore size (2.19 nm) and relatively high nitrogen content (1.06%). Its equilibrium data were well fitted to Langmuir isotherm model with a maximum monolayer adsorption capacity of 458 mg g-1 and a removal efficiency of 91.7% at methylene blue concentration of 500 mg L-1. The pseudo-second-order kinetic model could be used to accurately estimate the carbon material's (BSNC-800-4) adsorption process. The adsorption mechanism between methylene blue solution and BSNC-800-4 was controlled by film diffusion. This study provides an alternative way to develop nitrogen self-doped activated carbons to better meet the needs of the adsorption applications.
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Affiliation(s)
- Bingbing Mi
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Jingxin Wang
- School of Natural Resources, West Virginia University, Morgantown, WV 26506, USA
| | - Hongzhong Xiang
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Fang Liang
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Jianfei Yang
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Zixing Feng
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Tao Zhang
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Wanhe Hu
- School of Natural Resources, West Virginia University, Morgantown, WV 26506, USA
| | - Xianmiao Liu
- International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Zhijia Liu
- International Centre for Bamboo and Rattan, Beijing 100102, China.
| | - Benhua Fei
- International Centre for Bamboo and Rattan, Beijing 100102, China.
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