Study on the Adsorption of Ammonia Nitrogen in Wastewater by Modified Walnut Shell
a low-cost adsorbent had been prepared by carbonizing walnut shells using zinc chloride as an activating agent and study had been made to explore the possibility of the absorbent for liquid phase adsorptive removal of ammonia nitrogen (NH3-N). The operation factors, such as carbonization time, pH values of solution, the initial concentration of NH3N, contact time, temperatures and the dosage of the absorbents, had been explored the effects on the adsorption of NH3-N. The adsorption capacity for NH3N was 9.79 mg/g at initial pH values between 6.6 and 6.8. It was found that the adsorption process by the adsorbent could be well described by the Langmuir isotherm and the kinetics for NH3-N adsorption followed the pseudo-second-order equation. The thermodynamics study indicated that the adsorption process was a spontaneous endothermic process, and the process was conducted by the cooperation of the physical and chemical adsorption. The SEM images showed reasonable agreement with adsorption measurements.
walnut shells adsorption ammonia nitrogen
DING Shaolan JIA Lijuan QU Zhenyu
School of Resource and Environment Shaanxi University of Science and Technology, SUST Xian, China
国际会议
吉林
英文
1532-1536
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）