Production of an iron-coated adsorbent for arsenic removal by hydrothermal carbonization of olive pomace: Effect of the feedwater pH

被引:39
作者
Capobianco, Laura [1 ]
Di Caprio, Fabrizio [1 ]
Altimari, Pietro [1 ]
Astolfi, Maria Luisa [1 ]
Pagnanelli, Francesca [1 ]
机构
[1] Univ Sapienza Roma, Dept Chem, Ple Aldo Moro 5, I-00185 Rome, Italy
关键词
Biosorption; Alkaline pH; Two-stage process; Granulometry; Stability; Hydrolysis; MAGNETIC BIOCHAR; ACTIVATED CARBON; ADSORPTION PROCESS; BIOMASS WASTE; WATER; HYDROCHAR; BIOSORPTION; TEMPERATURE; EXTRACTION; CONVERSION;
D O I
10.1016/j.jenvman.2020.111164
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The removal of arsenic from water by adsorption is currently hindered by the elevated cost of conventional adsorbent materials. To overcome this limit, an innovative iron-coated adsorbent was produced by hydrothermal carbonization (170 degrees C, 30 min) of olive pomace, an inexpensive byproduct of the olive oil production. Hydrothermal carbonization experiments were performed starting from olive pomace dispersions in solutions with acidic, neutral and alkaline pH, in presence and absence of FeCl3. Acidic conditions improved the carbonization, ensuring reduced H/C and O/C ratios, and increased the adsorbent stability. However, acidic pH yielded unsatisfactory iron coating, with only 32% of the iron dissolved in the initial solution transferred to the produced hydrochar. Under alkaline pH, 96% of the iron in the feedwater was, in contrast, stably dispersed over the hydrochar surface, giving the highest maximum arsenic adsorption capacity (4.1 mg/g). However, alkaline pH promoted biomass hydrolysis, causing the loss of 60% and 87% of the total C and N, respectively, and reducing the stability of the produced hydrochar. A two-stage process was tested to overcome these issues, including hydrothermal carbonization under acidic pH with FeCl3, followed by the addition of NaOH. This process prevented biomass hydrolysis yielding a stable hydrochar. However, as compared to the one-stage alkaline synthesis, the two-stage process produced an hydrochar with reduced arsenic adsorption capacity (1.4 mg/g), indicating that biomass hydrolysis could positively influence hydrochar adsorption characteristics, possibly by increasing the specific surface area. Indications are then provided on how to optimize the two-stage process in order to produce a hydrochar with both satisfactory stability and arsenic adsorption capacity.
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页数:10
相关论文
共 46 条
[1]  
Agency of Toxic Substances and Disease Registry, 2019, ATSDRS SUBST PRIOR L
[2]   Adsorption behavior of hydrothermally treated municipal sludge & pulp and paper industry sludge [J].
Alatalo, Sara-Maaria ;
Repo, Eveliina ;
Makila, Ermei ;
Salonen, Jamb ;
Vakkilainen, Esa ;
Sillanpaa, Mika .
BIORESOURCE TECHNOLOGY, 2013, 147 :71-76
[3]  
Altimari P., 2017, ADSORPTION PROCESS W, P205, DOI [10.1007/978-3-319-58136-1, DOI 10.1007/978-3-319-58136-1]
[4]  
[Anonymous], 2012, ARSENIC METALS FIBRE
[5]   A new rapid treatment of human hair for elemental determination by inductively coupled mass spectrometry [J].
Astolfi, Maria Luisa ;
Protano, Carmela ;
Marconi, Elisabetta ;
Massimi, Lorenzo ;
Brunori, Marco ;
Piamonti, Daniel ;
Migliara, Giuseppe ;
Vitali, Matteo ;
Canepari, Silvia .
ANALYTICAL METHODS, 2020, 12 (14) :1906-1918
[6]   Optimization and validation of a fast digestion method for the determination of major and trace elements in breast milk by ICP-MS [J].
Astolfi, Maria Luisa ;
Marconi, Elisabetta ;
Protano, Carmela ;
Vitali, Matteo ;
Schiavi, Elisa ;
Mastromarino, Paola ;
Canepari, Silvia .
ANALYTICA CHIMICA ACTA, 2018, 1040 :49-62
[7]   The ionization constant of water over wide ranges of temperature and density [J].
Bandura, AV ;
Lvov, SN .
JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA, 2006, 35 (01) :15-30
[8]   Life cycle analysis of hydrothermal carbonization of olive mill waste: Comparison with current management approaches [J].
Benavente, Veronica ;
Fullana, Andres ;
Berge, Nicole D. .
JOURNAL OF CLEANER PRODUCTION, 2017, 142 :2637-2648
[9]  
Biller P, 2016, WOODHEAD PUBL SER EN, P509, DOI 10.1016/B978-0-08-100455-5.00017-5
[10]   Extraction and characterization of lignin from olive pomace: a comparison study among ionic liquid, sulfuric acid, and alkaline treatments [J].
Cequier, Enrique ;
Aguilera, Johanna ;
Balcells, Merce ;
Canela-Garayoa, Ramon .
BIOMASS CONVERSION AND BIOREFINERY, 2019, 9 (02) :241-252