ترجمه مقاله نقش ضروری ارتباطات 6G با چشم انداز صنعت 4.0
- مبلغ: ۸۶,۰۰۰ تومان
ترجمه مقاله پایداری توسعه شهری، تعدیل ساختار صنعتی و کارایی کاربری زمین
- مبلغ: ۹۱,۰۰۰ تومان
Abstract
In the present research, the removal of lead(II) and copper(II) from aqueous solutions is studied, using SnO2 nanowires as new adsorbent on solid-phase extraction disk and compared with pine core and buttonwood as biosorbents. Batch adsorption experiments were performed as a function of pH, adsorption time, solute concentration and adsorbent dose for biosorbents. Also, the pH, transfer rate of solution and metal concentration were selected as experimental parameters for the removal of heavy metals by SnO2 nanowires. All of the parameters were optimized by experimental design method for sorbents. The experimental equilibrium adsorption data are tested for the Langmuir and Freundlich equations. Results indicate the following order to fit the isotherms: Langmuir[Freundlich, in case of lead and copper ions. The removal of Cu(II) and Pb(II) was performed by selected sorbents in the presence of interferences ions. This led to no remarkable decrease in the removal efficiency of SnO2 nanowires. Using the SnO2 nanowires in the wastewater treatment indicated 96.8 and 85.28% removal efficiency in only 7 min for Pb(II) and Cu(II), respectively. SnO2 nanowires were found as reusable sorbent. Therefore, SnO2 nanowires have a good potential for application in environmental protection.
Conclusion
A rapid hydrothermal method was used for the synthesis of SnO2 nanowires. The high aspect ratio was achieved by controlling ammonia and tin chloride concentration. The removal efficiency of SNW-SPE was compared with pine core and buttonwood as biosorbents. The results show higher removal efficiency of SNW-SPE than biosorbents. The advantages of SNW-SPE are low interference with other metal ions in the removal efficiency, reusability, ultrafast removal and high surface area. The adsorption behaviors of heavy metal ions onto the SNW-SPE, pine core and buttonwood match well with Langmuir isotherms. Using the SNW-SPE as adsorbent, economical wastewater treatment without SNW leakage into water is feasible. The SNW is promising materials for pre-concentration and solidification of heavy metal ions from large volumes of solutions.