Research Article

Modification of One-Dimensional TiO2 Nanotubes with CaO Dopants for High CO2 Adsorption

Table 1

The different types of solid CO2 adsorbents based on their sorption/desorption temperatures.

AdsorbentTotal capacity (mmol/g)Temperature (K)Pressure (atm)Reference

Low temperature adsorbents
 Amine based
  Amine-modified mesoporous silica4.53481(Liu et al., 2010) [12]
  Amine-modified ordered mesoporous silica (OMS)1.5(Zeleňák et al., 2008) [13]
  Amine-modified OMSs0.2–1.43481(Liu et al., 2010) [12]
  Amine tetraethylenepentamine (TEPA)/OMSs4.63481(Liu et al., 2010) [12]
 MOFs/ZIFs
  MOF-23.241(Millward and Yaghi, 2005) [14]
 Carbon/activated carbon based
  Coal-based activated carbon0.33230.001(Deng et al., 2011) [15]
  Porous carbon nitride (CN)2.90298 (Li et al., 2010) [16]
  N-doped carbons template from zeolite6.92731(Xia et al., 2011) [17]
  Activated carbon/N23.75 293 1 (Zhang et al., 2010) [18]
  Activated carbon/H23.49
  Activated carbon/NH33.22
  Activated carbon1.530340 (Drage et al., 2009) [19]
  Activated carbon3.52751(Wang et al., 2008) [20]
  Carbon nanotubes (CNTs)/3-aminopropyltriethoxysilane   (APTS)2.45323(Su et al., 2011) [21]
 Alumina based
   -Al2O30.31295(Rege and Yang, 2001) [22]
 Zeolite based
  Y-type zeolite/tetraethyl-enepentamine (TEPA)4.27303–333(Su et al., 2010) [23]
  Natural zeolite2.05 298 0.1 (Ertan and Çakicio lu- zkan, 2005) [24]
  Treated zeolite/H3PO41.95
  Synthetic zeolite-5X5.49
  Synthetic zeolite-13A6.82
  LilSX0.17 1 (Brandani and Ruthven, 2004) [25]
  NaLX0.23
  CaX0.24
  13X (NaX)2.94295(Rege and Yang, 2001) [22]
 Magnesium based
  MgO/Al2O31.363331 (Li et al., 2010) [26]
Intermediate temperature adsorbents
 LDH
  Mg-Al-CO3 LDHs0.494730.05(Ram Reddy et al., 2006), [27]
High temperature adsorbents
 Lithium orthosilicates
  Li4SiO46.147731(Kato et al., 2002), [28]
 Lithium zirconates
  Li2ZrO34.557731(Ida and Lin, 2003), [29]
  Li2ZrO34.508231(Ochoa-Fernández et al., 2005), [30]
  Li2ZrO3 (nanocrystalline)6.148481(Ochoa-Fernández et al., 2006), [31]
 Calcium oxide based
  CaO2.3923(Satrio et al., 2005), [32]
  CaO/Al2O311.6923(Li et al., 2006), [33]
  Cs/CaO4.9 723 0.4 (Reddy and Smirniotis, 2004), [34]
  Rb/CaO4.5
  K/CaO3.8
  Na/CaO3.1
  CaCO31.55731(Kuramoto et al., 2003), [35]
  CaO/Al2O36.029231(Wu et al., 2007), [36]
  Nano CaO/Al2O36.02650(Wu et al., 2008), [37]