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. 

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. 

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. 

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, 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. 

sarah nadira hurairah, nur syaza mohamad fahimi, azhar abdul halim, marlia mohd hanafiah, nurulhana nordin, nurul ain ab jalil, zawawi daud.  (2023).  archidendron jiringa seed peel extract in the removal of lead from synthetic residual water using coagulation-flocculation process.  - scienceasia.  94-100. 

amir detho, zawawi daud, abdulaziz ibrahim almohan, sattam fahad almojil, abdulrhman fahmi alali, asif ali memon, saleem raza samo, mohd arif roslid, halizah awang, mohd baharudin ridzuan, mohamad anuar kamaruddin, azhar abdul halim.  (2022).  adsorption efficiency and isotherm of cod and nh3 removal from stabilized leachate using natural low-cost adsorbent green mussel (perna viridis).  - desalination and water treatment.  191-201. 

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. 

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. 

sarah nadira hurairah, nur syaza mohamad fahimi, azhar abdul halim, marlia mohd hanafiah, nurulhana nordin, nurul ain ab jalil, zawawi daud.  (2023).  archidendron jiringa seed peel extract in the removal of lead from synthetic residual water using coagulation-flocculation process.  - scienceasia.  94-100. 

amir detho, zawawi daud, abdulaziz ibrahim almohan, sattam fahad almojil, abdulrhman fahmi alali, asif ali memon, saleem raza samo, mohd arif roslid, halizah awang, mohd baharudin ridzuan, mohamad anuar kamaruddin, azhar abdul halim.  (2022).  adsorption efficiency and isotherm of cod and nh3 removal from stabilized leachate using natural low-cost adsorbent green mussel (perna viridis).  - desalination and water treatment.  191-201. 

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. 

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. 

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. 

n abdul harris, a abdul halim.  (2021).  microbial fuel cells constructed from the integration of anaerobic and aerobic sanitary landfill site systems.  - 4th international conference on science and technology application in clime change 2021.  012-034. 

sarah nadira hurairah, azhar abdul halim, nurhazirah abdul aziz.  (2021).  stabilized leachate treatment by using a combination of struvite precipitation and coagulation-flocculation methods: rsm optimization.  - international conference on civil and environmental engineering.  1-13. 

mohan kumar manikam, azhar abdul halim, marlia mohd hanafiah.  (2019).  pollutants removal from sewage wastewater using palm oil fuel ash.  - the 2018 ukm fst postgraduate colloquium , aip conference proceeding.  1-7. 

devagi subramaniam, azhar abdul halim.  (2014).  effect of electrochemical oxidation on biodegradability and toxicity of batik industry wastewater.  - aip conference proceeding - the 2014 ukm fst postgraduate colloquium.  597-602. 

abdul fattah abu bakar & azhar abdul halim.  (2013).  poly-aluminum chloride, ferric chloride, aluminum sulfate.  - aip conference proceeding : the 2013 ukm fst postgraduate colloquium.  524-529. 

khai ern lee, ramli abdullah, marlia mohd hanafiah, azhar abdul halim, mazlin mokhtar, choo ta goh & lubna alam.  (2018).  environmental risk analysis for asian-oriented, risk-based watershed management : japan and malaysia.  - .  8. 

lee khai ern, mazlin mokhtar, marlia mohd hanafiah, azhar abdul halim.  (2021).  bahan kimia dalam kehidupan harian: adakah kita selamat?.  - .  19. 

siti hafizan hassan, azhar abdul halim.  (2019).  advanced oxidation processes (aops) in water and wastewater treatment.  - .  16. 

nur amirah ahmad asmadi, azhar abdul halim.  (2018).  siri penyelidikan sains sekitaran & sumber alam 2018.  - .  4. 

khai ern lee, ramli abdullah, marlia mohd hanafiah, azhar abdul halim, mazlin mokhtar, choo ta goh & lubna alam.  (2018).  environmental risk analysis for asian-oriented, risk-based watershed management : japan and malaysia.  - .  8. 

nor syafiqah shaharuddin, mohan kumar manikam, azhar abdul halim.  (2018).  siri penyelidikan sains sekitaran dan sumber alam 2018.  - .  6. 

azhar abdul halim, marlia mohd hanafiah, farah diyana ariffin, hajah nor aidah nordin, kumutha ap krishnamoorthy.  (2022).  fitoremediasi - kssm biologi tingkatan 5.  - .  46. 

fathul karim sahrani, haja maideen kader maideen, azhar abdul halim, muhammad ashahadi dzulka.  (2018).  siri penyelidikan sains sekitaran dan sumber alam 2018.  - .  437. 

loong chuen lee, yaishnavee ravi, nor azman mohd noor, saiful fazamil mohd ali, hukil sino, azhar abdul halim.  (2021).  performances of derivative algorithms in uplc chromatograms of red soils.  - 4th analytical chemistry and separation sciences virtual event.  1. 

loong chuen lee, nor azman mohd noor, saiful fazamil mohd ali, hukil sino, azhar abdul halim.  (2021).  ultra-performance liquid chromatography (uplc) method for forensic soil profiling.  - tokyo international conference.  7. 

loong chuen lee, hukil sino, nor azman mohd noor, saiful mohd ali, azhar abdul halim.  (2021).  predicting source of brown soils from proximity locations using random forests for forensic investigation.  - 12th international fundamental science congress (ifsc) 2021.  1-12. 

marlia binti mohd hanafiah;mohd. ekhwan bin toriman;azhar bin abdul halim;othman bin jaafar.  (2021).  establishing water efficiency toolkit using water footprint as a key indicator to assess performance of water utilities: inculcating the concept of kampus lestari, ukm.  - .  . 

loong chuen lee, hukil sino, nor azman mohd noor, saiful mohd ali and azhar abdul halim.  (2021).  prediction of the geographical origin of soils using ultra-performance liquid chromatography (uplc) fingerprinting and k-nearest neighbor (k-nn).  - 2nd international conference on artificial intelligence: advances and applications (icaiaa 2021).  1-12.