nurul umairah m. nizam, marlia m. hanafiah, ebrahim mahmoudi, azhar a. halim, abdul wahab mohammad.  (2021).  the removal of anionic and cationic dyes from an aqueous solution using biomass-based activated carbon.  - scientific reports.  1-17. 

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. 

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. 

a.a. halim, m.m. hanafiah, m. asmi, z. daud.  (2021).  boron removal from aqueous solution using coagulationflocculation with curcumin : a response surface methodology.  - journal of environmental biology.  750-755. 

marlia m. hanafiah, muhamad f. zainuddin, nurul u. m. nizam, azhar halim, akhtar rasool.  (2020).  phytoremediation of aluminium and iron from industrial wastewater using ipomoea aquatica and centella asiatica.  - applied sciences.  1-13. 

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. 

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. 

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. 

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. 

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. 

muzzneena ahmad mustapha, azhar abdul halim, mohd rozi umor.  (2019).  bridging issue in addressing the agenda for sustainable development.  - sains malaysiana.  2297-2604. 

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. 

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. 

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. 

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. 

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. 

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.  . 

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. 

khai ern lee, mazlin mokhtar, marlia mohd hanafiah, azhar abdul halim, jamaludin badusah.  (2016).  rainwater harvesting as an alternative water resource in malaysia: potential, policies and development.  - journal of cleaner production.  218-222. 

zawawi daud, mahmoud hijab abubakar, aeslina abdul kadir, ab aziz abdul latiff, halizah awang, azhar abdul halim, aminaton marto.  (2016).  optimization of leachate treatment with granular biomedia: feldspar and zeolite.  - indian journal of science and technology.  1-5. 

devagi subramaniam, azhar a. halim, marlia m. hanafiah.  (2016).  performance of electrochemical oxidation in treating textile industry wastewater by graphite electrode.  - nature environment & pollution technology.  1021-1026. 

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, azhar abdul halim, marlia mohd hanafiah.  (2015).  optimization of coagulation-flocculation process for automotive wastewater treatment using response surface methodology.  - nature environment and pollution technology.  567-572. 

azhar abdul halim, kee ke han, marlia mohd hanafiah.  (2015).  removal of methylene blue from dye wastewater using river sand by adsorption.  - nature environment and pollution technology.  89-94. 

anuar ithnin, muhammad shakirin, nurhudayanti mohd yusof, shamrul aizam abd. rahman and azhar abdul halim.  (2015).  study on air quality and influences on human respiratory health among residents who occupy building at former landfill site.  - nature environment and technology.  385-390. 

anuar ithnin, mira azilah ibrahim, che radziah che md. zain and azhar abdul halim.  (2015).  isolation and characterization of encoded formaldehyde responsive gene from dieffenbachia compacta.  - nature environment and pollution technology.  435-438. 

anuar ithnin, nadiah yahya and azhar abdul halim.  (2014).  effect of dust level towards working comfort among employees in train depot.  - world applied sciences journal.  29(8):994-999. 

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, 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. 

azhar abdul halim, mohd talib latif and anuar ithnin.  (2013).  ammonia removal from aqueous solution using organic acid modified activated carbon.  - world applied sciences journal.  24(1):1-6. 

azhar abd halim, abdul fattah abu bakar, megat ahmad kamal megat hanafiah and haslizaidi zakaria.  (2012).  boron removal from aqueous solutions using curcumin-aided electrocoagulation.  - middle-east journal of scientific research.  11(5):583-588. 

fatma omran m. alahmr, murnira othman, nurul bahiyah abd wahid, azhar abdul halim, mohd talib latif.  (2012).  compositions of dust fall around semi-urban areas in malaysia.  - aerosol and air quality research.  12(4):629-642. 

azhar abdul halim, nur hanani thaldiri, normah awang and mohd talib latif.  (2012).  removing boron from an aqueous solution using turmeric extract-aided coagulation-flocculation.  - american journal of environmental sciences.  8(3):322-327. 

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. 

azhar abdul halim, noor nazurah zainal abidin, normah awang, anuar ithnin, mohd. sham othman, mohd. ikram wahab.  (2011).  ammonia and cod removal from synthetic leachate using rice husk composite adsorbent.  - journal of urban and environmental engineering (juee).  5(1):24-31. 

azhar abdul halim, eliani ezani, mohd. sham othman, normah awang, m. ikram, a. ithnin.  (2011).  adsorption study of aluminium onto curcuma longa.  - australian journal of basic and applied sciences.  5(5):1170-1177. 

muhammad ikram, amornpon changsuphan, nguyen thi kim oanh and azhar abdul halim.  (2011).  potential use of a combine ozone and uv over zeolite coated with zno nanoparticles for gases benzene elimination.  - australian journal of basic and applied sciences.  5(5): 191-200. 

azhar abdul halim, farahdilla abu bakar, nazurah zainal abidin, normah awang, m. ikram wahab, anuar ithnin.  (2011).  effect of the acidic food flavors and turmeric towards aluminium leachability.  - australian journal of basic and applied sciences.  5(9): 597-601. 

normah awang, ibrahim baba, bohari m yamin, mohd sham othman and azhar abdul halim.  (2011).  synthesis, characterization and crystal structure of triphenyltin (iv) n-alkyl-n-cyclohexyldithiocarbamate compounds.  - world applied sciences journal.  12(5):630-635. 

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. 

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. 

anuar ithnin, radiah abu hasan shaari, mazrura sahani, anuar mohd mokhtar, azhar abdul halim, normah awang.  (2011).  effects of pollutant diesel fuels on neurobehavioral performance among workers in locomotive depot.  - american journal of environmental sciences.  7(3):248-253. 

azhar abdul halim, hamidi abdul aziz, megat azmi megat johari, kamar shah ariffin, mohd. nordin adlan.  (2010).  ammoniacal nitrogen and cod removal from semi-aerobic landfill leachate using a composite adsorbent : fixed bed column adsorption performance.  - journal of hazardous materials.  175(1-3):960-964. 

azhar abdul halim, hamidi abdul aziz, megat azmi megat johari, kamar shah ariffin.  (2010).  comparison study of ammonia and cod adsorption on zeolite, activated carbon and composite materials in landfill leachate treatment.  - desalination.  article in press. 

azhar abdul halim, hamidi abdul aziz, megat azmi megat johari, kamar shah ariffin and yung-tse hung.  (2009).  removal of ammoniacal nitrogen and cod from semi-aerobic landfill leachate using low-cost activated carbon-zeolite composite adsorbent.  - international journal of environment and waste management.  4(3-4):399-411.