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Duan FA, Wang J, Ismail S, Sung S, Cui Z, Ni SQ. Hydroxypropyl-β-cyclodextrin improves the removal of polycyclic aromatic hydrocarbons by aerobic granular sludge. ENVIRONMENTAL TECHNOLOGY 2022; 43:3262-3268. [PMID: 33944678 DOI: 10.1080/09593330.2021.1921045] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 04/16/2021] [Indexed: 06/12/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) as polar organic pollutants, their potential harm to the environment has caused widespread concern. This study describes a simple method to prepare modified aerobic granular sludge (AGS) by hydroxypropyl-β-cyclodextrin (HP-β-CD). Using HP-β-CD modified AGS as the adsorbent, the removal of specific PAHs: Fluoranthene (Fla) reached 95% comparing to 80% of the unmodified AGS. The removal of Fla was related to initial concentration, temperature and ion concentration (Na+, Mg2+). The removal efficiency of Fla reached 96.27%, 94.26% and 93.69%, when initial concentration of Fla was 10, 15 and 20 μmol/L. At temperatures of 15°C, 30°C and 45°C, the removal efficiency of Fla (15 μmol/L) gradually improved from 87.20% to 94.84% and 95.73%. The presence of Na+ and Mg2+ ions led to the deterioration of PAHs removal. With the increase of Na+ and Mg2+ concentrations, the removal efficiency of modified AGS on PAHs decreased by 3.9% and 6.5%, respectively. These findings indicate the potential application of cyclodextrins as the active sites of a complex modified polymer network for PAHs wastewater treatment.
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Affiliation(s)
- Fu-Ang Duan
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, People's Republic of China
| | - Juan Wang
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, People's Republic of China
| | - Sherif Ismail
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, People's Republic of China
- Environmental Engineering Department, Zagazig University, Zagazig, Egypt
| | - Shihwu Sung
- College of Agriculture, Forestry and Natural Resource Management, University of Hawaii at Hilo, Hilo, HI, USA
| | - Zhaojie Cui
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, People's Republic of China
| | - Shou-Qing Ni
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, People's Republic of China
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2
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Liang D, Guo W, Li D, Ding F, Li P, Zheng Z, Li J. Enhanced aerobic granulation for treating low-strength wastewater in an anaerobic-aerobic-anoxic sequencing batch reactor by selecting slow-growing organisms and adding carriers. ENVIRONMENTAL RESEARCH 2022; 205:112547. [PMID: 34902378 DOI: 10.1016/j.envres.2021.112547] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/12/2021] [Accepted: 12/07/2021] [Indexed: 06/14/2023]
Abstract
The aerobic granular sludge (AGS) process is a promising technology for wastewater treatment. However, a long start-up period for granulation and instability during long-term operation still hinder the application of AGS technology, especially for low-strength wastewater. To solve these two problems, this study tested a novel strategy involving the selection of slow-growing organisms and the addition of carriers in an anaerobic-aerobic-anoxic sequencing batch reactor (AN/O/AX_SBR). Three identical AN/O/AX_SBRs (R_Ctrl, R_CCM, and R_GAC), fed with low-strength wastewater, were operated for 120 days. R_Ctrl had no carriers, R_CCM contained cell culture microcarriers (CCM), and R_GAC contained granular activated carbon (GAC). Mature AGS was achieved within 80 days in all reactors. The carriers could reduce the maturation period of AGS by approximately 10 days (76, 66, and 69 days in R_Ctrl, R_CCM, and R_GAC, respectively) and improve the physical strength of the AGS. AGS showed a strong structure without excessive proliferation of filamentous bacteria, full-grown size (900-1100 μm), and good settleability (SVI5 was 15.4-19.4 mL/g). Microbiological analysis showed that AN/O/AX_SBRs can provide a metabolic selective pressure to select slow-growing organisms such as nitrifying bacteria (norank_f__NS9_marine_group, Ellin6067, and Nitrospira), glycogen and phosphorus accumulating organisms (GAOs: Candidatus_Competibacter and Defluviicoccus; PAOs: Candidatus_Accumulibacter and Flavobacterium). All reactors showed good performance for simultaneous nitrification, endogenous denitrification, and phosphorus removal. The removal efficiencies of total nitrogen and total phosphorous were above 70% and 80%, respectively. The cycle test showed intermediate PAO-GAO metabolism prevailed in the system, and endogenous denitrification was primarily carried out by denitrifying GAOs.
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Affiliation(s)
- Dongbo Liang
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Wei Guo
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Dongyue Li
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Fan Ding
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Peilin Li
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Zhaoming Zheng
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China
| | - Jun Li
- Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100124, China.
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Sun Y, Zhang Y, Li W, Zhang W, Xu Z, Dai M, Zhao G. Combination of the endophytic manganese-oxidizing bacterium Pantoea eucrina SS01 and biogenic Mn oxides: An efficient and sustainable complex in degradation and detoxification of malachite green. CHEMOSPHERE 2021; 280:130785. [PMID: 33971420 DOI: 10.1016/j.chemosphere.2021.130785] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 04/08/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
Recently, Mn oxides (MnOxs) have been attracting considerable interest in the oxidation of organic pollutants. However, the reduction of MnOx in these reactions leads to the deactivation of the catalyst, which must be frequently regenerated. We evaluated the application of a manganese-oxidizing bacterium (MOB) and MnOx in removing toxic dyes. We studied the co-function of a plant-endophytic MOB, Pantoea eucrina SS01, with its bio-generated MnOx and evaluated the detoxification activity and chemical transformation mechanisms of the complex in malachite green (MG) degradation. We found a synergistic effect between MnOx and the strain. Particularly, strain SS01 could adsorb MG but could not degrade it, whereas the addition of Mn(II) promoted MG degradation by the formation of a complex containing the bacterium and MnOx aggregates (SS01-bio-MnOx), with distinct morphology characteristics. The complex showed a marked sustainability in the degradation of MG into less toxic or non-toxic metabolites. In this process, strain SS01 might have enhanced the regeneration of MnOx, accelerating MG degradation. Our data not only contribute to understanding the mechanism of MG removal by the SS01-bio-MnOx complex, but also provide a scientific basis for the future application of MOB and MnOx.
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Affiliation(s)
- Yuankai Sun
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Yonggang Zhang
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Wenzhe Li
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Wenchang Zhang
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Zhenlu Xu
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Meixue Dai
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Guoyan Zhao
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China.
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4
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He Z, Zhu Y, Xu X, Wei Z, Wang Y, Zhang D, Pan X. Complex effects of pH and organic shocks on arsenic oxidation and removal by manganese-oxidizing aerobic granular sludge in sequencing batch reactors. CHEMOSPHERE 2020; 260:127621. [PMID: 32688320 DOI: 10.1016/j.chemosphere.2020.127621] [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: 03/25/2020] [Revised: 07/03/2020] [Accepted: 07/05/2020] [Indexed: 06/11/2023]
Abstract
Biological technologies are efficient and economical methods for removing toxic arsenic (As) from organic wastewaters. In this study, four sequencing batch reactors of manganese-oxidizing aerobic granular sludge (Mn-AGS) were operated in duplicate and imposed with acidic pH and high organic shocks. Batch experiments with different initial conditions were conducted to investigate the effects of pH and organic load on As(III) oxidation and removal. The results indicate that acidic pH shocks (influent pH decreased to 4.0/3.0) unexpectedly increased the As removal efficiency from 23.4-38.2% to 64.7-72.5%. The effects of high organic shocks were very complicated, as the results of the shocks were opposite twice. According to the results of the batch experiments, it was estimated that the suitable pH range for high performance was 5.0-8.5 in reaction liquid. Although acidic pH shocks initially inhibited As(III) oxidation and removal, they largely extended the reaction time of the suitable pH range and finally improved the As removal efficiency. There were many negative and positive factors affecting the As removal during the high organic shocks, leading to the unstable responses. Moreover, the microbial community was not largely changed by pH or organic shocks, and genus Hydrogenophaga (∼8%) might be responsible for the microbial As(III) oxidation. Finally, several operation strategies were proposed to obtain high performance, such as liquid pH control and aeration improvement.
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Affiliation(s)
- Zhanfei He
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Yinghong Zhu
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Xuyang Xu
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Zhen Wei
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Yanxin Wang
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Daoyong Zhang
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Xiangliang Pan
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
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5
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He Z, Wei Z, Zhao Y, Zhang D, Pan X. Enhanced performance of tetracycline treatment in wastewater using aerobic granular sludge with in-situ generated biogenic manganese oxides. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 735:139533. [PMID: 32473433 DOI: 10.1016/j.scitotenv.2020.139533] [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: 03/23/2020] [Revised: 05/10/2020] [Accepted: 05/16/2020] [Indexed: 06/11/2023]
Abstract
Wastewaters containing tetracycline (TC) are produced in many industries, and biotechnology is an economic way to treat it. In this work, aerobic granular sludge (AGS) modified with in-situ generated biogenic manganese oxides (BioMnOx), named after manganese-oxidizing AGS (Mn-AGS), was used to treat TC in wastewater. Comparisons between Mn-AGS and AGS indicated that Mn-AGS showed superior TC resistance and treatment results than AGS. The activity of Mn-AGS was not inhibited by TC content as high as 20 mg/L. Wastewater TC could be removed stably and efficiently (95.2 ± 0.8%) in the Mn-AGS reactors after 119 days' acclimation. Furthermore, TC may be first adsorbed on Mn-AGS sludge and then degraded by both microbial community and BioMnOx. TC adsorption could be greatly improved by increasing solution pH, which can be attributed to the increase in negatively charged TC species at high pHs. The microbial community changed greatly after TC exposure and some TC-resistant bacteria, such as Flavobacterium, were enriched in the final sludge. Moreover, the antibiotic resistance genes (ARGs) tetA, tetG, and tetX largely increased and the microorganisms were TC-resistant through efflux pumps and antibiotic inactivation mechanisms. This work suggests a new biological-chemical coupling strategy, Mn-AGS, to treat antibiotics in organic wastewater with high efficiency and stability.
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Affiliation(s)
- Zhanfei He
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Zhen Wei
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Yuanhai Zhao
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Daoyong Zhang
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Xiangliang Pan
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
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6
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Zhang H, Guan W, Zhang L, Guan X, Wang S. Degradation of an Organic Dye by Bisulfite Catalytically Activated with Iron Manganese Oxides: The Role of Superoxide Radicals. ACS OMEGA 2020; 5:18007-18012. [PMID: 32743173 PMCID: PMC7391359 DOI: 10.1021/acsomega.0c01257] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 06/30/2020] [Indexed: 05/11/2023]
Abstract
Metal-activated bisulfite systems have been widely used to treat recalcitrant wastewater. However, due to the disadvantages of their narrow effective pH range and difficulty in recovering metal ions, homogeneous systems are severely limited in practical applications. To overcome these problems, Fe/Mn bimetallic catalysts with different molar ratios were prepared using a simple sol-gel method to activate bisulfite. Influential factors, such as catalyst and system types, catalyst dosage, bisulfite concentration, pH value, and bisulfite addition modes, were investigated. The new system exhibited a wide effective pH range and high degradation efficiency, and it was found that the dissolved oxygen content played an important role in the activation system. The radical quenching test showed that a superoxide radical (O2 •-), instead of a hydroxyl radical (HO•) or a sulfate radical (SO4 •-), was the main oxide species for the degradation of rhodamine B (RhB).
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Affiliation(s)
- Haifeng Zhang
- School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Wenjia Guan
- School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Lanhe Zhang
- School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Xiaohui Guan
- School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Shengli Wang
- School of Chemistry Engineering, Northeast Electric Power University, Jilin 132012, China
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7
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Xu J, Pang H, He J, Nan J. The effect of supporting matrix on sludge granulation under low hydraulic shear force: Performance, microbial community dynamics and microorganisms migration. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 712:136562. [PMID: 32050387 DOI: 10.1016/j.scitotenv.2020.136562] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 12/12/2019] [Accepted: 01/04/2020] [Indexed: 06/10/2023]
Abstract
Granular sludge usually takes extracellular polymers (EPS) as matrices for colonizing microorganisms and maintaining structural stability. However, the low strength of EPS threatens the disintegration of granules, especially under low hydraulic shear force. To accelerate the formation and enhance the stability of granules, micro-sized melamine (ME) sponges (RA) and polyurethane (PU) sponges (RB) were screened out as matrix substitutes for developing aerobic granular biofilm (AGB) in this study. The superficial gas velocity was 0.8 cm s-1. Both reactors achieved over 95% ammonium nitrogen removal efficiency within 10 days. During stabilization period, the chemical oxygen demand, total nitrogen and total phosphorus removal efficiencies were 90.5%, 70% and 95% in RA and 87.8%, 83% and 88% in RB, respectively. Confocal laser scanning microscopy (CLSM) detection revealed that β-polysaccharide was more concentrated in the outer layer in PU-AGB but uniformly dispersed in ME-AGB. The denitrifying phosphorus accumulating organisms (Flavobacterium) was dominant in RA, while the denitrifying glycogen accumulating organisms (Candidatus_Competibacter) was dominant in RB. Fluorescence in situ hybridization (FISH) analysis indicated that the microbial distribution in ME-AGB was relatively uniform, while there was a significant migration of functional microorganisms in PU-AGB. The super-hydrophilicity of ME and the high hydrophobicity of PU may be the main reasons for these differences. Overall, this study indicated that ME sponge is a more suitable material for supporting AGB than PU sponge.
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Affiliation(s)
- Jie Xu
- School of Environment, Harbin Institute of Technology (HIT), Harbin 150090, China
| | - Heliang Pang
- School of Environment, Harbin Institute of Technology (HIT), Harbin 150090, China.
| | - Junguo He
- Guangzhou University, Guangzhou 510006, China
| | - Jun Nan
- School of Environment, Harbin Institute of Technology (HIT), Harbin 150090, China
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8
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He Z, Zhang Q, Wei Z, Zhu Y, Pan X. Simultaneous removal of As(III) and Cu(II) from real bottom ash leachates by manganese-oxidizing aerobic granular sludge: Performance and mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 700:134510. [PMID: 31629267 DOI: 10.1016/j.scitotenv.2019.134510] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/20/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Manganese-oxidizing aerobic granular sludge (Mn-AGS) is a novel extension of AGS technology to treat arsenic (As) in organic wastewater. In this study, Mn-AGS was first applied to treat real wastewater (bottom ash leachates) containing high levels of As(III) and Cu(II) in a sequencing batch reactor (SBR) for 91 days. Influent and effluent As(III), As(V), Cu(II), as well as pH and chemical oxygen demand (COD) were monitored daily, and sludge was collected regularly for morphological observation, chemical characterization, and microbial analysis. The results indicated that As(III) and Cu(II) could be efficiently removed from wastewater (∼83% and ∼100%, respectively), but the performance was sensitive to pH variation, especially for As(III). The removed As and Cu were mostly bound to carbonates (60.2 ± 2.0% and 70.0 ± 0.6%, respectively) and Fe/Mn oxides (28.2 ± 1.6% and 14.6 ± 0.5%, respectively) in the final sludge. Influent As(III) was partially oxidized into As(V), and high fractions of As(V) were obtained in the Fe/Mn oxide-bound phase. Unexpectedly, microbial analysis revealed that community richness was only slightly changed when the influent was acidized (pH 4.0) but greatly reduced after the influent pH back to 6.0. It could be explained by that acid-fast bacteria rapidly grew after pH recovery and eliminated non-acid-fast bacteria. This work further supported the practical application of Mn-AGS to treat As(III)-containing organic wastewaters.
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Affiliation(s)
- Zhanfei He
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Qingying Zhang
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Zhen Wei
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Yinghong Zhu
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Xiangliang Pan
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
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9
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Mo C, Faheem M, Aziz S, Jian S, Xue W, Yuyang T, Shuang D, Guangshan Z. Hydroxyl porous aromatic frameworks for efficient adsorption of organic micropollutants in water. RSC Adv 2020; 10:26335-26341. [PMID: 35519788 PMCID: PMC9055414 DOI: 10.1039/d0ra04222f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 06/30/2020] [Indexed: 12/02/2022] Open
Abstract
Environmental pollution is an important issue in sustainable human development. People give great importance to environmental protection, especially with regards to increasingly scarce water resources. Water pollution is becoming more and more serious due to the existence of organic micropollutants. As a platform with good stability, porous aromatic frameworks (PAFs) have been widely studied. Because of their high surface area and thermal stability, they are considered to be a good sewage treatment agent. However, the aromatic nature of PAFs makes their skeletons mostly hydrophobic. This characteristic of PAFs seriously affects their diffusion rate in water as an adsorbent, resulting in a low adsorption rate. In this work, we synthesized a series of hydroxyl functionalized porous aromatic frameworks (PAF-80, PAF-81, and PAF-82) via the Sonogashira–Hagihara cross-coupling reaction, which created polar motifs on the hydrophobic surfaces, and carried out adsorption tests on typical organic micropollutants in water such as bisphenol A (BPA), 2-naphthol (2-NO) and p-chloroxylenol (PCMX). Among the three PAFs, PAF-82 exhibited the highest BET surface area, polar active sites, and a high degree of conjugation, which led to the best adsorption performance compared to that of PAF-80 and PAF-81. The Langmuir adsorption capacity of PAF-82 for BPA, 2-NO, and PCMX is 689 mg g−1, 431 mg g−1, and 480 mg g−1, respectively, which surpasses most previously reported adsorbents. In addition, after 5 cycles of regeneration, it still maintained a high removal rate for pollutants. The obtained results reveal that micropollutant adsorption in water is not controlled by a single factor, but is the result of a synergy of multiple factors, including specific surface area, polar functional groups, pore size distribution, and skeleton conjugation. Our study has revealed the great potential of hydroxyl PAFs for efficient adsorption of organic micropollutants in water. A series of hydroxyl functionalized PAF materials (PAF-80, PAF-81, and PAF-82) were synthesized, which create polar channels to the hydrophobic surfaces and explored as efficient adsorption of organic micropollutants in water.![]()
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Affiliation(s)
- Chen Mo
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
| | - Muhammad Faheem
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
| | - Saba Aziz
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
| | - Song Jian
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
| | - Wang Xue
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
| | - Tian Yuyang
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
| | - Ding Shuang
- Institute for Interdisciplinary Biomass Functional Materials Studies
- Jilin Engineering Normal University
- Changchun 130052
- P. R. China
| | - Zhu Guangshan
- Key Laboratory of Polyoxometalate Science of the Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- P. R. China
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10
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Zhu C, Xu J, Song S, Wang J, Li Y, Liu R, Shen Y. TiO 2 quantum dots loaded sulfonated graphene aerogel for effective adsorption-photocatalysis of PFOA. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 698:134275. [PMID: 31505352 DOI: 10.1016/j.scitotenv.2019.134275] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 09/02/2019] [Accepted: 09/02/2019] [Indexed: 05/27/2023]
Abstract
With the pollution of perfluoroalkyl substances (PFASs) became increasingly serious, the researches focused on removal of PFASs by adsorption-photocatalysis method has attracted considerable attention. To make the catalyst TiO2 disperse uniformly as quantum dots onto hydrophobic surface which was liable to attract perfluorooctanoic acid (PFOA), the surfactant sodium dodecyl sulfate (SDS) were used in this work, which not only connected the hydrophilic TiCl3 to the hydrophobic sulfonated graphene (SG) nanosheets, but also behaved as the molecular template for controlled nucleation and growth of the nanostructured TiO2. After 3D SG-TiO2 QD nanosheets were fabricated, a series of 3D SG-TiO2 QD aerogels were self-assembled by ice-template. TiO2 uniformly distributed on the surface of SG aerogel at QD size level (2-3 nm) and the size of TiO2 could be effectively regulated by concentration of SDS. Compared with aggregated TiO2 material, 3D SG-TiO2 QD aerogels owned higher adsorption and photocatalytic performance. Benefiting from the hydrophobic surface of 3D SG as well as dispersed TiO2 QDs, 3D SG-TiO2 QD could enrich PFOA instantaneously (0.0381/s) and photocatalytic decomposed them effectively (1.898 E-4/s). PFOA degradation by hole and hydroxyl radicals proceeded via a stepwise mechanism. The column made of 3D SG-TiO2 QD could remove PFOA persistently in cycles of permeation. 3D SG-TiO2 QD possessed powerful adsorption-photocatalytic decomposition capability of PFOA and steady reusability performance. The present work highlights the individual roles and synergistic effect of TiO2 QD and 3D SG for effectively removing PFOA.
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Affiliation(s)
- Chao Zhu
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, PR China
| | - Jinli Xu
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, PR China
| | - Shuang Song
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, PR China
| | - Jun Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, Department of Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
| | - Yungui Li
- Sichuan Provincial Sci-Tech Cooperation Base of Low-cost Wastewater Treatment Technology, Department of Environmental Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Renlan Liu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
| | - Yi Shen
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, PR China.
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He Z, Wei Z, Zhang Q, Zou J, Pan X. Metal oxyanion removal from wastewater using manganese-oxidizing aerobic granular sludge. CHEMOSPHERE 2019; 236:124353. [PMID: 31319307 DOI: 10.1016/j.chemosphere.2019.124353] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 07/06/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
As, Sb, and Cr are redox-sensitive and toxic heavy metal(loid)s, and redox reactions are usually involved in the treatment of substrates containing these elements. In this study, manganese-oxidizing aerobic granular sludge (Mn-AGS) was obtained by continuously adding Mn(II) to the sludge in a sequencing batch reactor (SBR). Morphological observations, and analyses of extracellular polymeric substances (EPS), Mn valence-states, and microbial communities were performed on the resulting sludge. After 50 days of cultivation, biogenic Mn(III,IV) oxides (bio-MnOx) accumulated up to approximately 25 mg Mn/g suspended solids (SS). X-ray photoelectron spectroscopy (XPS) revealed that the percentage of Mn(III,IV) was 87.6%. The protein (PN) component in EPS increased from 80.3 to 87.8 mg/g volatile suspended solids (VSS) during cultivation, which might be favorable for sludge granulation and heavy metal(loid) removal. Batch experiments showed that Mn-AGS was better at oxidizing As(III)/Sb(III) into less toxic As(V)/Sb(V) than traditional AGS. Remarkably, the results indicated that Mn-AGS did not oxidize Cr(III) but was able to reduce Cr(VI) into relatively harmless Cr(III). This work provided a new promising method with which to treat As(III), Sb(III), and Cr(VI) in wastewaters.
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Affiliation(s)
- Zhanfei He
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Zhen Wei
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Qingying Zhang
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Jinte Zou
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China
| | - Xiangliang Pan
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
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