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Tang S, Zhang L, Zhu H, Jiang SC. Coupling physiochemical adsorption with biodegradation for enhanced removal of microcystin-LR in water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 937:173370. [PMID: 38772489 DOI: 10.1016/j.scitotenv.2024.173370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 05/16/2024] [Accepted: 05/17/2024] [Indexed: 05/23/2024]
Abstract
To innovate the design of water treatment technology for algal toxin removal, this research investigated the mechanisms of cyanotoxin microcystin-LR (MC-LR) removal by a coupled adsorption-biodegradation. Eight types of woody carbonaceous adsorbents with and without Sphingopyxis sp. m6, a MC-LR degrading bacterium, were tested for MC-LR removal in water. All adsorbents showed good adsorption capability, removing 40 % to almost 100 % of the MC-LR (4.5 mg/L) within 48 h in batch experiments. Adding Sphingopyxis sp. m6 continuously promoted MC-LR biological removal, and successfully broke the barrier of adsorption capacity of tested adsorbents, removing >90 % of the MC-LR in most of the coupled adsorption-biodegradation tests, especially for those adsorbents had low physiochemical adsorption capacity. Variance partitioning analysis indicated that mesopore was the dominant contributor to adsorption capacity of MC-LR in pure adsorption treatments, which acted synergistically with electrical conductivity, polarity and total functional groups on the absorbent. Pore structure was the key factor beneficial for the growth of Sphingopyxis sp. m6 (51% contribution) and subsequent MC-LR biological removal rate (80 % contribution). Overall, pinewood-based carbonaceous adsorbents (especially pinewood activated carbon) exhibited the highest adsorption capacity towards MC-LR and provided the most favorable conditions for biological removal of MC-LR, largely because of their high mesopore volume, total functional groups and electric conductivity. The research outcomes not only deepened the quantitative understanding of mechanisms for MC-LR removal by the coupled process, but also provided theoretical basis for future materials' selection and modification during the practical application of coupled process.
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Affiliation(s)
- Shengyin Tang
- Department of Civil and Environmental Engineering, University of California, Irvine, 92697, United States; Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Lixun Zhang
- Department of Civil and Environmental Engineering, University of California, Irvine, 92697, United States; Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Haoxin Zhu
- Department of Civil and Environmental Engineering, University of California, Irvine, 92697, United States
| | - Sunny C Jiang
- Department of Civil and Environmental Engineering, University of California, Irvine, 92697, United States.
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Srikhaow A, Win EE, Amornsakchai T, Kiatsiriroat T, Kajitvichyanukul P, Smith SM. Biochar Derived from Pineapple Leaf Non-Fibrous Materials and Its Adsorption Capability for Pesticides. ACS OMEGA 2023; 8:26147-26157. [PMID: 37521671 PMCID: PMC10373191 DOI: 10.1021/acsomega.3c02328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 06/23/2023] [Indexed: 08/01/2023]
Abstract
Non-fibrous materials (NFMs) are typically discarded during pineapple leaf fiber processing. The underutilized NFM waste was proposed for use in this work as a raw material for the production of biochar . The removal of pesticides (acetamiprid, imidacloprid, or methomyl) from water was then investigated using the NFM derived biochar (NFMBC). The pseudo-second-order kinetic data suggested chemisorption of pesticide on NFMBC. While acetamiprid or imidacloprid adsorption on NFMBC occurred primarily via multi-layered adsorption (best fitted with the Freundlich isotherms), the Sips adsorption isotherms matched with the experimental data, implying heterogeneous adsorption of methomyl on the biochar surface. The adsorption capacities for acetamiprid, methomyl, and imidacloprid are 82.18, 36.16, and 28.98 mg g-1, respectively, which are in agreement with the order of the polarity (low to high) of pesticides. Adsorption capacities indicated that the NFMBC preferably removed low-polarity pesticides from water sources. Since pineapple leaves provide fibers and NFMs for materials development, this study should promote an extended agro-waste utilization approach and full-cycle resource management in pineapple fields.
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Affiliation(s)
- Assadawoot Srikhaow
- Center
of Sustainable Energy and Green Materials and Department of Chemistry,
Faculty of Science, Mahidol University, 999 Phuttamonthon Sai 4 Rd, Salaya, Nakhon Pathom 73170, Thailand
| | - Ei Ei Win
- Center
of Sustainable Energy and Green Materials and Department of Chemistry,
Faculty of Science, Mahidol University, 999 Phuttamonthon Sai 4 Rd, Salaya, Nakhon Pathom 73170, Thailand
| | - Taweechai Amornsakchai
- Center
of Sustainable Energy and Green Materials and Department of Chemistry,
Faculty of Science, Mahidol University, 999 Phuttamonthon Sai 4 Rd, Salaya, Nakhon Pathom 73170, Thailand
| | - Tanongkiat Kiatsiriroat
- Department
of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, 239, Huay Kaew Road, Muang District, Chiang
Mai 50200, Thailand
| | - Puangrat Kajitvichyanukul
- Department
of Environmental Engineering, Faculty of Engineering, Chiang Mai University, 239, Huay Kaew Road, Muang District, Chiang
Mai 50200, Thailand
- Sustainable
Engineering Research Center for Pollution and Environmental Management,
Faculty of Engineering, Chiang Mai University, 239, Huay Kaew Road, Muang District, Chiang Mai 50200, Thailand
| | - Siwaporn M. Smith
- Center
of Sustainable Energy and Green Materials and Department of Chemistry,
Faculty of Science, Mahidol University, 999 Phuttamonthon Sai 4 Rd, Salaya, Nakhon Pathom 73170, Thailand
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Zeng S, Kan E. Escherichia coli inactivation in water by sulfate radical-based oxidation process using FeCl 3-activated biochar/persulfate system. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 861:160561. [PMID: 36574557 DOI: 10.1016/j.scitotenv.2022.160561] [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: 09/01/2022] [Revised: 11/10/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Pathogenic microbes in water present great risks to environments, water resources, and human health. In the present study, for the first time, a FeCl3-activated bermudagrass-derived biochar (FA-BC) was applied to activate persulfate (PS) for E. coli inactivation. The PS activation was ascribed to the presence of Fe0 and Fe3O4 on the surface of FA-BC, and SO4·- radicals were proved to be the main role for E. coli inactivation using FA-BC activated PS system (FA-BC/PS). Decreasing the pH (5-9) and increasing the PS concentration (50-300 mg/L), reaction temperature (20-50 °C), and FA-BC dosage (100-500 mg/L) resulted in the enhancement of disinfection efficiency of E. coli using FA-BC/PS. 6.21 log reductions of E. coli were achieved within 20 min under the optimal conditions (500 mg/L FA-BC, 200 mg/L PS, pH 7, and 20 °C with 107 CFU/mL E. coli in DI water). The FA-BC/PS effectively eliminated various initial concentrations of E. coli (105-108 CFU/mL). The E. coli inactivation rate decreased from 0.1426 min-1 to 0.0883, 0.1268 min-1, and 0.1093 min-1 with the presence of 10 mg/L humic acid, 100 mg/L Cl-, and 100 mg/L HCO3-, respectively. In addition, after three cycles of disinfection tests using FA-BC/PS, the E. coli inactivation rate only slightly decreased from 0.1426 to 0.1288 min-1. The FA-BC/PS also effectively removed the E. coli in real stormwater with a 99.2 % inactivation efficiency within 180 min. The FA-BC/PS in fixed-bed column tests revealed the continuous and high inactivation of E. coli in water. Increasing the FA-BC amount (1.5 %-5 %) and PS concentration (50-200 mg/L) and decreasing the flow rate (2-4 mL/min) caused the lower E. coli concentration in effluent. Therefore, the FA-BC/PS can be considered as a promising and efficient technique for water disinfection.
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Affiliation(s)
- Shengquan Zeng
- Department of Biological and Agricultural Engineering, Texas A&M University, TX 77843, USA; Texas A&M AgriLife Research Center, Texas A&M University, TX 77843, USA
| | - Eunsung Kan
- Department of Biological and Agricultural Engineering, Texas A&M University, TX 77843, USA; Department of Wildlife, and Natural Resources, Tarleton State University, TX 76401, USA; Texas A&M AgriLife Research Center, Texas A&M University, TX 77843, USA.
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Zeng S, Kan E. Sustainable use of Ca(OH) 2 modified biochar for phosphorus recovery and tetracycline removal from water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 839:156159. [PMID: 35609690 DOI: 10.1016/j.scitotenv.2022.156159] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/28/2022] [Accepted: 05/18/2022] [Indexed: 06/15/2023]
Abstract
To prevent possible secondary pollution from phosphorus-loaded biochar (BC) in agricultural systems, this study investigated the sustainable use of Ca(OH)2 modified wood biochars (Ca-BCs) for P recovery while significantly lowering the tetracycline (TC) adsorption onto Ca-BCs. Ca-BCs were prepared via calcination of mixtures of Ca(OH)2 and wood BC under 100-500 °C for removing P and TC from water. Compared to the pristine BC (without Ca(OH)2 modification), Ca-BC100 (Ca-BC prepared at 100 °C) showed a significant increase of P adsorption capacity from 4.00 to 138.70 mg/g due to reactive interaction between P and Ca(OH)2 on Ca-BC while decrease of TC adsorption capacity from 62.17 to 20.86 mg/g owing to decrease of surface area from 260.50 to 120.26 m2/g. Batch adsorption tests implied that the P adsorption on Ca-BC100 would occur mainly via electrostatic attraction (pH > 2.1) and formation of hydroxylapatite (Ca5(PO4)3(OH)) between phosphate and Ca(OH)2. In addition, Ca-BC100 reacted with TC via electrostatic attraction (pH > 7.6), complexation, hydrogen bond, and π-π interactions. P and TC adsorption onto Ca-BC100 was a chemical, endothermic, and spontaneous process. The dynamic adsorption experiments using a fixed bed column filled with Ca-BC100 indicated that Ca-BC100 could continuously and effectively remove P and TC from water. Ca-BC100 also effectively lowered P and COD in the dairy wastewater. Under the environmentally relevant conditions, continuous treatment of water containing P and TC using the pristine BC followed by Ca-BC100 showed the pristine BC removed 96% of TC and only 6% of P from water while Ca-BC100 made high recovery of P (94% of P) with negligible TC. Therefore, Ca-BC100 could be used for effective recovery of P with negligible TC from wastewater, and then applied to agricultural systems as a sustainable and safe P-rich biofertilizer.
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Affiliation(s)
- Shengquan Zeng
- Department of Biological and Agricultural Engineering & Texas A&M AgriLife Research Center, Texas A&M University, TX 77843, USA
| | - Eunsung Kan
- Department of Biological and Agricultural Engineering & Texas A&M AgriLife Research Center, Texas A&M University, TX 77843, USA; Department of Wildlife, and Natural Resources, Tarleton State University, TX 76401, USA.
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Adsorbents Used for Microcystin Removal from Water Sources: Current Knowledge and Future Prospects. Processes (Basel) 2022. [DOI: 10.3390/pr10071235] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The increasing occurrence of toxic cyanobacteria in water sources, driven by climate change and eutrophication, is of great concern worldwide today. Cyanobacterial blooms can negatively affect water bodies and generate harmful secondary metabolites, namely microcystins (MCs), which significantly impair water quality. Various adsorbents used for MC removal from water sources were assessed in this investigation. Activated carbon constitutes the most widely used adsorbent for treating contaminated waters due to its high affinity for adsorbing MCs. Alternative adsorbents have also been proposed and reported to provide higher efficiency, but the studies carried out so far in this regard are still insufficient. The mechanisms implicated in MC adsorption upon different adsorbents should be further detailed for a better optimization of the adsorption process. Certainly, adsorbent characteristics, water pH and temperature are the main factors influencing the adsorption of MCs. In this context, optimization studies must be performed considering the effectiveness, economic aspects associated with each adsorbent. This review provides guidelines for more practical field applications of the adsorption in the treatment of waters actually contaminated with MCs.
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Hayoun B, Escudero-Curiel S, Bourouina M, Bourouina-Bacha S, Angeles Sanromán M, Pazos M. Preparation and characterization of high performance hydrochar for efficient adsorption of drugs mixture. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118797] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Activation of persulfate by biochar for the degradation of phenolic compounds in aqueous systems. CHEMICAL ENGINEERING JOURNAL ADVANCES 2022. [DOI: 10.1016/j.ceja.2021.100201] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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