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خالد بن محمد بن ناصر الدعجاني
Bio
التعريف الشخصي:
أستاذ مساعد في تخصص الكيمياء التحليلية درست الماجستير في جامعة لفبرة والدكتوراه في جامعة ستراثكلايد - بريطانيا في مجال تحضير مواد متناهية الصغر (نانويه) وتطبيقها في المعالجات البيئية وحاليا اشغل منصب وكيل معهد الملك عبدالله لتقنية النانوا.
I completed my Bachelor degree in Chemistry from King Saud University, Riyadh, Saudi Arabia, in 2007. In 2010, I have completed my master degree in analytical chemistry from University of loughborough , United kingdom. I received my Ph.D degree in Nanotechnology from the University of strathclyde, UK , in 2015. In 2015,I became Assistant Professor at the Department of Chemistry, College of Science, King Saud University. I'm currently the Deputy Dean for Research Affairs at King Abdullah Institute for Nanotechnology. My research interests is designing and developing novel materials at the nanoscale level for on-demand application technologies, mainly those that can address current problems in the field of healthcare, environment, and energy.
أستاذ مساعد في تخصص الكيمياء التحليلية درست الماجستير في جامعة لفبرة والدكتوراه في جامعة ستراثكلايد - بريطانيا في مجال تحضير مواد متناهية الصغر (نانويه) وتطبيقها في المعالجات البيئية وحاليا اشغل منصب وكيل معهد الملك عبدالله لتقنية النانوا.
I completed my Bachelor degree in Chemistry from King Saud University, Riyadh, Saudi Arabia, in 2007. In 2010, I have completed my master degree in analytical chemistry from University of loughborough , United kingdom. I received my Ph.D degree in Nanotechnology from the University of strathclyde, UK , in 2015. In 2015,I became Assistant Professor at the Department of Chemistry, College of Science, King Saud University. I'm currently the Deputy Dean for Research Affairs at King Abdullah Institute for Nanotechnology. My research interests is designing and developing novel materials at the nanoscale level for on-demand application technologies, mainly those that can address current problems in the field of healthcare, environment, and energy.
CV Text
المشاريع البحثية المدعومة التي تم الحصول عليها :
- الباحث الرئيسي في مشروع مدعوم من مدينة الملك عبدالعزيز للعلوم والتقنية في عام ٢٠١٧ لمدة سنة واحدة وكان بعنوان ( A principle investigator (PI) in a grant from king Abdelaziz city for science and technology in 2017 for one year titled with development of a colorimetric biosensor using gold nanoparticles and a DNA aptamer for the detection of vitamin D.)
- الباحث الرئيسي في مشروع مدعوم من هيئة المواصفات والمقاييس في عام ٢٠٢١ .
PARTICIPATION IN FUNDED RESEARCH PROGRAMS
- A principle investigator (PI) in a grant from king Abdelaziz city for science and technology in 2017 for one year titled with development of a colorimetric biosensor using gold nanoparticles and a DNA aptamer for the detection of vitamin D.
- A principle investigator (PI) in a grant from Saudi Standards, Metrology and Quality Organization 2021 titled with Determination of potentially toxic elements and volatile organic compounds in commercial paint samples used in residential buildings.
المؤتمرات ( CONFERENCES):
· Sensing in Water Conference, Royal society of chemistry, held in Nottingham Belfry Hotel, Nottingham, 21st September 2011.
· The 6th Saudi Scientific International Conference, that was held in London, 11 October 2012.
· 12th International Conference on Materials Chemistry (MC12), Royal society of chemistry, that was held in York, 22 July 2015.
Qualifications
University
جامعة الملك سعود
جامعة لفبرة
ستراثكلايد
From Date
To Date
Specialization
كيمياء عامه
كيمياء تحليليه
كيمياء تحليلية
Degree
بكالريوس
ماجستير
دكتوراة
Experiences
Affiliation
معهد الملك عبدالله لتقنية النانوا
From Date
Position Title
وكيل معهد الملك عبدالله لتقنية النانوا للشؤون البحثية
Seminars
Seminar Title
المؤتمر العلمي الدولي السعودي السادس
المؤتمر السنوي السابع في البيئة والتقنيه النظيفه
Seminar Date
Seminar Period
3
4
Research Projects
Research Title
Investigation Into the formation of Multi- Metal Ligand Complexes at high pH
Preconcentration and selective extraction of chromium species in water samples using amino modified mesoporous silica
Adsorption kinetic study: Effect of adsorbent pore size distribution on the rate of Cr (VI) uptake
From Date
To Date
Membership Type
باحث
Researcher
Researcher
About Research
The effect of increasing concentrations of the organic chelating agents EDTA, DTPA and Citrate ( at concentration ranging from 0.005 M and 0.1 M ) on the solubility of Nickel in 95% saturated calcium hydroxide solutions have been investigated as well as the possibility of the formation of Multi-Metal ligand complexes [Ca-Ni-Ligand] by study the effects of increasing concentrations of the calcium hydroxide on the solubility of Nickel in presence of fixed concentrations of the organic ligands in saturated sodium hydroxide . The experiments were carried out in isolated N2 atmosphere in a glove box at a high pH. results show that in increasing concentrations of the organic ligands saturated with 95% Calcium hydroxide, The solubility of Ni (II) increased as the concentration of the organic ligand increased. In increasing concentrations of calcium hydroxide and a fixed concentration of the organic ligands, the solubility of Ni (II) was slightly affected when EDTA and DTPA were present, whereas in the presence of citrate the solubility was highly affected due to the change in calcium concentration, and there was a rapid increase in the solubility of Ni (II) . When the concentration of calcium hydroxide was increased in saturated sodium hydroxide without the present of the organic ligands, the solubility decreased.
Speciation and separation of chromium (VI) and chromium (III) from aqueous solutions were investigated using amino-propyl functionalised mesoporous silica (AP-MCM-41) as an adsorbent. The as-synthesised adsorbent was produced following a simple synthesis method at room temperature prior to template removal using microwave digestion. The maximum adsorption capacity at 111.1 mg/g was calculated according to the Langmuir isotherm model, suggesting a 1:1 monolayer adsorption mechanism. More- over, AP is a simple chelate, yet it can extract Cr (VI) exclusively from solutions containing other mixed metal ions simply by tuning the solution pH. Recovery of Cr (VI) from loaded sorbents is equally easy to perform with 100% extraction efficiencies allowing reuse of the sorbent and recovery of Cr (VI) from aqueous solutions containing a complex mixture of ions. The material would find use in environmental remediation applications, as a selective adsorbent of Cr (VI) or even as a solid-phase extraction stationary phase to remove and pre-concentrate Cr (VI) from aqueous solutions; this study demonstrates enrichment factors of 100 although higher levels are also possible.
Adsorbents were synthesized to obtain novel silica nanoparticles with a broad pore-size distribution (herein referred to as USG-41). The material demonstrated fast adsorption rates with highest adsorption capacities following Langmuir adsorption. Kinetic data best fit the intraparticle diffusion model demon- strating a two-step, surface and pore, adsorption process with pore diffusion being the rate determining step. This data provides key evidence of internal pore chelation of dichromate ions by USG-41. In contrast silica adsorbents (SBA-15 and MCM-41) prepared with similar average pore sizes to USG-41, but with narrow pore-size distributions, had lower adsorption capacities and their kinetic date best fit pseudo-sec- ond order diffusion models indicating a one-step, surface only, adsorption process. This study clearly demonstrated that pores size distribution, not the surface area or the average pore size, was central to ensure optimum adsorbent performance for removal of Cr (VI) from contaminated water.
Languages
Language
English
Level
Excellent