Amir Detho, Zawawi Dauda, Mohd Arif Rosli, Mohd Baharudin Bin Ridzuan, Halizah Awang, Mohamad Anuar Kamaruddin, Husnul Azan Bin Tajarudin, Azhar Abdul Halim.  (2021).  COD and ammoniacal nitrogen reduction from stabilized landfill leachate using carbon mineral composite adsorbent.  - Desalination and Water Treatment.  143-151. 

M.M. Hanafiah, N.I.H.A. Aziz, A.A. Halim, L.S. Shamdin, L.A.A. Razzak.  (2021).  Phytoremediation of landfill leachate using Ipomoea aquatica and Pistia stratiotes.  - Journal of Environmental Biology.  775-781. 

Zawawi Daud, Amir Detho, Mohd Arif Rosli, Mahmoud Hijab Abubakar, Kamran Ahmed Samo, Nur Faizan Mohammad Rais, Azhar Abdul Halim, Husnul Azan Tajarudin.  (2020).  Ammoniacal nitrogen and COD removal from stabilized landfill leachate using granular activated carbon and green mussel (Perna viridis) shell powder as a composite adsorbent.  - Desalination and Water Treatment.  111-117. 

Zawawi Daud, Amir Detho, Mohd Arif Rosli, Mahmoud Hijab Abubakar, Kamran Ahmed Samo, Nur Faizan Mohammad Rais, Azhar Abdul Halim, Husnul Azan Tajarudin.  (2020).  Ammoniacal nitrogen and COD removal from stabilized landfill leachate usinggranular activated carbon and green mussel (Perna viridis) shell powder as acomposite adsorbent.  - Desalination and Water Treatment.  111-117. 

Farah Diyana Ariffin, Azhar Abdul Halim, Marlia Mohd Hanafiah, Nor Azira Ramlee.  (2019).  Kebolehupayaan fitoremediasi oleh azolla pinnata dalam merawat air sisa akuakultur.  - Sains Malaysiana.  281-289. 

Farah Diyana Ariffin, Azhar Abdul Halim, Marlia Mohd Hanafiah, Normah Awang, Mohd Sham Othman, Azman, S. A. A., Bakri, N. S. M.  (2019).  The effects of African Catfish, clarias gariepinus pond farms effluent on water quality Of Kesang River in Malacca, Malaysia.  - Applied Ecology and Environmental Research.  1531-1545. 

Mohan Kumar Manikam, Maizatul Intan Syafinaz, Azhar Abdul Halim, Marlia Mohd Hanafiah.  (2019).  Penyingkiran Ammonia dan Permintaan Oksigen Kimia daripada Air Sisa Kumbahan menggunakan Media Penjerap Komposit Karbon Teraktif.  - Sains Malaysiana.  2529-2939. 

Mohan Kumar Manikam, Azhar Abdul Halim, Marlia M. Hanafiah, Renga Rao Krishnamoorthy.  (2019).  Removal of ammonia nitrogen, nitrate, phosphorus and COD from sewage wastewater using palm oil boiler ash composite adsorbent.  - Desalination and Water Treatment.  23-30. 

Nazlizan Nasir, Zawawi Daud, Aeslina Abd Kadir, Ab Aziz Abdul Latiff, Baharin Ahmad, Noorain Suhani, Halizah Awang, Adeleke Abdulrahman Oyekanmi, Azhar Abdul Halim.  (2019).  Removal of ammonia nitrogen from rubber industry wastewater using zeolite as adsorbent.  - Malaysian Journal of Fundamental and Applied Sciences.  862-866. 

Muzzneena Ahmad Mustapha, Azhar Abdul Halim, Mohd Rozi Umor.  (2019).  Bridging issue in addressing the agenda for sustainable development.  - Sains Malaysiana.  2297-2604. 

Zawawi Daud, Mahmoud Hijab Abubakar, Aeslina Abdul Kadir, Abdul Aziz Abdul Latiff, Halizah Awang, Azhar Abdul Halim, Aminaton Marto.  (2017).  Adsorption studies of leachate on cockle shells.  - International Journal of Geomate.  46-52. 

Mohd Arif Rosli, Zawawi Daud, Ab Aziz Abdul Latiff, Shahril Effendi A Rahman, Adeleke Abdulrahman Oyekanmi, Adnan Zainorabidin, Halizah Awang, Azhar Abdul Halim.  (2017).  The effectiveness of peat-AC composite adsorbent in removing color and fe from landfill leachate.  - International Journal of Integrated Engineering.  35-38. 

Azhar Abdul Halim, Marlia Mohd Hanafiah, Khairi, A.  (2017).  Ammonia Removal from Sewage Wastewater Using Chemically Modified Sand.  - Applied Ecology and Environmental Research.  521-528. 

Marlia Mohd Hanafiah, Mohamed Yasreen Mohamed Ali, Nur Izzah Hamna Abdul Aziz, Muhammad Aqeel Ashraf, Azhar Abdul Halim, Lee, Khai Ern, Idris, Mushrifah.  (2017).  Biogas Production From Goat and Chicken Manure in Malaysia.  - Applied Ecology and Environmental Research.  . 

Nur Syarina Asman, Azhar Abdul Halim, Marlia Mohd Hanafiah & Farah Diyana Ariffin.  (2017).  Penentuan kualiti air daripada sistem penuaian air hujan di Kolej Ungku Omar, UKM Bangi.  - Sains Malaysiana.  1211-1219. 

Zawawi Daud, Nazlizan Nasir , Aeslina Abd Kadir, Ab Aziz Abdul Latiff, Baharin Ahmad, Noorain Suhani, Halizah Awang, Azhar Abdul Halim.  (2017).  Treatment of biodiesel wastewater using ferric chloride and ferric sulfate.  - International Journal of Integrated Engineering.  54-57. 

Fawaz Al-Badaii, Azhar Abdul Halim & Mohammad Shuhaimi-Othman.  (2016).  Evaluation of Dissolved Heavy Metals in Water of the Sungai Semenyih (Peninsular Malaysia) using Environmetric Methods.  - Sains Malaysiana.  841-852. 

Abdul Fattah Abu Bakar, Siti Nathasa Md Barkawi, Marlia Mohd. Hanafiah, Lee Khai Ern & Azhar Abdul Halim.  (2016).  Penyingkiran ammonia dan logam berat dari air sisa industri automotif menggunakan pasir terubahsuai secara kimia.  - Sains Malaysiana.  1509 - 1516. 

Azhar Abdul Halim, Nor Alia Roslan, Nor Shamsiah Yaacub & Mohd. Talib Latif.  (2013).  Boron Removal from Aqueous Solution Using Curcumin-impregnated Activated Carbon.  - Sains Malaysiana.  42(9):1293-1300. 

A. A. Halim, Mohd. Firhad Ahmad.  (2013).  Isoterma dan Kinetik Penjerapan Boron oleh Batu Kapur Sebagai Penjerap Berkos Rendah.  - Sains Malaysiana.  42(12):1689-1696. 

Azhar Abdul Halim, Hamidi Abdul Aziz, Megat Azmi Megat Johari,Kamar Shah Ariffin and Mohammed J.K. Bashir.  (2012).  Semi-Aerobic landfill leachate treatment using carbon minerals composite adsorbent.  - Environmental Engineering Science.  29(5):306-312. 

Nor Hasleda Mamat @ Alias, Azhar Abdul Halim, Muhammad Ikram A Wahab.  (2011).  Penyingkiran Boron dari Larutan Akuas Menggunakan Penjerap Komposit Berasaskan Karbon-Mineral.  - Sains Malaysiana.  40(11):1271-1276. 

Awang Normah, Kamaludin Nurul Farahana, Barnard Ester, Hamid Asmah, Norfadilah Rajab and Azhar Abdul Halim.  (2011).  Cytotoxic and Genotoxic Effect of Triphenyltin(IV) Benzylisopropyldithiocarbamate in Thymoma Murine Cell Line (WEHI 7.2).  - Research Journal of Chemistry and Environment.  15(2):544-549. 

Alias, N.H.M., Halim, A.A., Wahab, M.I.A..  (2011).  Penyingkiran boron daripada larutan akuas menggunakan penjerap komposit berasaskan karbon-mineral.  - Sains Malaysiana.  40(11):1271-1276.