Removal of Lead from Water Using Calcium Alginate Beads Doped with Hydrazine Sulphate-Activated Red Mud as Adsorbent

Table 6

Comparison of maximum adsorption capacity of the adsorbent with other adsorbents from the literature.

S. number	Adsorbent	pH	qe (mg/g)	Reference
(1)	HRMCAB	6.0	138.63	Present work
(2)	HCl-activated red mud	4.0	6.207	Kumar Sahu et al. [19]
(3)	H2O2-treated red mud	4.0	64.79	Gupta et al. [20]
(4)	Red mud coagulant	7.0	98.695	Kong [21]
(5)	Fluted pumpkin seed shell active carbon	—	14.286	Okoye et al. [41]
(6)	Pine cone-activated carbon	6.7	27.53	Momčilović et al. [42]
(7)	Coconut shell carbon	—	30.0	Sekhar [43]
(8)	Zinc chloride-activated tamarind wood	6.5	43.85	Acharyaa et al. [44]
(9)	Poly(acrylic acid)/bentonite nanocomposite	—	93.0	Rafiei et al. [45]
(10)	Magnetic magnetite (Fe3O4) nanoparticle	5.0	53.11	Rajput et al. [46]