期刊
DESALINATION AND WATER TREATMENT
卷 57, 期 50, 页码 23987-24003出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/19443994.2016.1140078
关键词
Cadmium removal; Precipitation; Golden apple snail shell; Waste water; Sorption isotherm
资金
- National Natural Science Foundation of China [U1131006, 30770403, 30900187]
- Training Project for High-level Talents of Guangdong Regular Higher Education Institutions
- Science and Technology Program of Guangdong province, China [2015B090903077]
- President Foundation of South China Agricultural University [2009K029]
- China Scholarship Council
Golden apple snail (GAS) is one of the 100 worst invasive alien species. With the application of molluscicides to kill and control the spreading of these snails, a large amount of dead GAS shells are remained in many farms. This study ascertained the characteristics and removal of cadmium (Cd) by the GAS shell (GASS) powders and the associate mechanisms. Results showed that when the concentration of shell powder increased from 0.05 to 10.00g/L, pH from 1.5 to 5.5, contact time from 2 to 100min, and temperature from 10 to 50 degrees C, the Cd removal efficiency from the solution increased gradually and reached an equilibrium condition. The Cd removal efficiency decreased as the initial Cd concentration increased from 5 to 500mg/L. The changes in the amount of Cd removal conformed to the Langmuir model with a capacity of 81.301mg/g. A thermodynamic analysis indicated that the Cd removal by the GASS powder was an endothermic and spontaneous process. Our study also revealed that the solution pH was affected greatly by the amount of GASS powder. The powder X-ray diffractometer (XRD) and scanning electron microscopy indicated that the CdCO3 precipitated on the surface of GAS shells. The Cd removal was related to the ion exchange and the micro-precipitation with a depletion of aragonite and calcite. This study suggests that shells of GAS could be used as an effective biomaterial for Cd removal from contaminated water.
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