近年來,砷污染已成為一個全球性的飲用水安全問題,全球有超過20000萬人生活在砷污染高風險區(qū)域,造成嚴重的健康風險。砷元素在環(huán)境中以有機砷和無機砷兩種形態(tài)存在。相關(guān)文獻表明,有機砷化合物在水體中并不多見,其毒性一般比無機砷要小得多,而無機砷毒性高且廣泛存在。基于此,本文的研究目標污染物是水體中以無機砷形態(tài)存在的As（Ⅲ）（或亞砷酸鹽）和As（V）（或砷酸鹽）。流行病學研究證明,人體長期接觸砷能引起皮膚色素沉著、肝病,損害心血管和腎功能等,甚至引發(fā)各種類型的癌癥,因此去除飲用水中的無機砷是公共衛(wèi)生安全中的核心問題。近年來,眾多學者開始使用傳統(tǒng)的吸附方法去除污染水體中的砷。本文以來源廣泛的蜂窩煤渣（HBC）和甜根子草生物質(zhì)炭為載體,通過化學共沉淀法負載鐵/鐵氧化物后制備出復合吸附材料：負載鐵的蜂窩煤渣（鐵負載蜂窩煤渣,Fe-HBC）,煅燒獲得的蜂窩煤渣/Fe3O4復合材料（磁性蜂窩煤渣,MHBC）以及生物質(zhì)炭/Fe3O4復合材料（磁性甜子根草生物質(zhì)炭,MKGB）在內(nèi)的三類復合吸附材料�；贖BC、Fe-HBC、MHBC、MKGB這四種吸附材料,通過靜態(tài)批處理實驗和柱吸附實驗對水中As（Ⅲ）... 

【文章來源】：浙江大學浙江省 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：171 頁

【學位級別】：博士

【文章目錄】：
Acknowledgements
Abbreviations
Abstract
Abstract（中文）
Chapter 1 General Introduction
    1.1. Background
    1.2. Objectives of the study
    1.3. Thesis framework
Chapter 2 Literature review
    2.1. Arsenic and arsenic species
    2.2. Geochemistry of arsenic
    2.3. Sources and mobilization of arsenic
    2.4. Arsenic toxicity
    2.5. Arsenic remediation technologies
        2.5.1. Oxidation
        2.5.2. Ion exchange
        2.5.3. Precipitation
        2.5.4. Separation
        2.5.5. Adsorption
        2.5.6. Other remediation processes
    2.6. Iron-oxides-amended adsorbents in batch and column experiments
        2.6.1. Honeycomb briquette cinders（HBC）-a cost-effective adsorbent
        2.6.2. Biochar-a sustainable source for environment clean-up
    2.7. Strategies to enhance arsenic remediation in batch and column studies
    2.8. Field scale arsenic remediation-review of the progress
Chapter 3 Evaluation of HBC and Fe-HBC for the adsorptive removal of As（V）from aqueoussolutions
    3.1. Graphical abstract
    3.2. Introduction
    3.3. Materials and methods
        3.3.1. Reagents
        3.3.2. Preparation of adsorbent
        3.3.3. Adsorption experiments
        3.3.4. Adsorbents characterization
        3.3.5. Analytical methods
    3.4. Results and discussion
        3.4.1. Characterizations of HBC and Fe-HBC
        3.4.2. Effect of adsorbent dose on As（Ⅴ）removal
        3.4.3. Effect of solution pH on As（Ⅴ）removal
        3.4.4. Adsorption isotherms
        3.4.5. Adsorption kinetics
        3.4.6. Effect of competing ions
    3.5. Conclusions
Chapter 4 Adsorptive removal of As（Ⅴ）and As（Ⅲ）in saturated sand filter containing amended adsorbents
    4.1. Graphical abstract
    4.2. Introduction
    4.3. Materials and methods
        4.3.1. Reagents
        4.3.2. Filter design and specification
        4.3.3. Preparation of adsorbent
        4.3.4. Analytical parameters and methods
        4.3.5. Influent water
        4.3.6. Intermittent operations and analysis of samples
        4.3.7. Recycling of spent adsorbents
    4.4. Results and discussion
        4.4.1. Removal of arsenic
        4.4.2. Variations of pH
        4.4.3. Influences of co-occurring ions on arsenic removal
        4.4.4. Desorption and regeneration of the adsorbent
        4.4.5. Arsenic removal using regenerated adsorbent
        4.4.6. Adsorption mechanisms
    4.5. Conclusions
Chapter 5 As（Ⅲ,Ⅴ）removal from aqueous solutions using magnetic honeycomb briquette cinders（MHBC）:effect of calcination on adsorbents performance
    5.1. Graphical abstract
    5.2. Introduction
    5.3. Materials and methods
        5.3.1. Reagents
        5.3.2. Preparation of MHBC and calcined MHBC
        5.3.3. Batch adsorption experiments
        5.3.4. Adsorbents characterization
        5.3.5. Analytical methods
    5.4. Results and discussion
        5.4.1. Characterization results
        5.4.2. Effect of solution pH
        5.4.3. Effect of contact time and adsorption kinetics
        5.4.4. Effect of temperature
        5.4.5. Effect of phosphate anion on arsenic removal
    5.5. Conclusions
Chapter 6 Influence of calcination on magnetic honeycomb briquette cinders composite for theadsorptive removal of As（Ⅲ）in fixed-bed column
    6.1. Graphical abstract
    6.2. Introduction
    6.3. Materials and methods
        6.3.1. Reagents
        6.3.2. Preparation of MHBC and calcined MHBC
        6.3.3. Fixed-bed column studies
        6.3.4. Adsorbents characterization
        6.3.5. Analytical methods
    6.4. Results and discussion
        6.4.1. XRD analyses
        6.4.2. Column studies
        6.4.3. Desorption study
        6.4.4. As（Ⅲ）removal mechanisms
    6.5. Conclusions
Chapter 7 Effect of synthesis methods on magnetic Kans grass biochar for enhanced As（Ⅲ,Ⅴ）adsorption from aqueous solutions
    7.1. Graphical abstract
    7.2. Introduction
    7.3. Materials and methods
        7.3.1. Reagents
        7.3.2. Preparation of MKGB
        7.3.3. Adsorption experiments
        7.3.4. Adsorbents characterization
        7.3.5. Analytical methods
    7.4. Results and discussion
        7.4.1. Characterization results
        7.4.2. Adsorption studies
        7.4.3. Adsorption isotherms
        7.4.4. Adsorption kinetics
        7.4.5. Effect of co-existing ions
        7.4.6. Desorption and regeneration
    7.5. Conclusions
Chapter 8 Conclusions and future perspectives
    8.1. Major findings
    8.2. Innovation
    8.3. Challenges and future perspectives
References
Publications



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