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Cao Y, Dai Z, Zhou X, Lin Y, Hou J. Fabrication of an Fe-Doped ZIF-67 Derived Magnetic Fe/Co/C Composite for Effective Removal of Congo Red. Molecules 2024; 29:2078. [PMID: 38731571 PMCID: PMC11085441 DOI: 10.3390/molecules29092078] [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: 03/13/2024] [Revised: 04/24/2024] [Accepted: 04/28/2024] [Indexed: 05/13/2024] Open
Abstract
The dyes in printing and dyeing wastewater are harmful to the human body and the environment. It is essential to develop practical and effective adsorbents to deal with them. In this study, an Fe-doped, ZIF-67 derived Fe/Co/C composite material with strong magnetism was successfully synthesized. The effects of pH, initial concentration, and adsorption time on the properties of the adsorbent were investigated. To further improve the removal efficiency and enhance the practicality, potassium peroxymonosulfate (PMS) was added to the system due to its Fenton-like effect. Then, an Fe/Co/C composite was used with PMS to remove Congo red (CR) with a 98% removal of 250 mg·L-1. Moreover, for its high saturation magnetization of 85.4 emu·g-1, the Fe/Co/C composite can be easily recovered by applying a magnetic field, solving the problem that powdery functional materials are difficult to recover and, thus, avoiding secondary pollution. Furthermore, since the composite material was doped before carbonization, this synthetic strategy is flexible and the required metal elements can be added at will to achieve different purposes. This study demonstrates that this Fe-doped, ZIF-67 derived magnetic material has potential application prospects for dye adsorption.
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Affiliation(s)
- Yu Cao
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, China; (Z.D.); (X.Z.); (Y.L.)
| | - Zeming Dai
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, China; (Z.D.); (X.Z.); (Y.L.)
| | - Xuan Zhou
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, China; (Z.D.); (X.Z.); (Y.L.)
| | - Yuting Lin
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, China; (Z.D.); (X.Z.); (Y.L.)
| | - Jianhua Hou
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, China; (Z.D.); (X.Z.); (Y.L.)
- Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
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2
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Zhao Q, Xie L, Cao P, Zhang Z, Li K, Lin H, Huang C. A Study on the Borehole Wall Stability Analysis and Slurry Ratio Optimization for Construction of Pile in Complex Marine Strata. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1984. [PMID: 38730791 PMCID: PMC11084209 DOI: 10.3390/ma17091984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/17/2024] [Accepted: 04/22/2024] [Indexed: 05/13/2024]
Abstract
In order to address the issue of hole collapse, which frequently arises when boring piles are being constructed in intricate marine strata, this paper discusses the influence of the slurry ratio on the slurry performance as well as the mechanism of slurry wall protection. It performs this by means of theoretical analysis, laboratory ratio testing, engineering analogies, numerical simulation, and field testing. Our findings demonstrate that adding sodium polyacrylate and sodium carboxymethyl cellulose can enhance mud's viscosity, contribute to flocculation, and improve the connection between mud and soil layers. Refering similar engineering cases, three optimization schemes are proposed for achieving a mud ratio that offers wall protection in complex marine strata. Furthermore, the particle flow model of slurry viscous fluid is established. The collapse of holes in the sand layer is reflected in the uneven radial displacement of hole walls and the invasion of mud particles. Increasing the viscosity of mud gradually transforms the uneven radial deformation of pore walls in the sand layer into a uniform radial deformation, whereas increasing the proportion of mud significantly decreases the radial displacement of hole walls. Additionally, when the mud pressure in the hole is 300 kPa and 600 kPa, the wall protection effect is better, and there is no particle penetration by substances such as sand. It is found that a high mud pressure can promote the diffusion of mud particles into the sand layer, while low mud pressure cannot balance the pressure on deep soil. The results of the field tests show that the ratio of water-clay-bentonite-CMC-Na-sodium carbonate = 700:110:90:1.5:0.5 used (where the mass percentage of each material is 77.8% water, 12.2% clay, 10% bentonite, 0.16% CMC-Na, and 0.05% sodium carbonate) can effectively prevent hole collapse and reduce the thickness of the sand layer at the bottom of the hole by 50%.
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Affiliation(s)
- Qingxiong Zhao
- School of Resources and Safety Engineering, Central South University, Changsha 410083, China; (Q.Z.); (P.C.); (Z.Z.); (K.L.)
| | - Linglin Xie
- Key Laboratory of Natural Resources Monitoring and Supervision in Southern Hilly Region, Ministry of Natural Resources, Changsha 430071, China
- The Second Surveying and Mapping Institude of Hunan Province, Changsha 430071, China
| | - Ping Cao
- School of Resources and Safety Engineering, Central South University, Changsha 410083, China; (Q.Z.); (P.C.); (Z.Z.); (K.L.)
| | - Ziyang Zhang
- School of Resources and Safety Engineering, Central South University, Changsha 410083, China; (Q.Z.); (P.C.); (Z.Z.); (K.L.)
| | - Kaihui Li
- School of Resources and Safety Engineering, Central South University, Changsha 410083, China; (Q.Z.); (P.C.); (Z.Z.); (K.L.)
| | - Hang Lin
- School of Resources and Safety Engineering, Central South University, Changsha 410083, China; (Q.Z.); (P.C.); (Z.Z.); (K.L.)
| | - Chao Huang
- Sinohydro Engineering Bureau 8 Co., Ltd., Changsha 410004, China;
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3
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Zha S, Liu H, Li H, Li H, Wong KL, All AH. Functionalized Nanomaterials Capable of Crossing the Blood-Brain Barrier. ACS NANO 2024; 18:1820-1845. [PMID: 38193927 PMCID: PMC10811692 DOI: 10.1021/acsnano.3c10674] [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: 10/30/2023] [Revised: 12/20/2023] [Accepted: 12/22/2023] [Indexed: 01/10/2024]
Abstract
The blood-brain barrier (BBB) is a specialized semipermeable structure that highly regulates exchanges between the central nervous system parenchyma and blood vessels. Thus, the BBB also prevents the passage of various forms of therapeutic agents, nanocarriers, and their cargos. Recently, many multidisciplinary studies focus on developing cargo-loaded nanoparticles (NPs) to overcome these challenges, which are emerging as safe and effective vehicles in neurotheranostics. In this Review, first we introduce the anatomical structure and physiological functions of the BBB. Second, we present the endogenous and exogenous transport mechanisms by which NPs cross the BBB. We report various forms of nanomaterials, carriers, and their cargos, with their detailed BBB uptake and permeability characteristics. Third, we describe the effect of regulating the size, shape, charge, and surface ligands of NPs that affect their BBB permeability, which can be exploited to enhance and promote neurotheranostics. We classify typical functionalized nanomaterials developed for BBB crossing. Fourth, we provide a comprehensive review of the recent progress in developing functional polymeric nanomaterials for applications in multimodal bioimaging, therapeutics, and drug delivery. Finally, we conclude by discussing existing challenges, directions, and future perspectives in employing functionalized nanomaterials for BBB crossing.
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Affiliation(s)
- Shuai Zha
- Hubei
University of Chinese Medicine, School of
Laboratory Medicine, 16
Huangjia Lake West Road, Wuhan 430065, China
- Hubei
Shizhen Laboratory, Wuhan 430061, China
| | - Haitao Liu
- Hong
Kong Baptist University, Department of Chemistry, Ho Sin Hang Campus, 224 Waterloo
Road, Kowloon, Hong Kong SAR 999077, China
| | - Hengde Li
- Hong
Kong Baptist University, Department of Chemistry, Ho Sin Hang Campus, 224 Waterloo
Road, Kowloon, Hong Kong SAR 999077, China
| | - Haolan Li
- Dalian
University of Technology School of Chemical
Engineering, Lingshui
Street, Ganjingzi District, Dalian 116024, China
| | - Ka-Leung Wong
- The
Hong Kong Polytechnic University Department of Applied Biology and Chemical Technology, Building Y815, 11 Yuk Choi Road, Hung Hom, Kowloon, Hong Kong SAR 999077, China
| | - Angelo Homayoun All
- Hong
Kong Baptist University, Department of Chemistry, Ho Sin Hang Campus, 224 Waterloo
Road, Kowloon, Hong Kong SAR 999077, China
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Zhang M, Zhang Y, Chen X, Sun J, Lu X, He Y, Wang Y. Characteristics and mechanism of phosphate removal by lanthanum modified bentonite in the presence of dissolved organic matter. CHEMOSPHERE 2023; 340:139957. [PMID: 37633606 DOI: 10.1016/j.chemosphere.2023.139957] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 08/11/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
Lanthanum modified bentonite (LMB) is a widely used adsorbent for removing inorganic phosphorus from polluted water to prevent eutrophication. However, its efficiency can be affected by various environmental factors, including dissolved organic matter (DOM), which is still unclear. In this study, we systematically explored the influence of model DOMs, including HA, bovine serum albumin (BSA), and sodium alginate (SA), on phosphate adsorption by LMB, as well as to elucidate the underlying adsorption mechanisms. Our results showed that only HA had a significant effect on phosphate adsorption by LMB, causing inhibition. When three DOMs were mixed with phosphate in different proportions and DOM was mainly HA, the performance of phosphate adsorption on LMB became worse, while BSA can slightly offset this impact. The kinetics of HA and phosphate adsorption on LMB followed the pseudo-second-order kinetic model, and isotherms fitted the Langmuir model, with a maximum adsorption capacity of 5.7 mg g-1 for P and 12 mg g-1 for HA. However, when HA and phosphate were mixed based on their Qm, a C/P molar ratio of 5.35, LMB preferentially adsorbed phosphate. HA invasion was also disadvantageous for phosphate removal by LMB, in which P adsorption was less efficient at low-concentrations. However, during co-adsorption the adsorption capacity for HA was higher. With a secondary addition of higher levels of P, both pollutants were adsorbed more effectively. In the natural water experiment, phosphate concentration decreased with increasing shaking time, while the UV254 value showed a downward trend, indicating that LMB also adsorbed HA. Characterization results showed that La and phosphate formed LaPO4 precipitation, forming La-O-P inner-sphere complexes as the main mechanism of phosphate removal by LMB. La and HA formed La-HA complexes, with O-CO bonds from HA competing for lanthanum with phosphate. Despite HA obstructing pores from adsorbent, LMB still maintained a good binding ability with phosphate. It may form La-P-HA ternary complexes during adsorption to keep HA adsorption amount.
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Affiliation(s)
- Mingxin Zhang
- School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yaping Zhang
- School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
| | - Xi Chen
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China; South China Institute of Environmental Science, The Ministry of Ecology and Environment of PR China, Guangzhou, 510655, China.
| | - Jian Sun
- School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Xingwen Lu
- School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yao He
- School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yujie Wang
- School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
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5
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Goli T, Jathan Y, Yang Y, Pagilla KR, Marchand EA. Pilot-scale demonstration of dissolved organic nitrogen removal from an advanced water reclamation facility using enhanced coagulation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 877:162864. [PMID: 36931510 DOI: 10.1016/j.scitotenv.2023.162864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/08/2023] [Accepted: 03/10/2023] [Indexed: 05/06/2023]
Abstract
Most wastewater treatment facilities that satisfy stricter discharge restrictions for nutrients, remove dissolved inorganic nitrogen (DIN) species efficiently, leaving dissolved organic nitrogen (DON) to be present at a higher proportion (up to 85 %) of total nitrogen (TN) in the effluent. Discharged DON promotes algae growth in receiving water bodies and is a growing concern in effluent potable reuse applications considering its potential to form hazardous nitrogenous disinfection byproducts (N-DBPs). Enhanced coagulation is an established process in the advanced water treatment train for most potable reuse applications. However, so far, no information has been collected at the pilot scale to address DON removal efficiency and process implications by enhanced coagulation under real conditions. This study performed a comprehensive evaluation of DON removal from the effluent of the Truckee Meadows Water Reclamation Facility (TMWRF) by enhanced coagulation over the course of 11 months at the pilot scale. Three different coagulants (aluminum sulfate (alum), poly‑aluminum chloride (PACl), ferric chloride (FC)) and a cationic polymer coagulant aid (Clarifloc) were used. Optimum doses for each coagulant and polymer and ideal pH were determined by jar tests and applied at the pilot. Alum (24 mg/L) resulted in highly variable DON removal (6 % - 40 %, 21 % on average), which was enhanced by the addition of polymer, leading to 32 % DON removal on average. PACl (40 mg/L) and FC (100 mg/L) resulted in more consistent DON removal (on average 45 % and 57 %, respectively); however, polymer addition exerted minimal enhancement for these coagulants. Overall, enhanced coagulation effectively reduced DON in the tertiary effluent at the pilot scale. The treatment showed auxiliary benefits, including dissolved organic carbon (DOC) and orthophosphate removal.
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Affiliation(s)
- Tayebeh Goli
- Department of Civil and Environmental Engineering, University of Nevada, Reno, Reno, NV 89557, USA
| | - Yasha Jathan
- Department of Civil and Environmental Engineering, University of Nevada, Reno, Reno, NV 89557, USA
| | - Yu Yang
- Department of Civil and Environmental Engineering, University of Nevada, Reno, Reno, NV 89557, USA
| | - Krishna R Pagilla
- Department of Civil and Environmental Engineering, University of Nevada, Reno, Reno, NV 89557, USA
| | - Eric A Marchand
- Department of Civil and Environmental Engineering, University of Nevada, Reno, Reno, NV 89557, USA.
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6
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Xue C, Li L, Guo C, Gao Y, Yang C, Deng X, Li X, Tai P, Sun L. Understanding the role of graphene oxide in affecting PAHs biodegradation by microorganisms: An integrated analysis using 16SrRNA, metatranscriptomic, and metabolomic approaches. JOURNAL OF HAZARDOUS MATERIALS 2023; 457:131811. [PMID: 37307733 DOI: 10.1016/j.jhazmat.2023.131811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 06/02/2023] [Accepted: 06/07/2023] [Indexed: 06/14/2023]
Abstract
Graphene oxide (GO)-promoted microbial degradation technology is considered an important strategy to eliminate polycyclic aromatic hydrocarbons (PAHs) in the environment; however, the mechanism by which GO affects microbial degradation of PAHs has not been fully studied. Thus, this study aimed to analyze the effect of GO-microbial interaction on PAHs degradation at the microbial community structure, community gene expression, and metabolic levels using multi-omics combined technology. We treated PAHs-contaminated soil samples with different concentrations of GO and analyzed the soil samples for microbial diversity after 14 and 28 days. After a short exposure, GO reduced the diversity of soil microbial community but increased potential degrading microbial abundance, promoting PAHs biodegradation. This promotion effect was further influenced by the GO concentration. In a short period of time, GO upregulated the expression of genes involved in microbial movement (flagellar assembly), bacterial chemotaxis, two-component system, and phosphotransferase system in the soil microbial community and increased the probability of microbial contact with PAHs. Biosynthesis of amino acids and carbon metabolism of microorganisms were accelerated, thereby increasing the degradation of PAHs. With the extension of time, the degradation of PAHs stagnated, which may be due to the weakened stimulation of GO on microorganisms. The results showed that screening specific degrading microorganisms, increasing the contact area between microorganisms and PAHs, and prolonging the stimulation of GO on microorganisms were important means to improve the biodegradation efficiency of PAHs in soil. This study elucidates how GO affects microbial PAHs degradation and provides important insights for the application of GO-assisted microbial degradation technology.
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Affiliation(s)
- Chenyang Xue
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lingmei Li
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cheng Guo
- School of Environmental and Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China
| | - Yingmei Gao
- Shenyang Agricultural University, Shenyang 110016, China
| | - Caixia Yang
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Xin Deng
- Yunnan Institute of Eco-environmental Science, Kunming, Yunnan 650034, China
| | - Xiaojun Li
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Peidong Tai
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Lizong Sun
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; Key Lab of Eco-restoration of Reginal Contaminated Environmental, Shenyang University, Ministry of Education, Shenyang 110044, China.
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7
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Lv M, Chen F, Zhang Z, Li D, Hassan M, Gong Z, Feng Y. Insights on enhanced antibiotic sulfamethoxazole removal by magnetic activated carbon-ballasted coagulation: Efficacy and floc properties. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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8
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Wan P, Yang X, Feng Q, Shi S, Deng B, Zhang L. Biodegradable Chitosan-Based Membranes for Highly Effective Separation of Emulsified Oil/Water. ENVIRONMENTAL ENGINEERING SCIENCE 2022; 39:907-917. [PMID: 36636559 PMCID: PMC9807252 DOI: 10.1089/ees.2022.0254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 08/03/2022] [Indexed: 06/17/2023]
Abstract
Efficient separation of oil droplets from oil/water emulsions is necessary for many energy and food industrial processes and for industrial wastewater treatment. Membrane microfiltration has been explored to address this issue because it is simple to operate and low in cost. However, filtration of oil droplets with a size around or less than 1 μm is still a major challenge. Furthermore, the fabrication process for polymeric membranes often uses hazardous organic solvents and petroleum-derived and nonbiodegradable raw materials, which pose additional environmental health and safety risk. In this study, we examined the use of chitosan-based membranes to efficiently remove oil droplets with an average diameter of ∼1 μm. The membranes were fabricated based on the rapid dissolution of chitosan in an alkaline/urea solvent system at a low temperature, thus avoiding the use of any toxic organic solvent. The chitosan membranes were further modified by dopamine and tannic acid (TA). The as-prepared membrane was characterized in terms of surface morphology, pore size distribution, and mechanical strength. The membrane performance was evaluated on a custom-designed crossflow filtration system. The results showed that the modified chitosan membrane with dopamine and TA had a water flux of 230.9 LMH at 1bar transmembrane pressure and oil droplet rejection of 99%. This water flux represented an increase of more than 10 times when compared with the original chitosan membrane without modification. The study also demonstrated excellent antifouling properties of the modified membrane that could achieve near 100% water flux recovery.
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Affiliation(s)
- Peng Wan
- Department of Biomedical, Biological and Chemical Engineering, University of Missouri, Columbia, Missouri, USA
- Guangdong Provincial Engineering and Technology Research Center for Water Affairs, Big Data and Water Ecology, Shenzhen Water Planning & Design Institute Co., Ltd., Shenzhen, China
| | - Xuanning Yang
- School of Environmental Science & Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Qinhua Feng
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China
| | - Shuyu Shi
- School of Environmental Science & Engineering, Southern University of Science and Technology, Shenzhen, China
| | - Baolin Deng
- Department of Civil and Environmental Engineering, University of Missouri, Columbia, Missouri, USA
| | - Lina Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, China
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Vineeth Kumar CM, Karthick V, Kumar VG, Inbakandan D, Rene ER, Suganya KSU, Embrandiri A, Dhas TS, Ravi M, Sowmiya P. The impact of engineered nanomaterials on the environment: Release mechanism, toxicity, transformation, and remediation. ENVIRONMENTAL RESEARCH 2022; 212:113202. [PMID: 35398077 DOI: 10.1016/j.envres.2022.113202] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/24/2022] [Accepted: 03/24/2022] [Indexed: 06/14/2023]
Abstract
The presence and longevity of nanomaterials in the ecosystem, as well as their properties, account for environmental toxicity. When nanomaterials in terrestrial and aquatic systems are exposed to the prevailing environmental conditions, they undergo various transformations such as dissociation, dissolution, and aggregation, which affects the food chain. The toxicity of nanomaterials is influenced by a variety of factors, including environmental factors and its physico-chemical characteristics. Bioaccumulation, biotransformation, and biomagnification are the mechanisms that have been identified for determining the fate of nanomaterials. The route taken by nanomaterials to reach living cells provides us with information about their toxicity profile. This review discusses the recent advances in the transport, transformation, and fate of nanomaterials after they are released into the environment. The review also discusses how nanoparticles affect lower trophic organisms through direct contact, the impact of nanoparticles on higher trophic organisms, and the possible options for remediation.
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Affiliation(s)
- C M Vineeth Kumar
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India
| | - V Karthick
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India.
| | - V Ganesh Kumar
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India
| | - D Inbakandan
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India
| | - Eldon R Rene
- Department of Water Supply, Sanitation and Environmental Engineering, IHE Delft Institute for Water Education, Westvest 7, P. O. Box 3015, 2611AX Delft, the Netherlands
| | - K S Uma Suganya
- Department of Biotechnology and Biochemical Engineering, Sree Chitra Thirunal College of Engineering, Pappanamcode, Thiruvananthapuram, 695018, Kerala, India
| | - Asha Embrandiri
- Department of Environmental Health, College of Medicine and Health Sciences, Wollo University, P. O. Box 1145, Dessie, Amhara, Ethiopia
| | - T Stalin Dhas
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India
| | - M Ravi
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India
| | - P Sowmiya
- Centre for Ocean Research, Col. Dr. Jeppiaar Research Park, Sathyabama Institute of Science and Technology, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, 600119, Tamilnadu, India
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10
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Mannich-mediated synthesis of a recyclable magnetic kraft lignin-coated copper nanostructure as an efficient catalyst for treatment of environmental contaminants in aqueous media. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120373] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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11
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A smart magnetically separable MIL-53(Al) MOF-coated nano-adsorbent for antibiotic pollutant removal with rapid and non-contact inductive heat regeneration. CHEMICAL ENGINEERING JOURNAL ADVANCES 2021. [DOI: 10.1016/j.ceja.2021.100160] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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12
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Zhu G, Lin J, Yuan Q, Wang X, Zhao Z, Hursthouse AS, Wang Z, Li Q. A biochar supported magnetic metal organic framework for the removal of trivalent antimony. CHEMOSPHERE 2021; 282:131068. [PMID: 34107421 DOI: 10.1016/j.chemosphere.2021.131068] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/25/2021] [Accepted: 05/28/2021] [Indexed: 06/12/2023]
Abstract
Metal organic framework (MOF) nanoparticles are recognized for their effective removal of metal ions from aqueous systems. However, the application of nanoparticles in a powder form as synthesized is not practical and recovery is not easy. We prepared a recyclable magnetic MOF nanoparticle phase and used a widely available waste biomass to generate biochar to support magnetic nanoparticles applied in the treatment of aqueous antimony pollution. A mushroom waste biochar was used to support a magnetic UIO-66-2COOH (denoted as BSMU). Adsorption of trivalent antimony (Sb (III)) onto the BSMU was evaluated. The results showed that optimum conditions for preparation of the BSMU were the mass ratio of MMOF to biochar 4:1, the temperature 70 °C, the time 4 h, and the initiator 4 mM. Under such conditions, sorption capacity reached 56.49 mg/g for treatment of Sb (III) solution at 100 mg/L and pH 9.1. Alkaline conditions (such as pH 9.1) are more favorable for adsorption than acidic conditions, and coexisting ions including NO3-, Cl-, SO42-, and PO43- had no significant negative effect in adsorption, and with the use of low dose, higher adsorption density achieved. The adsorption followed a pseudo second order kinetics model and Freundlich isotherm model. It resulted in a higher enthalpy changes (ΔHθ) and activation energy (Ea) of 97.56 and 8.772 kJ/mol, respectively, and enhanced the rate pf random contact between antimony and the BSMU, as indicated by a higher entropy change (ΔSθ) up to 360 J/mol·K. As a result, it readily absorbs antimony. These adsorption properties identified in this study would provide a valuable insights into the application of nanoparticles loaded biochar from abundant biomass in environmental remediation.
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Affiliation(s)
- Guocheng Zhu
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China.
| | - Jialin Lin
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China
| | - Qian Yuan
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China
| | - Xiaofeng Wang
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
| | - Zilong Zhao
- Department of Civil and Environmental Engineering, The Pennsylvania State University, 225 Sackett Building, University Park, PA, 16802, USA
| | - Andrew S Hursthouse
- School of Computing, Engineering & Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - Zhenghua Wang
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China
| | - Qingbo Li
- College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China
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13
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Heydari M, Gharagozlou M, Ghahari M, Sadjadi S. Synthesis and characterization of CoFe2O4@TiO2@HKUST-1 as a novel metal-organic framework nanocomposite. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108693] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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14
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Lv M, Liu T, Chen F, Zhang Z, Li D, Sun M, Feng Y. Interactions between magnetic particles and polyaluminum chloride on the coagulation behavior in humic acid-kaolin synthetic water treatment. ENVIRONMENTAL RESEARCH 2021; 197:111093. [PMID: 33812872 DOI: 10.1016/j.envres.2021.111093] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 03/20/2021] [Accepted: 03/24/2021] [Indexed: 06/12/2023]
Abstract
Understanding the interactions between magnetic particles (MPs) and polyaluminum chloride (PACl) is essential to elucidate the magnetic seeding coagulation (MSC) process. However, little is known about how MPs interact with the different Al species coexisting in the PACl. Here, the relationships among pollutants removal, residual Al distribution, and floc properties were comparatively studied in the MSC and traditional coagulation (TC) processes to address this issue. The response surface analysis indicated that the interaction between PACl and MPs dosages exhibited significant effects on turbidity and DOC removal. Negligible changes of dissolved Al after MPs addition indicated the weak connection between Ala and MPs. The formation of MPs-Alb-HA complexes resulted in the increase of turbidity removal from 90.2% to 96.0% and the reduction of colloidal Al from 0.67 to 0.30 mg L-1. Humic-like components could be adsorbed on MPs forming MPs-HA complexes, which enhanced the DOC removal from 55% to 58.5%. MPs addition produced loose flocs with a small floc fractal dimension value (1.74), so the average size and strength of flocs in the MSC process (425 μm and 49.7%) were lower than that in the TC process (464 μm and 58.3%). The cumulative volume percentage of large flocs (>700 μm) was decreased from 29.7% to 20.7% with MPs addition, indicating the disruption of large flocs and the reproduction of more fragments. The effective separation of these fragments by magnetic attraction maintained the efficient coagulation performance. This study provides new insights into the interaction mechanism of MPs and PACl in the MSC process.
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Affiliation(s)
- Miao Lv
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Tongtong Liu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Fan Chen
- School of Ecology and Environment, Northwestern Polytechnical University, Xi'an, 710129, China
| | - Zhaohan Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
| | - Dongyi Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Muchen Sun
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Yujie Feng
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
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15
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Ritigala T, Demissie H, Chen Y, Zheng J, Zheng L, Zhu J, Fan H, Li J, Wang D, Weragoda SK, Weerasooriya R, Wei Y. Optimized pre-treatment of high strength food waste digestate by high content aluminum-nanocluster based magnetic coagulation. J Environ Sci (China) 2021; 104:430-443. [PMID: 33985745 DOI: 10.1016/j.jes.2020.12.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 12/07/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
Coagulation-based pre-treatment efficiency of high strength digestate of food waste (HSDFW) anaerobic digestion is negated by organic ligand-catalyzed decomposition of coagulants. In this study, an efficient HSDFW pre-treatment method, magnetic seeds (MS) coagulation, was employed by using highly stable Keggin Al30 nanocluster (PAC30), MS and polyacrylamide (PAM), and its operation was optimized by evaluating the performance of removing turbidity, total suspended solids (TSS), chemical oxygen demand (COD), and total phosphorous (TP) phosphate. Results showed that at the optimum dosage of 4.82 g/L, PAC30 demonstrated excellent removals as high as 98.93% ± 0.1% of turbidity, 98.04% ± 0.1% of TSS, 58.28% ± 0.3% of total COD, 99.98% ± 0.01% of TP and 99.50% ± 0.01% of dissolved phosphate, respectively. Apparent molecular weight (AMW) and three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy analyses demonstrated more efficient removal of dissolved organic matter (DOM), particularly non-biodegradable and hydrophobic components by PAC30 than commercial coagulant. The sedimentation was much improved from 40 min by coagulation/flocculation to about 5 min settling by MS coagulation. The PAC30 based magnetic coagulation (MC) presents theoretical guidance on a cost-effective and much less footprint pre-treatment alternative for high strength wastewater.
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Affiliation(s)
- Tharindu Ritigala
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hailu Demissie
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; Department of Chemistry College of Natural Sciences, Arbaminch University 1000, Ethiopia
| | - Yanlin Chen
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jiaxi Zheng
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Libing Zheng
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jinxing Zhu
- Beijing Environmental Engineering Technology Co., Ltd, Beijing 100101, China
| | - Hua Fan
- Beijing Environmental Engineering Technology Co., Ltd, Beijing 100101, China
| | - Jiao Li
- Beijing Environmental Engineering Technology Co., Ltd, Beijing 100101, China
| | - Dongsheng Wang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | | | - Rohan Weerasooriya
- National Institute of Fundamental Studies, Hantana Road, Kandy 20000, Sri Lanka
| | - Yuansong Wei
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; National Institute of Fundamental Studies, Hantana Road, Kandy 20000, Sri Lanka.
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16
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Wan P, Gu X, Ouyang X, Shi S, Deng B, Liu J, Chu PK, Yu XF. A versatile solar-powered vapor generating membrane for multi-media purification. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117952] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Ma J, Xia W, Zhang R, Ding L, Kong Y, Zhang H, Fu K. Flocculation of emulsified oily wastewater by using functional grafting modified chitosan: The effect of cationic and hydrophobic structure. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123690. [PMID: 33264882 DOI: 10.1016/j.jhazmat.2020.123690] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Revised: 08/01/2020] [Accepted: 08/08/2020] [Indexed: 06/12/2023]
Abstract
In this work, modified chitosan flocculants (MCS) was synthesized by using chitosan (CS), acrylamide, cationic monomers and hydrophobic monomers via low-pressure UV-initiated copolymerization. The flocculation performance of MCS was evaluated in emulsified oily wastewater treatment. The effect of cationic and hydrophobic structure on oil removal was studied, and the interactions between these functional groups and the components in oil were also analyzed. Results suggested that MCS flocculants exhibited excellent oil removal efficiency in a wide pH range (2.0‒10). The flocculation efficiency of 91 % was achieved at the dosages of 0.6 mL/L (6 mg/L). During pH of 2.0-10, the optimal cationic and hydrophobic monomer was DMC and VT, respectively. Silane groups were favorable for oil removal than the other hydrophobic structures. The cationic groups expanded the optimal pH range of MCS in flocculation, whereas hydrophobic groups considerably reduced the dosage of MCS. The experimental results showed that alkane, cyclic aromatic hydrocarbon compounds in oil can be easily removed by using MC4, whereas cycloalkanes compounds was effectively removed by MC6 and MC7 because of preferable demulsification capacity, and the hydrophobic interaction, interfacial adsorption and electrostatic attraction played the dominant in flocculation. Thus, the synthesized MCS is favorable for emulsified oily wastewater treatment.
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Affiliation(s)
- Jiangya Ma
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China.
| | - Wei Xia
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China
| | - Rui Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China
| | - Lei Ding
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China
| | - Yanli Kong
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China
| | - Huiwen Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China
| | - Kun Fu
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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18
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Natural Organic Matter Removal from Raw Surface Water: Benchmarking Performance of Chemical Coagulants through Excitation-Emission Fluorescence Matrix Spectroscopy Analysis. WATER 2021. [DOI: 10.3390/w13020146] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Chemical disinfection of surface waters has been proven effective in minimizing the risk of contamination by water-borne pathogens. However, surface waters contain natural organic matter (NOM) which, upon chemical disinfection, is readily converted into hazardous disinfection-by-products. Hence, NOM removal from these waters is critical. Chemical coagulation is a readily implementable technology to minimize these undesired side-effects by NOM removal. Herein, capabilities of ferric chloride (FeCl3) and polyaluminum chloride (PACl) as pre-treatment for NOM abatement from natural raw surface water have been benchmarked. Excitation-emission fluorescence matrix (EEM) spectroscopy characterization of NOM fractions demonstrated high removal efficiency. A two-level full factorial design was employed to analyze the effects of coagulant dosage and initial pH on the removal of turbidity, humic acid-like substances and fulvic acid-like substances from the raw water. Higher removal of ~77% NOM was attained with PACl than with FeCl3 (~72%). Optimization through response surface methodology showed that the initial pH—coagulant dosage interaction was significant in removing NOM and turbidity for both PACl and FeCl3. These results identify the opportunity for coagulation technologies to prevent and minimize disinfection-by-products formation through NOM removal.
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19
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Zhu G, Xiong N, Wang C, Li Z, Hursthouse AS. Application of a new HMW framework derived ANN model for optimization of aquatic dissolved organic matter removal by coagulation. CHEMOSPHERE 2021; 262:127723. [PMID: 32799138 DOI: 10.1016/j.chemosphere.2020.127723] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 06/07/2020] [Accepted: 07/13/2020] [Indexed: 05/14/2023]
Abstract
Removing dissolved organic matter (DOM) with polyaluminium chloride is one of the primary goals of drinking water treatment. In this study, a new HMW framework was proposed, which divided the factors affecting coagulation into three parts consisting of hydraulic condition (H), metal salt (M), and background water matrix (W). In this framework, H, M and W were assumed to be interacted with each other and combined to determine coagulation efficiency. We investigated the feasibility of the framework to determine the treatment efficiency through mathematical models. Results showed that non-linear artificial neural network (ANN) model was a better fit to the experimental data than the linear partial least squares (PLS) model: the ANN model could explain 76% of the total variations while the PLS could only explain 71%. The PLS did not follow the variations of observed values adequately. These experiments showed that the interaction between the HMW framework components were not simple linear relationships. The ANN model was able to optimize the composition of the HMW framework improving the efficiency of DOM removal through the components of HMW such as velocity gradient (G value), coagulant dosage, solution pH, and background water matrix. Overall, HMW framework is a new classification of factors affecting coagulation, leading to a better understanding of the coagulation process and sensitivity to influencing variables.
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Affiliation(s)
- Guocheng Zhu
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China.
| | - Nana Xiong
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China
| | - Chuang Wang
- Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China
| | - Zhongwu Li
- College of Resources and Environmental Sciences, Hunan Normal University, Changsha, 410081, China
| | - Andrew S Hursthouse
- School of Science & Sport, University of the West of Scotland, Paisley, PA1 2BE, UK
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20
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Zhu G, Xiong N, Wang X, Hursthouse AS, Marr A. Correlation Characteristics of Electrical Conductivity of Surface Waters with the Fluorescence Excitation-Emission Matrix Spectroscopy-Parallel Factor Components of Dissolved Organic Matter. J Fluoresc 2020; 30:1383-1396. [DOI: 10.1007/s10895-020-02628-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 09/24/2020] [Indexed: 11/29/2022]
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21
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Zhang P, Zhao DQ. Characterization and Dimethyl Phthalate Flocculation Performance of the Cationic Polyacrylamide Flocculant P(AM-DMDAAC) Produced by Microwave-Assisted Synthesis. Molecules 2020; 25:E624. [PMID: 32023918 PMCID: PMC7037971 DOI: 10.3390/molecules25030624] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 01/26/2020] [Accepted: 01/28/2020] [Indexed: 11/17/2022] Open
Abstract
A composite flocculant P(AM-DMDAAC) was synthesized by the copolymerization of acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC). By using microwave (MV) assistance with ammonium persulfate as initiator, the synthesis had a short reaction time and yielded a product with good solubility. Fourier-transform infrared spectroscopy, scanning electron microscopy, and differential thermal analysis-thermogravimetric analysis were employed to determine the structure and morphology of P(AM-DMDAAC). The parameters affecting the intrinsic viscosity of P(AM-DMDAAC), such as MV time, mass ratio of DMDAAC to AM, bath time, reaction temperature, pH value, and the dosages of ammonium persulfate initiator, EDTA, sodium benzoate, and urea were examined. Results showed that the optimum synthesis conditions were MV time of 1.5 min, m(DMDAAC):m(AM) of 4:16, 0.5 wt‱ initiator, 0.4 wt‱ EDTA, 0.3 wt‱ sodium benzoate, 2 wt‱ urea, 4 h bath time, reaction temperature of 40 °C, and pH of 2. The optimal dimethyl phthalate (DMP) removal rate can reach 96.9% by using P(AM-DMDAAC), and the P(AM-DMDAAC) had better flocculation than PAM, PAC, and PFS.
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Affiliation(s)
- Peng Zhang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
| | - Dong Qin Zhao
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
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