تجاوز إلى المحتوى الرئيسي
User Image

Dr. Munir Ahmad

Assistant Professor

Assistant Professor/Researcher

كلية علوم الأغذية والزراعة
Office No. 85-A, Building 2, Soil Science Department, College of Food and Agricultural Sciences, King Saud University Riyad, Saudi Arabia
المنشورات
مقال فى مجلة
2019

Engineered biochar composites with zeolite, silica, and nano-zerovalent iron for the efficient scavenging of chlortetracycline from aqueous solutions

Al-Wabel, Munir Ahmad, Adel RA Usman, Muhammad Imran Rafique, Mohammad I . 2019

Date palm waste–derived biochar (DBC) was produced through pyrolysis (600 °C) and modified with zeolite (Z-DBC), silica (S-DBC), or nano-zerovalent iron (nZVI-DBC) to design efficient sorbents. The pristine and engineered biochars were characterized by SEM, XRD, BET, TGA, CHNS-O, and FTIR to investigate the surface, structural, and mineralogical composition. The nZVI-DBC exhibited lowest pH (6.15) and highest surface area (220.92 m2 g−1), carbon (80.55%), nitrogen (3.78%), and hydrogen (11.09%) contents compared with other biochars. Isotherm sorption data for chlortetracycline (CTC) removal from aqueous solutions was described well by Langmuir and Redlich–Peterson isotherms showing the highest fitness (R2values in the range of 0.88–0.98 and 0.88–0.99, respectively). Langmuir predicted maximum CTC adsorption capacity was in order of nZVI-DBC (89.05 mg g−1) > S-DBC (45.57 mg g−1) > Z-DBC (30.42 mg g−1) > DBC (28.19 mg g−1). Kinetics adsorption data was best described by power function model (R2 = 0.93–0.99), followed by interaparticle diffusion (R2 = 0.85–0.96) model. The nZVI-DBC performed outclass by removing 98% of CTC, followed by S-DBC (68%), Z-DBC (35%), and DBC (36%). Chemisorption, H-bonding, and interaparticle diffusion were the operating mechanisms for CTC adsorption onto DBC, S-DBC, and Z-DBC, while π-π electron donor–accepter interactions and redox reactions augmented these mechanisms for highest CTC adsorption onto nZVI-DBC. Therefore, nZVI-DBC may serve as an efficient green technology for the removal of CTC from aqueous solutions and to reduce surface date palm waste pollution.

مزيد من المنشورات
publications

Elevated levels of doxycycline (DC) have been detected in the environment due to its extensive utilization as a veterinary antibiotic. Sorption–desorption behavior of DC in soil affects its…

بواسطة Mohammad I Al-Wabel, Munir Ahmad, Hamed A Al-Swadi, Jahangir Ahmad, Yassir Abdin, Adel RA Usman, Abdullah SF Al-Farraj
2021
publications

Application of manure and compost can result in the accumulation of veterinary antibiotics in soil, subsequently posing ecological risks.

بواسطة Mohammad I Al-Wabel, Munir Ahmad, Jahangir Ahmad, Nahrir MA Lubis, Adel RA Usman, Abdullah SF Al-Farraj
2021
publications

Healthy soils ensure food security through sustainable agricultural production and also support in mitigating the climate change hazardous like global warming and greenhouse gases emission.

بواسطة Muhammad Rashid, Qaiser Hussain, Khalid Saifullah Khan, Mohammad I Alwabel, Munir Ahmad, Sarosh Alvi, Muhammad Riaz, Song Xiongyun, Abdul Manaf, Muhammad Azeem, Saqib Bashir
2019