7e2d973f43804d11e36c5ac270e83661 agriculture_a2021v11n8p714.pdf 4182cef06d2d26e6bfdcacbeb0996a7f6813ab6b agriculture_a2021v11n8p714.pdf 0d8fa24f009d8dfc099065b018f06f5df6c28b00efb304f6411fb999aec376cb agriculture_a2021v11n8p714.pdf Title: Preparation and Characterization of Novel Magnesium Composite/Walnut Shells-Derived Biochar for As and P Sorption from Aqueous Solutions Subject: Elevated or unnatural levels of arsenic (As) and phosphorus (P) concentrations in soils and waterbodies from anthropogenic sources can present significant hazards for both natural ecosystems and human food production. Effective, environmentally friendly, and inexpensive materials, such as biochar, are needed to reduce mobility and bioavailability of As and P. While biochar features several physicochemical properties that make it an ideal contaminant sorbent, certain modifications such as mineral-impregnation can improve sorption efficiencies for targeted compounds. Here, we conducted sorption experiments to investigate and quantify the potential utility of magnesium (Mg) for improving biochar sorption efficiency of P and As. We synthesized a Mg-modified walnut shells-derived biochar and characterized its ability to remove As and P from aqueous solutions, thereby mitigating losses of valuable P when needed while, at the same time, immobilizing hazardous As in ecosystems. SEM-EDX, FTIR and elemental analysis showed morphological and functional changes of biochar and the formation of new Mg-based composites (MgO, MgOHCl) responsible for improved sorption potential capacity by 10 times for As and 20 times for P. Sorption efficiency was attributed to improved AEC, higher SSA, chemical forms of sorbates and new sorption site formations. Synthetized Mg-composite/walnut shell-derived biochar also removed >90% of P from real samples of wastewater, indicating its potential suitability for contaminated waterbody remediation. Keywords: biochar; phosphorus; arsenic; sorption; Mg-impregnation; chemical modification Author: Vladimír Frišták, Martin Pipíška, Vladimír Turčan, Stephen M. Bell, Haywood Dail Laughinghouse IV, Libor Ďuriška and Gerhard Soja Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Thu Aug 19 07:54:28 2021 CEST ModDate: Fri Aug 20 02:20:37 2021 CEST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 13 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 3499408 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- RSHXZV+VnURWPalladioL Type 1 Custom yes yes no 10 0 ZHXHFQ+URWPalladioL-Ital Type 1 Custom yes yes no 15 0 EJFGHR+URWPalladioL-Bold Type 1 Custom yes yes no 20 0 EDPLAH+URWPalladioL-Roma Type 1 Custom yes yes no 24 0 DOJRBU+EURM10 Type 1 Builtin yes yes no 28 0 SSNIUI+VnURWPalladioL-Bold Type 1 Custom yes yes no 32 0 ELVRBN+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 40 0 MCBCCI+SourceSansRoman-Regular Type 1C Custom yes yes no 62 0 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PJNKJB+PalatinoLinotype,Bold CID TrueType Identity-H yes yes yes 264 0 PJOGBH+Arial CID TrueType Identity-H yes yes yes 270 0 PJNKJC+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 276 0 PJNKKC+PalatinoLinotype CID TrueType Identity-H yes yes yes 279 0 PJNKKD+PalatinoLinotype TrueType WinAnsi yes yes no 285 0 PJNKLF+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 288 0 Jhove (Rel. 1.22.1, 2019-04-17) Date: 2022-03-10 03:07:16 CET RepresentationInformation: agriculture_a2021v11n8p714.pdf ReportingModule: PDF-hul, Rel. 1.12.1 (2019-04-17) LastModified: 2022-01-26 11:40:32 CET Size: 3499408 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 450 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7b69c6ba Item: Title: Materials and Methods Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@46daef40 Children: Item: Title: Biochar Production and Chemical Modification Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@12f41634 Item: Title: Physicochemical Characterization Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@13c27452 Item: Title: Arsenic and Phosphorus Model Sorption Experiments Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@262b2c86 Children: Item: Title: Effect of Contact Time Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@371a67ec Item: Title: Kinetic Models Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@5ed828d Item: Title: Effect of Sorbate Initial Concentration Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@50d0686 Item: Title: Applied Models of Adsorption Isotherms Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7a3d45bd Item: Title: Sorption of Phosphorus from Real Liquid Wastes Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1e7c7811 Item: Title: Results and Discussion Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77ec78b9 Children: Item: Title: Characterization of Pyrolysis Products Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1a3869f4 Item: Title: Sorption Experiments Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@a38d7a3 Item: Title: Conclusions Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77f99a05 Item: Title: References Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@63440df3 Info: Title: Preparation and Characterization of Novel Magnesium Composite/Walnut Shells-Derived Biochar for As and P Sorption from Aqueous Solutions Author: ざぬちつどねロひ〠うひどㅡぴメに〬〠きちひぴどの〠ぐどばロㅡにち〬〠ざぬちつどねロひ〠ごふひㅜ牜〰ちの〬〠こぴづばとづの〠き〮〠あづぬぬ〬〠えちべぷははつ〠いちどぬ〠がちふでとどのでとはふびづ〠ぉざ〬〠がどぢはひ〠ㅜ〱㙜〰ふひどㅡにち〠ちのつ〠ぇづひとちひつ〠こはなち Subject: Elevated or unnatural levels of arsenic (As) and phosphorus (P) concentrations in soils and waterbodies from anthropogenic sources can present significant hazards for both natural ecosystems and human food production. Effective, environmentally friendly, and inexpensive materials, such as biochar, are needed to reduce mobility and bioavailability of As and P. While biochar features several physicochemical properties that make it an ideal contaminant sorbent, certain modifications such as mineral-impregnation can improve sorption efficiencies for targeted compounds. Here, we conducted sorption experiments to investigate and quantify the potential utility of magnesium (Mg) for improving biochar sorption efficiency of P and As. We synthesized a Mg-modified walnut shells-derived biochar and characterized its ability to remove As and P from aqueous solutions, thereby mitigating losses of valuable P when needed while, at the same time, immobilizing hazardous As in ecosystems. SEM-EDX, FTIR and elemental analysis showed morphological and functional changes of biochar and the formation of new Mg-based composites (MgO, MgOHCl) responsible for improved sorption potential capacity by 10 times for As and 20 times for P. Sorption efficiency was attributed to improved AEC, higher SSA, chemical forms of sorbates and new sorption site formations. Synthetized Mg-composite/walnut shell-derived biochar also removed >90% of P from real samples of wastewater, indicating its potential suitability for contaminated waterbody remediation. Keywords: biochar; phosphorus; arsenic; sorption; Mg-impregnation; chemical modification Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Thu Aug 19 07:54:28 CEST 2021 ModDate: Fri Aug 20 02:20:37 CEST 2021 ID: 0x2da264674e2aebfc67f21b149eb65c43, 0x2da264674e2aebfc67f21b149eb65c43 Filters: FilterPipeline: FlateDecode Fonts: Type1: Font: BaseFont: SSNIUI+VnURWPalladioL-Bold FontSubset: true FirstChar: 161 LastChar: 189 FontDescriptor: FontName: SSNIUI+VnURWPalladioL-Bold Flags: Symbolic FontBBox: -152, -301, 1000, 935 FontFile: true EncodingDictionary: Differences: true Font: BaseFont: JSMRPX+CMSY10 FontSubset: true FirstChar: 0 LastChar: 33 FontDescriptor: FontName: JSMRPX+CMSY10 Flags: Symbolic FontBBox: -29, -960, 1116, 775 FontFile: true Font: BaseFont: EJFGHR+URWPalladioL-Bold FontSubset: true FirstChar: 2 LastChar: 154 FontDescriptor: FontName: EJFGHR+URWPalladioL-Bold Flags: Symbolic FontBBox: -152, -301, 1000, 935 FontFile: true EncodingDictionary: 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