1
|
Gabriel R, dos Santos Lins PV, Vilela FDAM, de Carvalho SHV, Brandão RJ, Soletti JI, Meili L. Synthesis of layered double hydroxides: Investigating the impact of stirring conditions and reactor design parameters. Heliyon 2024; 10:e30116. [PMID: 38699740 PMCID: PMC11063454 DOI: 10.1016/j.heliyon.2024.e30116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 03/26/2024] [Accepted: 04/19/2024] [Indexed: 05/05/2024] Open
Abstract
The synthesis by coprecipitation of Layered Double Hydroxides (LDHs) is governed by the stages of nucleation and crystal growth associated with the efficiency of the mixing and dispersion process of the reagents. Mixing efficiency is related to process variables, such as agitation speed, type of impeller and baffles presence, among others. In this context, this work proposes an analysis of these variables in a batch reactor, using a 23 factorial design employing the factors: acceleration speed (200 and 1000 rpm), mixing time (2 and 18 h) and presence or absence of baffles. The results were evaluated quantitatively (amount of LDH produced, time and amount of base for the formation of LDHs to begin) and qualitatively (mixing aspects, sedimentation ad grinding). The significant factors affecting the amount of LDH produced (51.94-80.81 g) were agitation speed and aging time. These factors were also correlated with the structural characteristics of the materials produced, such as crystallinity, crystallite size (70.99-174.79 nm), surface area (69.81-97.62 m2/g), pore volume (0.28-0.59 cm3/g), and pore diameter (11.40-34.66 nm). LDHs produced at higher agitation rates (1000 rpm) and longer aging times (18 h) yielded higher quantities of materials (80.81 g) with improved structural characteristics. The study highlights the importance of systematically exploring the synergistic effect between process variables, emphasizing the research potential in this area.
Collapse
Affiliation(s)
- Rafaela Gabriel
- Laboratory of Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| | | | | | - Sandra Helena Vieira de Carvalho
- Laboratory of Separation Systems and Optimization Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| | | | - João Inácio Soletti
- Laboratory of Separation Systems and Optimization Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| | - Lucas Meili
- Laboratory of Processes, Center of Technology, Federal University of Alagoas, Maceió, Alagoas, 57072-900, Brazil
| |
Collapse
|
2
|
Nie Y, Zhang T, Xu Y, Du Y, Ai J, Xue N. Study on mechanism of removal of sudden Tetracycline by compound modified biological sand filtration process. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 356:120709. [PMID: 38537460 DOI: 10.1016/j.jenvman.2024.120709] [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: 09/12/2023] [Revised: 03/05/2024] [Accepted: 03/19/2024] [Indexed: 04/07/2024]
Abstract
The removal of tetracycline from the sewage plant effluents through advanced treatment methods is key to controlling tetracycline levels in the water environment. In this study, modified quartz sands (QS) were used in a biological sand filter to remove tetracycline. The modified QS, with different surface characteristics, were prepared using glass etching technology combined with subsequent chemical modification methods, including hydroxylation treatment, metal ion modification, and amino modification. The adsorption efficiency of hydroxylated QS was higher than that of metal ion modified and amino modified QS, with adsorption efficiencies of 20.4331 mg/kg, 12.8736 mg/kg, and 10.1737 mg/kg, respectively. Results indicated that QS primarily reduce tetracycline through adsorption. Adsorption on ordinary QS fit the pseudo-first-order kinetic model, while adsorption on other modified QS and biofilm-coated QS fit the pseudo-second-order kinetics model. Biodegradation was identified as another mechanism for tetracycline reduction, which fit the zero-order kinetic model. Pseudomonas alcaligenes and unclassified Pseudomonas accounted for 96.6% of the total tetracycline-degrading bacteria. This study elucidates the effectiveness and mechanisms of five types of QS in treating tetracycline from sewage plant effluents. It provides a novel method for tetracycline reduction in real-world wastewater scenarios.
Collapse
Affiliation(s)
- Yudong Nie
- Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China; College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
| | - Tao Zhang
- Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China.
| | - Yufeng Xu
- Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China; Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China.
| | - Yunfei Du
- School of Foreign Languages, Chongqing University of Technology, Chongqing 400054, China.
| | - Junjie Ai
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
| | - Na Xue
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
| |
Collapse
|
3
|
Eizi R, Bastami TR, Mahmoudi V, Ayati A, Babaei H. Facile ultrasound-assisted synthesis of CuFe-Layered double hydroxides/g-C3N4 nanocomposite for alizarin red S sono-sorption. J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2023.104844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
|
4
|
Jiang Z, Zheng Z, Wu J, Liu X, Yu H, Shen J. Synthesis, characterization and performance of microorganism-embedded biocomposites of LDH-modified PVA/SA hydrogel beads for enhanced biological nitrogen removal process. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.07.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
5
|
Dang VM, Nguyen VD, Van HT, Nguyen VQ, Nguyen TN, Nghiem LD. Removal of Cr(VI) and Pb(II) from aqueous solution using Mg/Al layered double hydroxides-mordenite composite. SEP SCI TECHNOL 2022. [DOI: 10.1080/01496395.2022.2070500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Van Minh Dang
- Thai Nguyen University, Tan Thinh Ward, Thái Nguyên, Vietnam
| | - Vinh Dinh Nguyen
- Faculty of Chemistry, TNU - University of Sciences, Thai Nguyen, Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment, TNU - University of Sciences, Thai Nguyen, Vietnam
| | - Van Quang Nguyen
- Faculty of Chemistry, Hanoi Pedagogical University 2, Phuc Yen, Vietnam
| | - Trong Nghia Nguyen
- Faculty of Chemical and Environmental Technology, University of Technical Education in Hung Yen, Hung Yen, Vietnam
| | - Long D. Nghiem
- Centre for Technology in Water and Wastewater, University of Technology Sydney, Ultimo, Australia
| |
Collapse
|
6
|
Zhang H, Li J, Shu S, Guo J, Liu Y, Cen W, Li X, Yang J. Preparation of VOC low-temperature oxidation catalysts with copper and iron binary metal oxides via hydrotalcite-like precursors. RSC Adv 2022; 12:35083-35093. [DOI: 10.1039/d2ra06611d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 11/17/2022] [Indexed: 12/13/2022] Open
Abstract
Design diagram for the removal toluene by Cu–Fe catalyst prepared from precursor hydrotalcite.
Collapse
Affiliation(s)
- Hongwei Zhang
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Jianjun Li
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Song Shu
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Jiaxiu Guo
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Yongjun Liu
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Wanglai Cen
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, China
| | - Xinpeng Li
- Chongqing Iron & Steel Company Limited, Chongqing 401220, China
| | - Jianrong Yang
- Chongqing Iron & Steel Company Limited, Chongqing 401220, China
| |
Collapse
|
7
|
Wang L, Zhu Z, Wang F, Qi Y, Zhang W, Wang C. State-of-the-art and prospects of Zn-containing layered double hydroxides (Zn-LDH)-based materials for photocatalytic water remediation. CHEMOSPHERE 2021; 278:130367. [PMID: 33813335 DOI: 10.1016/j.chemosphere.2021.130367] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 02/27/2021] [Accepted: 03/20/2021] [Indexed: 06/12/2023]
Abstract
With the rapid worldwide development of industry and human activities, increasing amounts of multifarious contaminants have significantly threatened environmental ecosystems and human health. Solar photocatalytic decontamination, as an environmentally friendly technology, has been regarded as a good approach to eliminate water pollutants. To date, various photocatalysts have been developed for the purpose of water remediation. Zn-containing layered double hydroxides (Zn-LDHs) and their derivatives are promising candidates due to their suitable band edge positions (oxidation-reduction potentials) for high photocatalytic performances, flexible properties derived from adjustable components and tailorable electronic structures, chemical stabilities, and low toxicities. This review focuses on the fabrication and modification of Zn-LDHs and their photocatalytic applications for the elimination of contaminants in water, including the degradation of toxic organic pollutants, transfer of hazardous heavy metals to lower toxicity heavy metals, and bacterial inactivation. The mechanisms involved in the photocatalytic processes are also thoroughly reviewed. Finally, the emerging scientific and engineering opportunities and challenges in environmental photocatalysis are presented. This review provides basic insights into the construction of Zn-LDH-based materials with high photocatalytic activities and new perspectives on their applications for the photocatalytic elimination of contaminants, which is helpful for the development of photocatalysis for environmental remediation from the lab to industry.
Collapse
Affiliation(s)
- Lan Wang
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, China; Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi, 830011, China.
| | - Zhiqiang Zhu
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, China
| | - Fu Wang
- Shanghai Med-X Engineering Research Center, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Yihao Qi
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, China
| | - Wei Zhang
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, China
| | - Chuanyi Wang
- School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian, 710021, China
| |
Collapse
|
8
|
Cheng J, Zhang X, Tang Y, Song Z, Jiang Y, Xu Z, Jin X. Nitrogen removal from domestic wastewater using core-shell anthracite/Mg-layered double hydroxides (LDHs) in constructed wetlands. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:38349-38360. [PMID: 33733402 DOI: 10.1007/s11356-021-13422-7] [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: 12/22/2020] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
To investigate the mechanism of nitrogen removal by anthracites and enhance the nitrogen removal efficiency in constructed wetland, three kinds of layered double hydroxides (MgFe-LDHs, MgCo-LDHs, MgAl-LDHs) were prepared by co-precipitation under alkaline conditions and coated in situ on the surface of anthracites to synthesize core-shell anthracites/Mg-LDHs composites. Experiments with different treatments (columns loaded with original anthracites and anthracite/Mg-LDH composites) were conducted to study the nitrogen removal efficiency of domestic wastewater in constructed wetlands. The results of nitrogen removal experiments showed that the anthracite/MgAl-LDH composite had the best performance with average removal rates of 53.69%, 72.91%, and 47.43% for TN, NH4+-N, and organic nitrogen, respectively. Modification changed the denitrification mode of the anthracites. The data of adsorption isothermal experiments were fitted better with the Freundlich model. The amount of ammonifier, nitrosobacteria, nitrobacter, and denitrifier on the surface of the Mg-LDH-modified anthracite was higher than that of the original anthracite. The performance of the anthracite in removing nitrogen was attributed to physical interception, chemical adsorption, and biological degradation. Moreover, the modified anthracites were superior to the original anthracite in the chemical adsorption and biodegradation, which indicated that coating the Mg-LDHs on the surface of common anthracite was a potential method to improve the nitrogen removal efficiency of domestic wastewater and to restore the eutrophic water body.
Collapse
Affiliation(s)
- Jing Cheng
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China
| | - Xiangling Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China.
| | - Yuqi Tang
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China
| | - Zan Song
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China
| | - Yinghe Jiang
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China
| | - Zhouying Xu
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China
| | - Xi Jin
- School of Civil Engineering and Architecture, Wuhan University of Technology, 122, Luoshi Road, Hongshan District, Wuhan, 430070, China
| |
Collapse
|
9
|
Dang VM, Van HT, Vinh ND, Hoa Duong TM, Hanh Nguyen TB, Nguyen TT, Ha Tran TN, Hoang TK, Tran TP, Nguyen LH, Chu MN. Enhancement of exchangeable Cd and Pb immobilization in contaminated soil using Mg/Al LDH-zeolite as an effective adsorbent. RSC Adv 2021; 11:17007-17019. [PMID: 35479705 PMCID: PMC9031545 DOI: 10.1039/d0ra10530a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 05/05/2021] [Indexed: 11/21/2022] Open
Abstract
In the present study, experiments using zeolite and Mg/Al LDH-zeolite for immobilization of Cd and Pb ions in artificial soil were conducted. The conditions which affect Cd and Pb ion immobilization in soil were evaluated, namely soil pH (5-7), the mass ratio of adsorbents (1%, 3% and 5%), incubation time (15 days, 30 days and 45 days) and soil moisture (30%, 50% and 70%). The results indicated that the optimal soil pH, mass ratio of adsorbents, incubation time and soil moisture for immobilization of Cd and Pb ions by the adsorbent were, respectively, 7.0, 3%, 30 days and 70%. The exchangeable Cd ion content in the contaminated soil dropped from 22.17 mg kg-1 (87.65%) to 11.03 mg kg-1 (43.48%) and 6.47 mg kg-1 (26.36%) on incubation with zeolite and Mg/Al LDH-zeolite, respectively, while the exchangeable Pb content fell from 23.28 mg kg-1 (90.02%) to 14.12 mg kg-1 (54.04%) and 9.47 mg kg-1 (35.24%) using zeolite and Mg/Al LDH-zeolite as absorbents in contaminated soil, respectively. Fe-Mn oxide occluded (F2), carbonate bound (F3) and organically complexed (F4) were the main forms for immobilization of the exchangeable Cd and Pb when the zeolite and Mg/Al LDH-zeolite absorbents were separately cultivated into soil. Precipitation, co-precipitation and electrostatic attraction were the main mechanisms of exchangeable Cd and Pb immobilization onto the Mg/Al LDH-zeolite to form carbonate metals (CdCO3 and PbCO3). This was due to the surface functional groups of the adsorbent and the presence of Fe and Al oxyhydroxides, Mn oxides, and Si and O elements in the Mg/Al LDH-zeolite's constituents. The efficiency of Cd and Pb immobilization by the Mg/Al LDH-zeolite was higher than that by zeolite from 1.5 to 1.6 times. The Mg/Al LDH-zeolite showed an enhanced ability of exchangeable Cd and Pb immobilization in contaminated soil.
Collapse
Affiliation(s)
- Van Minh Dang
- Thai Nguyen University Tan Thinh ward Thai Nguyen city Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - N D Vinh
- Faculty of Chemistry, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thi Minh Hoa Duong
- Faculty of Environment, TNU - University of Agriculture and Forestry Quyet Thang ward Thai Nguyen city Vietnam
| | - Thi Bich Hanh Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thị Tuyet Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thi Ngoc Ha Tran
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Trung Kien Hoang
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thị Pha Tran
- Faculty of Environment, TNU - University of Agriculture and Forestry Quyet Thang ward Thai Nguyen city Vietnam
| | - Lan Huong Nguyen
- Faculty of Environment - Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam
| | - Manh Nhuong Chu
- Faculty of chemistry, TNU - University of Education No. 20, Luong Ngoc Quyen Road Thai Nguyen City Vietnam
| |
Collapse
|
10
|
Shen S, Li X, Cheng F, Zha X, Lu X. Review: recent developments of substrates for nitrogen and phosphorus removal in CWs treating municipal wastewater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:29837-29855. [PMID: 32472508 DOI: 10.1007/s11356-020-08808-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 04/07/2020] [Indexed: 06/11/2023]
Abstract
Substrates are the main factor influencing the performance of constructed wetlands (CWs), and especially play an important role in enhancing the removal of nitrogen and phosphorus from CWs. In the recent 10 years, based on the investigation of emerged substrates used in CWs, this paper summarizes the removal efficiency and mechanism of nitrogen and phosphorus by a single substrate in detail. The simultaneous removal efficiency of nitrogen and phosphorus by different combined substrates is emphatically analyzed. Among them, the reuse of industrial and agricultural wastes as water treatment substrates is recommended due to the efficient pollutant removal efficiency and the principle of waste minimization, also more studies on the environmental impact and risk assessment of the application, and the subsequent disposal of saturated substrates are needed. This work serves as a basis for future screening and development of substrates utilized in CWs, which is helpful to enhance the synchronous removal of nitrogen and phosphorus, as well as improve the sustainability of substrates and CWs. Moreover, further studies on the interaction between different types of substrates in the wetland system are desperately needed.
Collapse
Affiliation(s)
- Shuting Shen
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Xiang Li
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Fangkui Cheng
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Xiao Zha
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China
| | - Xiwu Lu
- School of Energy & Environment, Southeast University, 2 Sipailou Rd, Nanjing, 210096, Jiangsu, People's Republic of China.
- ERC Taihu Lake Water Environment Wuxi, 99 Linghu Rd, Wuxi, 214135, People's Republic of China.
| |
Collapse
|
11
|
Ji Y, Zhang X, Gao J, Zhao S, Dou Y, Xue Y, Chen L. Efficiency and mechanisms of cadmium removal via core-shell zeolite/Zn-layer double hydroxides. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109887. [PMID: 31706237 DOI: 10.1016/j.ecoenv.2019.109887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 10/25/2019] [Accepted: 10/26/2019] [Indexed: 06/10/2023]
Abstract
To investigate the removal mechanisms of cadmium (Cd) by Zn-layer double hydroxides-modified zeolites substrates in constructed rapid infiltration systems (CRIS), the ZnAl-LDHs and ZnFe-LDHs were synthesized and in-situ coated on the original zeolites through co-precipitation method. The prepared Zn-LDHs-modified and original zeolites were characterized by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) methods, whose results provided the evidences that the Zn-LDHs were successfully coated on the original zeolites. From the results of purification experiments, the average Cd removal rates of ZnAl-LDHs-modified, ZnFe-LDHs-modified and original zeolites were 88.40, 86.00 and 32.52%, respectively; demonstrating that the removal rates of zeolites could significantly improve. Additionally, the modification of Zn-LDHS could enhance the theoretical adsorption ability. According to the results of isothermal adsorption and desorption tests, the desorption rates of Zn-LDHs-modified zeolites were higher than that of original zeolites. Cd adsorption capacity of ZnFe-LDHs-modified zeolites was 1428.57 mg kg-1 and original zeolites was 434.783 mg kg-1. In the adsorption kinetic studies, the pseudo-second-order models were used to well describe the experimental results of Zn-LDHs-modified zeolites, indicating that their adsorption types were attributed to be more stable chemisorption. Besides, the relevant microbial tests also confirmed that microbial enzymatic activity and extracellular polymeric substances (EPS) were significantly promoted on surface of Zn-LDHs-modified zeolites. The contents of EPS on the surface of zeolites were as following: ZnAl-LDHs-modified zeolites (78.58128 μg/g) > ZnFe-LDHs-modified zeolites (71.85445 μg/g) > original zeolites (68.69904 μg/g). Meanwhile, the results of high-throughput sequencing showed that modification by Zn-LDHs improved microbial diversity and relative abundance. The Proteobacteria was the dominant phylum and the Acidobacteria was conducive to Cd removal. Overall, it could be concluded that ZnAl-LDHs-modified zeolites might be applied as an efficient substrate for Cd removal in CRIS.
Collapse
Affiliation(s)
- Yunsen Ji
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Xiangling Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China.
| | - Jingtian Gao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Shuangjie Zhao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Yankai Dou
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Yu Xue
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Lihong Chen
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| |
Collapse
|
12
|
Zhang X, Dou Y, Gao C, He C, Gao J, Zhao S, Deng L. Removal of Cd(II) by modified maifanite coated with Mg-layered double hydroxides in constructed rapid infiltration systems. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:951-962. [PMID: 31247441 DOI: 10.1016/j.scitotenv.2019.06.228] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 06/13/2019] [Accepted: 06/15/2019] [Indexed: 06/09/2023]
Abstract
To improve the adsorption performance of Cd(II) by maifanite in constructed rapid infiltration systems (CRIS), Mg-layered double hydroxides (MgAl-LDHs, MgFe-LDHs) are prepared by a co-precipitation method and in-situ coated on the surface of original maifanite. Characterization of the successful LDHs-coating modification is realized by the following: scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Brunauer Emmett Teller (BET). In the purification experiments, the average removal rates of Cd(II) were 97.66% for maifanite/MgAl-LDHs and 97.54% for maifanite/MgFe-LDHs, approximately 11% greater than for the original maifanite. Isothermal adsorption experiments and adsorption kinetic experiments were conducted to explore the Cd(II) adsorption mechanism. The modified maifanite demonstrated a higher Langmuir adsorption capacity and stronger surface bond energies compared to the original maifanite. The adsorption type of Cd(II) by maifanite/Mg-LDHs and original maifanite was monolayer adsorption based mainly on chemical adsorption. Furthermore, the extracellular polymeric substances and dehydrogenase activities of the microorganisms were measured and analyzed to study the effect of microorganisms on the removal of Cd(II) in the test columns. High-throughput sequencing technology was also applied to analyze the composition and diversity of bacterial communities. Based on a simple estimation, the synthesis cost of maifanite/MgAl-LDHs was only ¥ 0.33/Kg. In brief, maifanite/Mg-LDHs is an efficient and economical substrate for a CRIS for Cd(II) removal.
Collapse
Affiliation(s)
- Xiangling Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China.
| | - Yankai Dou
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Chenguang Gao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Chunyan He
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Jingtian Gao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Shuangjie Zhao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Lichu Deng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| |
Collapse
|
13
|
Zhang X, Zhao S, Gao J, Lei Y, Yuan Y, Jiang Y, Xu Z, He C. Microbial action and mechanisms for Cr(VI) removal performance by layered double hydroxide modified zeolite and quartz sand in constructed wetlands. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 246:636-646. [PMID: 31212217 DOI: 10.1016/j.jenvman.2019.06.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 05/30/2019] [Accepted: 06/05/2019] [Indexed: 06/09/2023]
Abstract
This study was conducted to evaluate the performance underlying the removal of hexavalent chromium Cr(VI) associated with Zn-layered double hydroxides (Zn-LDHs)-modified substrates utilized in simulated constructed wetlands (CWs) from a microbial perspective. To accomplish this, Zn-LDHs-modified substrates (zeolite and quartz sand (QS)) were synthesized at various Zn2+/Al3+ and Fe3+ molar ratios by co-precipitation under alkaline conditions. The experimental group was then compared with a control group to determine the microbial action responsible for Cr(VI) removal during the Cr(VI) removal experiments. The removal experiment revealed that the average Cr(VI) removal rates of the Zn-LDHs-modified substrates were superior to those of natural substrates. Subsequent evaluation of the microbial structure by Illumina high-throughput sequencing revealed that the relative abundance of Novosphingobium, Brevundimonas, Methylophilus, and Acidovorax related to Cr(VI) removal was relatively high in Zn-LDHs-modified substrates. Moreover, the extracellular polymeric substance (EPS) content was significantly influenced by the Zn-LDHs coating according to the relative microbial experiments. Similar trends were observed in enzyme activity. Taken together, these findings illustrated that the Zn-LDHs coating had a significant impact on microbial action, and the Cr(VI) removal efficiency of the Zn-LDHs-modified QS (zeolite) substrate was better than that of the natural substrate because of intracellular and extracellular removal mechanisms. Briefly, the microbial action of Zn-LDHs-modified QS played an important role in Cr(VI) removal, since the EPS content possessed the appropriate concentrations. Moreover, the microbial activity of ZnAl-LDHs-modified QS (zeolite) may have been higher than that of ZnFe-LDHs-modified QS (zeolite) because Al had a stronger promoting effect on Cr(VI) bio-removal than Fe. Therefore, the microbial Cr(VI) removal supported by ZnAl-LDHs-modified QS is a better choice for CWs.
Collapse
Affiliation(s)
- Xiangling Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China.
| | - Shuangjie Zhao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Jingtian Gao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China; School of Energy and Environment, Inner Mongolia University of Science & Technology, Baotou, 014010, China
| | - Yu Lei
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Ye Yuan
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Yinghe Jiang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Zhouying Xu
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Chunyan He
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| |
Collapse
|
14
|
Gao C, Zhang X, Yuan Y, Lei Y, Gao J, Zhao S, He C, Deng L. Removal of hexavalent chromium ions by core-shell sand/Mg-layer double hydroxides (LDHs) in constructed rapid infiltration system. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 166:285-293. [PMID: 30273852 DOI: 10.1016/j.ecoenv.2018.09.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 08/24/2018] [Accepted: 09/20/2018] [Indexed: 06/08/2023]
Abstract
This study aimed to determine the efficiencies and mechanisms of hexavalent chromium (Cr(VI)) removal with modified sand coated by Mg-LDHs in constructed rapid infiltration system (CRIS). Mg-LDHs (MgAl-LDHs, MgFe-LDHs) were prepared by co-precipitation method and in situ coated onto the surface of original sand. Scanning Electron Microscope (SEM) and X-Ray Fluorescence Spectrometer (XRFS) were used to analyze physicochemical properties of sand/Mg-LDHs composites. Results obtained confirmed the successful LDHs-coating modification. During the purification experiments, the average removal rates of Cr(VI) were 47.62% for sand/MgAl-LDHs, 34.15% for sand/MgFe-LDHs and 11.61% for original sand, respectively. The sand/Mg-LDHs had a higher Langmuir adsorption capacity and desorption capability for Cr(VI) compared to original sand. The adsorption kinetic data of different adsorbents were better described by pseudo-second-order model. Intra-particle diffusion model was also used to elucidate the adsorption mechanism. Moreover, extracellular polymeric substances, biomass and enzymatic activity of microbes on the modified and original sand were testified and analyzed to study microbial effect on Cr(VI) removal in test columns. Through a rough economic estimation, the reagent cost of sand/MgAl-LDHs synthesis was only RMB ¥ 0.24/Kg. It could be concluded that MgAl-LDHs modified sand is an efficient and economical substrate of CRIS for Cr(VI) removal.
Collapse
Affiliation(s)
- Chenguang Gao
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| | - Xiangling Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, China.
| | - Ye Yuan
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| | - Yu Lei
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| | - Jingtian Gao
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| | - Shuangjie Zhao
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| | - Chunyan He
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| | - Lichu Deng
- School of Civil Engineering and Architecture, Wuhan University of Technology, China
| |
Collapse
|