Adsorption of heavy metals from the aqueous solution using activated biomass from Ulva flexuosa

被引:37
作者
Lekshmi, R. [1 ]
Rejiniemon, T. S. [2 ]
Sathya, Rengasamy [3 ]
Kuppusamy, Palaniselvam [4 ]
AL-mekhlafi, Fahd A. [5 ]
Wadaan, Muhammad A. [5 ]
Rajendran, P. [6 ]
机构
[1] Milad Esherif Mem MSM Coll, Dept Bot & Biotechnol, Kayamkulam, Kerala, India
[2] AJ Coll Sci & Technol, Dept Bot & Biotechnol, Thonnakal, Trivandrum, India
[3] PRIST Univ, Ctr Res & Dev, Dept Microbiol, Mahabalipuram 613 403, Tamil Nadu, India
[4] Jeonbuk Natl Univ, Dept Anim Biotechnol, Jeonju 54896, South Korea
[5] King Saud Univ, Coll Sci, Dept Zool, POB 2455, Riyadh 11451, Saudi Arabia
[6] Cent Marine Fisheries Res Inst, Kanyakumari Field Ctr, Kanyakumari 629702, Tamilnadu, India
关键词
Environmental hazard; Toxic metals; Freshwater algae; Biosorbent; Bioremediation; FRESH-WATER ALGAE; WASTE-WATER; BIOSORPTION; IONS; REMOVAL; EQUILIBRIUM; KINETICS; CADMIUM; LEAD; MICROALGAE;
D O I
10.1016/j.chemosphere.2022.135479
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 various highly toxic heavy metals from wastewater environment is an important task to improve environment. The biosorption potential of cadmium, cobalt and zinc was evaluated using Ulva flexuosa biomass. The impacts of adsorbent dosage, pH of the medium, contact time, and agitation speed were analyzed. The maximum biosorption potential was reached at pH 4.0, 0.4 g initial biosorbent dosage, contact time 40 min and 30 mg/L initial metal concentration for cadmium, while the other factors were similar to zinc, except 35 min contact time (p < 0.01). The optimum absorption was pH 4, 0.6% adsorbent dosage, after 30 min contact time with the heavy metals and 40 mg/L cobalt concentration. Heavy metal removal efficiency was 94.8 +/- 3.3%, 87.5 +/- 2.3%, and 90.8 +/- 1.4%, for cadmium, cobalt, and zinc, respectively (p < 0.01). The Langmuir constant (R2) was 0.980 for cadmium, 0.838 for cobalt and it was 0.718 for zinc. The present results revealed that the selected acid modified biomass was highly suitable for the adsorption of metal ions such as, Cd2+, Co2+ and Zn2+. The present work revealed the potential application of algal biomass for the removal of various heavy metals from the environment.
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页数:7
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