Journal of Inorganic Materials, Volume. 35, Issue 3, 315(2020)
A low-cost oyster shell was carried to prepare biogenic calcium carbonate (bio-CaCO3) to remediate Pb(II) and methyl orange (MO) from contaminated water. The morphology, composition and structure of the material were analyzed mainly by scanning electron microscope (SEM), thermogravimetric analysis (TGA), X-ray fluorescence (XRF). The adsorption of Pb(II) and MO by bio-CaCO3 was studied by combining batch experiments and microstructure characterization. Batch sorption experiments showed that 45% MO was removed by bio-CaCO3 (msorbent/Vsolvent=0.2 g/L, [MO]initial=60 mg/L). An obviously morphology change took place after MO adsorbed onto bio-CaCO3. The maximum sorption capacity of bio-CaCO3 for Pb(II) is 1775 mg/g (pH=5.0, T=298 K), which is higher than that of the traditional nanomaterials such as bentonite and activated carbon. The Pb(II) removal mechanism is expected to be CaCO3+ Pb(II)→PbCO3, where the ΔHθ, ΔSθ and ΔGθ of Pb(II) sorption by bio-CaCO3 (pH=5.0, T=298K) are -7.64 kJ/mol, -17.92 J/(mol·K) and -2.30 kJ/mol, respectively. More regular products with quadrangular structure are formed after Pb(II) adsorption. The results highlight that the bio-CaCO3 has a high Pb(II) and MO sorption efficiency, demonstrating that it is a promising adsorbent material in environmental pollution management.
Get Citation
Copy Citation Text
Xudong DU, Chengyuan TANG, Xiaoli YANG, Jianbo CHENG, Yuke JIA, Shubin YANG.
Category: RESEARCH PAPER
Received: Jul. 15, 2019
Accepted: --
Published Online: Jan. 27, 2021
The Author Email: YANG Shubin (shubinyang@ytu.edu.cn)