New Generation Material for the Removal of Arsenic from Water - Advanced Materials for Agriculture, Food and Environmental Safety - page 76

an adsorbent. h e maximum adsorption capacity of 12.4 μg/g was reported
at an arsenic concentration of 360 μg/L and other parameter ef ects are
shown in Table 3.8.

3.1.6 New Generation Materials

For the removal of arsenic from water, hydrous zirconium oxide was loaded
successfully onto polymeric adsorbent (D401) to obtain a new adsorbing
material (D401-Zr) [126]. TiO 2 nanoi bers (NFs) [127] have been used for
arsenic removal, and the potential of chitosan-coated sand (CCS) and iron-
chitosan-coated sand (ICCS) [128] toward the removal of both As(V) and
As(III) from aqueous systems. A novel adsorbent, iron(III) chelate of an
amino-functionalized polyacrylamide-grat ed coconut coir pith (Fe(III)-
A-PGCP) [129], was prepared and used for the removal of arsenic(V) from
aqueous solutions. A high ei ciency of contaminant removal by nanoscale
zerovalent iron (nZVI) [130] and the i rst example of arsenite and arsenate
removal from water by incorporation of arsenic into the structure of nano-
crystalline iron(III) oxide [131] have ot en been reported. Composites
of cellulose@iron oxide nanoparticles [132] have been used for arsenic
removal and the ei cacy results are given in Table 3.9.

3.2 Arsenic Desorption/Sorbent Regeneration

Once the sorbent becomes exhausted, the metals must be recovered and
the sorbent regenerated. Desorption and sorbent regeneration is a critical

Table 3.9 New generation materials with dif erent parameters.

Adsorbent pH Concentration

range

Capacity (mg/g)
As(III) As(V)

Ref.

Zr-Loaded Resin
(D401-Zr)

6.3-9.2 10 mg/kg -

- 11.84

[126]

TiO 2 nanoi bers (NFs) 7 0.0133 mmol/kg - - [127]

chitosan-coated sand
(CCS)
iron−chitosan-coated
sand

7 100 to 1000 μg/L 17 23

26 56

[128]

(Fe(III)-A-PGCP) 7 10 - 300 mg/L - 107.8 [129]

cellulose@iron oxide NPs 7 50-100 mg/L 23.16 32.11 [132]